add(example): WIP popup Element example implementation

Negative paddings use the current size to calculate the padding from
the opposite orientation. For a given dimension (horizontal or vertical)
if the size is `30` a padding of `5` would be equivalent to a padding
of `-25`. This enables to describe the size of the container using
the padding property of the `Layout` and gives users more freedom to
describe different layouts.

.gitea/workflows/release.yaml

@@ -15,7 +15,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
       - name: Setup zig installation
-        uses: mlugg/setup-zig@v1
+        uses: mlugg/setup-zig@v2
         with:
           version: master
       - name: Run tests

.gitea/workflows/test.yaml

@@ -14,11 +14,11 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
       - name: Setup zig installation
-        uses: mlugg/setup-zig@v1
+        uses: mlugg/setup-zig@v2
         with:
           version: master
       - name: Lint check
-        run: zig fmt --check .
+        run: zig fmt --check --exclude src/test .
       - name: Spell checking
         uses: crate-ci/typos@v1.25.0
         with:

README.md

@@ -1,9 +1,22 @@
-# zterm Terminal User Interface Library
+# zterm TUI Library
 
-`zterm` is a terminal user interface library to implement terminal (fullscreen or inline) applications.
+`zterm` is a terminal user interface library (*tui*) to implement terminal (fullscreen or inline) applications.
 
-> [!NOTE]
+> [!CAUTION]
-> Only builds using the master version are tested to work.
+> Only builds using the zig master version are tested to work.
+
+## Demo
+
+Clone this repository and run `zig build --help` to see the available examples. Run a given example as follows:
+
+```sh
+zig build --release=safe -Dexample=demo run
+```
+
+> [!TIP]
+> Every example application can be quit using `ctrl+c`.
+
+See the [wiki](https://gitea.yves-biener.de/yves-biener/zterm/wiki) for a showcase of the examples and the further details.
 
 ## Usage
 
@@ -13,7 +26,7 @@ To add or update `zterm` as a dependency in your project run the following comma
 zig fetch --save git+https://gitea.yves-biener.de/yves-biener/zterm
 ```
 
-Add the dependency to your module as follows in your _build.zig_:
+Add the dependency to your module as follows in your *build.zig*:
 
 ```zig
 const zterm: *Dependency = b.dependency("zterm", .{
@@ -24,156 +37,10 @@ const zterm: *Dependency = b.dependency("zterm", .{
 exe.root_module.addImport("zterm", zterm.module("zterm"));
 ```
 
-For an example you can take a look at [build.zig](build.zig) for an example.
+### Documentation
 
----
+A wiki should be created containing a bright overview of the structure and usage
-## Design Goals
+of the library. For details it should refer to the examples. The documentation
-
+should be minimal in terms of updateability in case the library changes. Maybe
-This project draws heavy inspiration from
+some documentation could be derived from the code documentation (there is a tool
-[clay](https://github.com/nicbarker/clay) in the way the layout is declared by
+for this if I recall correctly).
-the user. As terminal applications usually are rendered in intermediate mode,
-the rendering is also part of the event loop. Such that every time an event
-happens a render call will usually be done as well. However this is not strickly
-necessary and can be separated to have a fixed rendering of every 16ms (i.e. for
-60 fps), etc.
-
-There is only one generic container which contains properties and elements (or
-children) which can also be containers, such that each layout in the end is
-a tree.
-
-The library is designed to be very basic and not to provide any more complex
-elements such as input fields, drop-down menu's, buttons, etc. Some of them are
-either easy to implement yourself, specific for you needs or a too complex to
-be provided by the library effectively. For these use-cases there may be other
-libraries that build on top of this one to provide the complex elements as some
-sort of pre-built elements for you to use in your application (or you create
-them yourself).
-
-There are only very few system events, that are used by the built-in containers
-and properties accordingly. For you own widgets (i.e. a collection of elements)
-you can extend the events to include your own events to communicate between
-elements, effect the control flow and the corresponding generated layouts and
-much more.
-
-As this is a terminal based layout library it also provides a rendering pipeline
-alongside the event loop implementation. Usually the event loop is waiting
-blocking and will only cause a re-draw (**intermediate mode**) after each event.
-Even though the each frame is regenerated from scratch each render loop, the
-corresponding application is still pretty performant as the renderer uses a
-double buffered intermediate mode implementation to only apply the changes from
-each frame to the next to the terminal.
-
-This library is also designed to work accordingly in ssh hosted environments,
-such that an application created using this library can be accessed directly
-via ssh. This provides security through the ssh protocol and can defer the
-synchronization process, as users may access the same running instance. Which is
-the primary use-case for myself to create this library in the first place.
-
----
-## Roadmap
-
-- [ ] Container rendering
-  - [x] Layout
-    - [x] direction
-      - [x] vertical
-      - [x] horizontal
-    - [x] padding
-    - [x] gap
-    - [x] sizing (removed - for now at least)
-      - width
-      - height
-      - options
-        - fit
-        - grow
-        - fixed
-        - percent
-  - [x] Border
-    - [x] sides
-    - [x] corners
-    - [x] separators
-  - [x] Rectangle
-  - [ ] User control
-    - [x] event handling
-    - [x] user content
-    - [ ] Default `Element` implementations
-      - [ ] Scrollable
-        - [ ] user input handling
-          - [ ] vertical
-          - [ ] horizontal
-        - [ ] scroll bar(s) rendering
-          - [ ] vertical
-          - [ ] horizontal
-      - [ ] Content alignment (i.e. standard calculations done with the provided `Size`)
-      - [ ] Text display
-      - [ ] User input
-        - [ ] single line
-        - [ ] multi line
-      - [ ] min size? (I don't have access to the `.resize` `Event`..)
-
-Decorations should respect the layout and the viewport accordingly. This means
-that scrollbars are always visible (except there is no need to have a scrollbar)
-irrelevant depending on the size of the content. The rectangle apply to all
-cells of the content (and may be overwritten by child elements contents).
-The border of an element should be around independent of the scrolling of the
-contents, just like padding.
-
-### Scrollable contents
-
-Contents that is scrollable should be done *virtually* through the contents of
-the `Container`. This means each container contents implements scrolling for
-itself if required.
-
-This still has one issue: Layout of child elements that are already too large
-(i.e. or become too small). The library could provide automatic rendering of a
-scrollbar given the right parameters however. The scrolling input action would
-then also be implemented by the user.
-
-Open questions are regarding the sizing options (i.e. how is the size of a
-`Container` actually controlled?, how should it be controlled?, etc.). There
-should be support for the child elements to provide some kind of 'list'
-functionality built-in.
-
-**REMINDER**: (mostly for myself) The library should be and remain simple. This
-means that some code for using the library may be duplicated, but this is not
-the main goal. Others may provide more re-usable code snippets that build on top
-of this library instead.
-
-### User specific event handling and content rendering
-
-For interactions controlled by the user each container can use an `Element`
-interface which contains functions which are called by the `Container`
-during event handling (i.e. `fn handle(..)`) and during rendering (i.e. `fn
-content(..)`) to provide user specific content and user interaction. The
-`Element` may be stateful, but may also be stateless and then be re-used in
-multiple different `Container`s.
-
-Composing multiple `Element`s currently requires the implementation of a wrapper
-which contains the `Element`s that need to be handled (should work pretty well
-for stateless `Element`s). Such *stateless* `Element`s may be provided by this
-library.
-
-### Input
-
-How is the user input handled in the containers? Should there be active
-containers? Some input may happen for a specific container (i.e. when using
-mouse input). How would I handle scrolling for outer and inner elements of
-a container?
-
-### Archive
-
-The alignment and sizing options only make sense if both are available. For
-this the current implementation has the viewport size and the content size too
-linked. Therefore they have both been removed (at least for now):
-
-  - *fit*:   adjust virtual space of container by the size of its children (i.e. a
-             container needs to be able to get the necessary size of its children)
-  - *grow*:  use as much space as available (what exactly would be the difference
-             between this option and *fit*?)
-  - *fixed*: use exactly as much cells (in the specified direction)
-
-  - *center*: elements should have their anchor be placed accordingly to their
-              size and the viewport size.
-  - *left*:   the anchor remains at zero (relative to the location of the
-              container on the screen) -> similar to the current implementation!
-  - *right*:  the anchor is fixed to the right side (i.e. size of the contents -
-              size of the viewport)

build.zig

@@ -1,9 +1,40 @@
-const std = @import("std");
-
 pub fn build(b: *std.Build) void {
     const target = b.standardTargetOptions(.{});
     const optimize = b.standardOptimizeOption(.{});
 
+    const Examples = enum {
+        all,
+        demo,
+        continuous,
+        // elements:
+        alignment,
+        button,
+        input,
+        popup,
+        progress,
+        scrollable,
+        // layouts:
+        vertical,
+        horizontal,
+        grid,
+        mixed,
+        // styles:
+        text,
+        palette,
+        // error handling
+        errors,
+    };
+
+    const example = b.option(Examples, "example", "Example to build and/or run. (default: all)") orelse .all;
+    const debug_rendering = b.option(bool, "debug", "Enable debug rendering. Highlight origin's, size's, padding's, gap's, etc. (default: false)") orelse false;
+    // NOTE do not support debug rendering in release builds
+    if (debug_rendering == true and optimize != .Debug) @panic("Cannot enable debug rendering in non-debug builds.");
+
+    const options = b.addOptions();
+    options.addOption(bool, "debug", debug_rendering);
+    const options_module = options.createModule();
+
+    // dependencies
     const zg = b.dependency("zg", .{
         .target = target,
         .optimize = optimize,
@@ -11,56 +42,64 @@ pub fn build(b: *std.Build) void {
 
     // library
     const lib = b.addModule("zterm", .{
-        .root_source_file = b.path("src/zterm.zig"),
+        .root_source_file = b.path("src/root.zig"),
         .target = target,
         .optimize = optimize,
     });
     lib.addImport("code_point", zg.module("code_point"));
+    lib.addImport("build_options", options_module);
 
-    // main executable (usually used for testing)
+    //--- Examples ---
-    const exe = b.addExecutable(.{
+    const examples = std.meta.fields(Examples);
-        .name = "zterm",
+    inline for (examples) |e| {
-        .root_source_file = b.path("src/main.zig"),
+        if (@as(Examples, @enumFromInt(e.value)) == .all) continue; // skip `.all` entry
+        const demo = b.addExecutable(.{
+            .name = e.name,
+            .root_source_file = b.path(switch (@as(Examples, @enumFromInt(e.value))) {
+                .demo => "examples/demo.zig",
+                .continuous => "examples/continuous.zig",
+                // elements:
+                .alignment => "examples/elements/alignment.zig",
+                .button => "examples/elements/button.zig",
+                .input => "examples/elements/input.zig",
+                .popup => "examples/elements/popup.zig",
+                .progress => "examples/elements/progress.zig",
+                .scrollable => "examples/elements/scrollable.zig",
+                // layouts:
+                .vertical => "examples/layouts/vertical.zig",
+                .horizontal => "examples/layouts/horizontal.zig",
+                .grid => "examples/layouts/grid.zig",
+                .mixed => "examples/layouts/mixed.zig",
+                // styles:
+                .text => "examples/styles/text.zig",
+                .palette => "examples/styles/palette.zig",
+                // error handling
+                .errors => "examples/errors.zig",
+                .all => unreachable, // should never happen
+            }),
             .target = target,
             .optimize = optimize,
         });
-    exe.root_module.addImport("zterm", lib);
+        // import dependencies
-
+        demo.root_module.addImport("zterm", lib);
-    // TODO: add example execution through optional argument to `zig run` to run
+        // mapping of user selected example to compile step
-    // an example application instead of the main executable
+        if (@intFromEnum(example) == e.value or example == .all) b.installArtifact(demo);
-
+    }
-    // example applications (usually used for documentation and demonstrations)
-    const container = b.addExecutable(.{
-        .name = "container",
-        .root_source_file = b.path("examples/container.zig"),
-        .target = target,
-        .optimize = optimize,
-    });
-    container.root_module.addImport("zterm", lib);
-    b.installArtifact(container);
-
-    // zig build run
-    const run_cmd = b.addRunArtifact(exe);
-    run_cmd.step.dependOn(b.getInstallStep());
-    // Allow additional arguments, like this: `zig build run -- arg1 arg2 etc`
-    if (b.args) |args| run_cmd.addArgs(args);
-
-    // This creates a build step. It will be visible in the `zig build --help` menu,
-    // and can be selected like this: `zig build run`
-    // This will evaluate the `run` step rather than the default, which is "install".
-    const run_step = b.step("run", "Run the app");
-    run_step.dependOn(&run_cmd.step);
 
     // zig build test
     const lib_unit_tests = b.addTest(.{
-        .root_source_file = b.path("src/zterm.zig"),
+        .root_source_file = b.path("src/root.zig"),
         .target = target,
         .optimize = optimize,
     });
     lib_unit_tests.root_module.addImport("code_point", zg.module("code_point"));
+    lib_unit_tests.root_module.addImport("DisplayWidth", zg.module("DisplayWidth"));
+    lib_unit_tests.root_module.addImport("build_options", options_module);
 
     const run_lib_unit_tests = b.addRunArtifact(lib_unit_tests);
 
     const test_step = b.step("test", "Run unit tests");
     test_step.dependOn(&run_lib_unit_tests.step);
 }
+
+const std = @import("std");

build.zig.zon

@@ -6,16 +6,29 @@
     //
     // It is redundant to include "zig" in this name because it is already
     // within the Zig package namespace.
-    .name = "zterm",
+    .name = .zterm,
+
+    // Together with name, this represents a globally unique package
+    // identifier. This field is generated by the Zig toolchain when the
+    // package is first created, and then *never changes*. This allows
+    // unambiguous detection of one package being an updated version of
+    // another.
+    //
+    // When forking a Zig project, this id should be regenerated (delete the
+    // field and run `zig build`) if the upstream project is still maintained.
+    // Otherwise, the fork is *hostile*, attempting to take control over the
+    // original project's identity. Thus it is recommended to leave the comment
+    // on the following line intact, so that it shows up in code reviews that
+    // modify the field.
+    .fingerprint = 0xf10b37e210a619d7, // Changing this has security and trust implications.
 
     // This is a [Semantic Version](https://semver.org/).
     // In a future version of Zig it will be used for package deduplication.
-    .version = "0.0.0",
+    .version = "0.3.0",
 
-    // This field is optional.
+    // Tracks the earliest Zig version that the package considers to be a
-    // This is currently advisory only; Zig does not yet do anything
+    // supported use case.
-    // with this value.
+    .minimum_zig_version = "0.15.0-dev.56+d0911786c",
-    //.minimum_zig_version = "0.11.0",
 
     // This field is optional.
     // Each dependency must either provide a `url` and `hash`, or a `path`.
@@ -24,16 +37,14 @@
     // internet connectivity.
     .dependencies = .{
         .zg = .{
-            .url = "git+https://codeberg.org/atman/zg#4a002763419a34d61dcbb1f415821b83b9bf8ddc",
+            .url = "git+https://codeberg.org/atman/zg#9427a9e53aaa29ee071f4dcb35b809a699d75aa9",
-            .hash = "1220f3e29bc40856bfc06e0ee133f814b0011c76de987d8a6a458c2f34d82708899a",
+            .hash = "zg-0.14.1-oGqU3IQ_tALZIiBN026_NTaPJqU-Upm8P_C7QED2Rzm8",
         },
     },
     .paths = .{
+        "LICENSE",
         "build.zig",
         "build.zig.zon",
         "src",
-        // For example...
-        //"LICENSE",
-        //"README.md",
     },
 }

examples/container.zig

@@ -1,152 +0,0 @@
-const std = @import("std");
-const zterm = @import("zterm");
-
-const App = zterm.App(union(enum) {});
-const Key = zterm.Key;
-
-const log = std.log.scoped(.example);
-
-pub const ExampleElement = packed struct {
-    pub fn element(this: *@This()) App.Element {
-        return .{
-            .ptr = this,
-            .vtable = &.{
-                .handle = handle,
-                .content = content,
-            },
-        };
-    }
-
-    // example function to render contents for a `Container`
-    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Size) !void {
-        _ = ctx;
-        std.debug.assert(cells.len == @as(usize, size.cols) * @as(usize, size.rows));
-
-        // NOTE: error should only be returned here in case an in-recoverable exception has occurred
-        const row = size.rows / 2;
-        const col = size.cols / 2 -| 3;
-
-        for (0..5) |c| {
-            cells[(row * size.cols) + col + c].style.fg = .black;
-            cells[(row * size.cols) + col + c].cp = '-';
-        }
-    }
-
-    // example function to handle events for a `Container`
-    fn handle(ctx: *anyopaque, event: App.Event) !void {
-        _ = ctx;
-        switch (event) {
-            .init => log.debug(".init event", .{}),
-            else => {},
-        }
-    }
-};
-
-pub fn main() !void {
-    errdefer |err| log.err("Application Error: {any}", .{err});
-
-    // TODO: maybe create own allocator as some sort of arena allocator to have consistent memory usage
-    var gpa: std.heap.GeneralPurposeAllocator(.{}) = .init;
-    defer {
-        const deinit_status = gpa.deinit();
-        if (deinit_status == .leak) {
-            log.err("memory leak", .{});
-        }
-    }
-    const allocator = gpa.allocator();
-
-    var app: App = .init;
-    var renderer = zterm.Renderer.Buffered.init(allocator);
-    defer renderer.deinit();
-
-    var element_wrapper = ExampleElement{};
-    const element = element_wrapper.element();
-
-    var container = try App.Container.init(allocator, .{
-        .border = .{
-            .separator = .{
-                .enabled = true,
-                .line = .double,
-            },
-        },
-        .layout = .{
-            .gap = 2,
-            .padding = .all(5),
-            .direction = .vertical,
-        },
-    }, element);
-    var box = try App.Container.init(allocator, .{
-        .rectangle = .{ .fill = .blue },
-        .layout = .{
-            .gap = 1,
-            .direction = .vertical,
-            .padding = .vertical(1),
-        },
-    }, .{});
-    try box.append(try App.Container.init(allocator, .{
-        .rectangle = .{ .fill = .light_green },
-    }, element));
-    try box.append(try App.Container.init(allocator, .{
-        .rectangle = .{ .fill = .light_green },
-    }, .{}));
-    try box.append(try App.Container.init(allocator, .{
-        .rectangle = .{ .fill = .light_green },
-    }, element));
-    try container.append(box);
-    try container.append(try App.Container.init(allocator, .{
-        .border = .{
-            .color = .light_blue,
-            .sides = .vertical,
-        },
-    }, .{}));
-    try container.append(try App.Container.init(allocator, .{
-        .rectangle = .{ .fill = .blue },
-    }, .{}));
-    defer container.deinit(); // also de-initializes the children
-
-    try app.start();
-    defer app.stop() catch |err| log.err("Failed to stop application: {any}", .{err});
-
-    // event loop
-    while (true) {
-        const event = app.nextEvent();
-        log.debug("received event: {s}", .{@tagName(event)});
-
-        switch (event) {
-            .init => {
-                try container.handle(event);
-                continue; // do not render
-            },
-            .quit => break,
-            .resize => |size| try renderer.resize(size),
-            .key => |key| {
-                if (key.matches(.{ .cp = 'q' })) app.quit();
-
-                if (key.matches(.{ .cp = 'n', .mod = .{ .ctrl = true } })) {
-                    try app.interrupt();
-                    defer app.start() catch @panic("could not start app event loop");
-                    var child = std.process.Child.init(&.{"hx"}, allocator);
-                    _ = child.spawnAndWait() catch |err| app.postEvent(.{
-                        .err = .{
-                            .err = err,
-                            .msg = "Spawning $EDITOR failed",
-                        },
-                    });
-                }
-            },
-            // NOTE: errors could be displayed in another container in case one was received, etc. to provide the user with feedback
-            .err => |err| log.err("Received {s} with message: {s}", .{ @errorName(err.err), err.msg }),
-            else => {},
-        }
-
-        // NOTE: returned errors should be propagated back to the application
-        container.handle(event) catch |err| app.postEvent(.{
-            .err = .{
-                .err = err,
-                .msg = "Container Event handling failed",
-            },
-        });
-        try renderer.render(@TypeOf(container), &container);
-        try renderer.flush();
-    }
-}

examples/continuous.zig

@@ -0,0 +1,245 @@
+const QuitText = struct {
+    const text = "Press ctrl+c to quit.";
+
+    pub fn element(this: *@This()) App.Element {
+        return .{ .ptr = this, .vtable = &.{ .content = content } };
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        _ = ctx;
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        const row = 2;
+        const col = size.x / 2 -| (text.len / 2);
+        const anchor = (row * size.x) + col;
+
+        for (text, 0..) |cp, idx| {
+            cells[anchor + idx].style.fg = .white;
+            cells[anchor + idx].style.bg = .black;
+            cells[anchor + idx].cp = cp;
+
+            // NOTE do not write over the contents of this `Container`'s `Size`
+            if (anchor + idx == cells.len - 1) break;
+        }
+    }
+};
+
+/// Spinner element implementation that runs a simple animation that requires
+/// the continuous draw loop.
+const Spinner = struct {
+    counter: u8 = 0,
+    index: u8 = 0,
+
+    const map: [6]u21 = .{ '𜺎', '𜺍', '𜺇', '𜹯', '𜹿', '𜺋' };
+
+    pub fn element(this: *@This()) App.Element {
+        return .{
+            .ptr = this,
+            .vtable = &.{
+                .content = content,
+            },
+        };
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        const this: *@This() = @ptrCast(@alignCast(ctx));
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        cells[size.x + 1].cp = map[this.index];
+
+        this.counter += 1;
+        if (this.counter >= 20) {
+            this.index += 1;
+            this.index %= 6;
+            this.counter = 0;
+        }
+    }
+};
+
+const InputField = struct {
+    input: std.ArrayList(u21),
+    queue: *App.Queue,
+
+    pub fn init(allocator: std.mem.Allocator, queue: *App.Queue) @This() {
+        return .{
+            .input = .init(allocator),
+            .queue = queue,
+        };
+    }
+
+    pub fn deinit(this: @This()) void {
+        this.input.deinit();
+    }
+
+    pub fn element(this: *@This()) App.Element {
+        return .{
+            .ptr = this,
+            .vtable = &.{
+                .handle = handle,
+                .content = content,
+            },
+        };
+    }
+
+    fn handle(ctx: *anyopaque, event: App.Event) !void {
+        const this: *@This() = @ptrCast(@alignCast(ctx));
+        switch (event) {
+            .key => |key| {
+                if (key.isAscii()) try this.input.append(key.cp);
+
+                if (key.eql(.{ .cp = zterm.input.Enter }) or key.eql(.{ .cp = zterm.input.KpEnter }))
+                    this.queue.push(.{ .accept = try this.input.toOwnedSlice() });
+
+                if (key.eql(.{ .cp = zterm.input.Backspace }))
+                    _ = this.input.pop();
+
+                if (key.eql(.{ .cp = zterm.input.Delete }) or key.eql(.{ .cp = zterm.input.KpDelete }))
+                    _ = this.input.pop();
+            },
+            else => {},
+        }
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        const this: *@This() = @ptrCast(@alignCast(ctx));
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        if (this.input.items.len == 0) return;
+
+        const row = 1;
+        const col = 1;
+        const anchor = (row * size.x) + col;
+
+        for (this.input.items, 0..) |cp, idx| {
+            cells[anchor + idx].style.fg = .black;
+            cells[anchor + idx].style.cursor = false;
+            cells[anchor + idx].cp = cp;
+
+            // NOTE do not write over the contents of this `Container`'s `Size`
+            if (anchor + idx == cells.len - 1) break;
+
+            if (idx == this.input.items.len - 1) cells[anchor + idx + 1].style.cursor = true;
+        }
+    }
+};
+
+pub fn main() !void {
+    errdefer |err| log.err("Application Error: {any}", .{err});
+
+    var gpa: std.heap.DebugAllocator(.{}) = .init;
+    defer if (gpa.deinit() == .leak) log.err("memory leak", .{});
+
+    const allocator = gpa.allocator();
+
+    var app: App = .init;
+    var renderer = zterm.Renderer.Buffered.init(allocator);
+    defer renderer.deinit();
+
+    var input_field: InputField = .init(allocator, &app.queue);
+    defer input_field.deinit();
+
+    var quit_text: QuitText = .{};
+    var spinner: Spinner = .{};
+
+    var container = try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .grey },
+        .layout = .{
+            .direction = .vertical,
+            .padding = .all(5),
+        },
+    }, quit_text.element());
+    defer container.deinit();
+
+    try container.append(try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .light_grey },
+        .size = .{
+            .grow = .horizontal,
+            .dim = .{ .y = 10 },
+        },
+    }, input_field.element()));
+
+    const nested_container: App.Container = try .init(allocator, .{
+        .rectangle = .{ .fill = .light_grey },
+    }, spinner.element());
+    try container.append(nested_container);
+
+    try app.start();
+    defer app.stop() catch |err| log.err("Failed to stop application: {any}", .{err});
+
+    var framerate: u64 = 60;
+    var tick_ms: u64 = @divFloor(time.ms_per_s, framerate);
+    var next_frame_ms: u64 = 0;
+
+    // draw loop
+    draw: while (true) {
+        const now_ms: u64 = @intCast(time.milliTimestamp());
+        if (now_ms >= next_frame_ms) {
+            next_frame_ms = now_ms + tick_ms;
+        } else {
+            time.sleep((next_frame_ms - now_ms) * time.ns_per_ms);
+            next_frame_ms += tick_ms;
+        }
+
+        const len = blk: {
+            app.queue.lock();
+            defer app.queue.unlock();
+            break :blk app.queue.len();
+        };
+
+        // handle events
+        for (0..len) |_| {
+            const event = app.queue.drain() orelse break;
+            log.debug("handling event: {s}", .{@tagName(event)});
+            // pre event handling
+            switch (event) {
+                .key => |key| {
+                    log.debug("key {any}", .{key});
+                    if (key.eql(.{ .cp = 'c', .mod = .{ .ctrl = true } })) app.quit();
+                },
+                .accept => |input| {
+                    defer allocator.free(input);
+                    var string = try allocator.alloc(u8, input.len);
+                    defer allocator.free(string);
+                    for (0.., input) |i, char| string[i] = @intCast(char);
+                    log.debug("Accepted input '{s}'", .{string});
+                },
+                .err => |err| log.err("Received {s} with message: {s}", .{ @errorName(err.err), err.msg }),
+                .focus => |b| {
+                    // NOTE reduce framerate in case the window is not focused and restore again when focused
+                    framerate = if (b) 60 else 15;
+                    tick_ms = @divFloor(time.ms_per_s, framerate);
+                },
+                else => {},
+            }
+
+            container.handle(event) catch |err| app.postEvent(.{
+                .err = .{
+                    .err = err,
+                    .msg = "Container Event handling failed",
+                },
+            });
+
+            // post event handling
+            switch (event) {
+                .quit => break :draw,
+                else => {},
+            }
+        }
+
+        container.resize(try renderer.resize());
+        container.reposition(.{});
+        try renderer.render(@TypeOf(container), &container);
+        try renderer.flush();
+    }
+}
+
+pub const panic = App.panic_handler;
+const log = std.log.scoped(.default);
+
+const std = @import("std");
+const time = std.time;
+const assert = std.debug.assert;
+const zterm = @import("zterm");
+const App = zterm.App(union(enum) {
+    accept: []u21,
+});

examples/demo.zig

@@ -0,0 +1,198 @@
+const QuitText = struct {
+    const text = "Press ctrl+c to quit. Press ctrl+n to launch helix.";
+
+    pub fn element(this: *@This()) App.Element {
+        return .{ .ptr = this, .vtable = &.{ .content = content } };
+    }
+
+    pub fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        _ = ctx;
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        const y = 2;
+        const x = size.x / 2 -| (text.len / 2);
+        const anchor = (y * size.x) + x;
+
+        for (text, 0..) |cp, idx| {
+            cells[anchor + idx].style.fg = .white;
+            cells[anchor + idx].style.bg = .black;
+            cells[anchor + idx].cp = cp;
+
+            // NOTE do not write over the contents of this `Container`'s `Size`
+            if (anchor + idx == cells.len - 1) break;
+        }
+    }
+};
+
+pub fn main() !void {
+    errdefer |err| log.err("Application Error: {any}", .{err});
+
+    // TODO maybe create own allocator as some sort of arena allocator to have consistent memory usage
+    var gpa: std.heap.DebugAllocator(.{}) = .init;
+    defer if (gpa.deinit() == .leak) log.err("memory leak", .{});
+
+    const allocator = gpa.allocator();
+
+    var app: App = .init;
+    var renderer = zterm.Renderer.Buffered.init(allocator);
+    defer renderer.deinit();
+
+    var quit_text: QuitText = .{};
+
+    // TODO what should the demo application do?
+    // - some sort of chat? -> write messages and have them displayed in a scrollable array at the right hand side?
+    // - on the left some buttons?
+    var box = try App.Container.init(allocator, .{
+        .border = .{
+            .color = .blue,
+            .sides = .all,
+        },
+        .layout = .{
+            .gap = 1,
+            .padding = .vertical(2),
+            .direction = .vertical,
+        },
+        .size = .{
+            .dim = .{ .y = 90 },
+        },
+    }, .{});
+    try box.append(try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .light_green },
+    }, .{}));
+    try box.append(try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .light_green },
+    }, .{}));
+    try box.append(try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .light_green },
+    }, .{}));
+    defer box.deinit();
+
+    var scrollable: App.Scrollable = .init(box, .disabled);
+
+    var container = try App.Container.init(allocator, .{
+        .layout = .{
+            .gap = 2,
+            .separator = .{ .enabled = true },
+            .padding = .{ .top = 5, .bottom = 3, .left = 3, .right = 3 },
+            .direction = .horizontal,
+        },
+    }, quit_text.element());
+    try container.append(try App.Container.init(allocator, .{}, scrollable.element()));
+
+    var nested_container: App.Container = try .init(allocator, .{
+        .layout = .{
+            .direction = .vertical,
+            .separator = .{
+                .enabled = true,
+            },
+        },
+    }, .{});
+    var inner_container: App.Container = try .init(allocator, .{
+        .layout = .{
+            .direction = .vertical,
+        },
+        .border = .{
+            .color = .light_blue,
+            .sides = .all,
+        },
+    }, .{});
+    try inner_container.append(try .init(allocator, .{
+        .rectangle = .{
+            .fill = .blue,
+        },
+        .size = .{
+            .grow = .horizontal,
+            .dim = .{ .y = 5 },
+        },
+    }, .{}));
+    try inner_container.append(try .init(allocator, .{
+        .rectangle = .{
+            .fill = .red,
+        },
+        .size = .{
+            .grow = .horizontal,
+            .dim = .{ .y = 5 },
+        },
+    }, .{}));
+    try inner_container.append(try .init(allocator, .{
+        .rectangle = .{
+            .fill = .green,
+        },
+    }, .{}));
+    try nested_container.append(inner_container);
+    try nested_container.append(try .init(allocator, .{
+        .size = .{
+            .grow = .horizontal,
+            .dim = .{ .y = 1 },
+        },
+    }, .{}));
+    try container.append(nested_container);
+    try container.append(try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .blue },
+        .size = .{
+            .dim = .{ .x = 30 },
+        },
+    }, .{}));
+    defer container.deinit(); // also de-initializes the children
+
+    try app.start();
+    defer app.stop() catch |err| log.err("Failed to stop application: {any}", .{err});
+
+    // event loop
+    while (true) {
+        const event = app.nextEvent();
+        log.debug("received event: {s}", .{@tagName(event)});
+
+        // pre event handling
+        switch (event) {
+            .key => |key| {
+                if (key.eql(.{ .cp = 'c', .mod = .{ .ctrl = true } })) app.quit();
+
+                if (key.eql(.{ .cp = 'n', .mod = .{ .ctrl = true } })) {
+                    try app.interrupt();
+                    renderer.size = .{}; // reset size, such that next resize will cause a full re-draw!
+                    defer app.start() catch @panic("could not start app event loop");
+                    var child = std.process.Child.init(&.{"hx"}, allocator);
+                    _ = child.spawnAndWait() catch |err| app.postEvent(.{
+                        .err = .{
+                            .err = err,
+                            .msg = "Spawning $EDITOR failed",
+                        },
+                    });
+                    continue;
+                }
+            },
+            // NOTE errors could be displayed in another container in case one was received, etc. to provide the user with feedback
+            .err => |err| log.err("Received {s} with message: {s}", .{ @errorName(err.err), err.msg }),
+            else => {},
+        }
+
+        // NOTE returned errors should be propagated back to the application
+        container.handle(event) catch |err| app.postEvent(.{
+            .err = .{
+                .err = err,
+                .msg = "Container Event handling failed",
+            },
+        });
+
+        // post event handling
+        switch (event) {
+            .quit => break,
+            else => {},
+        }
+
+        container.resize(try renderer.resize());
+        container.reposition(.{});
+        try renderer.render(@TypeOf(container), &container);
+        try renderer.flush();
+    }
+}
+
+pub const panic = App.panic_handler;
+const log = std.log.scoped(.default);
+
+const std = @import("std");
+const assert = std.debug.assert;
+const zterm = @import("zterm");
+const input = zterm.input;
+const App = zterm.App(union(enum) {});

examples/elements/alignment.zig

@@ -0,0 +1,99 @@
+const QuitText = struct {
+    const text = "Press ctrl+c to quit.";
+
+    pub fn element(this: *@This()) App.Element {
+        return .{ .ptr = this, .vtable = &.{ .content = content } };
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        _ = ctx;
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        const row = 2;
+        const col = size.x / 2 -| (text.len / 2);
+        const anchor = (row * size.x) + col;
+
+        for (text, 0..) |cp, idx| {
+            cells[anchor + idx].style.fg = .white;
+            cells[anchor + idx].style.bg = .black;
+            cells[anchor + idx].cp = cp;
+
+            // NOTE do not write over the contents of this `Container`'s `Size`
+            if (anchor + idx == cells.len - 1) break;
+        }
+    }
+};
+
+pub fn main() !void {
+    errdefer |err| log.err("Application Error: {any}", .{err});
+
+    var gpa: std.heap.DebugAllocator(.{}) = .init;
+    defer if (gpa.deinit() == .leak) log.err("memory leak", .{});
+
+    const allocator = gpa.allocator();
+
+    var app: App = .init;
+    var renderer = zterm.Renderer.Buffered.init(allocator);
+    defer renderer.deinit();
+
+    var container: App.Container = try .init(allocator, .{}, .{});
+    defer container.deinit();
+
+    var quit_text: QuitText = .{};
+    const quit_container = try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .blue },
+        .layout = .{
+            .direction = .vertical,
+            .padding = .all(5),
+        },
+        .size = .{
+            .dim = .{ .x = 25, .y = 5 },
+            .grow = .fixed,
+        },
+    }, quit_text.element());
+
+    var alignment: App.Alignment = .init(quit_container, .center);
+    try container.append(try .init(allocator, .{}, alignment.element()));
+
+    try app.start();
+    defer app.stop() catch |err| log.err("Failed to stop application: {any}", .{err});
+
+    // event loop
+    while (true) {
+        const event = app.nextEvent();
+        log.debug("received event: {s}", .{@tagName(event)});
+
+        // pre event handling
+        switch (event) {
+            .key => |key| if (key.eql(.{ .cp = 'c', .mod = .{ .ctrl = true } })) app.quit(),
+            .err => |err| log.err("Received {s} with message: {s}", .{ @errorName(err.err), err.msg }),
+            else => {},
+        }
+
+        container.handle(event) catch |err| app.postEvent(.{
+            .err = .{
+                .err = err,
+                .msg = "Container Event handling failed",
+            },
+        });
+
+        // post event handling
+        switch (event) {
+            .quit => break,
+            else => {},
+        }
+
+        container.resize(try renderer.resize());
+        container.reposition(.{});
+        try renderer.render(@TypeOf(container), &container);
+        try renderer.flush();
+    }
+}
+
+pub const panic = App.panic_handler;
+const log = std.log.scoped(.default);
+
+const std = @import("std");
+const assert = std.debug.assert;
+const zterm = @import("zterm");
+const App = zterm.App(union(enum) {});

examples/elements/button.zig

@@ -0,0 +1,151 @@
+const QuitText = struct {
+    const text = "Press ctrl+c to quit.";
+
+    pub fn element(this: *@This()) App.Element {
+        return .{ .ptr = this, .vtable = &.{ .content = content } };
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        _ = ctx;
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        const row = 2;
+        const col = size.x / 2 -| (text.len / 2);
+        const anchor = (row * size.x) + col;
+
+        for (text, 0..) |cp, idx| {
+            cells[anchor + idx].style.fg = .white;
+            cells[anchor + idx].style.bg = .black;
+            cells[anchor + idx].cp = cp;
+
+            // NOTE do not write over the contents of this `Container`'s `Size`
+            if (anchor + idx == cells.len - 1) break;
+        }
+    }
+};
+
+const Clickable = struct {
+    const text = "Press me";
+
+    queue: *App.Queue,
+    color: zterm.Color = .black,
+
+    pub fn element(this: *@This()) App.Element {
+        return .{
+            .ptr = this,
+            .vtable = &.{
+                .handle = handle,
+                .content = content,
+            },
+        };
+    }
+
+    fn handle(ctx: *anyopaque, event: App.Event) !void {
+        const this: *@This() = @ptrCast(@alignCast(ctx));
+        switch (event) {
+            .mouse => |mouse| if (mouse.button == .left and mouse.kind == .release) {
+                var value = @intFromEnum(this.color);
+                value += 1;
+                value %= 17;
+                if (value == 0) value = 1;
+                this.color = @enumFromInt(value);
+                this.queue.push(.{ .click = @tagName(mouse.button) });
+            },
+            else => {},
+        }
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        const this: *@This() = @ptrCast(@alignCast(ctx));
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        const row = size.y / 2 -| (text.len / 2);
+        const col = size.x / 2 -| (text.len / 2);
+        const anchor = (row * size.x) + col;
+
+        for (text, 0..) |cp, idx| {
+            cells[anchor + idx].style.fg = this.color;
+            cells[anchor + idx].style.emphasis = &.{.bold};
+            cells[anchor + idx].cp = cp;
+
+            // NOTE do not write over the contents of this `Container`'s `Size`
+            if (anchor + idx == cells.len - 1) break;
+        }
+    }
+};
+
+pub fn main() !void {
+    errdefer |err| log.err("Application Error: {any}", .{err});
+
+    var gpa: std.heap.DebugAllocator(.{}) = .init;
+    defer if (gpa.deinit() == .leak) log.err("memory leak", .{});
+
+    const allocator = gpa.allocator();
+
+    var app: App = .init;
+    var renderer = zterm.Renderer.Buffered.init(allocator);
+    defer renderer.deinit();
+
+    var clickable: Clickable = .{ .queue = &app.queue };
+    const element = clickable.element();
+
+    var button: App.Button(.accept) = .init(&app.queue, .init(.default, "Button"));
+
+    var quit_text: QuitText = .{};
+
+    var container = try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .grey },
+        .layout = .{ .padding = .all(5) },
+    }, quit_text.element());
+    defer container.deinit();
+
+    try container.append(try App.Container.init(allocator, .{ .rectangle = .{ .fill = .light_grey } }, element));
+    try container.append(try App.Container.init(allocator, .{ .rectangle = .{ .fill = .black } }, button.element()));
+
+    try app.start();
+    defer app.stop() catch |err| log.err("Failed to stop application: {any}", .{err});
+
+    // event loop
+    while (true) {
+        const event = app.nextEvent();
+        log.debug("received event: {s}", .{@tagName(event)});
+
+        // pre event handling
+        switch (event) {
+            .key => |key| if (key.eql(.{ .cp = 'c', .mod = .{ .ctrl = true } })) app.quit(),
+            .click => |b| log.info("Clicked with mouse using Button: {s}", .{b}),
+            .accept => log.info("Clicked built-in button using the mouse", .{}),
+            .err => |err| log.err("Received {s} with message: {s}", .{ @errorName(err.err), err.msg }),
+            else => {},
+        }
+
+        container.handle(event) catch |err| app.postEvent(.{
+            .err = .{
+                .err = err,
+                .msg = "Container Event handling failed",
+            },
+        });
+
+        // post event handling
+        switch (event) {
+            .quit => break,
+            else => {},
+        }
+
+        container.resize(try renderer.resize());
+        container.reposition(.{});
+        try renderer.render(@TypeOf(container), &container);
+        try renderer.flush();
+    }
+}
+
+pub const panic = App.panic_handler;
+const log = std.log.scoped(.default);
+
+const std = @import("std");
+const assert = std.debug.assert;
+const zterm = @import("zterm");
+const App = zterm.App(union(enum) {
+    click: [:0]const u8,
+    accept,
+});

examples/elements/input.zig

@@ -0,0 +1,166 @@
+const QuitText = struct {
+    const text = "Press ctrl+c to quit.";
+
+    pub fn element(this: *@This()) App.Element {
+        return .{ .ptr = this, .vtable = &.{ .content = content } };
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        _ = ctx;
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        const row = 2;
+        const col = size.x / 2 -| (text.len / 2);
+        const anchor = (row * size.x) + col;
+
+        for (text, 0..) |cp, idx| {
+            cells[anchor + idx].style.fg = .white;
+            cells[anchor + idx].style.bg = .black;
+            cells[anchor + idx].cp = cp;
+
+            // NOTE do not write over the contents of this `Container`'s `Size`
+            if (anchor + idx == cells.len - 1) break;
+        }
+    }
+};
+
+const MouseDraw = struct {
+    position: ?zterm.Point = null,
+
+    pub fn element(this: *@This()) App.Element {
+        return .{
+            .ptr = this,
+            .vtable = &.{
+                .handle = handle,
+                .content = content,
+            },
+        };
+    }
+
+    fn handle(ctx: *anyopaque, event: App.Event) !void {
+        const this: *@This() = @ptrCast(@alignCast(ctx));
+        switch (event) {
+            .mouse => |mouse| this.position = .{ .x = mouse.x, .y = mouse.y },
+            else => this.position = null,
+        }
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+        const this: *@This() = @ptrCast(@alignCast(ctx));
+
+        if (this.position) |pos| {
+            const idx = @as(usize, size.x) * @as(usize, pos.y) + @as(usize, pos.x);
+            cells[idx].cp = 'x';
+            cells[idx].style.fg = .red;
+        }
+    }
+};
+
+pub fn main() !void {
+    errdefer |err| log.err("Application Error: {any}", .{err});
+
+    var gpa: std.heap.DebugAllocator(.{}) = .init;
+    defer if (gpa.deinit() == .leak) log.err("memory leak", .{});
+
+    const allocator = gpa.allocator();
+
+    var app: App = .init;
+    var renderer = zterm.Renderer.Buffered.init(allocator);
+    defer renderer.deinit();
+
+    var input_field: App.Input(.accept) = .init(allocator, &app.queue, .init(.black));
+    defer input_field.deinit();
+
+    var mouse_draw: MouseDraw = .{};
+    var second_mouse_draw: MouseDraw = .{};
+    var quit_text: QuitText = .{};
+
+    var container = try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .grey },
+        .layout = .{
+            .direction = .vertical,
+            .padding = .all(5),
+        },
+    }, quit_text.element());
+    defer container.deinit();
+
+    try container.append(try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .light_grey },
+        .size = .{
+            .grow = .horizontal,
+            .dim = .{ .y = 1 },
+        },
+    }, input_field.element()));
+
+    var nested_container: App.Container = try .init(allocator, .{
+        .border = .{
+            .sides = .all,
+            .color = .black,
+        },
+        .rectangle = .{ .fill = .light_grey },
+        .layout = .{
+            .separator = .{
+                .enabled = true,
+                .color = .black,
+            },
+        },
+    }, .{});
+    try nested_container.append(try .init(allocator, .{
+        .rectangle = .{ .fill = .light_grey },
+    }, mouse_draw.element()));
+    try nested_container.append(try .init(allocator, .{
+        .rectangle = .{ .fill = .light_grey },
+    }, second_mouse_draw.element()));
+    try container.append(nested_container);
+
+    try app.start();
+    defer app.stop() catch |err| log.err("Failed to stop application: {any}", .{err});
+
+    // event loop
+    while (true) {
+        const event = app.nextEvent();
+        log.debug("received event: {s}", .{@tagName(event)});
+
+        // pre event handling
+        switch (event) {
+            .key => |key| if (key.eql(.{ .cp = 'c', .mod = .{ .ctrl = true } })) app.quit(),
+            .accept => |input| {
+                defer allocator.free(input);
+                log.debug("Accepted input '{s}'", .{input});
+            },
+            .err => |err| log.err("Received {s} with message: {s}", .{ @errorName(err.err), err.msg }),
+            else => {},
+        }
+
+        container.handle(event) catch |err| app.postEvent(.{
+            .err = .{
+                .err = err,
+                .msg = "Container Event handling failed",
+            },
+        });
+
+        // post event handling
+        switch (event) {
+            .quit => break,
+            else => {},
+        }
+
+        container.resize(try renderer.resize());
+        container.reposition(.{});
+        try renderer.render(@TypeOf(container), &container);
+        try renderer.flush();
+    }
+}
+
+pub const panic = App.panic_handler;
+const log = std.log.scoped(.default);
+
+const std = @import("std");
+const assert = std.debug.assert;
+const zterm = @import("zterm");
+const Color = zterm.Color;
+
+const App = zterm.App(union(enum) {
+    accept: []u8,
+});

examples/elements/popup.zig

@@ -0,0 +1,247 @@
+const QuitText = struct {
+    const text = "Press ctrl+c to quit.";
+
+    pub fn element(this: *@This()) App.Element {
+        return .{ .ptr = this, .vtable = &.{ .content = content } };
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        _ = ctx;
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        const row = 2;
+        const col = size.x / 2 -| (text.len / 2);
+        const anchor = (row * size.x) + col;
+
+        for (text, 0..) |cp, idx| {
+            cells[anchor + idx].style.fg = .white;
+            cells[anchor + idx].style.bg = .black;
+            cells[anchor + idx].cp = cp;
+
+            // NOTE do not write over the contents of this `Container`'s `Size`
+            if (anchor + idx == cells.len - 1) break;
+        }
+    }
+};
+
+const MouseDraw = struct {
+    position: ?zterm.Point = null,
+
+    pub fn element(this: *@This()) App.Element {
+        return .{
+            .ptr = this,
+            .vtable = &.{
+                .handle = handle,
+                .content = content,
+            },
+        };
+    }
+
+    fn handle(ctx: *anyopaque, event: App.Event) !void {
+        const this: *@This() = @ptrCast(@alignCast(ctx));
+        switch (event) {
+            .mouse => |mouse| this.position = .{ .x = mouse.x, .y = mouse.y },
+            else => this.position = null,
+        }
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+        const this: *@This() = @ptrCast(@alignCast(ctx));
+
+        if (this.position) |pos| {
+            const idx = @as(usize, size.x) * @as(usize, pos.y) + @as(usize, pos.x);
+            cells[idx].cp = 'x';
+            cells[idx].style.fg = .red;
+        }
+    }
+};
+
+const Popup = struct {
+    container: ?*App.Container = null,
+
+    pub fn element(this: *@This()) App.Element {
+        return .{
+            .ptr = this,
+            .vtable = &.{
+                .resize = resize,
+                .reposition = reposition,
+                .handle = handle,
+                .content = content,
+            },
+        };
+    }
+
+    fn resize(ctx: *anyopaque, size: zterm.Point) void {
+        const this: *@This() = @ptrCast(@alignCast(ctx));
+        if (this.container) |container| container.resize(size);
+    }
+
+    fn reposition(ctx: *anyopaque, _: zterm.Point) void {
+        const this: *@This() = @ptrCast(@alignCast(ctx));
+        if (this.container) |container| container.reposition(.{});
+    }
+
+    fn handle(ctx: *anyopaque, event: App.Event) !void {
+        const this: *@This() = @ptrCast(@alignCast(ctx));
+        switch (event) {
+            // TODO should the `Element` handle the pop_down element triggering (i.e. by defining a usual key for this?)
+            .pop_up => |optional| if (optional) |container| {
+                this.container = @ptrCast(@alignCast(container));
+            } else {
+                this.container = null;
+            },
+            else => if (this.container) |container| try container.handle(event),
+        }
+    }
+
+    fn render_container(container: App.Container, cells: []zterm.Cell, container_size: zterm.Point) !void {
+        const size = container.size;
+        const origin = container.origin;
+        const contents = try container.content();
+
+        const anchor = (@as(usize, origin.y) * @as(usize, container_size.x)) + @as(usize, origin.x);
+
+        var idx: usize = 0;
+        blk: for (0..size.y) |row| {
+            for (0..size.x) |col| {
+                cells[anchor + (row * container_size.x) + col] = contents[idx];
+                idx += 1;
+
+                if (contents.len == idx) break :blk;
+            }
+        }
+        // free immediately
+        container.allocator.free(contents);
+
+        for (container.elements.items) |child| try render_container(child, cells, size);
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        const this: *@This() = @ptrCast(@alignCast(ctx));
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        if (this.container) |container| {
+            assert(cells.len == @as(usize, container.size.x) * @as(usize, container.size.y));
+            const popup_cells = try container.content();
+
+            for (container.elements.items) |child| try render_container(child, popup_cells, size);
+
+            assert(cells.len == popup_cells.len);
+            @memcpy(cells, popup_cells);
+
+            container.allocator.free(popup_cells);
+        }
+    }
+};
+
+pub fn main() !void {
+    errdefer |err| log.err("Application Error: {any}", .{err});
+
+    var gpa: std.heap.DebugAllocator(.{}) = .init;
+    defer if (gpa.deinit() == .leak) log.err("memory leak", .{});
+
+    const allocator = gpa.allocator();
+
+    var app: App = .init;
+    var renderer = zterm.Renderer.Buffered.init(allocator);
+    defer renderer.deinit();
+
+    var popup: Popup = .{};
+    var quit_text: QuitText = .{};
+
+    // TODO
+    // - rendering of first Container contents will be overwritten by contents of the appended Container's (see the missing blue rectangle)
+    // - when rendering "nothing" it causes the below Container to be overwritten to "nothing" too!
+    // - not sure how this should be done?
+    //   - provide the pop-up with a  area where to draw? (i.e. somewhere to draw the provided `Container`)
+    //   - This however will not suffice as the contents will be overwritten!
+
+    var container = try App.Container.init(allocator, .{
+        .rectangle = .{
+            .fill = .blue,
+        },
+    }, .{});
+    defer container.deinit();
+
+    var popup_root_container = try App.Container.init(allocator, .{
+        .layout = .{
+            .padding = .{
+                .top = -17,
+                .left = -40,
+                .right = 5,
+                .bottom = 5,
+            },
+        },
+    }, .{});
+    try popup_root_container.append(try App.Container.init(allocator, .{}, popup.element()));
+
+    try container.append(try .init(allocator, .{}, quit_text.element()));
+    try container.append(popup_root_container); // FIXME it should not be appended (as it would become part of the layout)
+
+    var mouse: MouseDraw = .{};
+    var popup_container: App.Container = try .init(allocator, .{
+        .rectangle = .{ .fill = .green },
+        .layout = .{
+            .padding = .{
+                .top = -4,
+                .bottom = 1,
+                .left = 3,
+                .right = 3,
+            },
+        },
+    }, .{});
+    // showcase that inner `Container`s handle `Element`s accordingly
+    try popup_container.append(try .init(allocator, .{
+        .rectangle = .{ .fill = .grey },
+    }, mouse.element()));
+    defer popup_container.deinit();
+
+    try app.start();
+    defer app.stop() catch |err| log.err("Failed to stop application: {any}", .{err});
+
+    // event loop
+    while (true) {
+        const event = app.nextEvent();
+        log.debug("received event: {s}", .{@tagName(event)});
+
+        // pre event handling
+        switch (event) {
+            .key => |key| {
+                if (key.eql(.{ .cp = 'c', .mod = .{ .ctrl = true } })) app.quit();
+                if (key.eql(.{ .cp = zterm.input.Space })) app.postEvent(.{ .pop_up = &popup_container });
+                if (key.eql(.{ .cp = zterm.input.Escape })) app.postEvent(.{ .pop_up = null });
+            },
+            .err => |err| log.err("Received {s} with message: {s}", .{ @errorName(err.err), err.msg }),
+            else => {},
+        }
+
+        container.handle(event) catch |err| app.postEvent(.{
+            .err = .{
+                .err = err,
+                .msg = "Container Event handling failed",
+            },
+        });
+
+        // post event handling
+        switch (event) {
+            .quit => break,
+            else => {},
+        }
+
+        container.resize(try renderer.resize());
+        container.reposition(.{});
+        try renderer.render(@TypeOf(container), &container);
+        try renderer.flush();
+    }
+}
+
+pub const panic = App.panic_handler;
+const log = std.log.scoped(.default);
+
+const std = @import("std");
+const assert = std.debug.assert;
+const zterm = @import("zterm");
+const App = zterm.App(union(enum) {
+    pop_up: ?*anyopaque,
+});

examples/elements/progress.zig

@@ -0,0 +1,137 @@
+const QuitText = struct {
+    const text = "Press ctrl+c to quit.";
+
+    pub fn element(this: *@This()) App.Element {
+        return .{ .ptr = this, .vtable = &.{ .content = content } };
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        _ = ctx;
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        const row = 2;
+        const col = size.x / 2 -| (text.len / 2);
+        const anchor = (row * size.x) + col;
+
+        for (text, 0..) |cp, idx| {
+            cells[anchor + idx].style.fg = .white;
+            cells[anchor + idx].style.bg = .black;
+            cells[anchor + idx].cp = cp;
+
+            // NOTE do not write over the contents of this `Container`'s `Size`
+            if (anchor + idx == cells.len - 1) break;
+        }
+    }
+};
+
+pub fn main() !void {
+    errdefer |err| log.err("Application Error: {any}", .{err});
+
+    var gpa: std.heap.DebugAllocator(.{}) = .init;
+    defer if (gpa.deinit() == .leak) log.err("memory leak", .{});
+
+    const allocator = gpa.allocator();
+
+    var app: App = .init;
+    var renderer = zterm.Renderer.Buffered.init(allocator);
+    defer renderer.deinit();
+
+    var progress_percent: u8 = 0;
+    var progress: App.Progress(.progress) = .init(&app.queue, .{
+        .percent = .{ .enabled = true },
+        .fg = .green,
+        .bg = .grey,
+    });
+    var quit_text: QuitText = .{};
+
+    var container = try App.Container.init(allocator, .{
+        .layout = .{ .padding = .all(5) },
+    }, quit_text.element());
+    defer container.deinit();
+
+    try container.append(try App.Container.init(allocator, .{}, progress.element()));
+
+    try app.start();
+    defer app.stop() catch |err| log.err("Failed to stop application: {any}", .{err});
+
+    var framerate: u64 = 60;
+    var tick_ms: u64 = @divFloor(time.ms_per_s, framerate);
+    var next_frame_ms: u64 = 0;
+
+    var increase_progress: u64 = 10;
+
+    // Continuous drawing
+    // draw loop
+    draw: while (true) {
+        const now_ms: u64 = @intCast(time.milliTimestamp());
+        if (now_ms >= next_frame_ms) {
+            next_frame_ms = now_ms + tick_ms;
+        } else {
+            time.sleep((next_frame_ms - now_ms) * time.ns_per_ms);
+            next_frame_ms += tick_ms;
+        }
+
+        // NOTE time based progress increasion
+        increase_progress -= 1;
+        if (increase_progress == 0) {
+            increase_progress = 10;
+            progress_percent += 1;
+            if (progress_percent > 100) progress_percent = 0;
+            app.postEvent(.{ .progress = progress_percent });
+        }
+
+        const len = blk: {
+            app.queue.lock();
+            defer app.queue.unlock();
+            break :blk app.queue.len();
+        };
+
+        // handle events
+        for (0..len) |_| {
+            const event = app.queue.drain() orelse break;
+            log.debug("handling event: {s}", .{@tagName(event)});
+            // pre event handling
+            switch (event) {
+                .key => |key| {
+                    if (key.eql(.{ .cp = 'c', .mod = .{ .ctrl = true } })) app.quit();
+                },
+                .err => |err| log.err("Received {s} with message: {s}", .{ @errorName(err.err), err.msg }),
+                .focus => |b| {
+                    // NOTE reduce framerate in case the window is not focused and restore again when focused
+                    framerate = if (b) 60 else 15;
+                    tick_ms = @divFloor(time.ms_per_s, framerate);
+                },
+                else => {},
+            }
+
+            container.handle(event) catch |err| app.postEvent(.{
+                .err = .{
+                    .err = err,
+                    .msg = "Container Event handling failed",
+                },
+            });
+
+            // post event handling
+            switch (event) {
+                .quit => break :draw,
+                else => {},
+            }
+        }
+
+        container.resize(try renderer.resize());
+        container.reposition(.{});
+        try renderer.render(@TypeOf(container), &container);
+        try renderer.flush();
+    }
+}
+
+pub const panic = App.panic_handler;
+const log = std.log.scoped(.default);
+
+const std = @import("std");
+const time = std.time;
+const assert = std.debug.assert;
+const zterm = @import("zterm");
+const App = zterm.App(union(enum) {
+    progress: u8,
+});

examples/elements/scrollable.zig

@@ -0,0 +1,199 @@
+const QuitText = struct {
+    const text = "Press ctrl+c to quit.";
+
+    pub fn element(this: *@This()) App.Element {
+        return .{ .ptr = this, .vtable = &.{ .content = content } };
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        _ = ctx;
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        const row = 2;
+        const col = size.x / 2 -| (text.len / 2);
+        const anchor = (row * size.x) + col;
+
+        for (text, 0..) |cp, idx| {
+            cells[anchor + idx].style.fg = .white;
+            cells[anchor + idx].style.bg = .black;
+            cells[anchor + idx].cp = cp;
+
+            // NOTE do not write over the contents of this `Container`'s `Size`
+            if (anchor + idx == cells.len - 1) break;
+        }
+    }
+};
+
+const HelloWorldText = packed struct {
+    const text = "Hello World";
+
+    pub fn element(this: *@This()) App.Element {
+        return .{
+            .ptr = this,
+            .vtable = &.{ .content = content },
+        };
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        _ = ctx;
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        const row = size.y / 2;
+        const col = size.x / 2 -| (text.len / 2);
+        const anchor = (row * size.x) + col;
+
+        for (text, 0..) |cp, idx| {
+            cells[anchor + idx].style.fg = .white;
+            cells[anchor + idx].style.bg = .black;
+            cells[anchor + idx].cp = cp;
+
+            // NOTE do not write over the contents of this `Container`'s `Size`
+            if (anchor + idx == cells.len - 1) break;
+        }
+    }
+};
+
+pub fn main() !void {
+    errdefer |err| log.err("Application Error: {any}", .{err});
+
+    // TODO maybe create own allocator as some sort of arena allocator to have consistent memory usage
+    var gpa: std.heap.DebugAllocator(.{}) = .init;
+    defer {
+        const deinit_status = gpa.deinit();
+        if (deinit_status == .leak) {
+            log.err("memory leak", .{});
+        }
+    }
+    const allocator = gpa.allocator();
+
+    var app: App = .init;
+    var renderer = zterm.Renderer.Buffered.init(allocator);
+    defer renderer.deinit();
+
+    var element_wrapper: HelloWorldText = .{};
+    const element = element_wrapper.element();
+
+    var quit_text: QuitText = .{};
+
+    var top_box = try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .blue },
+        .layout = .{
+            .gap = 2,
+            .separator = .{
+                .enabled = true,
+            },
+            .direction = .vertical,
+            .padding = .vertical(1),
+        },
+    }, .{});
+    try top_box.append(try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .light_green },
+        .size = .{
+            .dim = .{ .y = 30 },
+        },
+    }, .{}));
+    try top_box.append(try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .light_green },
+        .size = .{
+            .dim = .{ .y = 5 },
+        },
+    }, element));
+    try top_box.append(try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .light_green },
+        .size = .{
+            .dim = .{ .y = 2 },
+        },
+    }, .{}));
+    defer top_box.deinit();
+
+    var bottom_box = try App.Container.init(allocator, .{
+        .border = .{
+            .sides = .all,
+            .color = .blue,
+        },
+        .layout = .{
+            .separator = .{
+                .enabled = true,
+                .color = .red,
+            },
+            .direction = .vertical,
+            .padding = .vertical(1),
+        },
+        .size = .{
+            .dim = .{ .y = 30 },
+        },
+    }, .{});
+    try bottom_box.append(try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .grey },
+    }, .{}));
+    try bottom_box.append(try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .grey },
+    }, element));
+    try bottom_box.append(try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .grey },
+    }, .{}));
+    defer bottom_box.deinit();
+
+    var container = try App.Container.init(allocator, .{
+        .layout = .{
+            .gap = 2,
+            .separator = .{
+                .enabled = true,
+                .line = .double,
+            },
+            .padding = .{ .top = 5, .bottom = 3, .left = 3, .right = 3 },
+            .direction = .vertical,
+        },
+    }, quit_text.element());
+    defer container.deinit();
+
+    // place empty container containing the element of the scrollable Container.
+    var scrollable_top: App.Scrollable = .init(top_box, .enabled(.grey));
+    try container.append(try App.Container.init(allocator, .{}, scrollable_top.element()));
+
+    var scrollable_bottom: App.Scrollable = .init(bottom_box, .enabled(.white));
+    try container.append(try App.Container.init(allocator, .{}, scrollable_bottom.element()));
+
+    try app.start();
+    defer app.stop() catch |err| log.err("Failed to stop application: {any}", .{err});
+
+    // event loop
+    while (true) {
+        const event = app.nextEvent();
+        log.debug("received event: {s}", .{@tagName(event)});
+
+        // pre event handling
+        switch (event) {
+            .key => |key| if (key.eql(.{ .cp = 'c', .mod = .{ .ctrl = true } })) app.quit(),
+            .err => |err| log.err("Received {s} with message: {s}", .{ @errorName(err.err), err.msg }),
+            else => {},
+        }
+
+        container.handle(event) catch |err| app.postEvent(.{
+            .err = .{
+                .err = err,
+                .msg = "Container Event handling failed",
+            },
+        });
+
+        // post event handling
+        switch (event) {
+            .quit => break,
+            else => {},
+        }
+
+        container.resize(try renderer.resize());
+        container.reposition(.{});
+        try renderer.render(@TypeOf(container), &container);
+        try renderer.flush();
+    }
+}
+
+pub const panic = App.panic_handler;
+const log = std.log.scoped(.default);
+
+const std = @import("std");
+const assert = std.debug.assert;
+const zterm = @import("zterm");
+const input = zterm.input;
+const App = zterm.App(union(enum) {});

examples/errors.zig

@@ -0,0 +1,159 @@
+const QuitText = struct {
+    const text = "Press ctrl+c to quit.";
+
+    pub fn element(this: *@This()) App.Element {
+        return .{ .ptr = this, .vtable = &.{ .content = content } };
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        _ = ctx;
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        const row = 2;
+        const col = size.x / 2 -| (text.len / 2);
+        const anchor = (row * size.x) + col;
+
+        for (text, 0..) |cp, idx| {
+            cells[anchor + idx].style.fg = .white;
+            cells[anchor + idx].style.bg = .black;
+            cells[anchor + idx].cp = cp;
+
+            // NOTE do not write over the contents of this `Container`'s `Size`
+            if (anchor + idx == cells.len - 1) break;
+        }
+    }
+};
+
+const InfoText = struct {
+    const text = "Press any key; Non-Ascii inputs (i.e. `Enter` or `Backspace`) to trigger an exception";
+
+    pub fn element(this: *@This()) App.Element {
+        return .{ .ptr = this, .vtable = &.{ .content = content } };
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        _ = ctx;
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        const row = 2;
+        const col = size.x / 2 -| (text.len / 2);
+        const anchor = (row * size.x) + col;
+
+        for (text, 0..) |cp, idx| {
+            cells[anchor + idx].style.fg = .white;
+            cells[anchor + idx].style.bg = .black;
+            cells[anchor + idx].cp = cp;
+
+            // NOTE do not write over the contents of this `Container`'s `Size`
+            if (anchor + idx == cells.len - 1) break;
+        }
+    }
+};
+
+const ErrorNotification = struct {
+    msg: ?[]const u8 = null,
+
+    pub fn element(this: *@This()) App.Element {
+        return .{ .ptr = this, .vtable = &.{ .handle = handle, .content = content } };
+    }
+
+    fn handle(ctx: *anyopaque, event: App.Event) !void {
+        const this: *@This() = @ptrCast(@alignCast(ctx));
+        switch (event) {
+            .key => |key| if (!key.isAscii()) return zterm.Error.TooSmall,
+            .err => |err| this.msg = err.msg,
+            else => {},
+        }
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        const this: *@This() = @ptrCast(@alignCast(ctx));
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        if (this.msg) |msg| {
+            const row = size.y -| 2;
+            const col = size.x -| 2 -| msg.len;
+            const anchor = (row * size.x) + col;
+
+            for (msg, 0..) |cp, idx| {
+                cells[anchor + idx].style.fg = .white;
+                cells[anchor + idx].style.bg = .black;
+                cells[anchor + idx].cp = cp;
+
+                // NOTE do not write over the contents of this `Container`'s `Size`
+                if (anchor + idx == cells.len - 1) break;
+            }
+
+            this.msg = null;
+        }
+    }
+};
+
+pub fn main() !void {
+    errdefer |err| log.err("Application Error: {any}", .{err});
+
+    var gpa: std.heap.DebugAllocator(.{}) = .init;
+    defer if (gpa.deinit() == .leak) log.err("memory leak", .{});
+
+    const allocator = gpa.allocator();
+
+    var app: App = .init;
+    var renderer = zterm.Renderer.Buffered.init(allocator);
+    defer renderer.deinit();
+
+    var quit_text: QuitText = .{};
+    var info_text: InfoText = .{};
+    var error_notification: ErrorNotification = .{};
+
+    var container = try App.Container.init(allocator, .{
+        .layout = .{
+            .gap = 2,
+            .padding = .{ .top = 5, .bottom = 3, .left = 3, .right = 3 },
+        },
+    }, quit_text.element());
+    defer container.deinit();
+
+    try container.append(try App.Container.init(allocator, .{}, info_text.element()));
+    try container.append(try App.Container.init(allocator, .{}, error_notification.element()));
+
+    try app.start();
+    defer app.stop() catch |err| log.err("Failed to stop application: {any}", .{err});
+
+    while (true) {
+        const event = app.nextEvent();
+        log.debug("received event: {s}", .{@tagName(event)});
+
+        // pre event handling
+        switch (event) {
+            .key => |key| if (key.eql(.{ .cp = 'c', .mod = .{ .ctrl = true } })) app.quit(),
+            .err => |err| log.err("Received {s} with message: {s}", .{ @errorName(err.err), err.msg }),
+            else => {},
+        }
+
+        container.handle(event) catch |err| app.postEvent(.{
+            .err = .{
+                .err = err,
+                .msg = "Container Event handling failed",
+            },
+        });
+
+        // post event handling
+        switch (event) {
+            .quit => break,
+            else => {},
+        }
+
+        container.resize(try renderer.resize());
+        container.reposition(.{});
+        try renderer.render(@TypeOf(container), &container);
+        try renderer.flush();
+    }
+}
+
+pub const panic = App.panic_handler;
+const log = std.log.scoped(.default);
+
+const std = @import("std");
+const assert = std.debug.assert;
+const zterm = @import("zterm");
+const App = zterm.App(union(enum) {});

examples/layouts/grid.zig

@@ -0,0 +1,115 @@
+const QuitText = struct {
+    const text = "Press ctrl+c to quit.";
+
+    pub fn element(this: *@This()) App.Element {
+        return .{
+            .ptr = this,
+            .vtable = &.{ .content = content },
+        };
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        _ = ctx;
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        const row = 2;
+        const col = size.x / 2 -| (text.len / 2);
+        const anchor = (row * size.x) + col;
+
+        for (text, 0..) |cp, idx| {
+            cells[anchor + idx].style.fg = .white;
+            cells[anchor + idx].style.bg = .black;
+            cells[anchor + idx].cp = cp;
+
+            // NOTE do not write over the contents of this `Container`'s `Size`
+            if (anchor + idx == cells.len - 1) break;
+        }
+    }
+};
+
+pub fn main() !void {
+    errdefer |err| log.err("Application Error: {any}", .{err});
+
+    var gpa: std.heap.DebugAllocator(.{}) = .init;
+    defer if (gpa.deinit() == .leak) log.err("memory leak", .{});
+
+    const allocator = gpa.allocator();
+
+    var app: App = .init;
+    var renderer = zterm.Renderer.Buffered.init(allocator);
+    defer renderer.deinit();
+
+    var quit_text: QuitText = .{};
+    const element = quit_text.element();
+
+    var container = try App.Container.init(allocator, .{
+        .layout = .{
+            .separator = .{ .enabled = true },
+            .padding = .{ .top = 5, .bottom = 3, .left = 3, .right = 3 },
+            .direction = .horizontal,
+        },
+    }, element);
+    for (0..3) |_| {
+        var column = try App.Container.init(allocator, .{
+            .layout = .{
+                .separator = .{ .enabled = true },
+                .direction = .vertical,
+            },
+        }, .{});
+        try column.append(try App.Container.init(allocator, .{
+            .rectangle = .{ .fill = .blue },
+        }, .{}));
+        try column.append(try App.Container.init(allocator, .{
+            .rectangle = .{ .fill = .blue },
+        }, .{}));
+        try column.append(try App.Container.init(allocator, .{
+            .rectangle = .{ .fill = .blue },
+        }, .{}));
+        try container.append(column);
+    }
+    defer container.deinit(); // also de-initializes the children
+
+    try app.start();
+    defer app.stop() catch |err| log.err("Failed to stop application: {any}", .{err});
+
+    // event loop
+    while (true) {
+        const event = app.nextEvent();
+        log.debug("received event: {s}", .{@tagName(event)});
+
+        // pre event handling
+        switch (event) {
+            .key => |key| if (key.eql(.{ .cp = 'c', .mod = .{ .ctrl = true } })) app.quit(),
+            // NOTE errors could be displayed in another container in case one was received, etc. to provide the user with feedback
+            .err => |err| log.err("Received {s} with message: {s}", .{ @errorName(err.err), err.msg }),
+            else => {},
+        }
+
+        // NOTE returned errors should be propagated back to the application
+        container.handle(event) catch |err| app.postEvent(.{
+            .err = .{
+                .err = err,
+                .msg = "Container Event handling failed",
+            },
+        });
+
+        // post event handling
+        switch (event) {
+            .quit => break,
+            else => {},
+        }
+
+        container.resize(try renderer.resize());
+        container.reposition(.{});
+        try renderer.render(@TypeOf(container), &container);
+        try renderer.flush();
+    }
+}
+
+pub const panic = App.panic_handler;
+const log = std.log.scoped(.default);
+
+const std = @import("std");
+const assert = std.debug.assert;
+const zterm = @import("zterm");
+const App = zterm.App(union(enum) {});

examples/layouts/horizontal.zig

@@ -0,0 +1,107 @@
+const QuitText = struct {
+    const text = "Press ctrl+c to quit.";
+
+    pub fn element(this: *@This()) App.Element {
+        return .{
+            .ptr = this,
+            .vtable = &.{ .content = content },
+        };
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        _ = ctx;
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        const row = 2;
+        const col = size.x / 2 -| (text.len / 2);
+        const anchor = (row * size.x) + col;
+
+        for (text, 0..) |cp, idx| {
+            cells[anchor + idx].style.fg = .white;
+            cells[anchor + idx].style.bg = .black;
+            cells[anchor + idx].cp = cp;
+
+            // NOTE do not write over the contents of this `Container`'s `Size`
+            if (anchor + idx == cells.len - 1) break;
+        }
+    }
+};
+
+pub fn main() !void {
+    errdefer |err| log.err("Application Error: {any}", .{err});
+
+    var gpa: std.heap.DebugAllocator(.{}) = .init;
+    defer if (gpa.deinit() == .leak) log.err("memory leak", .{});
+
+    const allocator = gpa.allocator();
+
+    var app: App = .init;
+    var renderer = zterm.Renderer.Buffered.init(allocator);
+    defer renderer.deinit();
+
+    var quit_text: QuitText = .{};
+    const element = quit_text.element();
+
+    var container = try App.Container.init(allocator, .{
+        .border = .{},
+        .layout = .{
+            .gap = 2,
+            .padding = .{ .top = 5, .bottom = 3, .left = 3, .right = 3 },
+            .direction = .horizontal,
+        },
+    }, element);
+    try container.append(try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .blue },
+    }, .{}));
+    try container.append(try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .blue },
+    }, .{}));
+    try container.append(try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .blue },
+    }, .{}));
+    defer container.deinit(); // also de-initializes the children
+
+    try app.start();
+    defer app.stop() catch |err| log.err("Failed to stop application: {any}", .{err});
+
+    // event loop
+    while (true) {
+        const event = app.nextEvent();
+        log.debug("received event: {s}", .{@tagName(event)});
+
+        // pre event handling
+        switch (event) {
+            .key => |key| if (key.eql(.{ .cp = 'c', .mod = .{ .ctrl = true } })) app.quit(),
+            // NOTE errors could be displayed in another container in case one was received, etc. to provide the user with feedback
+            .err => |err| log.err("Received {s} with message: {s}", .{ @errorName(err.err), err.msg }),
+            else => {},
+        }
+
+        // NOTE returned errors should be propagated back to the application
+        container.handle(event) catch |err| app.postEvent(.{
+            .err = .{
+                .err = err,
+                .msg = "Container Event handling failed",
+            },
+        });
+
+        // post event handling
+        switch (event) {
+            .quit => break,
+            else => {},
+        }
+
+        container.resize(try renderer.resize());
+        container.reposition(.{});
+        try renderer.render(@TypeOf(container), &container);
+        try renderer.flush();
+    }
+}
+
+pub const panic = App.panic_handler;
+const log = std.log.scoped(.default);
+
+const std = @import("std");
+const assert = std.debug.assert;
+const zterm = @import("zterm");
+const App = zterm.App(union(enum) {});

examples/layouts/mixed.zig

@@ -0,0 +1,123 @@
+const QuitText = struct {
+    const text = "Press ctrl+c to quit.";
+
+    pub fn element(this: *@This()) App.Element {
+        return .{
+            .ptr = this,
+            .vtable = &.{ .content = content },
+        };
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        _ = ctx;
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        const row = 2;
+        const col = size.x / 2 -| (text.len / 2);
+        const anchor = (row * size.x) + col;
+
+        for (text, 0..) |cp, idx| {
+            cells[anchor + idx].style.fg = .white;
+            cells[anchor + idx].style.bg = .black;
+            cells[anchor + idx].cp = cp;
+
+            // NOTE do not write over the contents of this `Container`'s `Size`
+            if (anchor + idx == cells.len - 1) break;
+        }
+    }
+};
+
+pub fn main() !void {
+    errdefer |err| log.err("Application Error: {any}", .{err});
+
+    var gpa: std.heap.DebugAllocator(.{}) = .init;
+    defer if (gpa.deinit() == .leak) log.err("memory leak", .{});
+
+    const allocator = gpa.allocator();
+
+    var app: App = .init;
+    var renderer = zterm.Renderer.Buffered.init(allocator);
+    defer renderer.deinit();
+
+    var quit_text: QuitText = .{};
+    const element = quit_text.element();
+
+    var container = try App.Container.init(allocator, .{
+        .layout = .{
+            .gap = 2,
+            .padding = .{ .top = 5, .bottom = 3, .left = 3, .right = 3 },
+        },
+    }, element);
+    for (0..3) |i| {
+        var column = try App.Container.init(allocator, .{
+            .layout = .{
+                .separator = .{ .enabled = true },
+                .direction = if (i > 0) .vertical else .horizontal,
+            },
+        }, .{});
+        if (i != 1) {
+            try column.append(try App.Container.init(allocator, .{
+                .rectangle = .{ .fill = .green },
+            }, .{}));
+            try column.append(try App.Container.init(allocator, .{
+                .rectangle = .{ .fill = .yellow },
+            }, .{}));
+        } else {
+            try column.append(try App.Container.init(allocator, .{
+                .size = .{
+                    .dim = .{ .y = 4 },
+                    .grow = .horizontal,
+                },
+            }, .{}));
+        }
+        try column.append(try App.Container.init(allocator, .{
+            .rectangle = .{ .fill = .blue },
+        }, .{}));
+        try container.append(column);
+    }
+    defer container.deinit(); // also de-initializes the children
+
+    try app.start();
+    defer app.stop() catch |err| log.err("Failed to stop application: {any}", .{err});
+
+    // event loop
+    while (true) {
+        const event = app.nextEvent();
+        log.debug("received event: {s}", .{@tagName(event)});
+
+        // pre event handling
+        switch (event) {
+            .key => |key| if (key.eql(.{ .cp = 'c', .mod = .{ .ctrl = true } })) app.quit(),
+            // NOTE errors could be displayed in another container in case one was received, etc. to provide the user with feedback
+            .err => |err| log.err("Received {s} with message: {s}", .{ @errorName(err.err), err.msg }),
+            else => {},
+        }
+
+        // NOTE returned errors should be propagated back to the application
+        container.handle(event) catch |err| app.postEvent(.{
+            .err = .{
+                .err = err,
+                .msg = "Container Event handling failed",
+            },
+        });
+
+        // post event handling
+        switch (event) {
+            .quit => break,
+            else => {},
+        }
+
+        container.resize(try renderer.resize());
+        container.reposition(.{});
+        try renderer.render(@TypeOf(container), &container);
+        try renderer.flush();
+    }
+}
+
+pub const panic = App.panic_handler;
+const log = std.log.scoped(.default);
+
+const std = @import("std");
+const assert = std.debug.assert;
+const zterm = @import("zterm");
+const App = zterm.App(union(enum) {});

examples/layouts/vertical.zig

@@ -0,0 +1,106 @@
+const QuitText = struct {
+    const text = "Press ctrl+c to quit.";
+
+    pub fn element(this: *@This()) App.Element {
+        return .{
+            .ptr = this,
+            .vtable = &.{ .content = content },
+        };
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        _ = ctx;
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        const row = 2;
+        const col = size.x / 2 -| (text.len / 2);
+        const anchor = (row * size.x) + col;
+
+        for (text, 0..) |cp, idx| {
+            cells[anchor + idx].style.fg = .white;
+            cells[anchor + idx].style.bg = .black;
+            cells[anchor + idx].cp = cp;
+
+            // NOTE do not write over the contents of this `Container`'s `Size`
+            if (anchor + idx == cells.len - 1) break;
+        }
+    }
+};
+
+pub fn main() !void {
+    errdefer |err| log.err("Application Error: {any}", .{err});
+
+    var gpa: std.heap.DebugAllocator(.{}) = .init;
+    defer if (gpa.deinit() == .leak) log.err("memory leak", .{});
+
+    const allocator = gpa.allocator();
+
+    var app: App = .init;
+    var renderer = zterm.Renderer.Buffered.init(allocator);
+    defer renderer.deinit();
+
+    var quit_text: QuitText = .{};
+    const element = quit_text.element();
+
+    var container = try App.Container.init(allocator, .{
+        .layout = .{
+            .gap = 2,
+            .padding = .{ .top = 5, .bottom = 3, .left = 3, .right = 3 },
+            .direction = .vertical,
+        },
+    }, element);
+    try container.append(try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .blue },
+    }, .{}));
+    try container.append(try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .blue },
+    }, .{}));
+    try container.append(try App.Container.init(allocator, .{
+        .rectangle = .{ .fill = .blue },
+    }, .{}));
+    defer container.deinit(); // also de-initializes the children
+
+    try app.start();
+    defer app.stop() catch |err| log.err("Failed to stop application: {any}", .{err});
+
+    // event loop
+    while (true) {
+        const event = app.nextEvent();
+        log.debug("received event: {s}", .{@tagName(event)});
+
+        // pre event handling
+        switch (event) {
+            .key => |key| if (key.eql(.{ .cp = 'c', .mod = .{ .ctrl = true } })) app.quit(),
+            // NOTE errors could be displayed in another container in case one was received, etc. to provide the user with feedback
+            .err => |err| log.err("Received {s} with message: {s}", .{ @errorName(err.err), err.msg }),
+            else => {},
+        }
+
+        // NOTE returned errors should be propagated back to the application
+        container.handle(event) catch |err| app.postEvent(.{
+            .err = .{
+                .err = err,
+                .msg = "Container Event handling failed",
+            },
+        });
+
+        // post event handling
+        switch (event) {
+            .quit => break,
+            else => {},
+        }
+
+        container.resize(try renderer.resize());
+        container.reposition(.{});
+        try renderer.render(@TypeOf(container), &container);
+        try renderer.flush();
+    }
+}
+
+pub const panic = App.panic_handler;
+const log = std.log.scoped(.default);
+
+const std = @import("std");
+const assert = std.debug.assert;
+const zterm = @import("zterm");
+const App = zterm.App(union(enum) {});

examples/styles/palette.zig

@@ -0,0 +1,102 @@
+const QuitText = struct {
+    const text = "Press ctrl+c to quit.";
+
+    pub fn element(this: *@This()) App.Element {
+        return .{ .ptr = this, .vtable = &.{ .content = content } };
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        _ = ctx;
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        const row = 2;
+        const col = size.x / 2 -| (text.len / 2);
+        const anchor = (row * size.x) + col;
+
+        for (text, 0..) |cp, idx| {
+            cells[anchor + idx].style.fg = .white;
+            cells[anchor + idx].style.bg = .black;
+            cells[anchor + idx].cp = cp;
+
+            // NOTE do not write over the contents of this `Container`'s `Size`
+            if (anchor + idx == cells.len - 1) break;
+        }
+    }
+};
+
+pub fn main() !void {
+    errdefer |err| log.err("Application Error: {any}", .{err});
+
+    var gpa: std.heap.DebugAllocator(.{}) = .init;
+    defer if (gpa.deinit() == .leak) log.err("memory leak", .{});
+
+    const allocator = gpa.allocator();
+
+    var app: App = .init;
+    var renderer = zterm.Renderer.Buffered.init(allocator);
+    defer renderer.deinit();
+
+    var quit_text: QuitText = .{};
+    const element = quit_text.element();
+
+    var container = try App.Container.init(allocator, .{
+        .layout = .{
+            .gap = 2,
+            .padding = .{ .top = 5, .bottom = 3, .left = 3, .right = 3 },
+        },
+    }, element);
+    defer container.deinit();
+
+    var box = try App.Container.init(allocator, .{
+        .layout = .{ .direction = .horizontal },
+    }, .{});
+    defer box.deinit();
+
+    inline for (std.meta.fields(zterm.Color)) |field| {
+        if (field.value == 0) continue; // zterm.Color.default == 0 -> skip
+        try box.append(try App.Container.init(allocator, .{ .rectangle = .{ .fill = @enumFromInt(field.value) } }, .{}));
+    }
+    var scrollable: App.Scrollable = .init(box, .disabled);
+    try container.append(try App.Container.init(allocator, .{}, scrollable.element()));
+
+    try app.start();
+    defer app.stop() catch |err| log.err("Failed to stop application: {any}", .{err});
+
+    while (true) {
+        const event = app.nextEvent();
+        log.debug("received event: {s}", .{@tagName(event)});
+
+        // pre event handling
+        switch (event) {
+            .key => |key| if (key.eql(.{ .cp = 'c', .mod = .{ .ctrl = true } })) app.quit(),
+            .err => |err| log.err("Received {s} with message: {s}", .{ @errorName(err.err), err.msg }),
+            else => {},
+        }
+
+        container.handle(event) catch |err| app.postEvent(.{
+            .err = .{
+                .err = err,
+                .msg = "Container Event handling failed",
+            },
+        });
+
+        // post event handling
+        switch (event) {
+            .quit => break,
+            else => {},
+        }
+
+        container.resize(try renderer.resize());
+        container.reposition(.{});
+        try renderer.render(@TypeOf(container), &container);
+        try renderer.flush();
+    }
+}
+
+pub const panic = App.panic_handler;
+const log = std.log.scoped(.default);
+
+const std = @import("std");
+const assert = std.debug.assert;
+const zterm = @import("zterm");
+const App = zterm.App(union(enum) {});

examples/styles/text.zig

@@ -0,0 +1,157 @@
+const QuitText = struct {
+    const text = "Press ctrl+c to quit.";
+
+    pub fn element(this: *@This()) App.Element {
+        return .{ .ptr = this, .vtable = &.{ .content = content } };
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        _ = ctx;
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        const row = 2;
+        const col = size.x / 2 -| (text.len / 2);
+        const anchor = (row * size.x) + col;
+
+        for (text, 0..) |cp, idx| {
+            cells[anchor + idx].style.fg = .white;
+            cells[anchor + idx].style.bg = .black;
+            cells[anchor + idx].cp = cp;
+
+            // NOTE do not write over the contents of this `Container`'s `Size`
+            if (anchor + idx == cells.len - 1) break;
+        }
+    }
+};
+
+const TextStyles = struct {
+    const text = "Example";
+
+    pub fn element(this: *@This()) App.Element {
+        return .{ .ptr = this, .vtable = &.{ .content = content } };
+    }
+
+    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Point) !void {
+        @setEvalBranchQuota(10000);
+        _ = ctx;
+        assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
+
+        var row: usize = 0;
+        var col: usize = 0;
+
+        // Color
+        inline for (std.meta.fields(zterm.Color)) |bg_field| {
+            if (bg_field.value == 0) continue; // zterm.Color.default == 0 -> skip
+
+            inline for (std.meta.fields(zterm.Color)) |fg_field| {
+                if (fg_field.value == 0) continue; // zterm.Color.default == 0 -> skip
+                if (fg_field.value == bg_field.value) continue;
+
+                // witouth any emphasis
+                for (text) |cp| {
+                    cells[(row * size.x) + col].style.bg = @enumFromInt(bg_field.value);
+                    cells[(row * size.x) + col].style.fg = @enumFromInt(fg_field.value);
+                    cells[(row * size.x) + col].cp = cp;
+                    col += 1;
+                }
+
+                // emphasis (no combinations)
+                inline for (std.meta.fields(zterm.Style.Emphasis)) |emp_field| {
+                    if (emp_field.value == 0) continue; // zterm.Style.Emphasis.reset == 0 -> skip
+                    const emphasis: zterm.Style.Emphasis = @enumFromInt(emp_field.value);
+
+                    for (text) |cp| {
+                        cells[(row * size.x) + col].style.bg = @enumFromInt(bg_field.value);
+                        cells[(row * size.x) + col].style.fg = @enumFromInt(fg_field.value);
+                        cells[(row * size.x) + col].style.emphasis = &.{emphasis};
+                        cells[(row * size.x) + col].cp = cp;
+                        col += 1;
+                    }
+                }
+                row += 1;
+                col = 0;
+            }
+        }
+    }
+};
+
+pub fn main() !void {
+    errdefer |err| log.err("Application Error: {any}", .{err});
+
+    var gpa: std.heap.DebugAllocator(.{}) = .init;
+    defer if (gpa.deinit() == .leak) log.err("memory leak", .{});
+
+    const allocator = gpa.allocator();
+
+    var app: App = .init;
+    var renderer = zterm.Renderer.Buffered.init(allocator);
+    defer renderer.deinit();
+
+    var quit_text: QuitText = .{};
+    const element = quit_text.element();
+
+    var text_styles: TextStyles = .{};
+
+    var container = try App.Container.init(allocator, .{
+        .layout = .{
+            .gap = 2,
+            .padding = .{ .top = 5, .bottom = 3, .left = 3, .right = 3 },
+        },
+    }, element);
+    defer container.deinit();
+
+    var box = try App.Container.init(allocator, .{
+        .layout = .{ .direction = .vertical },
+        .size = .{
+            .dim = .{
+                .x = std.meta.fields(zterm.Style.Emphasis).len * TextStyles.text.len,
+                .y = (std.meta.fields(zterm.Color).len - 1) * (std.meta.fields(zterm.Color).len - 2),
+            },
+        },
+    }, text_styles.element());
+    defer box.deinit();
+
+    var scrollable: App.Scrollable = .init(box, .disabled);
+    try container.append(try App.Container.init(allocator, .{}, scrollable.element()));
+
+    try app.start();
+    defer app.stop() catch |err| log.err("Failed to stop application: {any}", .{err});
+
+    while (true) {
+        const event = app.nextEvent();
+        log.debug("received event: {s}", .{@tagName(event)});
+
+        // pre event handling
+        switch (event) {
+            .key => |key| if (key.eql(.{ .cp = 'c', .mod = .{ .ctrl = true } })) app.quit(),
+            .err => |err| log.err("Received {s} with message: {s}", .{ @errorName(err.err), err.msg }),
+            else => {},
+        }
+
+        container.handle(event) catch |err| app.postEvent(.{
+            .err = .{
+                .err = err,
+                .msg = "Container Event handling failed",
+            },
+        });
+
+        // post event handling
+        switch (event) {
+            .quit => break,
+            else => {},
+        }
+
+        container.resize(try renderer.resize());
+        container.reposition(.{});
+        try renderer.render(@TypeOf(container), &container);
+        try renderer.flush();
+    }
+}
+
+pub const panic = App.panic_handler;
+const log = std.log.scoped(.default);
+
+const std = @import("std");
+const assert = std.debug.assert;
+const zterm = @import("zterm");
+const App = zterm.App(union(enum) {});

src/app.zig

@@ -1,16 +1,4 @@
 //! Application type for TUI-applications
-const std = @import("std");
-const terminal = @import("terminal.zig");
-const event = @import("event.zig");
-
-const mergeTaggedUnions = event.mergeTaggedUnions;
-const isTaggedUnion = event.isTaggedUnion;
-
-const Key = @import("key.zig");
-const Size = @import("size.zig").Size;
-const Queue = @import("queue.zig").Queue;
-
-const log = std.log.scoped(.app);
 
 /// Create the App Type with the associated user events _E_ which describes
 /// an tagged union for all the user events that can be send through the
@@ -36,71 +24,60 @@ pub fn App(comptime E: type) type {
         @compileError("Provided user event `E` for `App(comptime E: type)` is not of type `union(enum)`.");
     }
     return struct {
-        pub const Event = mergeTaggedUnions(event.SystemEvent, E);
+        queue: Queue,
-        pub const Container = @import("container.zig").Container(Event);
+        thread: ?Thread = null,
-        pub const Element = @import("element.zig").Element(Event);
+        quit_event: Thread.ResetEvent,
+        termios: ?posix.termios = null,
+        winch_registered: bool = false,
 
-        queue: Queue(Event, 256),
+        // global variable for the registered handler for WINCH
-        thread: ?std.Thread,
+        var handler_ctx: *anyopaque = undefined;
-        quit_event: std.Thread.ResetEvent,
+        /// registered WINCH handler to report resize events
-        termios: ?std.posix.termios = null,
+        fn handleWinch(_: c_int) callconv(.C) void {
-        attached_handler: bool = false,
+            const this: *@This() = @ptrCast(@alignCast(handler_ctx));
-        prev_size: Size,
+            // NOTE this does not have to be done if in-band resize events are supported
-
+            // -> the signal might not work correctly when hosting the application over ssh!
-        pub const SignalHandler = struct {
+            this.postEvent(.resize);
-            context: *anyopaque,
+        }
-            callback: *const fn (context: *anyopaque) void,
-        };
 
         pub const init: @This() = .{
             .queue = .{},
-            .thread = null,
             .quit_event = .{},
-            .termios = null,
-            .attached_handler = false,
-            .prev_size = .{},
         };
 
         pub fn start(this: *@This()) !void {
             if (this.thread) |_| return;
 
-            if (!this.attached_handler) {
-                var winch_act = std.posix.Sigaction{
-                    .handler = .{ .handler = @This().handleWinch },
-                    .mask = std.posix.empty_sigset,
-                    .flags = 0,
-                };
-                std.posix.sigaction(std.posix.SIG.WINCH, &winch_act, null);
-
-                try registerWinch(.{
-                    .context = this,
-                    .callback = @This().winsizeCallback,
-                });
-                this.attached_handler = true;
-
             // post init event (as the very first element to be in the queue - event loop)
             this.postEvent(.init);
+
+            if (!this.winch_registered) {
+                handler_ctx = this;
+                var act = posix.Sigaction{
+                    .handler = .{ .handler = handleWinch },
+                    .mask = posix.sigemptyset(),
+                    .flags = 0,
+                };
+                posix.sigaction(posix.SIG.WINCH, &act, null);
+                this.winch_registered = true;
             }
 
             this.quit_event.reset();
-            this.thread = try std.Thread.spawn(.{}, @This().run, .{this});
+            this.thread = try Thread.spawn(.{}, @This().run, .{this});
 
-            var termios: std.posix.termios = undefined;
+            var termios: posix.termios = undefined;
             try terminal.enableRawMode(&termios);
             if (this.termios) |_| {} else this.termios = termios;
 
             try terminal.saveScreen();
             try terminal.enterAltScreen();
             try terminal.hideCursor();
-
+            try terminal.enableMouseSupport();
-            // send initial size afterwards
-            const size = terminal.getTerminalSize();
-            this.postEvent(.{ .resize = size });
-            this.prev_size = size;
         }
 
         pub fn interrupt(this: *@This()) !void {
             this.quit_event.set();
+            try terminal.disableMouseSupport();
             try terminal.exitAltScreen();
             try terminal.restoreScreen();
             if (this.thread) |thread| {
@@ -112,9 +89,10 @@ pub fn App(comptime E: type) type {
         pub fn stop(this: *@This()) !void {
             try this.interrupt();
             if (this.termios) |*termios| {
-                try terminal.disableRawMode(termios);
+                try terminal.disableMouseSupport();
                 try terminal.showCursor();
                 try terminal.exitAltScreen();
+                try terminal.disableRawMode(termios);
                 try terminal.restoreScreen();
             }
             this.termios = null;
@@ -137,64 +115,36 @@ pub fn App(comptime E: type) type {
             this.queue.push(e);
         }
 
-        fn winsizeCallback(ptr: *anyopaque) void {
-            const this: *@This() = @ptrCast(@alignCast(ptr));
-            const size = terminal.getTerminalSize();
-            if (size.cols != this.prev_size.cols or size.rows != this.prev_size.rows) {
-                this.postEvent(.{ .resize = size });
-                this.prev_size = size;
-            }
-        }
-
-        var winch_handler: ?SignalHandler = null;
-
-        fn registerWinch(handler: SignalHandler) !void {
-            if (winch_handler) |_| {
-                @panic("Cannot register another WINCH handler.");
-            }
-            winch_handler = handler;
-        }
-
-        fn handleWinch(_: c_int) callconv(.C) void {
-            if (winch_handler) |handler| {
-                handler.callback(handler.context);
-            }
-        }
-
         fn run(this: *@This()) !void {
-            // send initial terminal size
-            // changes are handled by the winch signal handler
-            // see `App.start` and `App.registerWinch` for details
-            {}
-
             // thread to read user inputs
             var buf: [256]u8 = undefined;
             while (true) {
-                // FIX: I still think that there is a race condition (I'm just waiting 'long' enough)
+                // FIX I still think that there is a race condition (I'm just waiting 'long' enough)
                 this.quit_event.timedWait(20 * std.time.ns_per_ms) catch {
+                    // FIX in case the queue is full -> the next user input should panic and quit the application? because something seems to clock up the event queue
                     const read_bytes = try terminal.read(buf[0..]);
+                    // TODO `break` should not terminate the reading of the user inputs, but instead only the received faulty input!
                     // escape key presses
                     if (buf[0] == 0x1b and read_bytes > 1) {
                         switch (buf[1]) {
                             0x4F => { // ss3
                                 if (read_bytes < 3) continue;
 
-                                const key: ?Key = switch (buf[2]) {
+                                const key: Key = switch (buf[2]) {
-                                    0x1B => null,
+                                    'A' => .{ .cp = input.Up },
-                                    'A' => .{ .cp = Key.up },
+                                    'B' => .{ .cp = input.Down },
-                                    'B' => .{ .cp = Key.down },
+                                    'C' => .{ .cp = input.Right },
-                                    'C' => .{ .cp = Key.right },
+                                    'D' => .{ .cp = input.Left },
-                                    'D' => .{ .cp = Key.left },
+                                    'E' => .{ .cp = input.KpBegin },
-                                    'E' => .{ .cp = Key.kp_begin },
+                                    'F' => .{ .cp = input.End },
-                                    'F' => .{ .cp = Key.end },
+                                    'H' => .{ .cp = input.Home },
-                                    'H' => .{ .cp = Key.home },
+                                    'P' => .{ .cp = input.F1 },
-                                    'P' => .{ .cp = Key.f1 },
+                                    'Q' => .{ .cp = input.F2 },
-                                    'Q' => .{ .cp = Key.f2 },
+                                    'R' => .{ .cp = input.F3 },
-                                    'R' => .{ .cp = Key.f3 },
+                                    'S' => .{ .cp = input.F4 },
-                                    'S' => .{ .cp = Key.f4 },
+                                    else => continue,
-                                    else => null,
                                 };
-                                if (key) |k| this.postEvent(.{ .key = k });
+                                this.postEvent(.{ .key = key });
                             },
                             0x5B => { // csi
                                 if (read_bytes < 3) continue;
@@ -213,64 +163,139 @@ pub fn App(comptime E: type) type {
                                         // Legacy keys
                                         // CSI {ABCDEFHPQS}
                                         // CSI 1 ; modifier:event_type {ABCDEFHPQS}
+                                        var field_iter = std.mem.splitScalar(u8, sequence[2 .. sequence.len - 1], ';');
+                                        _ = field_iter.next(); // skip first field
+
                                         const key: Key = .{
                                             .cp = switch (final) {
-                                                'A' => Key.up,
+                                                'A' => input.Up,
-                                                'B' => Key.down,
+                                                'B' => input.Down,
-                                                'C' => Key.right,
+                                                'C' => input.Right,
-                                                'D' => Key.left,
+                                                'D' => input.Left,
-                                                'E' => Key.kp_begin,
+                                                'E' => input.KpBegin,
-                                                'F' => Key.end,
+                                                'F' => input.End,
-                                                'H' => Key.home,
+                                                'H' => input.Home,
-                                                'P' => Key.f1,
+                                                'P' => input.F1,
-                                                'Q' => Key.f2,
+                                                'Q' => input.F2,
-                                                'R' => Key.f3,
+                                                'R' => input.F3,
-                                                'S' => Key.f4,
+                                                'S' => input.F4,
-                                                else => unreachable, // switch case prevents in this case form ever happening
+                                                else => unreachable,
+                                            },
+                                            .mod = blk: {
+                                                // modifier_mask:event_type
+                                                var mod: Key.Modifier = .{};
+                                                const field_buf = field_iter.next() orelse break :blk mod;
+                                                var param_iter = std.mem.splitScalar(u8, field_buf, ':');
+                                                const modifier_buf = param_iter.next() orelse unreachable;
+                                                const modifier_mask = fmt.parseUnsigned(u8, modifier_buf, 10) catch break :blk mod;
+                                                if ((modifier_mask -| 1) & 1 != 0) mod.shift = true;
+                                                if ((modifier_mask -| 1) & 2 != 0) mod.alt = true;
+                                                if ((modifier_mask -| 1) & 4 != 0) mod.ctrl = true;
+                                                break :blk mod;
                                             },
                                         };
                                         this.postEvent(.{ .key = key });
                                     },
+                                    'Z' => this.postEvent(.{ .key = .{ .cp = input.Tab, .mod = .{ .shift = true } } }),
                                     '~' => {
                                         // Legacy keys
                                         // CSI number ~
                                         // CSI number ; modifier ~
                                         // CSI number ; modifier:event_type ; text_as_codepoint ~
-                                        var field_iter = std.mem.splitScalar(u8, sequence[2 .. sequence.len - 1], ';');
+                                        var field_iter = mem.splitScalar(u8, sequence[2 .. sequence.len - 1], ';');
-                                        const number_buf = field_iter.next() orelse unreachable; // always will have one field
-                                        const number = std.fmt.parseUnsigned(u16, number_buf, 10) catch break;
 
                                         const key: Key = .{
-                                            .cp = switch (number) {
+                                            .cp = blk: {
-                                                2 => Key.insert,
+                                                const number_buf = field_iter.next() orelse unreachable; // always will have one field
-                                                3 => Key.delete,
+                                                const number = fmt.parseUnsigned(u16, number_buf, 10) catch break;
-                                                5 => Key.page_up,
+                                                break :blk switch (number) {
-                                                6 => Key.page_down,
+                                                    2 => input.Insert,
-                                                7 => Key.home,
+                                                    3 => input.Delete,
-                                                8 => Key.end,
+                                                    5 => input.PageUp,
-                                                11 => Key.f1,
+                                                    6 => input.PageDown,
-                                                12 => Key.f2,
+                                                    7 => input.Home,
-                                                13 => Key.f3,
+                                                    8 => input.End,
-                                                14 => Key.f4,
+                                                    11 => input.F1,
-                                                15 => Key.f5,
+                                                    12 => input.F2,
-                                                17 => Key.f6,
+                                                    13 => input.F3,
-                                                18 => Key.f7,
+                                                    14 => input.F4,
-                                                19 => Key.f8,
+                                                    15 => input.F5,
-                                                20 => Key.f9,
+                                                    17 => input.F6,
-                                                21 => Key.f10,
+                                                    18 => input.F7,
-                                                23 => Key.f11,
+                                                    19 => input.F8,
-                                                24 => Key.f12,
+                                                    20 => input.F9,
+                                                    21 => input.F10,
+                                                    23 => input.F11,
+                                                    24 => input.F12,
+                                                    25 => input.F13,
+                                                    26 => input.F14,
+                                                    28 => input.F15,
+                                                    29 => input.F16,
+                                                    31 => input.F17,
+                                                    32 => input.F18,
+                                                    33 => input.F19,
+                                                    34 => input.F20,
                                                     // 200 => return .{ .event = .paste_start, .n = sequence.len },
                                                     // 201 => return .{ .event = .paste_end, .n = sequence.len },
-                                                57427 => Key.kp_begin,
+                                                    57399...57454 => |code| code,
                                                     else => unreachable,
+                                                };
+                                            },
+                                            .mod = blk: {
+                                                // modifier_mask:event_type
+                                                var mod: Key.Modifier = .{};
+                                                const field_buf = field_iter.next() orelse break :blk mod;
+                                                var param_iter = std.mem.splitScalar(u8, field_buf, ':');
+                                                const modifier_buf = param_iter.next() orelse unreachable;
+                                                const modifier_mask = fmt.parseUnsigned(u8, modifier_buf, 10) catch break :blk mod;
+                                                if ((modifier_mask -| 1) & 1 != 0) mod.shift = true;
+                                                if ((modifier_mask -| 1) & 2 != 0) mod.alt = true;
+                                                if ((modifier_mask -| 1) & 4 != 0) mod.ctrl = true;
+                                                break :blk mod;
                                             },
                                         };
                                         this.postEvent(.{ .key = key });
                                     },
+                                    // TODO focus usage? should this even be in the default event system?
                                     'I' => this.postEvent(.{ .focus = true }),
                                     'O' => this.postEvent(.{ .focus = false }),
-                                    // 'M', 'm' => return parseMouse(sequence), // TODO: parse mouse inputs
+                                    'M', 'm' => {
+                                        assert(sequence.len >= 4);
+                                        if (sequence[2] != '<') break;
+
+                                        const delim1 = mem.indexOfScalarPos(u8, sequence, 3, ';') orelse break;
+                                        const button_mask = fmt.parseUnsigned(u16, sequence[3..delim1], 10) catch break;
+                                        const delim2 = mem.indexOfScalarPos(u8, sequence, delim1 + 1, ';') orelse break;
+                                        const px = fmt.parseUnsigned(u16, sequence[delim1 + 1 .. delim2], 10) catch break;
+                                        const py = fmt.parseUnsigned(u16, sequence[delim2 + 1 .. sequence.len - 1], 10) catch break;
+
+                                        const mouse_bits = packed struct {
+                                            const motion: u8 = 0b00100000;
+                                            const buttons: u8 = 0b11000011;
+                                            const shift: u8 = 0b00000100;
+                                            const alt: u8 = 0b00001000;
+                                            const ctrl: u8 = 0b00010000;
+                                        };
+
+                                        const button: Mouse.Button = @enumFromInt(button_mask & mouse_bits.buttons);
+                                        const motion = button_mask & mouse_bits.motion > 0;
+                                        // const shift = button_mask & mouse_bits.shift > 0;
+                                        // const alt = button_mask & mouse_bits.alt > 0;
+                                        // const ctrl = button_mask & mouse_bits.ctrl > 0;
+
+                                        const mouse: Mouse = .{
+                                            .button = button,
+                                            .x = px -| 1,
+                                            .y = py -| 1,
+                                            .kind = blk: {
+                                                if (motion and button != Mouse.Button.none) break :blk .drag;
+                                                if (motion and button == Mouse.Button.none) break :blk .motion;
+                                                if (sequence[sequence.len - 1] == 'm') break :blk .release;
+                                                break :blk .press;
+                                            },
+                                        };
+                                        this.postEvent(.{ .mouse = mouse });
+                                    },
                                     'c' => {
                                         // Primary DA (CSI ? Pm c)
                                     },
@@ -278,29 +303,26 @@ pub fn App(comptime E: type) type {
                                         // Device Status Report
                                         // CSI Ps n
                                         // CSI ? Ps n
-                                        std.debug.assert(sequence.len >= 3);
+                                        assert(sequence.len >= 3);
                                     },
                                     't' => {
                                         // XTWINOPS
                                         // Split first into fields delimited by ';'
-                                        var iter = std.mem.splitScalar(u8, sequence[2 .. sequence.len - 1], ';');
+                                        var iter = mem.splitScalar(u8, sequence[2 .. sequence.len - 1], ';');
                                         const ps = iter.first();
-                                        if (std.mem.eql(u8, "48", ps)) {
+                                        if (mem.eql(u8, "48", ps)) {
                                             // in band window resize
                                             // CSI 48 ; height ; width ; height_pix ; width_pix t
-                                            const height_char = iter.next() orelse break;
                                             const width_char = iter.next() orelse break;
+                                            const height_char = iter.next() orelse break;
 
-                                            // TODO: only post the event if the size has changed?
+                                            _ = width_char;
-                                            // because there might be too many resize events (which force a re-draw of the entire screen)
+                                            _ = height_char;
-                                            const size: Size = .{
+                                            this.postEvent(.resize);
-                                                .rows = std.fmt.parseUnsigned(u16, height_char, 10) catch break,
+                                            // this.postEvent(.{ .size = .{
-                                                .cols = std.fmt.parseUnsigned(u16, width_char, 10) catch break,
+                                            //     .x = fmt.parseUnsigned(u16, width_char, 10) catch break,
-                                            };
+                                            //     .y = fmt.parseUnsigned(u16, height_char, 10) catch break,
-                                            if (size.cols != this.prev_size.cols or size.rows != this.prev_size.rows) {
+                                            // } });
-                                                this.postEvent(.{ .resize = size });
-                                                this.prev_size = size;
-                                            }
                                         }
                                     },
                                     'u' => {
@@ -315,25 +337,46 @@ pub fn App(comptime E: type) type {
                                     else => {},
                                 }
                             },
-                            // TODO: parse corresponding codes
+                            0x50 => {
-                            // 0x5B => parseCsi(input, &self.buf), // CSI see https://github.com/rockorager/libvaxis/blob/main/src/Parser.zig
+                                // DCS
-                            else => {},
+                            },
+                            0x58 => {
+                                // SOS
+                            },
+                            0x5D => {
+                                // OSC
+                            },
+                            // TODO parse corresponding codes
+                            0x5F => {
+                                // APC
+                                // parse for kitty graphics capabilities
+                            },
+                            else => {
+                                // alt + <char> keypress
+                                this.postEvent(.{
+                                    .key = .{
+                                        .cp = buf[1],
+                                        .mod = .{ .alt = true },
+                                    },
+                                });
+                            },
                         }
                     } else {
                         const b = buf[0];
                         const key: Key = switch (b) {
                             0x00 => .{ .cp = '@', .mod = .{ .ctrl = true } },
-                            0x08 => .{ .cp = Key.backspace },
+                            0x08 => .{ .cp = input.Backspace },
-                            0x09 => .{ .cp = Key.tab },
+                            0x09 => .{ .cp = input.Tab },
-                            0x0a, 0x0d => .{ .cp = Key.enter },
+                            0x0a => .{ .cp = 'j', .mod = .{ .ctrl = true } },
+                            0x0d => .{ .cp = input.Enter },
                             0x01...0x07, 0x0b...0x0c, 0x0e...0x1a => .{ .cp = b + 0x60, .mod = .{ .ctrl = true } },
                             0x1b => escape: {
-                                std.debug.assert(read_bytes == 1);
+                                assert(read_bytes == 1);
-                                break :escape .{ .cp = Key.escape };
+                                break :escape .{ .cp = input.Escape };
                             },
-                            0x7f => .{ .cp = Key.backspace },
+                            0x7f => .{ .cp = input.Backspace },
                             else => {
-                                var iter = terminal.code_point.Iterator{ .bytes = buf[0..read_bytes] };
+                                var iter = code_point.Iterator{ .bytes = buf[0..read_bytes] };
                                 while (iter.next()) |cp| this.postEvent(.{ .key = .{ .cp = cp.code } });
                                 continue;
                             },
@@ -345,5 +388,54 @@ pub fn App(comptime E: type) type {
                 break;
             }
         }
+
+        pub fn panic_handler(msg: []const u8, _: ?*std.builtin.StackTrace, ret_addr: ?usize) noreturn {
+            terminal.disableMouseSupport() catch {};
+            terminal.exitAltScreen() catch {};
+            terminal.showCursor() catch {};
+            var termios: posix.termios = .{
+                .iflag = .{},
+                .lflag = .{},
+                .cflag = .{},
+                .oflag = .{},
+                .cc = undefined,
+                .line = 0,
+                .ispeed = undefined,
+                .ospeed = undefined,
+            };
+            terminal.disableRawMode(&termios) catch {};
+            terminal.restoreScreen() catch {};
+            std.debug.defaultPanic(msg, ret_addr);
+        }
+
+        const element = @import("element.zig");
+        pub const Event = mergeTaggedUnions(event.SystemEvent, E);
+        pub const Container = @import("container.zig").Container(Event);
+        pub const Element = element.Element(Event);
+        pub const Alignment = element.Alignment(Event);
+        pub const Button = element.Button(Event, Queue);
+        pub const Input = element.Input(Event, Queue);
+        pub const Progress = element.Progress(Event, Queue);
+        pub const Scrollable = element.Scrollable(Event);
+        pub const Queue = queue.Queue(Event, 256);
     };
 }
+
+const log = std.log.scoped(.app);
+
+const std = @import("std");
+const mem = std.mem;
+const fmt = std.fmt;
+const posix = std.posix;
+const Thread = std.Thread;
+const assert = std.debug.assert;
+const code_point = @import("code_point");
+const event = @import("event.zig");
+const input = @import("input.zig");
+const terminal = @import("terminal.zig");
+const queue = @import("queue.zig");
+const mergeTaggedUnions = event.mergeTaggedUnions;
+const isTaggedUnion = event.isTaggedUnion;
+const Mouse = input.Mouse;
+const Key = input.Key;
+const Point = @import("point.zig").Point;

src/cell.zig

@@ -1,21 +1,66 @@
-const std = @import("std");
+//! Cell type containing content and formatting for each character in the terminal screen.
-const Style = @import("style.zig");
 
-pub const Cell = @This();
+// TODO embrace `zg` dependency more due to utf-8 encoding
-
-style: Style = .{ .attributes = &.{} },
-// TODO: embrace `zg` dependency more due to utf-8 encoding
 cp: u21 = ' ',
+style: Style = .{ .emphasis = &.{} },
 
 pub fn eql(this: Cell, other: Cell) bool {
     return this.cp == other.cp and this.style.eql(other.style);
 }
 
 pub fn reset(this: *Cell) void {
-    this.style = .{ .attributes = &.{} };
+    this.style = .{ .emphasis = &.{} };
     this.cp = ' ';
 }
 
 pub fn value(this: Cell, writer: anytype) !void {
     try this.style.value(writer, this.cp);
 }
+
+const std = @import("std");
+const Style = @import("style.zig");
+const Cell = @This();
+
+test "ascii styled text" {
+    const cells: [4]Cell = .{
+        .{ .cp = 'Y', .style = .{ .fg = .green, .bg = .grey, .emphasis = &.{} } },
+        .{ .cp = 'v', .style = .{ .emphasis = &.{ .bold, .underline } } },
+        .{ .cp = 'e', .style = .{ .emphasis = &.{.italic} } },
+        .{ .cp = 's', .style = .{ .fg = .light_green, .bg = .black, .emphasis = &.{.underline} } },
+    };
+
+    var string = std.ArrayList(u8).init(std.testing.allocator);
+    defer string.deinit();
+
+    const writer = string.writer();
+    for (cells) |cell| {
+        try cell.value(writer);
+    }
+    try std.testing.expectEqualSlices(
+        u8,
+        "\x1b[38;5;10;48;5;8;59mY\x1b[0m\x1b[39;49;59;1;4mv\x1b[0m\x1b[39;49;59;3me\x1b[0m\x1b[38;5;2;48;5;16;59;4ms\x1b[0m",
+        string.items,
+    );
+}
+
+test "utf-8 styled text" {
+    const cells: [4]Cell = .{
+        .{ .cp = '╭', .style = .{ .fg = .green, .bg = .grey, .emphasis = &.{} } },
+        .{ .cp = '─', .style = .{ .emphasis = &.{} } },
+        .{ .cp = '┄', .style = .{ .emphasis = &.{} } },
+        .{ .cp = '┘', .style = .{ .fg = .light_green, .bg = .black, .emphasis = &.{.underline} } },
+    };
+
+    var string = std.ArrayList(u8).init(std.testing.allocator);
+    defer string.deinit();
+
+    const writer = string.writer();
+    for (cells) |cell| {
+        try cell.value(writer);
+    }
+    try std.testing.expectEqualSlices(
+        u8,
+        "\x1b[38;5;10;48;5;8;59m╭\x1b[0m\x1b[39;49;59m─\x1b[0m\x1b[39;49;59m┄\x1b[0m\x1b[38;5;2;48;5;16;59;4m┘\x1b[0m",
+        string.items,
+    );
+}

src/color.zig

@@ -1,5 +1,3 @@
-const std = @import("std");
-
 pub const Color = enum(u8) {
     default = 0,
     black = 16,
@@ -18,21 +16,26 @@ pub const Color = enum(u8) {
     magenta,
     cyan,
     white,
-    // TODO: add further colors as described in https://gist.github.com/ConnerWill/d4b6c776b509add763e17f9f113fd25b # Color / Graphics Mode - 256 Colors
+    // TODO add further colors as described in https://gist.github.com/ConnerWill/d4b6c776b509add763e17f9f113fd25b # Color / Graphics Mode - 256 Colors
+
+    // TODO might be useful to use the std.ascii stuff!
 
     pub inline fn write(this: Color, writer: anytype, comptime coloring: enum { fg, bg, ul }) !void {
         if (this == .default) {
             switch (coloring) {
-                .fg => try std.fmt.format(writer, "39", .{}),
+                .fg => try format(writer, "39", .{}),
-                .bg => try std.fmt.format(writer, "49", .{}),
+                .bg => try format(writer, "49", .{}),
-                .ul => try std.fmt.format(writer, "59", .{}),
+                .ul => try format(writer, "59", .{}),
             }
         } else {
             switch (coloring) {
-                .fg => try std.fmt.format(writer, "38;5;{d}", .{@intFromEnum(this)}),
+                .fg => try format(writer, "38;5;{d}", .{@intFromEnum(this)}),
-                .bg => try std.fmt.format(writer, "48;5;{d}", .{@intFromEnum(this)}),
+                .bg => try format(writer, "48;5;{d}", .{@intFromEnum(this)}),
-                .ul => try std.fmt.format(writer, "58;5;{d}", .{@intFromEnum(this)}),
+                .ul => try format(writer, "58;5;{d}", .{@intFromEnum(this)}),
             }
         }
     }
 };
+
+const std = @import("std");
+const format = std.fmt.format;

src/ctlseqs.zig

@@ -58,8 +58,11 @@ pub const cub = "\x1b[{d}D";
 
 // Erase
 pub const erase_below_cursor = "\x1b[J";
+pub const clear_screen = "\x1b[2J";
 
 // alt screen
+pub const save_screen = "\x1b[?47h";
+pub const restore_screen = "\x1b[?47l";
 pub const smcup = "\x1b[?1049h";
 pub const rmcup = "\x1b[?1049l";
 
@@ -89,7 +92,7 @@ pub const bg_rgb_legacy = "\x1b[48;2;{d};{d};{d}m";
 pub const ul_rgb_legacy = "\x1b[58;2;{d};{d};{d}m";
 
 // Underlines
-pub const ul_off = "\x1b[24m"; // NOTE: this could be \x1b[4:0m but is not as widely supported
+pub const ul_off = "\x1b[24m"; // NOTE this could be \x1b[4:0m but is not as widely supported
 pub const ul_single = "\x1b[4m";
 pub const ul_double = "\x1b[4:2m";
 pub const ul_curly = "\x1b[4:3m";

src/error.zig

@@ -0,0 +1,4 @@
+pub const Error = error{
+    /// Thrown when a `Container` is too small to be rendered in the current screen part.
+    TooSmall,
+};

src/event.zig

@@ -1,30 +1,28 @@
 //! Events which are defined by the library. They might be extended by user
 //! events. See `App` for more details about user defined events.
-const std = @import("std");
-const terminal = @import("terminal.zig");
-
-const Size = @import("size.zig").Size;
-const Key = @import("key.zig");
 
 /// System events available to every `zterm.App`
 pub const SystemEvent = union(enum) {
     /// Initialize event, which is send once at the beginning of the event loop and before the first render loop
-    /// TODO: not sure if this is necessary or if there is an actual usecase for this - for now it will remain
+    /// TODO not sure if this is necessary or if there is an actual usecase for this - for now it will remain
     init,
     /// Quit event to signify the end of the event loop (rendering should stop afterwards)
     quit,
+    /// Resize event to signify that the application should re-draw to resize
+    resize,
     /// Error event to notify other containers about a recoverable error
     err: struct {
+        /// actual error
         err: anyerror,
         /// associated error message
         msg: []const u8,
     },
-    /// Resize event emitted by the terminal to derive the `Size` of the current terminal the application is rendered in
-    resize: Size,
     /// Input key event received from the user
     key: Key,
+    /// Mouse input event
+    mouse: Mouse,
     /// Focus event for mouse interaction
-    /// TODO: this should instead be a union with a `Size` to derive which container / element the focus meant for
+    /// TODO this should instead be a union with a `Size` to derive which container / element the focus meant for
     focus: bool,
 };
 
@@ -90,3 +88,10 @@ pub fn isTaggedUnion(comptime E: type) bool {
     }
     return true;
 }
+
+const std = @import("std");
+const input = @import("input.zig");
+const terminal = @import("terminal.zig");
+const Key = input.Key;
+const Mouse = input.Mouse;
+const Point = @import("point.zig").Point;

src/input.zig

@@ -0,0 +1,215 @@
+//! Input module for `zterm`. Contains structs to represent key events and mouse events.
+
+pub const Mouse = packed struct {
+    x: u16,
+    y: u16,
+    button: Button,
+    kind: Kind,
+
+    pub const Button = enum(u8) {
+        left,
+        middle,
+        right,
+        none,
+        wheel_up = 64,
+        wheel_down = 65,
+        wheel_right = 66,
+        wheel_left = 67,
+        button_8 = 128,
+        button_9 = 129,
+        button_10 = 130,
+        button_11 = 131,
+    };
+
+    pub const Kind = enum(u2) {
+        press,
+        release,
+        motion,
+        drag,
+    };
+
+    pub fn eql(this: @This(), other: @This()) bool {
+        return meta.eql(this, other);
+    }
+
+    pub fn in(this: @This(), origin: Point, size: Point) bool {
+        return this.x >= origin.x and this.x < size.x + origin.x and
+            this.y >= origin.y and this.y < size.y + origin.y;
+    }
+};
+
+pub const Key = packed struct {
+    cp: u21,
+    mod: Modifier = .{},
+
+    pub const Modifier = packed struct {
+        shift: bool = false,
+        alt: bool = false,
+        ctrl: bool = false,
+    };
+
+    /// Compare _this_ `Key` with an _other_ `Key`.
+    ///
+    /// # Example
+    ///
+    /// Configure `ctrl+c` to quit the application (done in main event loop of the application):
+    ///
+    /// ```zig
+    /// switch (event) {
+    ///     .quit => break,
+    ///     .key => |key| if (key.eql(.{ .cp = 'c', .mod = .{ .ctrl = true } })) app.quit.set(),
+    ///     else => {},
+    /// }
+    /// ```
+    pub fn eql(this: @This(), other: @This()) bool {
+        return meta.eql(this, other);
+    }
+
+    // TODO might be useful to use the std.ascii stuff!
+
+    /// Determine if the `Key` is an ascii character that can be printed to
+    /// the screen. This means that the code point of the `Key` is an ascii
+    /// character between 32 - 255 (with the exception of 127 = Delete) and no
+    /// modifiers (alt and/or ctrl) are used.
+    ///
+    /// # Example
+    ///
+    /// Get user input's from the .key event from the application event loop:
+    ///
+    /// ```zig
+    /// switch (event) {
+    ///   .key => |key| if (key.isAscii()) try this.input.append(key.cp),
+    ///   else => {},
+    /// }
+    /// ```
+    pub fn isAscii(this: @This()) bool {
+        return this.mod.alt == false and this.mod.ctrl == false and // no modifier keys
+            (this.cp >= 32 and this.cp <= 126 or // ascii printable characters (except for input.Delete)
+                this.cp >= 128 and this.cp <= 255); // extended ascii codes
+    }
+
+    test "isAscii with ascii character" {
+        try testing.expectEqual(true, isAscii(.{ .cp = 'c' }));
+        try testing.expectEqual(false, isAscii(.{ .cp = 'c', .mod = .{ .ctrl = true } }));
+        try testing.expectEqual(false, isAscii(.{ .cp = 'c', .mod = .{ .alt = true } }));
+        try testing.expectEqual(false, isAscii(.{ .cp = 'c', .mod = .{ .alt = true, .ctrl = true } }));
+    }
+
+    test "isAscii with non-ascii character" {
+        try testing.expectEqual(false, isAscii(.{ .cp = Escape }));
+        try testing.expectEqual(false, isAscii(.{ .cp = Enter }));
+        try testing.expectEqual(false, isAscii(.{ .cp = Enter, .mod = .{ .alt = true } }));
+    }
+
+    test "isAscii with excluded input.Delete" {
+        try testing.expectEqual(false, isAscii(.{ .cp = Delete }));
+        try testing.expectEqual(false, isAscii(.{ .cp = Delete, .mod = .{ .alt = false, .ctrl = false } }));
+    }
+};
+
+// TODO: std.ascii has the escape codes too!
+// codepoints for keys
+pub const Tab: u21 = 0x09;
+pub const Enter: u21 = 0x0D;
+pub const Escape: u21 = 0x1B;
+pub const Space: u21 = 0x20;
+pub const Backspace: u21 = 0x7F;
+
+// kitty key encodings (re-used here)
+pub const Insert: u21 = 57348;
+pub const Delete: u21 = 57349;
+pub const Left: u21 = 57350;
+pub const Right: u21 = 57351;
+pub const Up: u21 = 57352;
+pub const Down: u21 = 57353;
+pub const PageUp: u21 = 57354;
+pub const PageDown: u21 = 57355;
+pub const Home: u21 = 57356;
+pub const End: u21 = 57357;
+pub const CapsLock: u21 = 57358;
+pub const ScrollLock: u21 = 57359;
+pub const NumLock: u21 = 57360;
+pub const PrintScreen: u21 = 57361;
+pub const Pause: u21 = 57362;
+pub const Menu: u21 = 57363;
+pub const F1: u21 = 57364;
+pub const F2: u21 = 57365;
+pub const F3: u21 = 57366;
+pub const F4: u21 = 57367;
+pub const F5: u21 = 57368;
+pub const F6: u21 = 57369;
+pub const F7: u21 = 57370;
+pub const F8: u21 = 57371;
+pub const F9: u21 = 57372;
+pub const F10: u21 = 57373;
+pub const F11: u21 = 57374;
+pub const F12: u21 = 57375;
+pub const F13: u21 = 57376;
+pub const F14: u21 = 57377;
+pub const F15: u21 = 57378;
+pub const F16: u21 = 57379;
+pub const F17: u21 = 57380;
+pub const F18: u21 = 57381;
+pub const F19: u21 = 57382;
+pub const F20: u21 = 57383;
+pub const Kp0: u21 = 57399;
+pub const Kp1: u21 = 57400;
+pub const Kp2: u21 = 57401;
+pub const Kp3: u21 = 57402;
+pub const Kp4: u21 = 57403;
+pub const Kp5: u21 = 57404;
+pub const Kp6: u21 = 57405;
+pub const Kp7: u21 = 57406;
+pub const Kp8: u21 = 57407;
+pub const Kp9: u21 = 57408;
+pub const KpDecimal: u21 = 57409;
+pub const KpDivide: u21 = 57410;
+pub const KpMultiply: u21 = 57411;
+pub const KpSubtract: u21 = 57412;
+pub const KpAdd: u21 = 57413;
+pub const KpEnter: u21 = 57414;
+pub const KpEqual: u21 = 57415;
+pub const KpSeparator: u21 = 57416;
+pub const KpLeft: u21 = 57417;
+pub const KpRight: u21 = 57418;
+pub const KpUp: u21 = 57419;
+pub const KpDown: u21 = 57420;
+pub const KpPageUp: u21 = 57421;
+pub const KpPageDown: u21 = 57422;
+pub const KpHome: u21 = 57423;
+pub const KpEnd: u21 = 57424;
+pub const KpInsert: u21 = 57425;
+pub const KpDelete: u21 = 57426;
+pub const KpBegin: u21 = 57427;
+pub const MediaPlay: u21 = 57428;
+pub const MediaPause: u21 = 57429;
+pub const MediaPlayPause: u21 = 57430;
+pub const MediaReverse: u21 = 57431;
+pub const MediaStop: u21 = 57432;
+pub const MediaFastForward: u21 = 57433;
+pub const MediaRewind: u21 = 57434;
+pub const MediaTrackNext: u21 = 57435;
+pub const MediaTrackPrevious: u21 = 57436;
+pub const MediaRecord: u21 = 57437;
+pub const LowerVolume: u21 = 57438;
+pub const RaiseVolume: u21 = 57439;
+pub const MuteVolume: u21 = 57440;
+pub const LeftShift: u21 = 57441;
+pub const LeftControl: u21 = 57442;
+pub const LeftAlt: u21 = 57443;
+pub const LeftSuper: u21 = 57444;
+pub const LeftHyper: u21 = 57445;
+pub const LeftMeta: u21 = 57446;
+pub const RightShift: u21 = 57447;
+pub const RightControl: u21 = 57448;
+pub const RightAlt: u21 = 57449;
+pub const RightSuper: u21 = 57450;
+pub const RightHyper: u21 = 57451;
+pub const RightMeta: u21 = 57452;
+pub const IsoLevel3Shift: u21 = 57453;
+pub const IsoLevel5Shift: u21 = 57454;
+
+const std = @import("std");
+const meta = std.meta;
+const Point = @import("point.zig").Point;
+const testing = std.testing;

src/key.zig

@@ -1,151 +0,0 @@
-//! Keybindings and Modifiers for user input detection and selection.
-const std = @import("std");
-
-pub const Key = @This();
-
-pub const Modifier = struct {
-    shift: bool = false,
-    alt: bool = false,
-    ctrl: bool = false,
-};
-
-cp: u21,
-mod: Modifier = .{},
-
-/// Compare _this_ `Key` with an _other_ `Key`.
-///
-/// # Example
-///
-/// Configure `ctrl+c` to quit the application (done in main event loop of the application):
-///
-/// ```zig
-/// switch (event) {
-///     .quit => break,
-///     .key => |key| {
-///         // ctrl+c to quit
-///         if (terminal.Key.matches(key, .{ .cp = 'c', .mod = .{ .ctrl = true } })) {
-///             app.quit.set();
-///         }
-///     },
-///     else => {},
-/// }
-/// ```
-pub fn matches(this: @This(), other: @This()) bool {
-    return std.meta.eql(this, other);
-}
-
-// codepoints for keys
-pub const tab: u21 = 0x09;
-pub const enter: u21 = 0x0D;
-pub const escape: u21 = 0x1B;
-pub const space: u21 = 0x20;
-pub const backspace: u21 = 0x7F;
-
-// kitty key encodings (re-used here)
-pub const insert: u21 = 57348;
-pub const delete: u21 = 57349;
-pub const left: u21 = 57350;
-pub const right: u21 = 57351;
-pub const up: u21 = 57352;
-pub const down: u21 = 57353;
-pub const page_up: u21 = 57354;
-pub const page_down: u21 = 57355;
-pub const home: u21 = 57356;
-pub const end: u21 = 57357;
-pub const caps_lock: u21 = 57358;
-pub const scroll_lock: u21 = 57359;
-pub const num_lock: u21 = 57360;
-pub const print_screen: u21 = 57361;
-pub const pause: u21 = 57362;
-pub const menu: u21 = 57363;
-pub const f1: u21 = 57364;
-pub const f2: u21 = 57365;
-pub const f3: u21 = 57366;
-pub const f4: u21 = 57367;
-pub const f5: u21 = 57368;
-pub const f6: u21 = 57369;
-pub const f7: u21 = 57370;
-pub const f8: u21 = 57371;
-pub const f9: u21 = 57372;
-pub const f10: u21 = 57373;
-pub const f11: u21 = 57374;
-pub const f12: u21 = 57375;
-pub const f13: u21 = 57376;
-pub const f14: u21 = 57377;
-pub const f15: u21 = 57378;
-pub const @"f16": u21 = 57379;
-pub const f17: u21 = 57380;
-pub const f18: u21 = 57381;
-pub const f19: u21 = 57382;
-pub const f20: u21 = 57383;
-pub const f21: u21 = 57384;
-pub const f22: u21 = 57385;
-pub const f23: u21 = 57386;
-pub const f24: u21 = 57387;
-pub const f25: u21 = 57388;
-pub const f26: u21 = 57389;
-pub const f27: u21 = 57390;
-pub const f28: u21 = 57391;
-pub const f29: u21 = 57392;
-pub const f30: u21 = 57393;
-pub const f31: u21 = 57394;
-pub const @"f32": u21 = 57395;
-pub const f33: u21 = 57396;
-pub const f34: u21 = 57397;
-pub const f35: u21 = 57398;
-pub const kp_0: u21 = 57399;
-pub const kp_1: u21 = 57400;
-pub const kp_2: u21 = 57401;
-pub const kp_3: u21 = 57402;
-pub const kp_4: u21 = 57403;
-pub const kp_5: u21 = 57404;
-pub const kp_6: u21 = 57405;
-pub const kp_7: u21 = 57406;
-pub const kp_8: u21 = 57407;
-pub const kp_9: u21 = 57408;
-pub const kp_decimal: u21 = 57409;
-pub const kp_divide: u21 = 57410;
-pub const kp_multiply: u21 = 57411;
-pub const kp_subtract: u21 = 57412;
-pub const kp_add: u21 = 57413;
-pub const kp_enter: u21 = 57414;
-pub const kp_equal: u21 = 57415;
-pub const kp_separator: u21 = 57416;
-pub const kp_left: u21 = 57417;
-pub const kp_right: u21 = 57418;
-pub const kp_up: u21 = 57419;
-pub const kp_down: u21 = 57420;
-pub const kp_page_up: u21 = 57421;
-pub const kp_page_down: u21 = 57422;
-pub const kp_home: u21 = 57423;
-pub const kp_end: u21 = 57424;
-pub const kp_insert: u21 = 57425;
-pub const kp_delete: u21 = 57426;
-pub const kp_begin: u21 = 57427;
-pub const media_play: u21 = 57428;
-pub const media_pause: u21 = 57429;
-pub const media_play_pause: u21 = 57430;
-pub const media_reverse: u21 = 57431;
-pub const media_stop: u21 = 57432;
-pub const media_fast_forward: u21 = 57433;
-pub const media_rewind: u21 = 57434;
-pub const media_track_next: u21 = 57435;
-pub const media_track_previous: u21 = 57436;
-pub const media_record: u21 = 57437;
-pub const lower_volume: u21 = 57438;
-pub const raise_volume: u21 = 57439;
-pub const mute_volume: u21 = 57440;
-pub const left_shift: u21 = 57441;
-pub const left_control: u21 = 57442;
-pub const left_alt: u21 = 57443;
-pub const left_super: u21 = 57444;
-pub const left_hyper: u21 = 57445;
-pub const left_meta: u21 = 57446;
-pub const right_shift: u21 = 57447;
-pub const right_control: u21 = 57448;
-pub const right_alt: u21 = 57449;
-pub const right_super: u21 = 57450;
-pub const right_hyper: u21 = 57451;
-pub const right_meta: u21 = 57452;
-pub const iso_level_3_shift: u21 = 57453;
-pub const iso_level_5_shift: u21 = 57454;

src/main.zig

@@ -1,171 +0,0 @@
-const std = @import("std");
-const zterm = @import("zterm");
-
-const App = zterm.App(union(enum) {});
-const Key = zterm.Key;
-
-const log = std.log.scoped(.default);
-
-pub const HelloWorldText = packed struct {
-    const text = "Hello World";
-
-    text_color: zterm.Color = .black,
-
-    // example function to create the interface instance for this `Element` implementation
-    pub fn element(this: *@This()) App.Element {
-        return .{
-            .ptr = this,
-            .vtable = &.{
-                .handle = handle,
-                .content = content,
-            },
-        };
-    }
-
-    // example function to render contents for a `Container`
-    fn content(ctx: *anyopaque, cells: []zterm.Cell, size: zterm.Size) !void {
-        const this: *@This() = @ptrCast(@alignCast(ctx));
-        std.debug.assert(cells.len == @as(usize, size.cols) * @as(usize, size.rows));
-
-        // NOTE: error should only be returned here in case an in-recoverable exception has occurred
-        const row = size.rows / 2;
-        const col = size.cols / 2 -| (text.len / 2);
-
-        for (0.., text) |idx, char| {
-            cells[(row * size.cols) + col + idx].style.fg = this.text_color;
-            cells[(row * size.cols) + col + idx].cp = char;
-        }
-    }
-
-    // example function to handle events for a `Container`
-    fn handle(ctx: *anyopaque, event: App.Event) !void {
-        const this: *@This() = @ptrCast(@alignCast(ctx));
-        switch (event) {
-            .init => log.debug(".init event", .{}),
-            .key => |key| {
-                if (key.matches(.{ .cp = zterm.Key.space })) {
-                    var next_color_idx = @intFromEnum(this.text_color);
-                    next_color_idx += 1;
-                    next_color_idx %= 17; // iterate over the first 16 colors (but exclude `.default` == 0)
-                    if (next_color_idx == 0) next_color_idx += 1;
-                    this.text_color = @enumFromInt(next_color_idx);
-                    log.debug("Next color: {s}", .{@tagName(this.text_color)});
-                }
-            },
-            else => {},
-        }
-    }
-};
-
-pub fn main() !void {
-    errdefer |err| log.err("Application Error: {any}", .{err});
-
-    // TODO: maybe create own allocator as some sort of arena allocator to have consistent memory usage
-    var gpa: std.heap.GeneralPurposeAllocator(.{}) = .init;
-    defer {
-        const deinit_status = gpa.deinit();
-        if (deinit_status == .leak) {
-            log.err("memory leak", .{});
-        }
-    }
-    const allocator = gpa.allocator();
-
-    var app: App = .init;
-    var renderer = zterm.Renderer.Buffered.init(allocator);
-    defer renderer.deinit();
-
-    var element_wrapper: HelloWorldText = .{};
-    const element = element_wrapper.element();
-
-    var container = try App.Container.init(allocator, .{
-        .border = .{
-            .separator = .{
-                .enabled = true,
-                .line = .double,
-            },
-        },
-        .layout = .{
-            .gap = 2,
-            .padding = .all(5),
-            .direction = .vertical,
-        },
-    }, .{});
-    var box = try App.Container.init(allocator, .{
-        .rectangle = .{ .fill = .blue },
-        .layout = .{
-            .gap = 1,
-            .direction = .vertical,
-            .padding = .vertical(1),
-        },
-    }, .{});
-    try box.append(try App.Container.init(allocator, .{
-        .rectangle = .{ .fill = .light_green },
-    }, .{}));
-    try box.append(try App.Container.init(allocator, .{
-        .rectangle = .{ .fill = .light_green },
-    }, element));
-    try box.append(try App.Container.init(allocator, .{
-        .rectangle = .{ .fill = .light_green },
-    }, .{}));
-    try container.append(box);
-    try container.append(try App.Container.init(allocator, .{
-        .border = .{
-            .color = .light_blue,
-            .sides = .vertical,
-        },
-    }, .{}));
-    try container.append(try App.Container.init(allocator, .{
-        .rectangle = .{ .fill = .blue },
-    }, .{}));
-    defer container.deinit(); // also de-initializes the children
-
-    try app.start();
-    defer app.stop() catch |err| log.err("Failed to stop application: {any}", .{err});
-
-    // event loop
-    while (true) {
-        const event = app.nextEvent();
-        log.debug("received event: {s}", .{@tagName(event)});
-
-        switch (event) {
-            .init => {
-                try container.handle(event);
-                continue; // do not render
-            },
-            .quit => break,
-            .resize => |size| try renderer.resize(size),
-            .key => |key| {
-                if (key.matches(.{ .cp = 'q' })) app.quit();
-
-                // corresponding element could even be changed from the 'outside' (not forced through the event system)
-                // event system however allows for cross element communication (i.e. broadcasting messages, etc.)
-                if (key.matches(.{ .cp = zterm.Key.escape })) element_wrapper.text_color = .black;
-
-                if (key.matches(.{ .cp = 'n', .mod = .{ .ctrl = true } })) {
-                    try app.interrupt();
-                    defer app.start() catch @panic("could not start app event loop");
-                    var child = std.process.Child.init(&.{"hx"}, allocator);
-                    _ = child.spawnAndWait() catch |err| app.postEvent(.{
-                        .err = .{
-                            .err = err,
-                            .msg = "Spawning $EDITOR failed",
-                        },
-                    });
-                }
-            },
-            // NOTE: errors could be displayed in another container in case one was received, etc. to provide the user with feedback
-            .err => |err| log.err("Received {s} with message: {s}", .{ @errorName(err.err), err.msg }),
-            else => {},
-        }
-
-        // NOTE: returned errors should be propagated back to the application
-        container.handle(event) catch |err| app.postEvent(.{
-            .err = .{
-                .err = err,
-                .msg = "Container Event handling failed",
-            },
-        });
-        try renderer.render(@TypeOf(container), &container);
-        try renderer.flush();
-    }
-}

src/point.zig

@@ -0,0 +1,60 @@
+pub const Point = packed struct {
+    x: u16 = 0,
+    y: u16 = 0,
+
+    pub fn add(a: @This(), b: @This()) @This() {
+        return .{
+            .x = a.x + b.x,
+            .y = a.y + b.y,
+        };
+    }
+
+    pub fn max(a: @This(), b: @This()) @This() {
+        return .{
+            .x = @max(a.x, b.x),
+            .y = @max(a.y, b.y),
+        };
+    }
+
+    test "adding" {
+        const testing = @import("std").testing;
+
+        const a: @This() = .{
+            .x = 10,
+            .y = 20,
+        };
+
+        const b: @This() = .{
+            .x = 20,
+            .y = 10,
+        };
+
+        try testing.expectEqual(@This(){
+            .x = 30,
+            .y = 30,
+        }, a.add(b));
+    }
+
+    test "maximum" {
+        const testing = @import("std").testing;
+
+        const a: @This() = .{
+            .x = 10,
+            .y = 20,
+        };
+
+        const b: @This() = .{
+            .x = 20,
+            .y = 10,
+        };
+
+        try testing.expectEqual(@This(){
+            .x = 20,
+            .y = 20,
+        }, a.max(b));
+    }
+};
+
+test {
+    _ = Point;
+}

src/queue.zig

@@ -1,9 +1,7 @@
 // taken from https://github.com/rockorager/libvaxis/blob/main/src/queue.zig (MIT-License)
 // with slight modifications
-const std = @import("std");
-const assert = std.debug.assert;
 
-/// Thread safe. Fixed size. Blocking push and pop.
+/// Queue implementation. Thread safe. Fixed size. Blocking push and pop. Polling through tryPop and tryPush.
 pub fn Queue(comptime T: type, comptime size: usize) type {
     return struct {
         buf: [size]T = undefined,
@@ -92,6 +90,23 @@ pub fn Queue(comptime T: type, comptime size: usize) type {
             assert(!this.isEmptyLH());
         }
 
+        pub fn lock(this: *QueueType) void {
+            this.mutex.lock();
+        }
+
+        pub fn unlock(this: *QueueType) void {
+            this.mutex.unlock();
+        }
+
+        /// Used to efficiently drain the queue
+        pub fn drain(this: *QueueType) ?T {
+            if (this.isEmptyLH()) return null;
+
+            const result = this.buf[this.mask(this.read_index)];
+            this.read_index = this.mask2(this.read_index + 1);
+            return result;
+        }
+
         fn isEmptyLH(this: QueueType) bool {
             return this.write_index == this.read_index;
         }
@@ -116,7 +131,7 @@ pub fn Queue(comptime T: type, comptime size: usize) type {
         }
 
         /// Returns the length
-        fn len(this: QueueType) usize {
+        pub fn len(this: QueueType) usize {
             const wrap_offset = 2 * this.buf.len *
                 @intFromBool(this.write_index < this.read_index);
             const adjusted_write_index = this.write_index + wrap_offset;
@@ -135,8 +150,12 @@ pub fn Queue(comptime T: type, comptime size: usize) type {
     };
 }
 
+const std = @import("std");
 const testing = std.testing;
+const assert = std.debug.assert;
+const Thread = std.Thread;
 const cfg = Thread.SpawnConfig{ .allocator = testing.allocator };
+
 test "Queue: simple push / pop" {
     var queue: Queue(u8, 16) = .{};
     queue.push(1);
@@ -146,7 +165,6 @@ test "Queue: simple push / pop" {
     try testing.expectEqual(2, queue.pop());
 }
 
-const Thread = std.Thread;
 fn testPushPop(q: *Queue(u8, 2)) !void {
     q.push(3);
     try testing.expectEqual(2, q.pop());
@@ -199,7 +217,7 @@ fn sleepyPop(q: *Queue(u8, 2)) !void {
     try Thread.yield();
     std.time.sleep(std.time.ns_per_s);
     // Finally, let that other thread go.
-    try std.testing.expectEqual(1, q.pop());
+    try testing.expectEqual(1, q.pop());
 
     // This won't continue until the other thread has had a chance to
     // put at least one item in the queue.
@@ -218,7 +236,7 @@ fn sleepyPop(q: *Queue(u8, 2)) !void {
     std.time.sleep(std.time.ns_per_s / 2);
 
     // Pop that thing and we're done.
-    try std.testing.expectEqual(2, q.pop());
+    try testing.expectEqual(2, q.pop());
 }
 
 test "Fill, block, fill, block" {
@@ -238,15 +256,15 @@ test "Fill, block, fill, block" {
 
     // Just to make sure the sleeps are yielding to this thread, make
     // sure it took at least 900ms to do the push.
-    try std.testing.expect(then - now > 900);
+    try testing.expect(then - now > 900);
 
     // This should block again, waiting for the other thread.
     queue.push(4);
 
     // And once that push has gone through, the other thread's done.
     thread.join();
-    try std.testing.expectEqual(3, queue.pop());
+    try testing.expectEqual(3, queue.pop());
-    try std.testing.expectEqual(4, queue.pop());
+    try testing.expectEqual(4, queue.pop());
 }
 
 fn sleepyPush(q: *Queue(u8, 1)) !void {
@@ -284,8 +302,8 @@ test "Drain, block, drain, block" {
 
     var queue: Queue(u8, 1) = .{};
     const thread = try Thread.spawn(cfg, sleepyPush, .{&queue});
-    try std.testing.expectEqual(1, queue.pop());
+    try testing.expectEqual(1, queue.pop());
-    try std.testing.expectEqual(2, queue.pop());
+    try testing.expectEqual(2, queue.pop());
     thread.join();
 }
 

src/render.zig

@@ -1,21 +1,14 @@
-const std = @import("std");
+//! Renderer for `zterm`.
-const terminal = @import("terminal.zig");
-
-const Cell = @import("cell.zig");
-const Position = @import("size.zig").Position;
-const Size = @import("size.zig").Size;
 
 /// Double-buffered intermediate rendering pipeline
 pub const Buffered = struct {
-    const log = std.log.scoped(.renderer_buffered);
+    allocator: Allocator,
-    // _ = log;
-    allocator: std.mem.Allocator,
     created: bool,
-    size: Size,
+    size: Point,
     screen: []Cell,
     virtual_screen: []Cell,
 
-    pub fn init(allocator: std.mem.Allocator) @This() {
+    pub fn init(allocator: Allocator) @This() {
         return .{
             .allocator = allocator,
             .created = false,
@@ -32,84 +25,107 @@ pub const Buffered = struct {
         }
     }
 
-    pub fn resize(this: *@This(), size: Size) !void {
+    pub fn resize(this: *@This()) !Point {
-        log.debug("renderer::resize", .{});
+        const size = terminal.getTerminalSize();
-        defer this.size = size;
+        if (meta.eql(this.size, size)) return this.size;
+
+        this.size = size;
+        const n = @as(usize, this.size.x) * @as(usize, this.size.y);
 
         if (!this.created) {
-            this.screen = this.allocator.alloc(Cell, @as(usize, size.cols) * @as(usize, size.rows)) catch @panic("render.zig: Out of memory.");
+            this.screen = this.allocator.alloc(Cell, n) catch @panic("render.zig: Out of memory.");
-            @memset(this.screen, .{});
+
-            this.virtual_screen = this.allocator.alloc(Cell, @as(usize, size.cols) * @as(usize, size.rows)) catch @panic("render.zig: Out of memory.");
+            this.virtual_screen = this.allocator.alloc(Cell, n) catch @panic("render.zig: Out of memory.");
             @memset(this.virtual_screen, .{});
+
             this.created = true;
         } else {
             this.allocator.free(this.screen);
-            this.screen = this.allocator.alloc(Cell, @as(usize, size.cols) * @as(usize, size.rows)) catch @panic("render.zig: Out of memory.");
+            this.screen = this.allocator.alloc(Cell, n) catch @panic("render.zig: Out of memory.");
-            @memset(this.screen, .{});
+
             this.allocator.free(this.virtual_screen);
-            this.virtual_screen = this.allocator.alloc(Cell, @as(usize, size.cols) * @as(usize, size.rows)) catch @panic("render.zig: Out of memory.");
+            this.virtual_screen = this.allocator.alloc(Cell, n) catch @panic("render.zig: Out of memory.");
             @memset(this.virtual_screen, .{});
         }
         try this.clear();
+        return size;
     }
 
     /// Clear the entire screen and reset the screen buffer, to force a re-draw with the next `flush` call.
     pub fn clear(this: *@This()) !void {
-        log.debug("renderer::clear", .{});
         try terminal.clearScreen();
         @memset(this.screen, .{});
     }
 
     /// Render provided cells at size (anchor and dimension) into the *virtual screen*.
     pub fn render(this: *@This(), comptime T: type, container: *T) !void {
-        const size: Size = container.size;
+        const size: Point = container.size;
-        const cells: []const Cell = try container.contents();
+        const origin: Point = container.origin;
+        const cells: []const Cell = try container.content();
 
         if (cells.len == 0) return;
 
         var idx: usize = 0;
         var vs = this.virtual_screen;
-        const anchor: usize = (@as(usize, size.anchor.row) * @as(usize, this.size.cols)) + @as(usize, size.anchor.col);
+        const anchor: usize = (@as(usize, origin.y) * @as(usize, this.size.x)) + @as(usize, origin.x);
 
-        blk: for (0..size.rows) |row| {
+        blk: for (0..size.y) |row| {
-            for (0..size.cols) |col| {
+            for (0..size.x) |col| {
-                const cell = cells[idx];
+                vs[anchor + (row * this.size.x) + col] = cells[idx];
                 idx += 1;
 
-                vs[anchor + (row * this.size.cols) + col].style = cell.style;
-                vs[anchor + (row * this.size.cols) + col].cp = cell.cp;
-
                 if (cells.len == idx) break :blk;
             }
         }
         // free immediately
         container.allocator.free(cells);
 
-        for (container.elements.items) |*element| {
+        for (container.elements.items) |*element| try this.render(T, element);
-            try this.render(T, element);
-        }
     }
 
     /// Write *virtual screen* to alternate screen (should be called once and last during each render loop iteration in the main loop).
     pub fn flush(this: *@This()) !void {
-        // TODO: measure timings of rendered frames?
+        try terminal.hideCursor();
-        log.debug("renderer::flush", .{});
+        // TODO measure timings of rendered frames?
+        var cursor_position: ?Point = null;
         const writer = terminal.writer();
         const s = this.screen;
         const vs = this.virtual_screen;
-        for (0..this.size.rows) |row| {
+        for (0..this.size.y) |row| {
-            for (0..this.size.cols) |col| {
+            for (0..this.size.x) |col| {
-                const idx = (row * this.size.cols) + col;
+                const idx = (row * this.size.x) + col;
                 const cs = s[idx];
                 const cvs = vs[idx];
+
+                // update the latest found cursor position
+                if (cvs.style.cursor) {
+                    assert(cursor_position == null);
+                    cursor_position = .{
+                        .x = @truncate(col),
+                        .y = @truncate(row),
+                    };
+                }
+
                 if (cs.eql(cvs)) continue;
 
                 // render differences found in virtual screen
-                try terminal.setCursorPosition(.{ .row = @truncate(row + 1), .col = @truncate(col + 1) });
+                try terminal.setCursorPosition(.{ .y = @truncate(row), .x = @truncate(col) });
                 try cvs.value(writer);
                 // update screen to be the virtual screen for the next frame
                 s[idx] = vs[idx];
             }
         }
+        if (cursor_position) |point| {
+            try terminal.showCursor();
+            try terminal.setCursorPosition(point);
+        }
     }
 };
+
+const std = @import("std");
+const meta = std.meta;
+const assert = std.debug.assert;
+const Allocator = std.mem.Allocator;
+const terminal = @import("terminal.zig");
+const Cell = @import("cell.zig");
+const Point = @import("point.zig").Point;

src/root.zig

@@ -1,10 +1,14 @@
 // private imports
 const container = @import("container.zig");
 const color = @import("color.zig");
-const size = @import("size.zig");
+const size = @import("point.zig");
 
 // public exports
+pub const input = @import("input.zig");
+pub const testing = @import("testing.zig");
+
 pub const App = @import("app.zig").App;
+pub const Error = @import("error.zig").Error;
 // App also exports further types once initialized with the user events at compile time:
 // `App.Container`
 // `App.Element`
@@ -13,21 +17,23 @@ pub const Renderer = @import("render.zig");
 // Container Configurations
 pub const Border = container.Border;
 pub const Rectangle = container.Rectangle;
-pub const Scroll = container.Scroll;
 pub const Layout = container.Layout;
 
 pub const Cell = @import("cell.zig");
 pub const Color = color.Color;
-pub const Key = @import("key.zig");
+pub const Key = input.Key;
-pub const Size = size.Size;
+pub const Mouse = input.Mouse;
+pub const Point = @import("point.zig").Point;
 pub const Style = @import("style.zig");
 
 test {
     _ = @import("terminal.zig");
+    _ = @import("container.zig");
     _ = @import("queue.zig");
+    _ = @import("error.zig");
+    _ = @import("point.zig");
 
     _ = color;
-    _ = size;
 
     _ = Cell;
     _ = Key;

src/size.zig

@@ -1,10 +0,0 @@
-pub const Size = packed struct {
-    anchor: Position = .{},
-    cols: u16 = 0,
-    rows: u16 = 0,
-};
-
-pub const Position = packed struct {
-    col: u16 = 0,
-    row: u16 = 0,
-};

src/style.zig

@@ -7,11 +7,13 @@
 
 // taken from https://github.com/rockorager/libvaxis/blob/main/src/Cell.zig (MIT-License)
 // with slight modifications
-const std = @import("std");
 
-const Color = @import("color.zig").Color;
+fg: Color = .default,
-
+bg: Color = .default,
-pub const Style = @This();
+ul: Color = .default,
+cursor: bool = false,
+ul_style: Underline = .off,
+emphasis: []const Emphasis,
 
 pub const Underline = enum {
     off,
@@ -22,7 +24,7 @@ pub const Underline = enum {
     dashed,
 };
 
-pub const Attribute = enum(u8) {
+pub const Emphasis = enum(u8) {
     reset = 0,
     bold = 1,
     dim,
@@ -34,40 +36,43 @@ pub const Attribute = enum(u8) {
     strikethrough,
 };
 
-fg: Color = .white,
-bg: Color = .default,
-ul: Color = .default,
-ul_style: Underline = .off,
-attributes: []const Attribute,
-
 pub fn eql(this: Style, other: Style) bool {
-    return std.meta.eql(this, other);
+    return meta.eql(this, other);
 }
 
+// TODO might be useful to use the std.ascii stuff!
+
 pub fn value(this: Style, writer: anytype, cp: u21) !void {
     var buffer: [4]u8 = undefined;
-    const bytes = try std.unicode.utf8Encode(cp, &buffer);
+    const bytes = try unicode.utf8Encode(cp, &buffer);
-    std.debug.assert(bytes > 0);
+    assert(bytes > 0);
     // build ansi sequence for 256 colors ...
     // foreground
-    try std.fmt.format(writer, "\x1b[", .{});
+    try format(writer, "\x1b[", .{});
     try this.fg.write(writer, .fg);
     // background
-    try std.fmt.format(writer, ";", .{});
+    try format(writer, ";", .{});
     try this.bg.write(writer, .bg);
     // underline
-    // FIX: assert that if the underline property is set that the ul style and the attribute for underlining is available
+    // FIX assert that if the underline property is set that the ul style and the attribute for underlining is available
-    try std.fmt.format(writer, ";", .{});
+    try format(writer, ";", .{});
     try this.ul.write(writer, .ul);
     // append styles (aka attributes like bold, italic, strikethrough, etc.)
-    for (this.attributes) |attribute| {
+    for (this.emphasis) |attribute| try format(writer, ";{d}", .{@intFromEnum(attribute)});
-        try std.fmt.format(writer, ";{d}", .{@intFromEnum(attribute)});
+    try format(writer, "m", .{});
-    }
-    try std.fmt.format(writer, "m", .{});
     // content
-    try std.fmt.format(writer, "{s}", .{buffer});
+    try format(writer, "{s}", .{buffer[0..bytes]});
+    try format(writer, "\x1b[0m", .{});
 }
 
-// TODO: implement helper functions for terminal capabilities:
+// TODO implement helper functions for terminal capabilities:
 // - links / url display (osc 8)
 // - show / hide cursor?
+
+const std = @import("std");
+const unicode = std.unicode;
+const meta = std.meta;
+const assert = std.debug.assert;
+const format = std.fmt.format;
+const Color = @import("color.zig").Color;
+const Style = @This();

src/terminal.zig

@@ -1,13 +1,3 @@
-const std = @import("std");
-pub const code_point = @import("code_point");
-
-const Key = @import("key.zig");
-const Position = @import("size.zig").Position;
-const Size = @import("size.zig").Size;
-const Cell = @import("cell.zig");
-
-const log = std.log.scoped(.terminal);
-
 // Ref: https://vt100.net/docs/vt510-rm/DECRPM.html
 pub const ReportMode = enum {
     not_recognized,
@@ -19,54 +9,62 @@ pub const ReportMode = enum {
 
 /// Gets number of rows and columns in the terminal
 pub fn getTerminalSize() Size {
-    var ws: std.posix.winsize = undefined;
+    var ws: posix.winsize = undefined;
-    _ = std.posix.system.ioctl(std.posix.STDIN_FILENO, std.posix.T.IOCGWINSZ, @intFromPtr(&ws));
+    _ = posix.system.ioctl(posix.STDIN_FILENO, posix.T.IOCGWINSZ, @intFromPtr(&ws));
-    return .{ .cols = ws.col, .rows = ws.row };
+    return .{ .x = ws.col, .y = ws.row };
 }
 
 pub fn saveScreen() !void {
-    _ = try std.posix.write(std.posix.STDIN_FILENO, "\x1b[?47h");
+    _ = try posix.write(posix.STDIN_FILENO, ctlseqs.save_screen);
 }
 
 pub fn restoreScreen() !void {
-    _ = try std.posix.write(std.posix.STDIN_FILENO, "\x1b[?47l");
+    _ = try posix.write(posix.STDIN_FILENO, ctlseqs.restore_screen);
 }
 
 pub fn enterAltScreen() !void {
-    _ = try std.posix.write(std.posix.STDIN_FILENO, "\x1b[?1049h");
+    _ = try posix.write(posix.STDIN_FILENO, ctlseqs.smcup);
 }
 
 pub fn exitAltScreen() !void {
-    _ = try std.posix.write(std.posix.STDIN_FILENO, "\x1b[?1049l");
+    _ = try posix.write(posix.STDIN_FILENO, ctlseqs.rmcup);
 }
 
 pub fn clearScreen() !void {
-    _ = try std.posix.write(std.posix.STDIN_FILENO, "\x1b[2J");
+    _ = try posix.write(posix.STDIN_FILENO, ctlseqs.clear_screen);
 }
 
 pub fn hideCursor() !void {
-    _ = try std.posix.write(std.posix.STDIN_FILENO, "\x1b[?25l");
+    _ = try posix.write(posix.STDIN_FILENO, ctlseqs.hide_cursor);
 }
 
 pub fn showCursor() !void {
-    _ = try std.posix.write(std.posix.STDIN_FILENO, "\x1b[?25h");
+    _ = try posix.write(posix.STDIN_FILENO, ctlseqs.show_cursor);
 }
 
 pub fn setCursorPositionHome() !void {
-    _ = try std.posix.write(std.posix.STDIN_FILENO, "\x1b[H");
+    _ = try posix.write(posix.STDIN_FILENO, ctlseqs.home);
+}
+
+pub fn enableMouseSupport() !void {
+    _ = try posix.write(posix.STDIN_FILENO, ctlseqs.mouse_set);
+}
+
+pub fn disableMouseSupport() !void {
+    _ = try posix.write(posix.STDIN_FILENO, ctlseqs.mouse_reset);
 }
 
 pub fn read(buf: []u8) !usize {
-    return try std.posix.read(std.posix.STDIN_FILENO, buf);
+    return try posix.read(posix.STDIN_FILENO, buf);
 }
 
 pub fn write(buf: []const u8) !usize {
-    return try std.posix.write(std.posix.STDIN_FILENO, buf);
+    return try posix.write(posix.STDIN_FILENO, buf);
 }
 
 fn contextWrite(context: @This(), data: []const u8) anyerror!usize {
     _ = context;
-    return try std.posix.write(std.posix.STDOUT_FILENO, data);
+    return try posix.write(posix.STDOUT_FILENO, data);
 }
 
 const Writer = std.io.Writer(
@@ -79,21 +77,21 @@ pub fn writer() Writer {
     return .{ .context = .{} };
 }
 
-pub fn setCursorPosition(pos: Position) !void {
+pub fn setCursorPosition(pos: Point) !void {
     var buf: [64]u8 = undefined;
-    const value = try std.fmt.bufPrint(&buf, "\x1b[{d};{d}H", .{ pos.row, pos.col });
+    const value = try std.fmt.bufPrint(&buf, "\x1b[{d};{d}H", .{ pos.y + 1, pos.x + 1 });
-    _ = try std.posix.write(std.posix.STDIN_FILENO, value);
+    _ = try posix.write(posix.STDIN_FILENO, value);
 }
 
 pub fn getCursorPosition() !Size.Position {
     // Needs Raw mode (no wait for \n) to work properly cause
     // control sequence will not be written without it.
-    _ = try std.posix.write(std.posix.STDIN_FILENO, "\x1b[6n");
+    _ = try posix.write(posix.STDIN_FILENO, "\x1b[6n");
 
     var buf: [64]u8 = undefined;
 
     // format: \x1b, "[", R1,..., Rn, ";", C1, ..., Cn, "R"
-    const len = try std.posix.read(std.posix.STDIN_FILENO, &buf);
+    const len = try posix.read(posix.STDIN_FILENO, &buf);
 
     if (!isCursorPosition(buf[0..len])) {
         return error.InvalidValueReturned;
@@ -127,8 +125,8 @@ pub fn getCursorPosition() !Size.Position {
     }
 
     return .{
-        .row = try std.fmt.parseInt(u16, row[0..ridx], 10) - 1,
+        .x = try std.fmt.parseInt(u16, col[0..cidx], 10) - 1,
-        .col = try std.fmt.parseInt(u16, col[0..cidx], 10) - 1,
+        .y = try std.fmt.parseInt(u16, row[0..ridx], 10) - 1,
     };
 }
 
@@ -156,8 +154,8 @@ pub fn isCursorPosition(buf: []u8) bool {
 ///
 /// `bak`: pointer to store termios struct backup before
 /// altering, this is used to disable raw mode.
-pub fn enableRawMode(bak: *std.posix.termios) !void {
+pub fn enableRawMode(bak: *posix.termios) !void {
-    var termios = try std.posix.tcgetattr(std.posix.STDIN_FILENO);
+    var termios = try posix.tcgetattr(posix.STDIN_FILENO);
     bak.* = termios;
 
     // termios flags used by termios(3)
@@ -182,20 +180,20 @@ pub fn enableRawMode(bak: *std.posix.termios) !void {
     termios.cflag.CSIZE = .CS8;
     termios.cflag.PARENB = false;
 
-    termios.cc[@intFromEnum(std.posix.V.MIN)] = 1;
+    termios.cc[@intFromEnum(posix.V.MIN)] = 1;
-    termios.cc[@intFromEnum(std.posix.V.TIME)] = 0;
+    termios.cc[@intFromEnum(posix.V.TIME)] = 0;
 
-    try std.posix.tcsetattr(
+    try posix.tcsetattr(
-        std.posix.STDIN_FILENO,
+        posix.STDIN_FILENO,
         .FLUSH,
         termios,
     );
 }
 
 /// Reverts `enableRawMode` to restore initial functionality.
-pub fn disableRawMode(bak: *std.posix.termios) !void {
+pub fn disableRawMode(bak: *posix.termios) !void {
-    try std.posix.tcsetattr(
+    try posix.tcsetattr(
-        std.posix.STDIN_FILENO,
+        posix.STDIN_FILENO,
         .FLUSH,
         bak.*,
     );
@@ -205,13 +203,13 @@ pub fn disableRawMode(bak: *std.posix.termios) !void {
 pub fn canSynchornizeOutput() !bool {
     // Needs Raw mode (no wait for \n) to work properly cause
     // control sequence will not be written without it.
-    _ = try std.posix.write(std.posix.STDIN_FILENO, "\x1b[?2026$p");
+    _ = try posix.write(posix.STDIN_FILENO, "\x1b[?2026$p");
 
     var buf: [64]u8 = undefined;
 
     // format: \x1b, "[", "?", "2", "0", "2", "6", ";", n, "$", "y"
-    const len = try std.posix.read(std.posix.STDIN_FILENO, &buf);
+    const len = try posix.read(posix.STDIN_FILENO, &buf);
-    if (!std.mem.eql(u8, buf[0..len], "\x1b[?2026;") or len < 9) {
+    if (!mem.eql(u8, buf[0..len], "\x1b[?2026;") or len < 9) {
         return false;
     }
 
@@ -228,3 +226,16 @@ fn getReportMode(ps: u8) ReportMode {
         else => ReportMode.not_recognized,
     };
 }
+
+const log = std.log.scoped(.terminal);
+
+const std = @import("std");
+const mem = std.mem;
+const posix = std.posix;
+const code_point = @import("code_point");
+const ctlseqs = @import("ctlseqs.zig");
+const input = @import("input.zig");
+const Key = input.Key;
+const Point = @import("point.zig").Point;
+const Size = @import("point.zig").Point;
+const Cell = @import("cell.zig");

src/test/container/border.all.zon

@@ -0,0 +1 @@
+.{.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9484},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9472},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9488},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9474},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.empLine truncated

src/test/container/border.horizontal.zon

@@ -0,0 +1 @@
+.{.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9474},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9474},.{.style=.{.fg=.green,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=9474},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.emphasis=.{}},.cp=32},.{.style=.{.fg=.default,.bg=.default,.ul=.default,.ul_style=.off,.empLine truncated

src/test/container/border.vertical.zon

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src/test/element/scrollable.vertical.bottom.zon

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src/test/element/scrollable.vertical.scrollbar.bottom.zon

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src/test/element/scrollable.vertical.scrollbar.top.zon

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src/test/element/scrollable.vertical.top.zon

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src/testing.zig

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+//! Testing namespace for `zterm` to provide testing capabilities for `Containers`, `Event` handling, `App`s and `Element` implementations.
+
+/// Single-buffer test rendering pipeline for testing purposes.
+pub const Renderer = struct {
+    allocator: Allocator,
+    size: Point,
+    screen: []Cell,
+
+    pub fn init(allocator: Allocator, size: Point) @This() {
+        const screen = allocator.alloc(Cell, @as(usize, size.x) * @as(usize, size.y)) catch @panic("testing.zig: Out of memory.");
+        @memset(screen, .{});
+
+        return .{
+            .allocator = allocator,
+            .size = size,
+            .screen = screen,
+        };
+    }
+
+    pub fn deinit(this: *@This()) void {
+        this.allocator.free(this.screen);
+    }
+
+    pub fn resize(this: *@This(), size: Point) !void {
+        this.size = size;
+        const n = @as(usize, size.x) * @as(usize, size.y);
+
+        this.allocator.free(this.screen);
+        this.screen = this.allocator.alloc(Cell, n) catch @panic("testing.zig: Out of memory.");
+        @memset(this.screen, .{});
+    }
+
+    pub fn clear(this: *@This()) !void {
+        @memset(this.screen, .{});
+    }
+
+    pub fn render(this: *@This(), comptime T: type, container: *const T) !void {
+        const size: Point = container.size;
+        const origin: Point = container.origin;
+        const cells: []const Cell = try container.content();
+
+        if (cells.len == 0) return;
+
+        var idx: usize = 0;
+        const anchor = (@as(usize, origin.y) * @as(usize, this.size.x)) + @as(usize, origin.x);
+
+        blk: for (0..size.y) |row| {
+            for (0..size.x) |col| {
+                const cell = cells[idx];
+                idx += 1;
+
+                this.screen[anchor + (row * this.size.x) + col].style = cell.style;
+                this.screen[anchor + (row * this.size.x) + col].cp = cell.cp;
+
+                if (cells.len == idx) break :blk;
+            }
+        }
+        // free immediately
+        container.allocator.free(cells);
+
+        for (container.elements.items) |*element| try this.render(T, element);
+    }
+
+    pub fn save(this: @This(), writer: anytype) !void {
+        try std.zon.stringify.serialize(this.screen, .{ .whitespace = false }, writer);
+    }
+};
+
+/// This function is intended to be used only in tests. Test if a `Container`'s
+/// rendered contents are equal to the expected `Cell` slice.
+///
+/// # Test data creation
+///
+/// Create a .zon file containing the expected `Cell` slice using the `zterm.testing.Renderer.save` method:
+///
+/// ```zig
+/// const file = try std.fs.cwd().createFile("test/container/border/all.zon", .{ .truncate = true });
+/// defer file.close();
+///
+/// const allocator = std.testing.allocator;
+/// var renderer: testing.Renderer = .init(allocator, size);
+/// defer renderer.deinit();
+///
+/// try container.handle(.{ .size = size });
+/// try renderer.render(Container(event.SystemEvent), &container);
+/// try renderer.save(file.writer());
+/// ```
+///
+/// # Testing against created data
+///
+/// Then later load that .zon file at compile time and run your test against this `Cell` slice.
+///
+/// ```zig
+/// var container: Container(event.SystemEvent) = try .init(std.testing.allocator, .{
+///     .border = .{
+///         .color = .green,
+///         .sides = .all,
+///     },
+/// }, .{});
+/// defer container.deinit();
+///
+/// try testing.expectContainerScreen(.{
+///     .rows = 20,
+///     .cols = 30,
+/// }, &container, @import("test/container/border.all.zon"));
+/// ```
+pub fn expectContainerScreen(size: Point, container: *Container(event.SystemEvent), expected: []const Cell) !void {
+    const allocator = testing.allocator;
+    var renderer: Renderer = .init(allocator, size);
+    defer renderer.deinit();
+
+    container.resize(size);
+    container.reposition(.{});
+    try renderer.render(Container(event.SystemEvent), container);
+
+    try expectEqualCells(.{}, renderer.size, expected, renderer.screen);
+}
+
+/// This function is intended to be used only in tests. Test if the two
+/// provided cell arrays are identical. Usually the `Cell` slices are
+/// the contents of a given screen from the `zterm.testing.Renderer`. See
+/// `zterm.testing.expectContainerScreen` for an example usage.
+pub fn expectEqualCells(origin: Point, size: Point, expected: []const Cell, actual: []const Cell) !void {
+    const allocator = testing.allocator;
+
+    try testing.expectEqual(expected.len, actual.len);
+    try testing.expectEqual(expected.len, @as(usize, size.y) * @as(usize, size.x));
+
+    var expected_cps = try std.ArrayList(Cell).initCapacity(allocator, size.x);
+    defer expected_cps.deinit();
+
+    var actual_cps = try std.ArrayList(Cell).initCapacity(allocator, size.x);
+    defer actual_cps.deinit();
+
+    var output = try std.ArrayList(u8).initCapacity(allocator, expected_cps.capacity * actual_cps.capacity + 5 * size.y);
+    defer output.deinit();
+
+    var buffer = std.io.bufferedWriter(output.writer());
+    defer buffer.flush() catch {};
+
+    const writer = buffer.writer();
+    var differ = false;
+
+    const dwd = try DisplayWidth.DisplayWidthData.init(allocator);
+    defer dwd.deinit();
+    const dw: DisplayWidth = .{ .data = &dwd };
+
+    const expected_centered = try dw.center(allocator, "Expected Screen", size.x, " ");
+    defer allocator.free(expected_centered);
+
+    const actual_centered = try dw.center(allocator, "Actual Screen", size.x, " ");
+    defer allocator.free(actual_centered);
+
+    try writer.print("Screens are not equivalent.\n{s} ┆ {s}\n", .{ expected_centered, actual_centered });
+
+    for (origin.y..size.y) |row| {
+        defer {
+            expected_cps.clearRetainingCapacity();
+            actual_cps.clearRetainingCapacity();
+        }
+        for (origin.x..size.x) |col| {
+            const expected_cell = expected[(row * size.x) + col];
+            const actual_cell = actual[(row * size.x) + col];
+
+            if (!expected_cell.eql(actual_cell)) differ = true;
+
+            try expected_cps.append(expected_cell);
+            try actual_cps.append(actual_cell);
+        }
+
+        // write screens both formatted to buffer
+        for (expected_cps.items) |cell| try cell.value(writer);
+        _ = try writer.write(" ┆ ");
+        for (actual_cps.items) |cell| try cell.value(writer);
+        _ = try writer.write("\n");
+    }
+
+    if (!differ) return;
+
+    // test failed
+    try buffer.flush();
+
+    debug.lockStdErr();
+    defer debug.unlockStdErr();
+
+    const std_writer = std.io.getStdErr().writer();
+    try std_writer.writeAll(output.items);
+    return error.TestExpectEqualCells;
+}
+
+const std = @import("std");
+const debug = std.debug;
+const testing = std.testing;
+const Allocator = std.mem.Allocator;
+const event = @import("event.zig");
+const Container = @import("container.zig").Container;
+const Cell = @import("cell.zig");
+const DisplayWidth = @import("DisplayWidth");
+const Point = @import("point.zig").Point;