ref(examples): avoid unnecessary casts

examples/elements/button.zig

@@ -34,8 +34,8 @@ pub const Clickable = struct {
         _ = ctx;
         std.debug.assert(cells.len == @as(usize, size.cols) * @as(usize, size.rows));
 
-        const row: u16 = size.rows / 2 -| @as(u16, @truncate(text.len / 2));
-        const col: u16 = size.cols / 2 -| @as(u16, @truncate(text.len / 2));
+        const row = size.rows / 2 -| (text.len / 2);
+        const col = size.cols / 2 -| (text.len / 2);
         const anchor = (row * size.cols) + col;
 
         for (text, 0..) |cp, idx| {

examples/elements/input.zig

@@ -54,8 +54,8 @@ pub const InputField = struct {
 
         if (this.input.items.len == 0) return;
 
-        const row: u16 = 1;
-        const col: u16 = 1;
+        const row = 1;
+        const col = 1;
         const anchor = (row * size.cols) + col;
 
         for (this.input.items, 0..) |cp, idx| {

examples/elements/scrollable.zig

@@ -9,48 +9,25 @@ 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,
-            },
+            .vtable = &.{ .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));
+        _ = 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);
+        const anchor = (row * size.rows) + col;
 
         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.eql(.{ .cp = input.Space })) {
-                var next_color_idx = @intFromEnum(this.text_color);
-                next_color_idx += 1;
-                next_color_idx %= 17;
-                if (next_color_idx == @intFromEnum(zterm.Color.default)) next_color_idx += 1;
-                this.text_color = @enumFromInt(next_color_idx);
-                log.debug("Next color: {s}", .{@tagName(this.text_color)});
-            },
-            else => {},
+            cells[anchor + idx].style.fg = .black;
+            cells[anchor + idx].cp = char;
         }
     }
 };

examples/layouts/grid.zig

@@ -11,7 +11,6 @@ const QuitText = struct {
     pub fn element(this: *@This()) App.Element {
         return .{
             .ptr = this,
-            // no handle function required
             .vtable = &.{ .content = content },
         };
     }
@@ -20,8 +19,8 @@ const QuitText = struct {
         _ = ctx;
         std.debug.assert(cells.len == @as(usize, size.cols) * @as(usize, size.rows));
 
-        const row: u16 = 2;
-        const col: u16 = size.cols / 2 -| (@as(u16, @truncate(text.len)) / 2);
+        const row = 2;
+        const col = size.cols / 2 -| (text.len / 2);
         const anchor = (row * size.cols) + col;
 
         for (text, 0..) |cp, idx| {

examples/layouts/horizontal.zig

@@ -11,7 +11,6 @@ const QuitText = struct {
     pub fn element(this: *@This()) App.Element {
         return .{
             .ptr = this,
-            // no handle function required
             .vtable = &.{ .content = content },
         };
     }
@@ -20,8 +19,8 @@ const QuitText = struct {
         _ = ctx;
         std.debug.assert(cells.len == @as(usize, size.cols) * @as(usize, size.rows));
 
-        const row: u16 = 2;
-        const col: u16 = size.cols / 2 -| (@as(u16, @truncate(text.len)) / 2);
+        const row = 2;
+        const col = size.cols / 2 -| (text.len / 2);
         const anchor = (row * size.cols) + col;
 
         for (text, 0..) |cp, idx| {

examples/layouts/mixed.zig

@@ -11,7 +11,6 @@ const QuitText = struct {
     pub fn element(this: *@This()) App.Element {
         return .{
             .ptr = this,
-            // no handle function required
             .vtable = &.{ .content = content },
         };
     }
@@ -20,8 +19,8 @@ const QuitText = struct {
         _ = ctx;
         std.debug.assert(cells.len == @as(usize, size.cols) * @as(usize, size.rows));
 
-        const row: u16 = 2;
-        const col: u16 = size.cols / 2 -| (@as(u16, @truncate(text.len)) / 2);
+        const row = 2;
+        const col = size.cols / 2 -| (text.len / 2);
         const anchor = (row * size.cols) + col;
 
         for (text, 0..) |cp, idx| {

examples/layouts/vertical.zig

@@ -11,7 +11,6 @@ const QuitText = struct {
     pub fn element(this: *@This()) App.Element {
         return .{
             .ptr = this,
-            // no handle function required
             .vtable = &.{ .content = content },
         };
     }
@@ -20,8 +19,8 @@ const QuitText = struct {
         _ = ctx;
         std.debug.assert(cells.len == @as(usize, size.cols) * @as(usize, size.rows));
 
-        const row: u16 = 2;
-        const col: u16 = size.cols / 2 -| (@as(u16, @truncate(text.len)) / 2);
+        const row = 2;
+        const col = size.cols / 2 -| (text.len / 2);
         const anchor = (row * size.cols) + col;
 
         for (text, 0..) |cp, idx| {