mod(tui): create own terminal interface framework

src/layout/Pane.zig

@@ -2,37 +2,42 @@ const std = @import("std");
 const lib_event = @import("../event.zig");
 const widget = @import("../widget.zig");
 
-pub fn Layout(comptime E: type) type {
-    if (!lib_event.isTaggedUnion(E)) {
-        @compileError("Provided user event `E` for `Layout(comptime E: type)` is not of type `union(enum)`.");
+pub fn Layout(comptime Event: type) type {
+    if (!lib_event.isTaggedUnion(Event)) {
+        @compileError("Provided user event `Event` for `Layout(comptime Event: type)` is not of type `union(enum)`.");
     }
     return struct {
-        pub const Event = lib_event.MergeTaggedUnions(lib_event.BuiltinEvent, E);
-
-        w: widget.Widget(E) = undefined,
+        w: widget.Widget(Event) = undefined,
+        events: std.ArrayList(Event) = undefined,
         c: std.ArrayList(u8) = undefined,
 
-        pub fn init(allocator: std.mem.Allocator, w: widget.Widget(E)) @This() {
+        pub fn init(allocator: std.mem.Allocator, w: widget.Widget(Event)) @This() {
             return .{
                 .w = w,
+                .events = std.ArrayList(Event).init(allocator),
                 .c = std.ArrayList(u8).init(allocator),
             };
         }
 
         pub fn deinit(this: *@This()) void {
             this.w.deinit();
+            this.events.deinit();
             this.c.deinit();
             this.* = undefined;
         }
 
-        pub fn handle(this: *@This(), event: Event) Event {
-            return this.w.handle(event);
+        pub fn handle(this: *@This(), event: Event) !*std.ArrayList(Event) {
+            this.events.clearRetainingCapacity();
+            if (this.w.handle(event)) |e| {
+                try this.events.append(e);
+            }
+            return &this.events;
         }
 
-        pub fn content(this: *@This()) *std.ArrayList(u8) {
-            const widget_content = this.w.content();
+        pub fn content(this: *@This()) !*std.ArrayList(u8) {
+            const widget_content = try this.w.content();
             this.c.clearRetainingCapacity();
-            this.c.appendSlice(widget_content.items) catch @panic("OOM");
+            try this.c.appendSlice(widget_content.items);
             return &this.c;
         }
     };