add(View): enable and disable interface functions

src/view.zig

@@ -23,12 +23,17 @@ pub fn View(comptime Event: type, comptime Renderer: type) type {
         pub const Interface = @import("interface").Interface(.{
             .handle = fn (anytype, Event) anyerror!*Events,
             .render = fn (anytype, *Renderer) anyerror!void,
+            .enable = fn (anytype) void,
+            .disable = fn (anytype) void,
             .deinit = fn (anytype) void,
         }, .{});
 
+        // TODO: this VTable creation and abstraction could maybe even be done through a comptime implementation -> another library?
         const VTable = struct {
             handle: *const fn (this: *ViewType, event: Event) anyerror!*Events,
             render: *const fn (this: *ViewType, renderer: *Renderer) anyerror!void,
+            enable: *const fn (this: *ViewType) void,
+            disable: *const fn (this: *ViewType) void,
             deinit: *const fn (this: *ViewType) void,
         };
 
@@ -36,7 +41,7 @@ pub fn View(comptime Event: type, comptime Renderer: type) type {
         vtable: *const VTable = undefined,
 
         /// Handle the provided `Event` for this `View`.
-        pub fn handle(this: *ViewType, event: Event) anyerror!*Events {
+        pub fn handle(this: *ViewType, event: Event) !*Events {
             switch (event) {
                 .resize => |size| {
                     log.debug("Event .resize: {{ .anchor = {{ .col = {d}, .row = {d} }}, .cols = {d}, .rows = {d} }}", .{
@@ -56,6 +61,16 @@ pub fn View(comptime Event: type, comptime Renderer: type) type {
             try this.vtable.render(this, renderer);
         }
 
+        /// Function to call when this `View` will be handled and rendered as the 'active' `View`.
+        pub fn enable(this: *ViewType) void {
+            this.vtable.enable(this);
+        }
+
+        /// Function to call when this `View` will no longer be 'active'.
+        pub fn disable(this: *ViewType) void {
+            this.vtable.disable(this);
+        }
+
         pub fn deinit(this: *ViewType) void {
             this.vtable.deinit(this);
         }
@@ -76,6 +91,18 @@ pub fn View(comptime Event: type, comptime Renderer: type) type {
                             try view.render(renderer);
                         }
                     }.render,
+                    .enable = struct {
+                        fn enable(this: *ViewType) void {
+                            const view: @TypeOf(object) = @ptrCast(@alignCast(this.object));
+                            view.enable();
+                        }
+                    }.enable,
+                    .disable = struct {
+                        fn disable(this: *ViewType) void {
+                            const view: @TypeOf(object) = @ptrCast(@alignCast(this.object));
+                            view.disable();
+                        }
+                    }.diable,
                     .deinit = struct {
                         fn deinit(this: *ViewType) void {
                             const view: @TypeOf(object) = @ptrCast(@alignCast(this.object));