Switch to single-instance Widget model

And make widget() functions return pointers to widgets instead of just
widgets

Signed-off-by: AnErrupTion <anerruption@disroot.org>

ly-ui/src/TerminalBuffer.zig

@@ -169,8 +169,8 @@ pub fn runEventLoop(
     self: *TerminalBuffer,
     allocator: Allocator,
     shared_error: SharedError,
-    layers: [][]Widget,
-    active_widget: Widget,
+    layers: [][]*Widget,
+    active_widget: *Widget,
     inactivity_delay: u16,
     position_widgets_fn: *const fn (*anyopaque) anyerror!void,
     inactivity_event_fn: ?*const fn (*anyopaque) anyerror!void,
@@ -189,7 +189,7 @@ pub fn runEventLoop(
 
     var i: usize = 0;
     for (layers) |layer| {
-        for (layer) |*widget| {
+        for (layer) |widget| {
             try widget.update(context);
 
             if (widget.vtable.handle_fn != null) {
@@ -210,7 +210,7 @@ pub fn runEventLoop(
     while (self.run) {
         if (self.update) {
             for (layers) |layer| {
-                for (layer) |*widget| {
+                for (layer) |widget| {
                     try widget.update(context);
                 }
             }
@@ -229,7 +229,7 @@ pub fn runEventLoop(
             try TerminalBuffer.clearScreen(false);
 
             for (layers) |layer| {
-                for (layer) |*widget| {
+                for (layer) |widget| {
                     widget.draw();
                 }
             }
@@ -239,7 +239,7 @@ pub fn runEventLoop(
 
         var maybe_timeout: ?usize = null;
         for (layers) |layer| {
-            for (layer) |*widget| {
+            for (layer) |widget| {
                 if (try widget.calculateTimeout(context)) |widget_timeout| {
                     if (maybe_timeout == null or widget_timeout < maybe_timeout.?) maybe_timeout = widget_timeout;
                 }
@@ -275,7 +275,7 @@ pub fn runEventLoop(
             );
 
             for (layers) |layer| {
-                for (layer) |*widget| {
+                for (layer) |widget| {
                     widget.realloc() catch |err| {
                         shared_error.writeError(error.WidgetReallocationFailed);
                         try self.log_file.err(
@@ -326,7 +326,7 @@ pub fn getActiveWidget(self: *TerminalBuffer) *Widget {
     return self.handlable_widgets.items[self.active_widget_index];
 }
 
-pub fn setActiveWidget(self: *TerminalBuffer, widget: Widget) void {
+pub fn setActiveWidget(self: *TerminalBuffer, widget: *Widget) void {
     for (self.handlable_widgets.items, 0..) |widg, i| {
         if (widg.id == widget.id) self.active_widget_index = i;
     }

ly-ui/src/components/BigLabel.zig

@@ -44,6 +44,7 @@ pub const BigLabelLocale = enum {
     fa,
 };
 
+instance: ?Widget = null,
 allocator: ?Allocator = null,
 buffer: *TerminalBuffer,
 text: []const u8,
@@ -67,6 +68,7 @@ pub fn init(
     calculate_timeout_fn: ?*const fn (*BigLabel, *anyopaque) anyerror!?usize,
 ) BigLabel {
     return .{
+        .instance = null,
         .allocator = null,
         .buffer = buffer,
         .text = text,
@@ -85,8 +87,9 @@ pub fn deinit(self: *BigLabel) void {
     if (self.allocator) |allocator| allocator.free(self.text);
 }
 
-pub fn widget(self: *BigLabel) Widget {
-    return Widget.init(
+pub fn widget(self: *BigLabel) *Widget {
+    if (self.instance) |*instance| return instance;
+    self.instance = Widget.init(
         "BigLabel",
         null,
         self,
@@ -97,6 +100,7 @@ pub fn widget(self: *BigLabel) Widget {
         null,
         calculateTimeout,
     );
+    return &self.instance.?;
 }
 
 pub fn setTextAlloc(

ly-ui/src/components/CenteredBox.zig

@@ -7,6 +7,7 @@ const Widget = @import("../Widget.zig");
 
 const CenteredBox = @This();
 
+instance: ?Widget = null,
 buffer: *TerminalBuffer,
 horizontal_margin: usize,
 vertical_margin: usize,
@@ -40,6 +41,7 @@ pub fn init(
     update_fn: ?*const fn (*CenteredBox, *anyopaque) anyerror!void,
 ) CenteredBox {
     return .{
+        .instance = null,
         .buffer = buffer,
         .horizontal_margin = horizontal_margin,
         .vertical_margin = vertical_margin,
@@ -59,8 +61,9 @@ pub fn init(
     };
 }
 
-pub fn widget(self: *CenteredBox) Widget {
-    return Widget.init(
+pub fn widget(self: *CenteredBox) *Widget {
+    if (self.instance) |*instance| return instance;
+    self.instance = Widget.init(
         "CenteredBox",
         null,
         self,
@@ -71,6 +74,7 @@ pub fn widget(self: *CenteredBox) Widget {
         null,
         null,
     );
+    return &self.instance.?;
 }
 
 pub fn positionXY(self: *CenteredBox, original_pos: Position) void {

ly-ui/src/components/Label.zig

@@ -8,6 +8,7 @@ const Position = @import("../Position.zig");
 const TerminalBuffer = @import("../TerminalBuffer.zig");
 const Widget = @import("../Widget.zig");
 
+instance: ?Widget,
 allocator: ?Allocator,
 text: []const u8,
 max_width: ?usize,
@@ -27,6 +28,7 @@ pub fn init(
     calculate_timeout_fn: ?*const fn (*Label, *anyopaque) anyerror!?usize,
 ) Label {
     return .{
+        .instance = null,
         .allocator = null,
         .text = text,
         .max_width = max_width,
@@ -43,8 +45,9 @@ pub fn deinit(self: *Label) void {
     if (self.allocator) |allocator| allocator.free(self.text);
 }
 
-pub fn widget(self: *Label) Widget {
-    return Widget.init(
+pub fn widget(self: *Label) *Widget {
+    if (self.instance) |*instance| return instance;
+    self.instance = Widget.init(
         "Label",
         null,
         self,
@@ -55,6 +58,7 @@ pub fn widget(self: *Label) Widget {
         null,
         calculateTimeout,
     );
+    return &self.instance.?;
 }
 
 pub fn setTextAlloc(

ly-ui/src/components/Text.zig

@@ -10,6 +10,7 @@ const DynamicString = std.ArrayListUnmanaged(u8);
 
 const Text = @This();
 
+instance: ?Widget,
 allocator: Allocator,
 buffer: *TerminalBuffer,
 text: DynamicString,
@@ -38,6 +39,7 @@ pub fn init(
 ) !*Text {
     var self = try allocator.create(Text);
     self.* = Text{
+        .instance = null,
         .allocator = allocator,
         .buffer = buffer,
         .text = .empty,
@@ -70,8 +72,9 @@ pub fn deinit(self: *Text) void {
     self.allocator.destroy(self);
 }
 
-pub fn widget(self: *Text) Widget {
-    return Widget.init(
+pub fn widget(self: *Text) *Widget {
+    if (self.instance) |*instance| return instance;
+    self.instance = Widget.init(
         "Text",
         self.keybinds,
         self,
@@ -82,6 +85,7 @@ pub fn widget(self: *Text) Widget {
         handle,
         null,
     );
+    return &self.instance.?;
 }
 
 pub fn positionX(self: *Text, original_pos: Position) void {