refactor canvas

applications/gui/widget.h

@@ -1,20 +1,11 @@
 #pragma once
 
 #include <input/input.h>
+#include "canvas.h"
 
-typedef struct GUI GUI;
-typedef struct Canvas Canvas;
+typedef struct Widget Widget;
 
-typedef struct {
-    void* gui;
-    bool is_enabled;
-    WidgetDrawCallback draw_callback;
-    void* draw_callback_context;
-    WidgetInputCallback input_callback;
-    void* input_callback_context;
-} Widget;
-
-typedef void (*WidgetDrawCallback)(Canvas* canvas, void* context);
+typedef void (*WidgetDrawCallback)(CanvasApi* api, void* context);
 typedef void (*WidgetInputCallback)(InputEvent* event, void* context);
 
 Widget* widget_alloc();