make widgets inherit background color, making for a cleaner demo program

src/Widget.cpp

@@ -160,4 +160,10 @@ void Widget::dispatch_event(Event &event) {
     }
 }
 
+void Widget::on_init() {
+    set_background_fill_color(get_styles()->get_background_color());
+    set_do_background_fill(true);
+    set_did_init(true);
+}
+
 }

src/Widget.hpp

@@ -65,7 +65,7 @@ public:
 
     virtual ~Widget() {};
 protected:
-    virtual void on_init() { set_did_init(true); }
+    virtual void on_init();
     virtual void on_mouse_button(MouseButtonEvent &event) {}
     virtual void on_mouse_move(MouseMoveEvent &event) {}
     virtual void on_focus_update(FocusUpdateEvent &event) {}

src/main.cpp

@@ -6,23 +6,20 @@
 #include "Label.hpp"
 
 int main() {
-    int times_clicked = 0;
-
     Raven::Window window {};
     Raven::Widget main_widget {};
     Raven::Button button {"click meeeeeeeeeeee"};
     Raven::Label label {"click it!"};
 
+    int times_clicked = 0;
+
     window.spawn_window();
 
     button.set_current_geometry(Raven::Box(10, 10, 100, 30));
     label.set_current_geometry(Raven::Box(10, 45, 100, 20));
-
-    main_widget.set_background_fill_color(window.get_top_level_styles()->get_background_color());
-    main_widget.set_do_background_fill(true);
     window.set_main_widget(&main_widget);
 
-    button.on_click = [&label, &times_clicked]() {
+    button.on_click = [&]() {
         times_clicked++;
         label.set_text(std::to_string(times_clicked));
     };
@@ -30,6 +27,7 @@ int main() {
     main_widget.add_child(&button);
     main_widget.add_child(&label);
 
+
     window.run(true);
     return 0;
 }