Implement window focusing.

include/JUI/Base/Widget.hpp

@@ -334,7 +334,6 @@ namespace JUI {
         /// See ReWindowIntegrationDemo for an example.
         virtual bool ObserveKeyInput(Key key, bool pressed);
 
-
     protected:
         void DrawChildWidgets();
         void UpdateChildWidgets(float delta);

include/JUI/DefaultStyle.hpp

@@ -56,6 +56,7 @@ namespace JUI {
             const Vector2 DefaultMinimumSize = {200, 200};
             const int TitlebarHeight = 20;
             const Color4 OutlineColor = {92, 92, 192};
+            const Color4 UnfocusedOutlineColor = Colors::Gray;
             const Color4 ViewportBackgroundColor = Colors::DarkGray;
             const int OutlineWidth = 2;
 

include/JUI/Widgets/Window.hpp

@@ -55,6 +55,19 @@ namespace JUI {
         // TODO: Decide if this will auto-scale with the titlebar's text height, or the other way around.
         [[nodiscard]] int TitlebarHeight() const;
 
+
+        /// @return True if this window widget is on-top of all other window-widgets with the same parent.
+        bool OnTop() const;
+
+
+        /// Brings this window widget to the top of the window-widget stack.
+        void BringToTop();
+
+        /// Moves this window up in the window-widget stack.
+        void MoveUp() const;
+        /// Moves this window down in the window-widget stack.
+        void MoveDown() const;
+
         void TitlebarHeight(int height);
 
         /// Returns the text displayed as the Window's title.
@@ -112,6 +125,27 @@ namespace JUI {
         void OnClick(const Vector2& m_pos, const MouseButton& m_btn) override;
         /// @see class Clickable.
         void OnRelease(const Vector2& m_pos, const MouseButton& m_btn, bool still_hovering) override;
+
+
+        /// @see class Hoverable.
+        void OnHover(const J3ML::LinearAlgebra::Vector2 &MousePos) override
+        {
+            Hoverable::OnHover(MousePos);
+            zindex++;
+            focused = true;
+            this->BorderColor(Style::Window::OutlineColor);
+            this->BGColor(Style::Window::OutlineColor);
+        }
+
+        /// @see class Hoverable.
+        void OnExit(const J3ML::LinearAlgebra::Vector2 &MousePos) override
+        {
+            Hoverable::OnExit(MousePos);
+            zindex--;
+            focused = false;
+            this->BorderColor(Style::Window::UnfocusedOutlineColor);
+            this->BGColor(Style::Window::UnfocusedOutlineColor);
+        }
     protected:
         void UpdateInternalWidgetsTitlebarHeight();
     protected:
@@ -123,6 +157,7 @@ namespace JUI {
         JUI::ImageButton* fs_btn;
         std::string title = "JUI Window";
         bool resizable = true;
+        bool focused = false;
         //bool resizing = false;
         bool draggable = true;
         bool dockable = false;