Integrate ContextMenu with Pinnable logic.

include/JUI/Widgets/ContextMenu.hpp

@@ -14,6 +14,7 @@
 #include <JUI/Widgets/TextButton.hpp>
 
 #include "ListLayout.hpp"
+#include "JUI/Mixins/Pinnable.hpp"
 
 namespace JUI {
 
@@ -55,13 +56,13 @@ namespace JUI {
 
     };
 
-
-
     /// A vertically-descending list menu of button objects, which supports sub-menus much like class UtilityBar.
     /// @see UtilityBar
-    class ContextMenu  : public Rect {
+    class ContextMenu  : public Rect, public Pinnable {
     public:
 
+        Event<> PresumeMouseFocusLost;
+
         void PropogateTextSize(int value) {
             for (auto* child : children) {
                 TextStyleInterface* textual = dynamic_cast<TextStyleInterface *>(child);
@@ -107,12 +108,26 @@ namespace JUI {
         /// @return Whether the widget will automatically hide itself when the mouse leaves its bounding box.
         [[nodiscard]] bool CloseOnHoverLoss() const;
 
+
+        void Update(float delta) override {
+            Rect::Update(delta);
+
+            if (parent->IsMouseInside() || IsMouseInside() || IsMouseInsideDescendants())
+                mouse_outside_tests = 0;
+            else
+                mouse_outside_tests++;
+
+            if (mouse_outside_tests >= 3)
+                PresumeMouseFocusLost();
+        }
+
     protected:
         VerticalListLayout* layout;
         JGL::Font font;
         bool close_on_hover_loss = true;
         float aggregate_height = 0;
         float estimated_width = 0;
+        float mouse_outside_tests = 0;
 
     private: