Super slow MicroProfile GL UI.

src/poly/ui/ui_event.h

@@ -29,12 +29,16 @@ class UIEvent {
 class KeyEvent : public UIEvent {
  public:
   KeyEvent(Control* control, int key_code)
-      : UIEvent(control), key_code_(key_code) {}
+      : UIEvent(control), handled_(false), key_code_(key_code) {}
   ~KeyEvent() override = default;
 
+  bool is_handled() const { return handled_; }
+  void set_handled(bool value) { handled_ = value; }
+
   int key_code() const { return key_code_; }
 
  private:
+  bool handled_;
   int key_code_;
 };
 
@@ -52,9 +56,18 @@ class MouseEvent : public UIEvent {
  public:
   MouseEvent(Control* control, Button button, int32_t x, int32_t y,
              int32_t dx = 0, int32_t dy = 0)
-      : UIEvent(control), button_(button), x_(x), y_(y), dx_(dx), dy_(dy) {}
+      : UIEvent(control),
+        handled_(false),
+        button_(button),
+        x_(x),
+        y_(y),
+        dx_(dx),
+        dy_(dy) {}
   ~MouseEvent() override = default;
 
+  bool is_handled() const { return handled_; }
+  void set_handled(bool value) { handled_ = value; }
+
   Button button() const { return button_; }
   int32_t x() const { return x_; }
   int32_t y() const { return y_; }
@@ -62,6 +75,7 @@ class MouseEvent : public UIEvent {
   int32_t dy() const { return dy_; }
 
  private:
+  bool handled_;
   Button button_;
   int32_t x_;
   int32_t y_;

src/poly/ui/win32/win32_control.cc

@@ -342,7 +342,7 @@ bool Win32Control::HandleMouse(UINT message, WPARAM wParam, LPARAM lParam) {
       OnMouseWheel(e);
       break;
   }
-  return true;
+  return e.is_handled();
 }
 
 bool Win32Control::HandleKeyboard(UINT message, WPARAM wParam, LPARAM lParam) {
@@ -350,13 +350,12 @@ bool Win32Control::HandleKeyboard(UINT message, WPARAM wParam, LPARAM lParam) {
   switch (message) {
     case WM_KEYDOWN:
       OnKeyDown(e);
-      return true;
+      break;
     case WM_KEYUP:
       OnKeyUp(e);
-      return true;
-    default:
-      return false;
+      break;
   }
+  return e.is_handled();
 }
 
 }  // namespace win32