mash: Preliminary support for widget hit test masks

components/mus/public/cpp/window.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_MUS_PUBLIC_CPP_WINDOW_H_
 #define COMPONENTS_MUS_PUBLIC_CPP_WINDOW_H_
 
 #include <stdint.h>
 #include <vector>
 
@@ skipping 68 matching lines @@
   const gfx::Insets& client_area() const { return client_area_; }
   const std::vector<gfx::Rect>& additional_client_areas() {
     return additional_client_areas_;
   }
   void SetClientArea(const gfx::Insets& new_client_area) {
     SetClientArea(new_client_area, std::vector<gfx::Rect>());
   }
   void SetClientArea(const gfx::Insets& new_client_area,
                      const std::vector<gfx::Rect>& additional_client_areas);
 
+  // Mouse events outside the hit test mask do not hit the window. Returns null
+  // if there is no mask.
+  const gfx::Rect* hit_test_mask() const { return hit_test_mask_.get(); }
+  void SetHitTestMask(const gfx::Rect& mask_rect);
+  void ClearHitTestMask();
+
   // Visibility (also see IsDrawn()). When created windows are hidden.
   bool visible() const { return visible_; }
   void SetVisible(bool value);
 
   float opacity() const { return opacity_; }
   void SetOpacity(float opacity);
 
   // Cursors
   mojom::Cursor predefined_cursor() const { return cursor_id_; }
   void SetPredefinedCursor(mus::mojom::Cursor cursor_id);
@@ skipping 215 matching lines @@
   Children transient_children_;
 
   bool is_modal_;
 
   base::ObserverList<WindowObserver> observers_;
   InputEventHandler* input_event_handler_;
 
   gfx::Rect bounds_;
   gfx::Insets client_area_;
   std::vector<gfx::Rect> additional_client_areas_;
+  std::unique_ptr<gfx::Rect> hit_test_mask_;
 
   mojom::ViewportMetricsPtr viewport_metrics_;
 
   bool visible_;
   float opacity_;
 
   mojom::Cursor cursor_id_;
 
   SharedProperties properties_;
 
@@ skipping 11 matching lines @@
   };
 
   std::map<const void*, Value> prop_map_;
 
   DISALLOW_COPY_AND_ASSIGN(Window);
 };
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_PUBLIC_CPP_WINDOW_H_