mash: Preliminary support for widget hit test masks

components/mus/public/cpp/lib/window.cc

 // 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.
 
 #include "components/mus/public/cpp/window.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <set>
@@ skipping 199 matching lines @@
     const std::vector<gfx::Rect>& additional_client_areas) {
   if (!OwnsWindowOrIsRoot(this))
     return;
 
   if (connection_)
     tree_client()->SetClientArea(server_id_, client_area,
                                  additional_client_areas);
   LocalSetClientArea(client_area, additional_client_areas);
 }
 
+void Window::SetHitTestMask(const gfx::Rect& mask) {
+  if (!OwnsWindowOrIsRoot(this))
+    return;
+
+  if (hit_test_mask_ && *hit_test_mask_ == mask)
+    return;
+
+  if (connection_)
+    tree_client()->SetHitTestMask(server_id_, mask);
+  hit_test_mask_.reset(new gfx::Rect(mask));
+}
+
+void Window::ClearHitTestMask() {
+  if (!OwnsWindowOrIsRoot(this))
+    return;
+
+  if (!hit_test_mask_)
+    return;
+
+  if (connection_)
+    tree_client()->ClearHitTestMask(server_id_);
+  hit_test_mask_.reset();
+}
+
 void Window::SetVisible(bool value) {
   if (visible_ == value)
     return;
 
   if (connection_)
     tree_client()->SetVisible(this, value);
   LocalSetVisible(value);
 }
 
 void Window::SetOpacity(float opacity) {
@@ skipping 642 matching lines @@
     notifier->NotifyWindowReordered();
 
   return true;
 }
 
 // static
 Window** Window::GetStackingTarget(Window* window) {
   return &window->stacking_target_;
 }
 }  // namespace mus