Refactored MouseWatcher to allow regions other than Views to

ui/views/mouse_watcher_view_host.h

+// Copyright (c) 2011 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 UI_VIEWS_MOUSE_WATCHER_VIEW_HOST_H_
+#define UI_VIEWS_MOUSE_WATCHER_VIEW_HOST_H_
+#pragma once
+
+#include "ui/views/mouse_watcher.h"
+
+namespace views {
+
+class View;
+
+class VIEWS_EXPORT MouseWatcherViewHost : public MouseWatcherHost {
+ public:
+  // Creates a new MouseWatcherViewHost. |hot_zone_insets| is added to the
+  // bounds of the view to determine the active zone. For example, if
+  // |hot_zone_insets.bottom()| is 10, then the listener is not notified if
+  // the y coordinate is between the origin of the view and height of the view
+  // plus 10.
+  MouseWatcherViewHost(View* view, const gfx::Insets& hot_zone_insets);
+  virtual ~MouseWatcherViewHost();
+
+  // MouseWatcherHost.
+  virtual bool Contains(
+      const gfx::Point& screen_point,
+      MouseEventType type) OVERRIDE;
+
+ private:
+  bool IsCursorInViewZone(const gfx::Point& screen_point);
+  bool IsMouseOverWindow();
+
+  // View we're listening for events over.
+  View* view_;
+  // Insets added to the bounds of the view.
+  const gfx::Insets hot_zone_insets_;
+
+  DISALLOW_COPY_AND_ASSIGN(MouseWatcherViewHost);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_MOUSE_WATCHER_VIEW_HOST_H_