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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef CHROME_VIEWS_NON_CLIENT_VIEW_H_
+#define CHROME_VIEWS_NON_CLIENT_VIEW_H_
+
+#include "chrome/views/view.h"
+
+namespace gfx {
+class Path;
+}
+
+namespace ChromeViews {
+
+class ClientView;
+
+///////////////////////////////////////////////////////////////////////////////
+// NonClientView
+//
+//  An object implementing the NonClientView interface is a View that provides
+//  the "non-client" areas of a window. This is the area that typically
+//  encompasses the window frame - title bar, sizing borders and window
+//  controls. This interface provides methods that allow a specific
+//  presentation to define non-client areas for windows hit testing, the shape
+//  of the window, and other window-related information.
+//
+class NonClientView : public View {
+ public:
+  virtual void Init(ClientView* client_view) = 0;
+
+  // Calculates the bounds of the client area of the window assuming the
+  // window is sized to |width| and |height|.
+  virtual gfx::Rect CalculateClientAreaBounds(int width,
+                                              int height) const = 0;
+
+  // Calculates the size of window required to display a client area of the
+  // specified width and height.
+  virtual gfx::Size CalculateWindowSizeForClientSize(int width,
+                                                     int height) const = 0;
+
+  // Returns the point, in screen coordinates, where the system menu should
+  // be shown so it shows up anchored to the system menu icon.
+  virtual CPoint GetSystemMenuPoint() const = 0;
+
+  // Determines the windows HT* code when the mouse cursor is at the
+  // specified point, in window coordinates.
+  virtual int NonClientHitTest(const gfx::Point& point) = 0;
+
+  // Returns a mask to be used to clip the top level window for the given
+  // size. This is used to create the non-rectangular window shape.
+  virtual void GetWindowMask(const gfx::Size& size,
+                             gfx::Path* window_mask) = 0;
+
+  // Toggles the enable state for the Close button (and the Close menu item in
+  // the system menu).
+  virtual void EnableClose(bool enable) = 0;
+
+ protected:
+  // Helper for non-client view implementations to determine which area of the
+  // window border the specified |point| falls within. The other parameters are
+  // the size of the sizing edges, and whether or not the window can be
+  // resized.
+  int GetHTComponentForFrame(const gfx::Point& point,
+                             int resize_area_size,
+                             int resize_area_corner_size,
+                             int top_resize_area_size,
+                             bool can_resize);
+};
+
+}  // namespace ChromeViews
+
+#endif  // #ifndef CHROME_VIEWS_NON_CLIENT_VIEW_H_