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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef ASH_DISPLAY_SHARED_DISPLAY_EDGE_INDICATOR_H_
      6 #define ASH_DISPLAY_SHARED_DISPLAY_EDGE_INDICATOR_H_
      7 
      8 #include "ash/ash_export.h"
      9 #include "base/basictypes.h"
     10 #include "base/memory/scoped_ptr.h"
     11 #include "ui/gfx/animation/animation_delegate.h"
     12 #include "ui/gfx/display.h"
     13 
     14 namespace gfx {
     15 class Rect;
     16 class ThrobAnimation;
     17 }
     18 
     19 namespace views {
     20 class View;
     21 class Widget;
     22 }
     23 
     24 namespace ash {
     25 
     26 // SharedDisplayEdgeIndicator is responsible for showing a window that indicates
     27 // the edge that a window can be dragged into another display.
     28 class ASH_EXPORT SharedDisplayEdgeIndicator : public gfx::AnimationDelegate {
     29  public:
     30   SharedDisplayEdgeIndicator();
     31   virtual ~SharedDisplayEdgeIndicator();
     32 
     33   // Shows/Hides the indicator window. The |src_bounds| is for the window on
     34   // the source display, and the |dst_bounds| is for the window on the other
     35   // display.
     36   void Show(const gfx::Rect& src_bounds, const gfx::Rect& dst_bounds);
     37   void Hide();
     38 
     39   // gfx::AnimationDelegate overrides:
     40   virtual void AnimationProgressed(const gfx::Animation* animation) OVERRIDE;
     41 
     42  private:
     43   // Used to show the displays' shared edge where a window can be moved across.
     44   // |src_widget_| is for the display where drag starts and |dst_widget_| is
     45   // for the other display.
     46   views::View* src_indicator_;
     47   views::View* dst_indicator_;
     48 
     49   // Used to transition the opacity.
     50   scoped_ptr<gfx::ThrobAnimation> animation_;
     51 
     52   DISALLOW_COPY_AND_ASSIGN(SharedDisplayEdgeIndicator);
     53 };
     54 
     55 }  // namespace ash
     56 
     57 #endif  // ASH_DISPLAY_SHARED_DISPLAY_EDGE_INDICATOR_H_
     58