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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_WM_RESIZE_SHADOW_H_
      6 #define ASH_WM_RESIZE_SHADOW_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/memory/scoped_ptr.h"
     10 
     11 namespace aura {
     12 class Window;
     13 }
     14 namespace gfx {
     15 class Rect;
     16 }
     17 namespace ui {
     18 class Layer;
     19 }
     20 namespace views {
     21 namespace corewm {
     22 class ImageGrid;
     23 }
     24 }
     25 
     26 namespace ash {
     27 namespace internal {
     28 
     29 // A class to render the resize edge effect when the user moves their mouse
     30 // over a sizing edge.  This is just a visual effect; the actual resize is
     31 // handled by the EventFilter.
     32 class ResizeShadow {
     33  public:
     34   ResizeShadow();
     35   ~ResizeShadow();
     36 
     37   // Initializes the resize effect layers for a given |window|.
     38   void Init(aura::Window* window);
     39 
     40   // Shows resize effects for one or more edges based on a |hit_test| code, such
     41   // as HTRIGHT or HTBOTTOMRIGHT.
     42   void ShowForHitTest(int hit_test);
     43 
     44   // Hides all resize effects.
     45   void Hide();
     46 
     47   // Updates the effect positions based on the |bounds| of the window.
     48   void Layout(const gfx::Rect& bounds);
     49 
     50   int GetLastHitTestForTest() const {
     51     return last_hit_test_;
     52   }
     53 
     54  private:
     55   // Images for the shadow effect.
     56   scoped_ptr<views::corewm::ImageGrid> image_grid_;
     57 
     58   // Hit test value from last call to ShowForHitTest().  Used to prevent
     59   // repeatedly triggering the same animations for the same hit.
     60   int last_hit_test_;
     61 
     62   DISALLOW_COPY_AND_ASSIGN(ResizeShadow);
     63 };
     64 
     65 }  // namespace internal
     66 }  // namespace ash
     67 
     68 #endif  // ASH_WM_RESIZE_SHADOW_H_
     69