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