ash/wm/resize_shadow.h

   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  private:
  51   // Images for the shadow effect.
  52   scoped_ptr<views::corewm::ImageGrid> image_grid_;
  53
  54   // Hit test value from last call to ShowForHitTest().  Used to prevent
  55   // repeatedly triggering the same animations for the same hit.
  56   int last_hit_test_;
  57
  58   DISALLOW_COPY_AND_ASSIGN(ResizeShadow);
  59 };
  60
  61 }  // namespace internal
  62 }  // namespace ash
  63
  64 #endif  // ASH_WM_RESIZE_SHADOW_H_