ash/wm/resize_shadow_controller.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_CONTROLLER_H_
   6 #define ASH_WM_RESIZE_SHADOW_CONTROLLER_H_
   7
   8 #include <map>
   9
  10 #include "ash/ash_export.h"
  11 #include "base/basictypes.h"
  12 #include "base/compiler_specific.h"
  13 #include "base/memory/linked_ptr.h"
  14 #include "ui/aura/window_observer.h"
  15
  16 namespace aura {
  17 class Window;
  18 }
  19
  20 namespace ash {
  21 namespace internal {
  22
  23 class ResizeShadow;
  24
  25 // ResizeShadowController observes changes to resizable windows and shows
  26 // a resize handle visual effect when the cursor is near the edges.
  27 class ASH_EXPORT ResizeShadowController : public aura::WindowObserver {
  28  public:
  29   ResizeShadowController();
  30   virtual ~ResizeShadowController();
  31
  32   // Shows the appropriate shadow for a given |window| and |hit_test| location.
  33   void ShowShadow(aura::Window* window, int hit_test);
  34
  35   // Hides the shadow for a |window|, if it has one.
  36   void HideShadow(aura::Window* window);
  37
  38   ResizeShadow* GetShadowForWindowForTest(aura::Window* window);
  39
  40   // aura::WindowObserver overrides:
  41   virtual void OnWindowBoundsChanged(
  42       aura::Window* window,
  43       const gfx::Rect& old_bounds,
  44       const gfx::Rect& new_bounds) OVERRIDE;
  45   virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE;
  46
  47  private:
  48   typedef std::map<aura::Window*, linked_ptr<ResizeShadow> > WindowShadowMap;
  49
  50   // Creates a shadow for a given window and returns it.  |window_shadows_|
  51   // owns the memory.
  52   ResizeShadow* CreateShadow(aura::Window* window);
  53
  54   // Returns the resize shadow for |window| or NULL if no shadow exists.
  55   ResizeShadow* GetShadowForWindow(aura::Window* window);
  56
  57   WindowShadowMap window_shadows_;
  58
  59   DISALLOW_COPY_AND_ASSIGN(ResizeShadowController);
  60 };
  61
  62 }  // namespace internal
  63 }  // namespace ash
  64
  65 #endif  // ASH_WM_RESIZE_SHADOW_CONTROLLER_H_