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 class ResizeShadow;
  22
  23 // ResizeShadowController observes changes to resizable windows and shows
  24 // a resize handle visual effect when the cursor is near the edges.
  25 class ASH_EXPORT ResizeShadowController : public aura::WindowObserver {
  26  public:
  27   ResizeShadowController();
  28   ~ResizeShadowController() override;
  29
  30   // Shows the appropriate shadow for a given |window| and |hit_test| location.
  31   void ShowShadow(aura::Window* window, int hit_test);
  32
  33   // Hides the shadow for a |window|, if it has one.
  34   void HideShadow(aura::Window* window);
  35
  36   ResizeShadow* GetShadowForWindowForTest(aura::Window* window);
  37
  38   // aura::WindowObserver overrides:
  39   void OnWindowBoundsChanged(aura::Window* window,
  40                              const gfx::Rect& old_bounds,
  41                              const gfx::Rect& new_bounds) override;
  42   void OnWindowDestroyed(aura::Window* window) override;
  43
  44  private:
  45   typedef std::map<aura::Window*, linked_ptr<ResizeShadow> > WindowShadowMap;
  46
  47   // Creates a shadow for a given window and returns it.  |window_shadows_|
  48   // owns the memory.
  49   ResizeShadow* CreateShadow(aura::Window* window);
  50
  51   // Returns the resize shadow for |window| or NULL if no shadow exists.
  52   ResizeShadow* GetShadowForWindow(aura::Window* window);
  53
  54   WindowShadowMap window_shadows_;
  55
  56   DISALLOW_COPY_AND_ASSIGN(ResizeShadowController);
  57 };
  58
  59 }  // namespace ash
  60
  61 #endif  // ASH_WM_RESIZE_SHADOW_CONTROLLER_H_