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 virtual ~ResizeShadowController(); 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 virtual void OnWindowBoundsChanged( 40 aura::Window* window, 41 const gfx::Rect& old_bounds, 42 const gfx::Rect& new_bounds) OVERRIDE; 43 virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE; 44 45 private: 46 typedef std::map<aura::Window*, linked_ptr<ResizeShadow> > WindowShadowMap; 47 48 // Creates a shadow for a given window and returns it. |window_shadows_| 49 // owns the memory. 50 ResizeShadow* CreateShadow(aura::Window* window); 51 52 // Returns the resize shadow for |window| or NULL if no shadow exists. 53 ResizeShadow* GetShadowForWindow(aura::Window* window); 54 55 WindowShadowMap window_shadows_; 56 57 DISALLOW_COPY_AND_ASSIGN(ResizeShadowController); 58 }; 59 60 } // namespace ash 61 62 #endif // ASH_WM_RESIZE_SHADOW_CONTROLLER_H_ 63