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 UI_WM_CORE_SHADOW_H_ 6 #define UI_WM_CORE_SHADOW_H_ 7 8 #include "base/basictypes.h" 9 #include "base/memory/scoped_ptr.h" 10 #include "ui/compositor/layer_animation_observer.h" 11 #include "ui/gfx/rect.h" 12 #include "ui/wm/wm_export.h" 13 14 namespace ui { 15 class Layer; 16 } // namespace ui 17 18 namespace wm { 19 20 class ImageGrid; 21 22 // Simple class that draws a drop shadow around content at given bounds. 23 class WM_EXPORT Shadow : public ui::ImplicitAnimationObserver { 24 public: 25 enum Style { 26 // Active windows have more opaque shadows, shifted down to make the window 27 // appear "higher". 28 STYLE_ACTIVE, 29 30 // Inactive windows have less opaque shadows. 31 STYLE_INACTIVE, 32 33 // Small windows like tooltips and context menus have lighter, smaller 34 // shadows. 35 STYLE_SMALL, 36 }; 37 38 Shadow(); 39 virtual ~Shadow(); 40 41 void Init(Style style); 42 43 // Returns |image_grid_|'s ui::Layer. This is exposed so it can be added to 44 // the same layer as the content and stacked below it. SetContentBounds() 45 // should be used to adjust the shadow's size and position (rather than 46 // applying transformations to this layer). 47 ui::Layer* layer() const; 48 content_bounds()49 const gfx::Rect& content_bounds() const { return content_bounds_; } style()50 Style style() const { return style_; } 51 52 // Moves and resizes |image_grid_| to frame |content_bounds|. 53 void SetContentBounds(const gfx::Rect& content_bounds); 54 55 // Sets the shadow's style, animating opacity as necessary. 56 void SetStyle(Style style); 57 58 // ui::ImplicitAnimationObserver overrides: 59 virtual void OnImplicitAnimationsCompleted() OVERRIDE; 60 61 private: 62 // Updates the |image_grid_| images to the current |style_|. 63 void UpdateImagesForStyle(); 64 65 // Updates the |image_grid_| bounds based on its image sizes and the 66 // current |content_bounds_|. 67 void UpdateImageGridBounds(); 68 69 // The current style, set when the transition animation starts. 70 Style style_; 71 72 scoped_ptr<ImageGrid> image_grid_; 73 74 // Bounds of the content that the shadow encloses. 75 gfx::Rect content_bounds_; 76 77 // The interior inset of the shadow images. The content bounds of the image 78 // grid should be set to |content_bounds_| inset by this amount. 79 int interior_inset_; 80 81 DISALLOW_COPY_AND_ASSIGN(Shadow); 82 }; 83 84 } // namespace wm 85 86 #endif // UI_WM_CORE_SHADOW_H_ 87