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| 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 // Simple class that draws a drop shadow around content at given bounds. | |
| 21 class WM_EXPORT Shadow : public ui::ImplicitAnimationObserver { | |
| 22 public: | |
| 23 enum Style { | |
| 24 // Active windows have more opaque shadows, shifted down to make the window | |
| 25 // appear "higher". | |
| 26 STYLE_ACTIVE, | |
| 27 | |
| 28 // Inactive windows have less opaque shadows. | |
| 29 STYLE_INACTIVE, | |
| 30 | |
| 31 // Small windows like tooltips and context menus have lighter, smaller | |
| 32 // shadows. | |
| 33 STYLE_SMALL, | |
| 34 }; | |
| 35 | |
| 36 Shadow(); | |
| 37 virtual ~Shadow(); | |
| 38 | |
| 39 void Init(Style style); | |
| 40 | |
| 41 // Returns |layer_.get()|. This is exposed so it can be added to the same | |
| 42 // layer as the content and stacked below it. SetContentBounds() should be | |
| 43 // used to adjust the shadow's size and position (rather than applying | |
| 44 // transformations to this layer). | |
| 45 ui::Layer* layer() const { return layer_.get(); } | |
| 46 | |
| 47 const gfx::Rect& content_bounds() const { return content_bounds_; } | |
| 48 Style style() const { return style_; } | |
| 49 | |
| 50 // Moves and resizes the shadow layer to frame |content_bounds|. | |
| 51 void SetContentBounds(const gfx::Rect& content_bounds); | |
| 52 | |
| 53 // Sets the shadow's style, animating opacity as necessary. | |
| 54 void SetStyle(Style style); | |
| 55 | |
| 56 // ui::ImplicitAnimationObserver overrides: | |
| 57 virtual void OnImplicitAnimationsCompleted() override; | |
| 58 | |
| 59 private: | |
| 60 // Updates the shadow images to the current |style_|. | |
| 61 void UpdateImagesForStyle(); | |
| 62 | |
| 63 // Updates the shadow layer bounds based on the inteior inset and the current | |
| 64 // |content_bounds_|. | |
| 65 void UpdateLayerBounds(); | |
| 66 | |
| 67 // The current style, set when the transition animation starts. | |
| 68 Style style_; | |
| 69 | |
| 70 // The parent layer of the shadow layer. It serves as a container accessible | |
| 71 // from the outside to control the visibility of the shadow. | |
| 72 scoped_ptr<ui::Layer> layer_; | |
| 73 | |
| 74 // The actual shadow layer corresponding to a cc::NinePatchLayer. | |
| 75 scoped_ptr<ui::Layer> shadow_layer_; | |
| 76 | |
| 77 // Size of the current shadow image. | |
| 78 gfx::Size image_size_; | |
| 79 | |
| 80 // Bounds of the content that the shadow encloses. | |
| 81 gfx::Rect content_bounds_; | |
| 82 | |
| 83 // The interior inset of the shadow images. The content bounds of the image | |
| 84 // grid should be set to |content_bounds_| inset by this amount. | |
| 85 int interior_inset_; | |
| 86 | |
| 87 DISALLOW_COPY_AND_ASSIGN(Shadow); | |
| 88 }; | |
| 89 | |
| 90 } // namespace wm | |
| 91 | |
| 92 #endif // UI_WM_CORE_SHADOW_H_ | |
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