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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_VIEWS_COREWM_SHADOW_H_
      6 #define UI_VIEWS_COREWM_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/views/views_export.h"
     13 
     14 namespace ui {
     15 class Layer;
     16 }  // namespace ui
     17 
     18 namespace views {
     19 namespace corewm {
     20 
     21 class ImageGrid;
     22 
     23 // Simple class that draws a drop shadow around content at given bounds.
     24 class VIEWS_EXPORT Shadow : public ui::ImplicitAnimationObserver {
     25  public:
     26   enum Style {
     27     // Active windows have more opaque shadows, shifted down to make the window
     28     // appear "higher".
     29     STYLE_ACTIVE,
     30 
     31     // Inactive windows have less opaque shadows.
     32     STYLE_INACTIVE,
     33 
     34     // Small windows like tooltips and context menus have lighter, smaller
     35     // shadows.
     36     STYLE_SMALL,
     37   };
     38 
     39   Shadow();
     40   virtual ~Shadow();
     41 
     42   void Init(Style style);
     43 
     44   // Returns |image_grid_|'s ui::Layer.  This is exposed so it can be added to
     45   // the same layer as the content and stacked below it.  SetContentBounds()
     46   // should be used to adjust the shadow's size and position (rather than
     47   // applying transformations to this layer).
     48   ui::Layer* layer() const;
     49 
     50   const gfx::Rect& content_bounds() const { return content_bounds_; }
     51   Style style() const { return style_; }
     52 
     53   // Moves and resizes |image_grid_| to frame |content_bounds|.
     54   void SetContentBounds(const gfx::Rect& content_bounds);
     55 
     56   // Sets the shadow's style, animating opacity as necessary.
     57   void SetStyle(Style style);
     58 
     59   // ui::ImplicitAnimationObserver overrides:
     60   virtual void OnImplicitAnimationsCompleted() OVERRIDE;
     61 
     62  private:
     63   // Updates the |image_grid_| images to the current |style_|.
     64   void UpdateImagesForStyle();
     65 
     66   // Updates the |image_grid_| bounds based on its image sizes and the
     67   // current |content_bounds_|.
     68   void UpdateImageGridBounds();
     69 
     70   // The current style, set when the transition animation starts.
     71   Style style_;
     72 
     73   scoped_ptr<ImageGrid> image_grid_;
     74 
     75   // Bounds of the content that the shadow encloses.
     76   gfx::Rect content_bounds_;
     77 
     78   // The interior inset of the shadow images. The content bounds of the image
     79   // grid should be set to |content_bounds_| inset by this amount.
     80   int interior_inset_;
     81 
     82   DISALLOW_COPY_AND_ASSIGN(Shadow);
     83 };
     84 
     85 }  // namespace corewm
     86 }  // namespace views
     87 
     88 #endif  // UI_VIEWS_COREWM_SHADOW_H_
     89