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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_NATIVE_THEME_DELEGATE_H_
      6 #define UI_VIEWS_NATIVE_THEME_DELEGATE_H_
      7 
      8 #include "ui/gfx/rect.h"
      9 #include "ui/native_theme/native_theme.h"
     10 #include "ui/views/views_export.h"
     11 
     12 namespace views {
     13 
     14 // A delagate that supports animating transtions between different native
     15 // theme states.  This delegate can be used to control a native theme Border
     16 // or Painter object.
     17 //
     18 // If animation is ongoing, the native theme border or painter will
     19 // composite the foreground state over the backgroud state using an alpha
     20 // between 0 and 255 based on the current value of the animation.
     21 class VIEWS_EXPORT NativeThemeDelegate {
     22  public:
     23   virtual ~NativeThemeDelegate() {}
     24 
     25   // Get the native theme part that should be drawn.
     26   virtual ui::NativeTheme::Part GetThemePart() const = 0;
     27 
     28   // Get the rectangle that should be painted.
     29   virtual gfx::Rect GetThemePaintRect() const = 0;
     30 
     31   // Get the state of the part, along with any extra data needed for drawing.
     32   virtual ui::NativeTheme::State GetThemeState(
     33       ui::NativeTheme::ExtraParams* params) const = 0;
     34 
     35   // If the native theme drawign should be animated, return the Animation object
     36   // that controlls it.  If no animation is ongoing, NULL may be returned.
     37   virtual const ui::Animation* GetThemeAnimation() const = 0;
     38 
     39   // If animation is onging, this returns the background native theme state.
     40   virtual ui::NativeTheme::State GetBackgroundThemeState(
     41       ui::NativeTheme::ExtraParams* params) const = 0;
     42 
     43   // If animation is onging, this returns the foreground native theme state.
     44   // This state will be composited over the background using an alpha value
     45   // based on the current value of the animation.
     46   virtual ui::NativeTheme::State GetForegroundThemeState(
     47       ui::NativeTheme::ExtraParams* params) const = 0;
     48 };
     49 
     50 }  // namespace views
     51 
     52 #endif  // UI_VIEWS_NATIVE_THEME_DELEGATE_H_
     53