ui/views/native_theme_delegate.h

   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_