| // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef VIEWS_NATIVE_THEME_PAINTER_H_ |
| #define VIEWS_NATIVE_THEME_PAINTER_H_ |
| #pragma once |
| |
| #include "base/compiler_specific.h" |
| #include "ui/gfx/native_theme.h" |
| #include "views/painter.h" |
| |
| namespace gfx { |
| class Canvas; |
| class Size; |
| } |
| |
| namespace ui { |
| class Animation; |
| } |
| |
| namespace views { |
| |
| // A Painter that uses NativeTheme to implement painting and sizing. A |
| // theme delegate must be given at construction time so that the appropriate |
| // painting and sizing can be done. |
| class NativeThemePainter : public Painter { |
| public: |
| // A delagate that supports animating transtions between different native |
| // theme states. If animation is onging, the native theme painter will |
| // composite the foreground state over the backgroud state using an alpha |
| // between 0 and 255 based on the current value of the animation. |
| class Delegate { |
| public: |
| virtual ~Delegate() {} |
| |
| // Get the part that this native theme painter should draw. |
| virtual gfx::NativeTheme::Part GetThemePart() const = 0; |
| |
| // Get the state of the part, along with any extra data needed for painting. |
| virtual gfx::NativeTheme::State GetThemeState( |
| gfx::NativeTheme::ExtraParams* params) const = 0; |
| |
| // If the native theme painter is animated, return the Animation object |
| // that is controlling it. If no animation is ongoing, NULL may be |
| // returned. |
| virtual ui::Animation* GetThemeAnimation() const = 0; |
| |
| // If animation is onging, this returns the background native theme state. |
| virtual gfx::NativeTheme::State GetBackgroundThemeState( |
| gfx::NativeTheme::ExtraParams* params) const = 0; |
| |
| // If animation is onging, this returns the foreground native theme state. |
| // This state will be composited over the background using an alpha value |
| // based on the current value of the animation. |
| virtual gfx::NativeTheme::State GetForegroundThemeState( |
| gfx::NativeTheme::ExtraParams* params) const = 0; |
| }; |
| |
| explicit NativeThemePainter(Delegate* delegate); |
| |
| virtual ~NativeThemePainter() {} |
| |
| // Returns the preferred size of the native part being painted. |
| gfx::Size GetPreferredSize(); |
| |
| private: |
| // The delegate the controls the appearance of this painter. |
| Delegate* delegate_; |
| |
| // Overridden from Painter: |
| virtual void Paint(int w, int h, gfx::Canvas* canvas) OVERRIDE; |
| |
| DISALLOW_COPY_AND_ASSIGN(NativeThemePainter); |
| }; |
| |
| } // namespace views |
| |
| #endif // VIEWS_NATIVE_THEME_PAINTER_H_ |