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// 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_
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