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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_DELEGATE_H_
#define VIEWS_NATIVE_THEME_DELEGATE_H_
#pragma once
#include "ui/gfx/native_theme.h"
#include "ui/gfx/rect.h"
namespace views {
// A delagate that supports animating transtions between different native
// theme states. This delegate can be used to control a native theme Border
// or Painter object.
//
// If animation is onging, the native theme border or 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 NativeThemeDelegate {
public:
virtual ~NativeThemeDelegate() {}
// Get the native theme part that should be drawn.
virtual gfx::NativeTheme::Part GetThemePart() const = 0;
// Get the rectangle that should be painted.
virtual gfx::Rect GetThemePaintRect() const = 0;
// Get the state of the part, along with any extra data needed for drawing.
virtual gfx::NativeTheme::State GetThemeState(
gfx::NativeTheme::ExtraParams* params) const = 0;
// If the native theme drawign should be animated, return the Animation object
// that controlls it. If no animation is ongoing, NULL may be returned.
virtual const 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;
};
} // namespace views
#endif // VIEWS_NATIVE_THEME_DELEGATE_H_