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// Copyright (c) 2012 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.
#include "ui/views/native_theme_painter.h"
#include "base/logging.h"
#include "ui/base/animation/animation.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/rect.h"
#include "ui/views/native_theme_delegate.h"
#include "ui/views/view.h"
namespace views {
NativeThemePainter::NativeThemePainter(NativeThemeDelegate* delegate,
views::View* view)
: delegate_(delegate),
view_(view) {
DCHECK(delegate_);
}
gfx::Size NativeThemePainter::GetPreferredSize() {
const ui::NativeTheme* theme = view_->GetNativeTheme();
ui::NativeTheme::ExtraParams extra;
ui::NativeTheme::State state = delegate_->GetThemeState(&extra);
return theme->GetPartSize(delegate_->GetThemePart(), state, extra);
}
void NativeThemePainter::Paint(gfx::Canvas* canvas, const gfx::Size& size) {
const ui::NativeTheme* native_theme = view_->GetNativeTheme();
ui::NativeTheme::Part part = delegate_->GetThemePart();
gfx::Rect rect(size);
if (delegate_->GetThemeAnimation() != NULL &&
delegate_->GetThemeAnimation()->is_animating()) {
// Paint background state.
ui::NativeTheme::ExtraParams prev_extra;
ui::NativeTheme::State prev_state =
delegate_->GetBackgroundThemeState(&prev_extra);
native_theme->Paint(canvas->sk_canvas(), part, prev_state, rect,
prev_extra);
// Composite foreground state above it.
ui::NativeTheme::ExtraParams extra;
ui::NativeTheme::State state = delegate_->GetForegroundThemeState(&extra);
int alpha = delegate_->GetThemeAnimation()->CurrentValueBetween(0, 255);
canvas->SaveLayerAlpha(static_cast<uint8>(alpha));
native_theme->Paint(canvas->sk_canvas(), part, state, rect, extra);
canvas->Restore();
} else {
ui::NativeTheme::ExtraParams extra;
ui::NativeTheme::State state = delegate_->GetThemeState(&extra);
native_theme->Paint(canvas->sk_canvas(), part, state, rect, extra);
}
}
} // namespace views
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