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/*
* Copyright (C) 2011 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "platform/scroll/ScrollbarThemeOverlay.h"
#include "platform/PlatformMouseEvent.h"
#include "platform/graphics/GraphicsContext.h"
#include "platform/scroll/ScrollbarThemeClient.h"
#include "platform/transforms/TransformationMatrix.h"
#include "public/platform/Platform.h"
#include "public/platform/WebRect.h"
#include "public/platform/WebThemeEngine.h"
#include <algorithm>
namespace blink {
ScrollbarThemeOverlay::ScrollbarThemeOverlay(int thumbThickness, int scrollbarMargin, HitTestBehavior allowHitTest, Color color)
: ScrollbarTheme()
, m_thumbThickness(thumbThickness)
, m_scrollbarMargin(scrollbarMargin)
, m_allowHitTest(allowHitTest)
, m_color(color)
, m_useSolidColor(true)
{
}
ScrollbarThemeOverlay::ScrollbarThemeOverlay(int thumbThickness, int scrollbarMargin, HitTestBehavior allowHitTest)
: ScrollbarTheme()
, m_thumbThickness(thumbThickness)
, m_scrollbarMargin(scrollbarMargin)
, m_allowHitTest(allowHitTest)
, m_useSolidColor(false)
{
}
int ScrollbarThemeOverlay::scrollbarThickness(ScrollbarControlSize controlSize)
{
return m_thumbThickness + m_scrollbarMargin;
}
int ScrollbarThemeOverlay::scrollbarMargin() const
{
return m_scrollbarMargin;
}
bool ScrollbarThemeOverlay::usesOverlayScrollbars() const
{
return true;
}
int ScrollbarThemeOverlay::thumbPosition(ScrollbarThemeClient* scrollbar)
{
if (!scrollbar->totalSize())
return 0;
int trackLen = trackLength(scrollbar);
float proportion = static_cast<float>(scrollbar->currentPos()) / scrollbar->totalSize();
return round(proportion * trackLen);
}
int ScrollbarThemeOverlay::thumbLength(ScrollbarThemeClient* scrollbar)
{
int trackLen = trackLength(scrollbar);
if (!scrollbar->totalSize())
return trackLen;
float proportion = static_cast<float>(scrollbar->visibleSize()) / scrollbar->totalSize();
int length = round(proportion * trackLen);
length = std::min(std::max(length, minimumThumbLength(scrollbar)), trackLen);
return length;
}
bool ScrollbarThemeOverlay::hasThumb(ScrollbarThemeClient* scrollbar)
{
return true;
}
IntRect ScrollbarThemeOverlay::backButtonRect(ScrollbarThemeClient*, ScrollbarPart, bool)
{
return IntRect();
}
IntRect ScrollbarThemeOverlay::forwardButtonRect(ScrollbarThemeClient*, ScrollbarPart, bool)
{
return IntRect();
}
IntRect ScrollbarThemeOverlay::trackRect(ScrollbarThemeClient* scrollbar, bool)
{
IntRect rect = scrollbar->frameRect();
if (scrollbar->orientation() == HorizontalScrollbar)
rect.inflateX(-m_scrollbarMargin);
else
rect.inflateY(-m_scrollbarMargin);
return rect;
}
int ScrollbarThemeOverlay::thumbThickness(ScrollbarThemeClient*)
{
return m_thumbThickness;
}
void ScrollbarThemeOverlay::paintThumb(GraphicsContext* context, ScrollbarThemeClient* scrollbar, const IntRect& rect)
{
IntRect thumbRect = rect;
if (scrollbar->orientation() == HorizontalScrollbar) {
thumbRect.setHeight(thumbRect.height() - m_scrollbarMargin);
} else {
thumbRect.setWidth(thumbRect.width() - m_scrollbarMargin);
if (scrollbar->isLeftSideVerticalScrollbar())
thumbRect.setX(thumbRect.x() + m_scrollbarMargin);
}
if (m_useSolidColor) {
context->fillRect(thumbRect, m_color);
return;
}
WebThemeEngine::State state = WebThemeEngine::StateNormal;
if (scrollbar->pressedPart() == ThumbPart)
state = WebThemeEngine::StatePressed;
else if (scrollbar->hoveredPart() == ThumbPart)
state = WebThemeEngine::StateHover;
WebCanvas* canvas = context->canvas();
WebThemeEngine::Part part = WebThemeEngine::PartScrollbarHorizontalThumb;
if (scrollbar->orientation() == VerticalScrollbar)
part = WebThemeEngine::PartScrollbarVerticalThumb;
Platform::current()->themeEngine()->paint(canvas, part, state, WebRect(rect), 0);
}
ScrollbarPart ScrollbarThemeOverlay::hitTest(ScrollbarThemeClient* scrollbar, const IntPoint& position)
{
if (m_allowHitTest == DisallowHitTest)
return NoPart;
return ScrollbarTheme::hitTest(scrollbar, position);
}
} // namespace blink
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