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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 "ScrollbarThemeChromiumAndroid.h"
#include "PlatformContextSkia.h"
#include "PlatformMouseEvent.h"
#include "Scrollbar.h"
#include "TransformationMatrix.h"
#include <algorithm>
using namespace std;
namespace WebCore {
static const int scrollbarWidth = 8;
static const int scrollbarMargin = 5;
ScrollbarTheme* ScrollbarTheme::nativeTheme()
{
DEFINE_STATIC_LOCAL(ScrollbarThemeChromiumAndroid, theme, ());
return &theme;
}
int ScrollbarThemeChromiumAndroid::scrollbarThickness(ScrollbarControlSize controlSize)
{
return scrollbarWidth + scrollbarMargin;
}
bool ScrollbarThemeChromiumAndroid::usesOverlayScrollbars() const
{
return true;
}
int ScrollbarThemeChromiumAndroid::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 ScrollbarThemeChromiumAndroid::thumbLength(ScrollbarThemeClient* scrollbar)
{
int trackLen = trackLength(scrollbar);
if (!scrollbar->totalSize())
return trackLen;
float proportion = (float)scrollbar->visibleSize() / scrollbar->totalSize();
int length = round(proportion * trackLen);
length = min(max(length, minimumThumbLength(scrollbar)), trackLen);
return length;
}
bool ScrollbarThemeChromiumAndroid::hasThumb(ScrollbarThemeClient* scrollbar)
{
return true;
}
IntRect ScrollbarThemeChromiumAndroid::backButtonRect(ScrollbarThemeClient*, ScrollbarPart, bool)
{
return IntRect();
}
IntRect ScrollbarThemeChromiumAndroid::forwardButtonRect(ScrollbarThemeClient*, ScrollbarPart, bool)
{
return IntRect();
}
IntRect ScrollbarThemeChromiumAndroid::trackRect(ScrollbarThemeClient* scrollbar, bool)
{
IntRect rect = scrollbar->frameRect();
if (scrollbar->orientation() == HorizontalScrollbar)
rect.inflateX(-scrollbarMargin);
else
rect.inflateY(-scrollbarMargin);
return rect;
}
static void fillSmoothEdgedRect(GraphicsContext* context, const IntRect& rect, const Color& color)
{
Color halfColor(color.red(), color.green(), color.blue(), color.alpha() / 2);
IntRect topRect = rect;
topRect.inflateX(-1);
topRect.setHeight(1);
context->fillRect(topRect, halfColor, ColorSpaceDeviceRGB);
IntRect leftRect = rect;
leftRect.inflateY(-1);
leftRect.setWidth(1);
context->fillRect(leftRect, halfColor, ColorSpaceDeviceRGB);
IntRect centerRect = rect;
centerRect.inflate(-1);
context->fillRect(centerRect, color, ColorSpaceDeviceRGB);
IntRect rightRect = rect;
rightRect.inflateY(-1);
rightRect.setX(centerRect.maxX());
rightRect.setWidth(1);
context->fillRect(rightRect, halfColor, ColorSpaceDeviceRGB);
IntRect bottomRect = rect;
bottomRect.inflateX(-1);
bottomRect.setY(centerRect.maxY());
bottomRect.setHeight(1);
context->fillRect(bottomRect, halfColor, ColorSpaceDeviceRGB);
}
void ScrollbarThemeChromiumAndroid::paintThumb(GraphicsContext* context, ScrollbarThemeClient* scrollbar, const IntRect& rect)
{
IntRect thumbRect = rect;
if (scrollbar->orientation() == HorizontalScrollbar)
thumbRect.setHeight(thumbRect.height() - scrollbarMargin);
else
thumbRect.setWidth(thumbRect.width() - scrollbarMargin);
fillSmoothEdgedRect(context, thumbRect, Color(128, 128, 128, 128));
}
} // namespace WebCore
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