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/*
* Copyright (C) 2008 Apple Inc. All Rights Reserved.
* Copyright (C) 2008, 2009 Google Inc.
*
* 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 INC. ``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 INC. OR
* 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 "ScrollbarThemeChromium.h"
#include "PlatformBridge.h"
#include "PlatformMouseEvent.h"
#include "ScrollableArea.h"
#include "Scrollbar.h"
#include "ScrollbarThemeComposite.h"
// -----------------------------------------------------------------------------
// This file contains scrollbar theme code that is cross platform. Additional
// members of ScrollbarThemeChromium can be found in the platform specific files
// -----------------------------------------------------------------------------
namespace WebCore {
bool ScrollbarThemeChromium::hasThumb(Scrollbar* scrollbar)
{
// This method is just called as a paint-time optimization to see if
// painting the thumb can be skipped. We don't have to be exact here.
return thumbLength(scrollbar) > 0;
}
IntRect ScrollbarThemeChromium::backButtonRect(Scrollbar* scrollbar, ScrollbarPart part, bool)
{
// Windows and Linux just have single arrows.
if (part == BackButtonEndPart)
return IntRect();
IntSize size = buttonSize(scrollbar);
return IntRect(scrollbar->x(), scrollbar->y(), size.width(), size.height());
}
IntRect ScrollbarThemeChromium::forwardButtonRect(Scrollbar* scrollbar, ScrollbarPart part, bool)
{
// Windows and Linux just have single arrows.
if (part == ForwardButtonStartPart)
return IntRect();
IntSize size = buttonSize(scrollbar);
int x, y;
if (scrollbar->orientation() == HorizontalScrollbar) {
x = scrollbar->x() + scrollbar->width() - size.width();
y = scrollbar->y();
} else {
x = scrollbar->x();
y = scrollbar->y() + scrollbar->height() - size.height();
}
return IntRect(x, y, size.width(), size.height());
}
IntRect ScrollbarThemeChromium::trackRect(Scrollbar* scrollbar, bool)
{
IntSize bs = buttonSize(scrollbar);
// The buttons at the top and bottom of the scrollbar are square, so the
// thickness of the scrollbar is also their height.
int thickness = scrollbarThickness(scrollbar->controlSize());
if (scrollbar->orientation() == HorizontalScrollbar) {
// Once the scrollbar becomes smaller than the natural size of the
// two buttons, the track disappears.
if (scrollbar->width() < 2 * thickness)
return IntRect();
return IntRect(scrollbar->x() + bs.width(), scrollbar->y(), scrollbar->width() - 2 * bs.width(), thickness);
}
if (scrollbar->height() < 2 * thickness)
return IntRect();
return IntRect(scrollbar->x(), scrollbar->y() + bs.height(), thickness, scrollbar->height() - 2 * bs.height());
}
void ScrollbarThemeChromium::paintTrackBackground(GraphicsContext* context, Scrollbar* scrollbar, const IntRect& rect)
{
// Just assume a forward track part. We only paint the track as a single piece when there is no thumb.
if (!hasThumb(scrollbar))
paintTrackPiece(context, scrollbar, rect, ForwardTrackPart);
}
void ScrollbarThemeChromium::paintTickmarks(GraphicsContext* context, Scrollbar* scrollbar, const IntRect& rect)
{
if (scrollbar->orientation() != VerticalScrollbar)
return;
if (rect.height() <= 0 || rect.width() <= 0)
return; // nothing to draw on.
// Get the tickmarks for the frameview.
Vector<IntRect> tickmarks;
scrollbar->scrollableArea()->getTickmarks(tickmarks);
if (!tickmarks.size())
return;
// Get the image for the tickmarks.
static RefPtr<Image> dash = Image::loadPlatformResource("tickmarkDash");
if (dash->isNull()) {
ASSERT_NOT_REACHED();
return;
}
context->save();
for (Vector<IntRect>::const_iterator i = tickmarks.begin(); i != tickmarks.end(); ++i) {
// Calculate how far down (in %) the tick-mark should appear.
const float percent = static_cast<float>(i->y()) / scrollbar->totalSize();
// Calculate how far down (in pixels) the tick-mark should appear.
const int yPos = rect.y() + (rect.height() * percent);
IntPoint tick(scrollbar->x(), yPos);
context->drawImage(dash.get(), ColorSpaceDeviceRGB, tick);
}
context->restore();
}
} // namespace WebCore
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