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/*
* Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
* Copyright (C) 2010 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER 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 "core/layout/LayoutSliderContainer.h"
#include "core/dom/shadow/ShadowRoot.h"
#include "core/html/HTMLInputElement.h"
#include "core/html/parser/HTMLParserIdioms.h"
#include "core/html/shadow/ShadowElementNames.h"
#include "core/html/shadow/SliderThumbElement.h"
#include "core/layout/LayoutFlexibleBox.h"
#include "core/layout/LayoutSlider.h"
#include "core/layout/LayoutTheme.h"
namespace blink {
LayoutSliderContainer::LayoutSliderContainer(SliderContainerElement* element)
: LayoutFlexibleBox(element)
{
}
inline static Decimal sliderPosition(HTMLInputElement* element)
{
const StepRange stepRange(element->createStepRange(RejectAny));
const Decimal oldValue = parseToDecimalForNumberType(element->value(), stepRange.defaultValue());
return stepRange.proportionFromValue(stepRange.clampValue(oldValue));
}
inline static bool hasVerticalAppearance(HTMLInputElement* input)
{
ASSERT(input->layoutObject());
const ComputedStyle& sliderStyle = input->layoutObject()->styleRef();
return sliderStyle.appearance() == SliderVerticalPart;
}
void LayoutSliderContainer::computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues& computedValues) const
{
HTMLInputElement* input = toHTMLInputElement(node()->shadowHost());
bool isVertical = hasVerticalAppearance(input);
if (input->layoutObject()->isSlider() && !isVertical && input->list()) {
int offsetFromCenter = LayoutTheme::theme().sliderTickOffsetFromTrackCenter();
LayoutUnit trackHeight;
if (offsetFromCenter < 0) {
trackHeight = LayoutUnit(-2 * offsetFromCenter);
} else {
int tickLength = LayoutTheme::theme().sliderTickSize().height();
trackHeight = LayoutUnit(2 * (offsetFromCenter + tickLength));
}
float zoomFactor = style()->effectiveZoom();
if (zoomFactor != 1.0)
trackHeight *= zoomFactor;
// FIXME: The trackHeight should have been added before updateLogicalHeight was called to avoid this hack.
setIntrinsicContentLogicalHeight(trackHeight);
LayoutBox::computeLogicalHeight(trackHeight, logicalTop, computedValues);
return;
}
if (isVertical)
logicalHeight = LayoutUnit(LayoutSlider::defaultTrackLength);
// FIXME: The trackHeight should have been added before updateLogicalHeight was called to avoid this hack.
setIntrinsicContentLogicalHeight(logicalHeight);
LayoutBox::computeLogicalHeight(logicalHeight, logicalTop, computedValues);
}
void LayoutSliderContainer::layout()
{
HTMLInputElement* input = toHTMLInputElement(node()->shadowHost());
bool isVertical = hasVerticalAppearance(input);
mutableStyleRef().setFlexDirection(isVertical ? FlowColumn : FlowRow);
TextDirection oldTextDirection = style()->direction();
if (isVertical) {
// FIXME: Work around rounding issues in RTL vertical sliders. We want them to
// render identically to LTR vertical sliders. We can remove this work around when
// subpixel rendering is enabled on all ports.
mutableStyleRef().setDirection(LTR);
}
Element* thumbElement = input->userAgentShadowRoot()->getElementById(ShadowElementNames::sliderThumb());
Element* trackElement = input->userAgentShadowRoot()->getElementById(ShadowElementNames::sliderTrack());
LayoutBox* thumb = thumbElement ? thumbElement->layoutBox() : 0;
LayoutBox* track = trackElement ? trackElement->layoutBox() : 0;
SubtreeLayoutScope layoutScope(*this);
// Force a layout to reset the position of the thumb so the code below doesn't move the thumb to the wrong place.
// FIXME: Make a custom layout class for the track and move the thumb positioning code there.
if (track)
layoutScope.setChildNeedsLayout(track);
LayoutFlexibleBox::layout();
mutableStyleRef().setDirection(oldTextDirection);
// These should always exist, unless someone mutates the shadow DOM (e.g., in the inspector).
if (!thumb || !track)
return;
double percentageOffset = sliderPosition(input).toDouble();
LayoutUnit availableExtent = isVertical ? track->contentHeight() : track->contentWidth();
availableExtent -= isVertical ? thumb->size().height() : thumb->size().width();
LayoutUnit offset(percentageOffset * availableExtent);
LayoutPoint thumbLocation = thumb->location();
if (isVertical)
thumbLocation.setY(thumbLocation.y() + track->contentHeight() - thumb->size().height() - offset);
else if (style()->isLeftToRightDirection())
thumbLocation.setX(thumbLocation.x() + offset);
else
thumbLocation.setX(thumbLocation.x() - offset);
thumb->setLocation(thumbLocation);
// We need one-off invalidation code here because painting of the timeline element does not go through style.
// Instead it has a custom implementation in C++ code.
// Therefore the style system cannot understand when it needs to be paint invalidated.
setShouldDoFullPaintInvalidation();
}
} // namespace blink
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