void RenderSlider::layout()
{
ASSERT(needsLayout());
SliderThumbElement* thumbElement = shadowSliderThumb();
RenderBox* thumb = thumbElement ? toRenderBox(thumbElement->renderer()) : 0;
IntSize baseSize(borderAndPaddingWidth(), borderAndPaddingHeight());
if (thumb) {
// Allow the theme to set the size of the thumb.
if (thumb->style()->hasAppearance()) {
// FIXME: This should pass the style, not the renderer, to the theme.
theme()->adjustSliderThumbSize(thumb);
}
baseSize.expand(thumb->style()->width().calcMinValue(0), thumb->style()->height().calcMinValue(0));
}
LayoutRepainter repainter(*this, checkForRepaintDuringLayout());
IntSize oldSize = size();
setSize(baseSize);
computeLogicalWidth();
computeLogicalHeight();
updateLayerTransform();
if (thumb) {
if (oldSize != size())
thumb->setChildNeedsLayout(true, false);
LayoutStateMaintainer statePusher(view(), this, IntSize(x(), y()), style()->isFlippedBlocksWritingMode());
IntRect oldThumbRect = thumb->frameRect();
thumb->layoutIfNeeded();
IntRect rect = thumbRect();
thumb->setFrameRect(rect);
if (thumb->checkForRepaintDuringLayout())
thumb->repaintDuringLayoutIfMoved(oldThumbRect);
statePusher.pop();
addOverflowFromChild(thumb);
}
repainter.repaintAfterLayout();
setNeedsLayout(false);
}
IntRect RenderSlider::thumbRect()
{
SliderThumbElement* thumbElement = shadowSliderThumb();
if (!thumbElement)
return IntRect();
IntRect thumbRect;
RenderBox* thumb = toRenderBox(thumbElement->renderer());
thumbRect.setWidth(thumb->style()->width().calcMinValue(contentWidth()));
thumbRect.setHeight(thumb->style()->height().calcMinValue(contentHeight()));
double fraction = sliderPosition(static_cast<HTMLInputElement*>(node()));
IntRect contentRect = contentBoxRect();
if (style()->appearance() == SliderVerticalPart || style()->appearance() == MediaVolumeSliderPart) {
thumbRect.setX(contentRect.x() + (contentRect.width() - thumbRect.width()) / 2);
thumbRect.setY(contentRect.y() + static_cast<int>(nextafter((contentRect.height() - thumbRect.height()) + 1, 0) * (1 - fraction)));
} else {
thumbRect.setX(contentRect.x() + static_cast<int>(nextafter((contentRect.width() - thumbRect.width()) + 1, 0) * fraction));
thumbRect.setY(contentRect.y() + (contentRect.height() - thumbRect.height()) / 2);
}
return thumbRect;
}
