IntRect LayoutScrollbar::buttonRect(ScrollbarPart partType) const
{
LayoutScrollbarPart* partLayoutObject = m_parts.get(partType);
if (!partLayoutObject)
return IntRect();
partLayoutObject->layout();
bool isHorizontal = orientation() == HorizontalScrollbar;
if (partType == BackButtonStartPart)
return IntRect(location(), IntSize(isHorizontal ? partLayoutObject->pixelSnappedWidth() : width(), isHorizontal ? height() : partLayoutObject->pixelSnappedHeight()));
if (partType == ForwardButtonEndPart) {
return IntRect(isHorizontal ? x() + width() - partLayoutObject->pixelSnappedWidth() : x(),
isHorizontal ? y() : y() + height() - partLayoutObject->pixelSnappedHeight(),
isHorizontal ? partLayoutObject->pixelSnappedWidth() : width(),
isHorizontal ? height() : partLayoutObject->pixelSnappedHeight());
}
if (partType == ForwardButtonStartPart) {
IntRect previousButton = buttonRect(BackButtonStartPart);
return IntRect(isHorizontal ? x() + previousButton.width() : x(),
isHorizontal ? y() : y() + previousButton.height(),
isHorizontal ? partLayoutObject->pixelSnappedWidth() : width(),
isHorizontal ? height() : partLayoutObject->pixelSnappedHeight());
}
IntRect followingButton = buttonRect(ForwardButtonEndPart);
return IntRect(isHorizontal ? x() + width() - followingButton.width() - partLayoutObject->pixelSnappedWidth() : x(),
isHorizontal ? y() : y() + height() - followingButton.height() - partLayoutObject->pixelSnappedHeight(),
isHorizontal ? partLayoutObject->pixelSnappedWidth() : width(),
isHorizontal ? height() : partLayoutObject->pixelSnappedHeight());
}
int LayoutScrollbar::minimumThumbLength() const
{
LayoutScrollbarPart* partLayoutObject = m_parts.get(ThumbPart);
if (!partLayoutObject)
return 0;
partLayoutObject->layout();
return orientation() == HorizontalScrollbar ? partLayoutObject->size().width() : partLayoutObject->size().height();
}
IntRect LayoutScrollbar::trackPieceRectWithMargins(ScrollbarPart partType, const IntRect& oldRect) const
{
LayoutScrollbarPart* partLayoutObject = m_parts.get(partType);
if (!partLayoutObject)
return oldRect;
partLayoutObject->layout();
IntRect rect = oldRect;
if (orientation() == HorizontalScrollbar) {
rect.setX(rect.x() + partLayoutObject->marginLeft());
rect.setWidth(rect.width() - partLayoutObject->marginWidth());
} else {
rect.setY(rect.y() + partLayoutObject->marginTop());
rect.setHeight(rect.height() - partLayoutObject->marginHeight());
}
return rect;
}
IntRect LayoutScrollbar::trackRect(int startLength, int endLength) const {
LayoutScrollbarPart* part = m_parts.get(TrackBGPart);
if (part)
part->layout();
if (orientation() == HorizontalScrollbar) {
int marginLeft = part ? part->marginLeft().toInt() : 0;
int marginRight = part ? part->marginRight().toInt() : 0;
startLength += marginLeft;
endLength += marginRight;
int totalLength = startLength + endLength;
return IntRect(x() + startLength, y(), width() - totalLength, height());
}
int marginTop = part ? part->marginTop().toInt() : 0;
int marginBottom = part ? part->marginBottom().toInt() : 0;
startLength += marginTop;
endLength += marginBottom;
int totalLength = startLength + endLength;
return IntRect(x(), y() + startLength, width(), height() - totalLength);
}
void LayoutScrollbar::updateScrollbarParts(bool destroy) {
updateScrollbarPart(ScrollbarBGPart, destroy);
updateScrollbarPart(BackButtonStartPart, destroy);
updateScrollbarPart(ForwardButtonStartPart, destroy);
updateScrollbarPart(BackTrackPart, destroy);
updateScrollbarPart(ThumbPart, destroy);
updateScrollbarPart(ForwardTrackPart, destroy);
updateScrollbarPart(BackButtonEndPart, destroy);
updateScrollbarPart(ForwardButtonEndPart, destroy);
updateScrollbarPart(TrackBGPart, destroy);
if (destroy)
return;
// See if the scrollbar's thickness changed. If so, we need to mark our
// owning object as needing a layout.
bool isHorizontal = orientation() == HorizontalScrollbar;
int oldThickness = isHorizontal ? height() : width();
int newThickness = 0;
LayoutScrollbarPart* part = m_parts.get(ScrollbarBGPart);
if (part) {
part->layout();
newThickness =
(isHorizontal ? part->size().height() : part->size().width()).toInt();
}
if (newThickness != oldThickness) {
setFrameRect(
IntRect(location(), IntSize(isHorizontal ? width() : newThickness,
isHorizontal ? newThickness : height())));
if (LayoutBox* box = owningLayoutObjectWithinFrame()) {
if (box->isLayoutBlock())
toLayoutBlock(box)->notifyScrollbarThicknessChanged();
box->setChildNeedsLayout();
if (m_scrollableArea)
m_scrollableArea->setScrollCornerNeedsPaintInvalidation();
}
}
}