PassRefPtr<RenderStyle> RenderScrollbar::getScrollbarPseudoStyle(ScrollbarPart partType, PseudoId pseudoId)
{
s_styleResolvePart = partType;
s_styleResolveScrollbar = this;
RefPtr<RenderStyle> result = owningRenderer()->getUncachedPseudoStyle(pseudoId, owningRenderer()->style());
s_styleResolvePart = NoPart;
s_styleResolveScrollbar = 0;
return result;
}
PassRefPtr<RenderStyle> RenderScrollbar::getScrollbarPseudoStyle(ScrollbarPart partType, PseudoId pseudoId)
{
if (!owningRenderer())
return 0;
RefPtr<RenderStyle> result = owningRenderer()->getUncachedPseudoStyle(PseudoStyleRequest(pseudoId, this, partType), &owningRenderer()->style());
// Scrollbars for root frames should always have background color
// unless explicitly specified as transparent. So we force it.
// This is because WebKit assumes scrollbar to be always painted and missing background
// causes visual artifact like non-repainted dirty region.
if (result && m_owningFrame && m_owningFrame->view() && !m_owningFrame->view()->isTransparent() && !result->hasBackground())
result->setBackgroundColor(Color::white);
return result;
}
void RenderScrollbar::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;
RenderScrollbarPart* part = m_parts.get(ScrollbarBGPart);
if (part) {
part->layout();
newThickness = isHorizontal ? part->height() : part->width();
}
if (newThickness != oldThickness) {
setFrameRect(IntRect(x(), y(), isHorizontal ? width() : newThickness, isHorizontal ? newThickness : height()));
owningRenderer()->setChildNeedsLayout(true);
}
}
void RenderScrollbar::updateScrollbarPart(ScrollbarPart partType, bool destroy)
{
if (partType == NoPart)
return;
RefPtr<RenderStyle> partStyle = !destroy ? getScrollbarPseudoStyle(partType, pseudoForScrollbarPart(partType)) : PassRefPtr<RenderStyle>(0);
bool needRenderer = !destroy && partStyle && partStyle->display() != NONE && partStyle->visibility() == VISIBLE;
if (needRenderer && partStyle->display() != BLOCK) {
// See if we are a button that should not be visible according to OS settings.
ScrollbarButtonsPlacement buttonsPlacement = theme()->buttonsPlacement();
switch (partType) {
case BackButtonStartPart:
needRenderer = (buttonsPlacement == ScrollbarButtonsSingle || buttonsPlacement == ScrollbarButtonsDoubleStart ||
buttonsPlacement == ScrollbarButtonsDoubleBoth);
break;
case ForwardButtonStartPart:
needRenderer = (buttonsPlacement == ScrollbarButtonsDoubleStart || buttonsPlacement == ScrollbarButtonsDoubleBoth);
break;
case BackButtonEndPart:
needRenderer = (buttonsPlacement == ScrollbarButtonsDoubleEnd || buttonsPlacement == ScrollbarButtonsDoubleBoth);
break;
case ForwardButtonEndPart:
needRenderer = (buttonsPlacement == ScrollbarButtonsSingle || buttonsPlacement == ScrollbarButtonsDoubleEnd ||
buttonsPlacement == ScrollbarButtonsDoubleBoth);
break;
default:
break;
}
}
RenderScrollbarPart* partRenderer = m_parts.get(partType);
if (!partRenderer && needRenderer) {
partRenderer = new (owningRenderer()->renderArena()) RenderScrollbarPart(owningRenderer()->document(), this, partType);
m_parts.set(partType, partRenderer);
} else if (partRenderer && !needRenderer) {
m_parts.remove(partType);
partRenderer->destroy();
partRenderer = 0;
}
if (partRenderer)
partRenderer->setStyle(partStyle.release());
}
void RenderScrollbar::updateScrollbarPart(ScrollbarPart partType, bool destroy)
{
if (partType == NoPart)
return;
RefPtr<RenderStyle> partStyle = destroy ? nullptr : getScrollbarPseudoStyle(partType, pseudoForScrollbarPart(partType));
bool needRenderer = partStyle && partStyle->display() != NONE;
if (needRenderer && partStyle->display() != BLOCK) {
// See if we are a button that should not be visible according to OS settings.
ScrollbarButtonsPlacement buttonsPlacement = theme()->buttonsPlacement();
switch (partType) {
case BackButtonStartPart:
needRenderer = (buttonsPlacement == ScrollbarButtonsSingle || buttonsPlacement == ScrollbarButtonsDoubleStart ||
buttonsPlacement == ScrollbarButtonsDoubleBoth);
break;
case ForwardButtonStartPart:
needRenderer = (buttonsPlacement == ScrollbarButtonsDoubleStart || buttonsPlacement == ScrollbarButtonsDoubleBoth);
break;
case BackButtonEndPart:
needRenderer = (buttonsPlacement == ScrollbarButtonsDoubleEnd || buttonsPlacement == ScrollbarButtonsDoubleBoth);
break;
case ForwardButtonEndPart:
needRenderer = (buttonsPlacement == ScrollbarButtonsSingle || buttonsPlacement == ScrollbarButtonsDoubleEnd ||
buttonsPlacement == ScrollbarButtonsDoubleBoth);
break;
default:
break;
}
}
if (needRenderer) {
RenderScrollbarPart*& partRendererSlot = m_parts.add(partType, nullptr).iterator->value;
if (partRendererSlot)
partRendererSlot->setStyle(partStyle.releaseNonNull());
else {
partRendererSlot = new RenderScrollbarPart(owningRenderer()->document(), partStyle.releaseNonNull(), this, partType);
partRendererSlot->initializeStyle();
}
} else {
if (RenderScrollbarPart* partRenderer = m_parts.take(partType))
partRenderer->destroy();
}
}
void RenderScrollbar::updateScrollbarPart(ScrollbarPart partType)
{
if (partType == NoPart)
return;
std::unique_ptr<RenderStyle> partStyle = getScrollbarPseudoStyle(partType, pseudoForScrollbarPart(partType));
bool needRenderer = partStyle && partStyle->display() != NONE;
if (needRenderer && partStyle->display() != BLOCK) {
// See if we are a button that should not be visible according to OS settings.
ScrollbarButtonsPlacement buttonsPlacement = theme().buttonsPlacement();
switch (partType) {
case BackButtonStartPart:
needRenderer = (buttonsPlacement == ScrollbarButtonsSingle || buttonsPlacement == ScrollbarButtonsDoubleStart ||
buttonsPlacement == ScrollbarButtonsDoubleBoth);
break;
case ForwardButtonStartPart:
needRenderer = (buttonsPlacement == ScrollbarButtonsDoubleStart || buttonsPlacement == ScrollbarButtonsDoubleBoth);
break;
case BackButtonEndPart:
needRenderer = (buttonsPlacement == ScrollbarButtonsDoubleEnd || buttonsPlacement == ScrollbarButtonsDoubleBoth);
break;
case ForwardButtonEndPart:
needRenderer = (buttonsPlacement == ScrollbarButtonsSingle || buttonsPlacement == ScrollbarButtonsDoubleEnd ||
buttonsPlacement == ScrollbarButtonsDoubleBoth);
break;
default:
break;
}
}
if (!needRenderer) {
m_parts.remove(partType);
return;
}
if (auto& partRendererSlot = m_parts.add(partType, nullptr).iterator->value)
partRendererSlot->setStyle(WTFMove(*partStyle));
else {
partRendererSlot = createRenderer<RenderScrollbarPart>(owningRenderer()->document(), WTFMove(*partStyle), this, partType);
partRendererSlot->initializeStyle();
}
}