void LayoutScrollbar::updateScrollbarPart(ScrollbarPart partType, bool destroy)
{
if (partType == NoPart)
return;
RefPtr<ComputedStyle> partStyle = !destroy ? getScrollbarPseudoStyle(partType, pseudoForScrollbarPart(partType)) : PassRefPtr<ComputedStyle>(nullptr);
bool needLayoutObject = !destroy && partStyle && partStyle->display() != NONE;
if (needLayoutObject && 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:
needLayoutObject = (buttonsPlacement == ScrollbarButtonsPlacementSingle || buttonsPlacement == ScrollbarButtonsPlacementDoubleStart
|| buttonsPlacement == ScrollbarButtonsPlacementDoubleBoth);
break;
case ForwardButtonStartPart:
needLayoutObject = (buttonsPlacement == ScrollbarButtonsPlacementDoubleStart || buttonsPlacement == ScrollbarButtonsPlacementDoubleBoth);
break;
case BackButtonEndPart:
needLayoutObject = (buttonsPlacement == ScrollbarButtonsPlacementDoubleEnd || buttonsPlacement == ScrollbarButtonsPlacementDoubleBoth);
break;
case ForwardButtonEndPart:
needLayoutObject = (buttonsPlacement == ScrollbarButtonsPlacementSingle || buttonsPlacement == ScrollbarButtonsPlacementDoubleEnd
|| buttonsPlacement == ScrollbarButtonsPlacementDoubleBoth);
break;
default:
break;
}
}
LayoutScrollbarPart* partLayoutObject = m_parts.get(partType);
if (!partLayoutObject && needLayoutObject) {
partLayoutObject = LayoutScrollbarPart::createAnonymous(&owningLayoutObject()->document(), this, partType);
m_parts.set(partType, partLayoutObject);
} else if (partLayoutObject && !needLayoutObject) {
m_parts.remove(partType);
partLayoutObject->destroy();
partLayoutObject = 0;
}
if (partLayoutObject)
partLayoutObject->setStyle(partStyle.release());
}
void LayoutScrollbar::updateScrollbarPart(ScrollbarPart partType,
bool destroy) {
if (partType == NoPart)
return;
RefPtr<ComputedStyle> partStyle =
!destroy
? getScrollbarPseudoStyle(partType, pseudoForScrollbarPart(partType))
: PassRefPtr<ComputedStyle>(nullptr);
bool needLayoutObject =
!destroy && partStyle && partStyle->display() != EDisplay::None;
if (needLayoutObject && partStyle->display() != EDisplay::Block) {
// See if we are a button that should not be visible according to OS
// settings.
WebScrollbarButtonsPlacement buttonsPlacement = theme().buttonsPlacement();
switch (partType) {
case BackButtonStartPart:
needLayoutObject =
(buttonsPlacement == WebScrollbarButtonsPlacementSingle ||
buttonsPlacement == WebScrollbarButtonsPlacementDoubleStart ||
buttonsPlacement == WebScrollbarButtonsPlacementDoubleBoth);
break;
case ForwardButtonStartPart:
needLayoutObject =
(buttonsPlacement == WebScrollbarButtonsPlacementDoubleStart ||
buttonsPlacement == WebScrollbarButtonsPlacementDoubleBoth);
break;
case BackButtonEndPart:
needLayoutObject =
(buttonsPlacement == WebScrollbarButtonsPlacementDoubleEnd ||
buttonsPlacement == WebScrollbarButtonsPlacementDoubleBoth);
break;
case ForwardButtonEndPart:
needLayoutObject =
(buttonsPlacement == WebScrollbarButtonsPlacementSingle ||
buttonsPlacement == WebScrollbarButtonsPlacementDoubleEnd ||
buttonsPlacement == WebScrollbarButtonsPlacementDoubleBoth);
break;
default:
break;
}
}
LayoutScrollbarPart* partLayoutObject = m_parts.get(partType);
if (!partLayoutObject && needLayoutObject && m_scrollableArea) {
partLayoutObject = LayoutScrollbarPart::createAnonymous(
&owningLayoutObject()->document(), m_scrollableArea, this, partType);
m_parts.set(partType, partLayoutObject);
setNeedsPaintInvalidation(partType);
} else if (partLayoutObject && !needLayoutObject) {
m_parts.remove(partType);
partLayoutObject->destroy();
partLayoutObject = nullptr;
if (!destroy)
setNeedsPaintInvalidation(partType);
}
if (partLayoutObject)
partLayoutObject->setStyleWithWritingModeOfParent(partStyle.release());
}