bool NodeRenderingContext::shouldCreateRenderer() const
{
ASSERT(m_location != LocationUndetermined);
ASSERT(parentNodeForRenderingAndStyle());
if (m_location == LocationNotInTree || m_phase == AttachContentLight)
return false;
RenderObject* parentRenderer = this->parentRenderer();
if (!parentRenderer)
return false;
if (m_location == LocationLightChild && m_phase == AttachStraight) {
// FIXME: Ignoring canHaveChildren() in a case of shadow children might be wrong.
// See https://bugs.webkit.org/show_bug.cgi?id=52423
if (!parentRenderer->canHaveChildren())
return false;
if (m_visualParentShadowRoot)
return false;
}
if (!m_parentNodeForRenderingAndStyle->childShouldCreateRenderer(m_node))
return false;
return true;
}
RenderBlock* RenderTextFragment::blockForAccompanyingFirstLetter() const
{
if (!m_firstLetter)
return 0;
for (RenderObject* block = m_firstLetter->parent(); block; block = block->parent()) {
if (block->style()->hasPseudoStyle(FIRST_LETTER) && block->canHaveChildren() && block->isRenderBlock())
return toRenderBlock(block);
}
return 0;
}
bool NodeRenderingContext::shouldCreateRenderer() const
{
if (!m_renderingParent)
return false;
RenderObject* parentRenderer = this->parentRenderer();
if (!parentRenderer)
return false;
if (!parentRenderer->canHaveChildren())
return false;
if (!m_renderingParent->childShouldCreateRenderer(*this))
return false;
return true;
}
bool Text::textRendererIsNeeded(const RenderStyle& style, const RenderObject& parent)
{
if (!parent.canHaveChildren())
return false;
if (isEditingText())
return true;
if (!length())
return false;
if (style.display() == NONE)
return false;
if (!containsOnlyWhitespace())
return true;
if (!canHaveWhitespaceChildren(parent))
return false;
if (style.preserveNewline()) // pre/pre-wrap/pre-line always make renderers.
return true;
const RenderObject* prev = NodeRenderingTraversal::previousSiblingRenderer(*this);
if (prev && prev->isBR()) // <span><br/> <br/></span>
return false;
if (parent.isRenderInline()) {
// <span><div/> <div/></span>
if (prev && !prev->isInline())
return false;
} else {
if (parent.isRenderBlock() && !parent.childrenInline() && (!prev || !prev->isInline()))
return false;
// Avoiding creation of a Renderer for the text node is a non-essential memory optimization.
// So to avoid blowing up on very wide DOMs, we limit the number of siblings to visit.
unsigned maxSiblingsToVisit = 50;
RenderObject* first = parent.slowFirstChild();
while (first && first->isFloatingOrOutOfFlowPositioned() && maxSiblingsToVisit--)
first = first->nextSibling();
if (!first || first == renderer() || NodeRenderingTraversal::nextSiblingRenderer(*this) == first)
// Whitespace at the start of a block just goes away. Don't even
// make a render object for this text.
return false;
}
return true;
}
bool NodeRenderingContext::shouldCreateRenderer() const
{
if (!m_node->document()->shouldCreateRenderers())
return false;
if (!m_renderingParent)
return false;
RenderObject* parentRenderer = this->parentRenderer();
if (!parentRenderer)
return false;
if (!parentRenderer->canHaveChildren() && !(m_node->isPseudoElement() && parentRenderer->canHaveGeneratedChildren()))
return false;
if (!m_renderingParent->childShouldCreateRenderer(*this))
return false;
return true;
}
static bool shouldCreateRenderer(const Element& element, const ContainerNode* renderingParent)
{
if (!element.document().shouldCreateRenderers())
return false;
if (!renderingParent)
return false;
RenderObject* parentRenderer = renderingParent->renderer();
if (!parentRenderer)
return false;
if (!parentRenderer->canHaveChildren() && !(element.isPseudoElement() && parentRenderer->canHaveGeneratedChildren()))
return false;
if (!renderingParent->childShouldCreateRenderer(&element))
return false;
return true;
}
bool NodeRenderingContext::shouldCreateRenderer() const
{
if (!m_node->document()->shouldCreateRenderers())
return false;
if (!m_parentDetails.node())
return false;
RenderObject* parentRenderer = this->parentRenderer();
if (!parentRenderer)
return false;
if (!parentRenderer->canHaveChildren())
return false;
if (!m_parentDetails.node()->childShouldCreateRenderer(*this))
return false;
return true;
}
bool NodeRenderingContext::shouldCreateRenderer() const
{
ASSERT(m_phase != Calculating);
ASSERT(parentNodeForRenderingAndStyle());
if (m_phase == AttachingNotInTree || m_phase == AttachingNotDistributed || m_phase == AttachingNotFallbacked)
return false;
RenderObject* parentRenderer = this->parentRenderer();
if (!parentRenderer)
return false;
if (!parentRenderer->canHaveChildren())
return false;
if (!m_parentNodeForRenderingAndStyle->childShouldCreateRenderer(*this))
return false;
return true;
}
static void createTextRendererIfNeeded(Text& textNode)
{
ASSERT(!textNode.renderer());
ContainerNode* renderingParentNode = NodeRenderingTraversal::parent(&textNode);
if (!renderingParentNode)
return;
RenderObject* parentRenderer = renderingParentNode->renderer();
if (!parentRenderer || !parentRenderer->canHaveChildren())
return;
if (!renderingParentNode->childShouldCreateRenderer(&textNode))
return;
Document& document = textNode.document();
RefPtr<RenderStyle> style;
bool resetStyleInheritance = textNode.parentNode()->isShadowRoot() && toShadowRoot(textNode.parentNode())->resetStyleInheritance();
if (resetStyleInheritance)
style = document.ensureStyleResolver().defaultStyleForElement();
else
style = parentRenderer->style();
if (!textRendererIsNeeded(textNode, *parentRenderer, *style))
return;
RenderText* newRenderer = textNode.createTextRenderer(document.renderArena(), style.get());
if (!newRenderer)
return;
if (!parentRenderer->isChildAllowed(newRenderer, style.get())) {
newRenderer->destroy();
return;
}
// Make sure the RenderObject already knows it is going to be added to a RenderFlowThread before we set the style
// for the first time. Otherwise code using inRenderFlowThread() in the styleWillChange and styleDidChange will fail.
newRenderer->setFlowThreadState(parentRenderer->flowThreadState());
RenderObject* nextRenderer = nextSiblingRenderer(textNode);
textNode.setRenderer(newRenderer);
// Parent takes care of the animations, no need to call setAnimatableStyle.
newRenderer->setStyle(style.release());
parentRenderer->addChild(newRenderer, nextRenderer);
Node* sibling = textNode.nextSibling();
if (sibling && !sibling->renderer() && sibling->attached())
createTextRenderersForSiblingsAfterAttachIfNeeded(sibling);
}
bool RenderTreeBuilder::shouldCreateRenderer() const
{
if (!m_renderingParent)
return false;
if (m_node->isSVGElement()) {
// SVG elements only render when inside <svg>, or if the element is an <svg> itself.
if (!isSVGSVGElement(*m_node) && !m_renderingParent->isSVGElement())
return false;
if (!toSVGElement(m_node)->isValid())
return false;
}
RenderObject* parentRenderer = this->parentRenderer();
if (!parentRenderer)
return false;
if (!parentRenderer->canHaveChildren())
return false;
return true;
}
// Check the specific case of elements that are children of regions but are flowed into a flow thread themselves.
bool NodeRenderingContext::elementInsideRegionNeedsRenderer()
{
Element* element = toElement(m_node);
bool elementInsideRegionNeedsRenderer = false;
RenderObject* parentRenderer = this->parentRenderer();
if ((parentRenderer && !parentRenderer->canHaveChildren() && parentRenderer->isRenderRegion())
|| (!parentRenderer && element->parentElement() && element->parentElement()->isInsideRegion())) {
if (!m_style)
m_style = element->styleForRenderer();
elementInsideRegionNeedsRenderer = element->shouldMoveToFlowThread(m_style.get());
// Children of this element will only be allowed to be flowed into other flow-threads if display is NOT none.
if (element->rendererIsNeeded(*this))
element->setIsInsideRegion(true);
}
return elementInsideRegionNeedsRenderer;
}
bool NodeRenderingContext::shouldCreateRenderer()
{
if (!m_node->document()->shouldCreateRenderers())
return false;
if (!m_renderingParent)
return false;
RenderObject* parentRenderer = this->parentRenderer();
if (!parentRenderer)
return false;
if (!parentRenderer->canHaveChildren()) {
if (parentRenderer->canDOMChildrenHaveRenderParent()) {
// In a region, only the children that need to be in a flow thread should have a renderer.
bool shouldBeInNamedFlow = m_node->isElementNode() && toElement(m_node)->moveToFlowThreadIsNeeded(m_style);
if (!shouldBeInNamedFlow)
return false;
} else
return false;
}
if (!m_renderingParent->childShouldCreateRenderer(*this))
return false;
return true;
}
