RenderTreePosition.cpp [plain text]
#include "config.h"
#include "RenderTreePosition.h"
#include "NodeRenderingTraversal.h"
#include "PseudoElement.h"
#include "RenderObject.h"
#include "ShadowRoot.h"
namespace WebCore {
void RenderTreePosition::computeNextSibling(const Node& node)
{
ASSERT(!node.renderer());
if (m_hasValidNextSibling) {
ASSERT(m_parent.isRenderView() || ++m_assertionLimitCounter > 20 || nextSiblingRenderer(node, m_parent) == m_nextSibling);
return;
}
m_nextSibling = nextSiblingRenderer(node, m_parent);
m_hasValidNextSibling = true;
}
void RenderTreePosition::invalidateNextSibling(const RenderObject& siblingRenderer)
{
if (!m_hasValidNextSibling)
return;
if (m_nextSibling == &siblingRenderer)
m_hasValidNextSibling = false;
}
RenderObject* RenderTreePosition::previousSiblingRenderer(const Text& textNode)
{
if (textNode.renderer())
return textNode.renderer()->previousSibling();
for (Node* sibling = NodeRenderingTraversal::previousSibling(&textNode); sibling; sibling = NodeRenderingTraversal::previousSibling(sibling)) {
RenderObject* renderer = sibling->renderer();
if (renderer && !RenderTreePosition::isRendererReparented(*renderer))
return renderer;
}
if (PseudoElement* before = textNode.parentElement()->beforePseudoElement())
return before->renderer();
return nullptr;
}
RenderObject* RenderTreePosition::nextSiblingRenderer(const Node& node, const RenderElement& parentRenderer)
{
if (!parentRenderer.element())
return nullptr;
if (node.isAfterPseudoElement())
return nullptr;
Node* sibling = node.isBeforePseudoElement() ? NodeRenderingTraversal::firstChild(parentRenderer.element()) : NodeRenderingTraversal::nextSibling(&node);
for (; sibling; sibling = NodeRenderingTraversal::nextSibling(sibling)) {
RenderObject* renderer = sibling->renderer();
if (renderer && !isRendererReparented(*renderer))
return renderer;
}
if (PseudoElement* after = parentRenderer.element()->afterPseudoElement())
return after->renderer();
return nullptr;
}
bool RenderTreePosition::isRendererReparented(const RenderObject& renderer)
{
if (!renderer.node()->isElementNode())
return false;
if (renderer.style().hasFlowInto())
return true;
return false;
}
}