InsertParagraphSeparatorCommand.cpp [plain text]
#include "config.h"
#include "InsertParagraphSeparatorCommand.h"
#include "CSSPropertyNames.h"
#include "Document.h"
#include "EditingStyle.h"
#include "HTMLElement.h"
#include "HTMLNames.h"
#include "InsertLineBreakCommand.h"
#include "RenderObject.h"
#include "Text.h"
#include "htmlediting.h"
#include "visible_units.h"
namespace WebCore {
using namespace HTMLNames;
static Element* highestVisuallyEquivalentDivBelowRoot(Element* startBlock)
{
Element* curBlock = startBlock;
while (!curBlock->nextSibling() && curBlock->parentElement()->hasTagName(divTag) && curBlock->parentElement()->parentElement()) {
NamedNodeMap* attributes = curBlock->parentElement()->attributes(true);
if (attributes && !attributes->isEmpty())
break;
curBlock = curBlock->parentElement();
}
return curBlock;
}
InsertParagraphSeparatorCommand::InsertParagraphSeparatorCommand(Document *document, bool mustUseDefaultParagraphElement)
: CompositeEditCommand(document)
, m_mustUseDefaultParagraphElement(mustUseDefaultParagraphElement)
{
}
bool InsertParagraphSeparatorCommand::preservesTypingStyle() const
{
return true;
}
void InsertParagraphSeparatorCommand::calculateStyleBeforeInsertion(const Position &pos)
{
VisiblePosition visiblePos(pos, VP_DEFAULT_AFFINITY);
if (!isStartOfParagraph(visiblePos) && !isEndOfParagraph(visiblePos))
return;
ASSERT(pos.isNotNull());
m_style = EditingStyle::create(pos);
m_style->mergeTypingStyle(pos.anchorNode()->document());
}
void InsertParagraphSeparatorCommand::applyStyleAfterInsertion(Node* originalEnclosingBlock)
{
if (originalEnclosingBlock->hasTagName(h1Tag) ||
originalEnclosingBlock->hasTagName(h2Tag) ||
originalEnclosingBlock->hasTagName(h3Tag) ||
originalEnclosingBlock->hasTagName(h4Tag) ||
originalEnclosingBlock->hasTagName(h5Tag))
return;
if (!m_style)
return;
m_style->prepareToApplyAt(endingSelection().start());
if (!m_style->isEmpty())
applyStyle(m_style.get());
}
bool InsertParagraphSeparatorCommand::shouldUseDefaultParagraphElement(Node* enclosingBlock) const
{
if (m_mustUseDefaultParagraphElement)
return true;
if (!isEndOfBlock(endingSelection().visibleStart()))
return false;
return enclosingBlock->hasTagName(h1Tag) ||
enclosingBlock->hasTagName(h2Tag) ||
enclosingBlock->hasTagName(h3Tag) ||
enclosingBlock->hasTagName(h4Tag) ||
enclosingBlock->hasTagName(h5Tag);
}
void InsertParagraphSeparatorCommand::getAncestorsInsideBlock(const Node* insertionNode, Element* outerBlock, Vector<Element*>& ancestors)
{
ancestors.clear();
if (insertionNode != outerBlock) {
for (Element* n = insertionNode->parentElement(); n && n != outerBlock; n = n->parentElement())
ancestors.append(n);
}
}
PassRefPtr<Element> InsertParagraphSeparatorCommand::cloneHierarchyUnderNewBlock(const Vector<Element*>& ancestors, PassRefPtr<Element> blockToInsert)
{
RefPtr<Element> parent = blockToInsert;
for (size_t i = ancestors.size(); i != 0; --i) {
RefPtr<Element> child = ancestors[i - 1]->cloneElementWithoutChildren();
appendNode(child, parent);
parent = child.release();
}
return parent.release();
}
void InsertParagraphSeparatorCommand::doApply()
{
bool splitText = false;
if (!endingSelection().isNonOrphanedCaretOrRange())
return;
Position insertionPosition = endingSelection().start();
EAffinity affinity = endingSelection().affinity();
if (endingSelection().isRange()) {
calculateStyleBeforeInsertion(insertionPosition);
deleteSelection(false, true);
insertionPosition = endingSelection().start();
affinity = endingSelection().affinity();
}
Node* startBlockNode = enclosingBlock(insertionPosition.parentAnchoredEquivalent().containerNode());
Position canonicalPos = VisiblePosition(insertionPosition).deepEquivalent();
Element* startBlock = static_cast<Element*>(startBlockNode);
if (!startBlockNode
|| !startBlockNode->isElementNode()
|| !startBlock->parentNode()
|| isTableCell(startBlock)
|| startBlock->hasTagName(formTag)
|| (!canonicalPos.isNull() && canonicalPos.deprecatedNode()->renderer() && canonicalPos.deprecatedNode()->renderer()->isTable())
|| (!canonicalPos.isNull() && canonicalPos.deprecatedNode()->hasTagName(hrTag))) {
applyCommandToComposite(InsertLineBreakCommand::create(document()));
return;
}
insertionPosition = insertionPosition.upstream();
if (!insertionPosition.isCandidate())
insertionPosition = insertionPosition.downstream();
insertionPosition = positionAvoidingSpecialElementBoundary(insertionPosition);
VisiblePosition visiblePos(insertionPosition, affinity);
calculateStyleBeforeInsertion(insertionPosition);
if (breakOutOfEmptyListItem())
return;
bool isFirstInBlock = isStartOfBlock(visiblePos);
bool isLastInBlock = isEndOfBlock(visiblePos);
bool nestNewBlock = false;
RefPtr<Element> blockToInsert;
if (startBlock == startBlock->rootEditableElement()) {
blockToInsert = createDefaultParagraphElement(document());
nestNewBlock = true;
} else if (shouldUseDefaultParagraphElement(startBlock))
blockToInsert = createDefaultParagraphElement(document());
else
blockToInsert = startBlock->cloneElementWithoutChildren();
if (isLastInBlock) {
if (nestNewBlock) {
if (isFirstInBlock && !lineBreakExistsAtVisiblePosition(visiblePos)) {
RefPtr<Element> extraBlock = createDefaultParagraphElement(document());
appendNode(extraBlock, startBlock);
appendBlockPlaceholder(extraBlock);
}
appendNode(blockToInsert, startBlock);
} else {
if (Node* highestBlockquote = highestEnclosingNodeOfType(canonicalPos, &isMailBlockquote))
startBlock = static_cast<Element*>(highestBlockquote);
Element* siblingNode = startBlock;
if (blockToInsert->hasTagName(divTag))
siblingNode = highestVisuallyEquivalentDivBelowRoot(startBlock);
insertNodeAfter(blockToInsert, siblingNode);
}
Vector<Element*> ancestors;
getAncestorsInsideBlock(positionOutsideTabSpan(insertionPosition).deprecatedNode(), startBlock, ancestors);
RefPtr<Element> parent = cloneHierarchyUnderNewBlock(ancestors, blockToInsert);
appendBlockPlaceholder(parent);
setEndingSelection(VisibleSelection(firstPositionInNode(parent.get()), DOWNSTREAM));
return;
}
if (isFirstInBlock || !inSameBlock(visiblePos, visiblePos.previous())) {
Node *refNode;
insertionPosition = positionOutsideTabSpan(insertionPosition);
if (isFirstInBlock && !nestNewBlock)
refNode = startBlock;
else if (insertionPosition.deprecatedNode() == startBlock && nestNewBlock) {
refNode = startBlock->childNode(insertionPosition.deprecatedEditingOffset());
ASSERT(refNode); } else
refNode = insertionPosition.deprecatedNode();
insertionPosition = insertionPosition.downstream();
insertNodeBefore(blockToInsert, refNode);
Vector<Element*> ancestors;
getAncestorsInsideBlock(positionAvoidingSpecialElementBoundary(positionOutsideTabSpan(insertionPosition)).deprecatedNode(), startBlock, ancestors);
appendBlockPlaceholder(cloneHierarchyUnderNewBlock(ancestors, blockToInsert));
setEndingSelection(VisibleSelection(insertionPosition, DOWNSTREAM));
return;
}
if (isStartOfParagraph(visiblePos)) {
RefPtr<Element> br = createBreakElement(document());
insertNodeAt(br.get(), insertionPosition);
insertionPosition = positionInParentAfterNode(br.get());
if (visiblePos.deepEquivalent().anchorNode()->renderer()->isBR()) {
setEndingSelection(VisibleSelection(insertionPosition, DOWNSTREAM));
return;
}
}
insertionPosition = insertionPosition.downstream();
insertionPosition = positionOutsideTabSpan(VisiblePosition(insertionPosition).deepEquivalent());
Position leadingWhitespace = insertionPosition.leadingWhitespacePosition(VP_DEFAULT_AFFINITY);
if (leadingWhitespace.isNotNull() && leadingWhitespace.deprecatedNode()->isTextNode()) {
Text* textNode = static_cast<Text*>(leadingWhitespace.deprecatedNode());
ASSERT(!textNode->renderer() || textNode->renderer()->style()->collapseWhiteSpace());
replaceTextInNodePreservingMarkers(textNode, leadingWhitespace.deprecatedEditingOffset(), 1, nonBreakingSpaceString());
}
if (insertionPosition.deprecatedNode()->isTextNode()) {
Text* textNode = static_cast<Text*>(insertionPosition.deprecatedNode());
bool atEnd = (unsigned)insertionPosition.deprecatedEditingOffset() >= textNode->length();
if (insertionPosition.deprecatedEditingOffset() > 0 && !atEnd) {
splitTextNode(textNode, insertionPosition.deprecatedEditingOffset());
insertionPosition.moveToOffset(0);
visiblePos = VisiblePosition(insertionPosition);
splitText = true;
}
}
if (nestNewBlock)
appendNode(blockToInsert.get(), startBlock);
else
insertNodeAfter(blockToInsert.get(), startBlock);
updateLayout();
if (isEndOfParagraph(visiblePos) && !lineBreakExistsAtVisiblePosition(visiblePos))
appendNode(createBreakElement(document()).get(), blockToInsert.get());
if (VisiblePosition(insertionPosition) != VisiblePosition(positionBeforeNode(blockToInsert.get()))) {
Node* n;
if (insertionPosition.containerNode() == startBlock)
n = insertionPosition.computeNodeAfterPosition();
else {
splitTreeToNode(insertionPosition.containerNode(), startBlock);
for (n = startBlock->firstChild(); n; n = n->nextSibling()) {
if (comparePositions(VisiblePosition(insertionPosition), positionBeforeNode(n)) <= 0)
break;
}
}
while (n && n != blockToInsert) {
Node *next = n->nextSibling();
removeNode(n);
appendNode(n, blockToInsert);
n = next;
}
}
if (splitText) {
updateLayout();
if (insertionPosition.anchorType() == Position::PositionIsOffsetInAnchor)
insertionPosition.moveToOffset(0);
if (!insertionPosition.isRenderedCharacter()) {
ASSERT(!insertionPosition.deprecatedNode()->renderer() || insertionPosition.deprecatedNode()->renderer()->style()->collapseWhiteSpace());
deleteInsignificantTextDownstream(insertionPosition);
if (insertionPosition.deprecatedNode()->isTextNode())
insertTextIntoNode(static_cast<Text*>(insertionPosition.deprecatedNode()), 0, nonBreakingSpaceString());
}
}
setEndingSelection(VisibleSelection(firstPositionInNode(blockToInsert.get()), DOWNSTREAM));
applyStyleAfterInsertion(startBlock);
}
}