ApplyBlockElementCommand.cpp [plain text]
#include "config.h"
#include "ApplyBlockElementCommand.h"
#include "HTMLBRElement.h"
#include "HTMLNames.h"
#include "RenderElement.h"
#include "RenderStyle.h"
#include "Text.h"
#include "VisibleUnits.h"
#include "htmlediting.h"
namespace WebCore {
using namespace HTMLNames;
ApplyBlockElementCommand::ApplyBlockElementCommand(Document& document, const QualifiedName& tagName, const AtomicString& inlineStyle)
: CompositeEditCommand(document)
, m_tagName(tagName)
, m_inlineStyle(inlineStyle)
{
}
ApplyBlockElementCommand::ApplyBlockElementCommand(Document& document, const QualifiedName& tagName)
: CompositeEditCommand(document)
, m_tagName(tagName)
{
}
void ApplyBlockElementCommand::doApply()
{
if (!endingSelection().rootEditableElement())
return;
VisiblePosition visibleEnd = endingSelection().visibleEnd();
VisiblePosition visibleStart = endingSelection().visibleStart();
if (visibleStart.isNull() || visibleStart.isOrphan() || visibleEnd.isNull() || visibleEnd.isOrphan())
return;
if (visibleEnd != visibleStart && isStartOfParagraph(visibleEnd)) {
VisibleSelection newSelection(visibleStart, visibleEnd.previous(CannotCrossEditingBoundary), endingSelection().isDirectional());
if (newSelection.isNone())
return;
setEndingSelection(newSelection);
}
VisibleSelection selection = selectionForParagraphIteration(endingSelection());
VisiblePosition startOfSelection = selection.visibleStart();
VisiblePosition endOfSelection = selection.visibleEnd();
ASSERT(!startOfSelection.isNull());
ASSERT(!endOfSelection.isNull());
RefPtr<ContainerNode> startScope;
int startIndex = indexForVisiblePosition(startOfSelection, startScope);
RefPtr<ContainerNode> endScope;
int endIndex = indexForVisiblePosition(endOfSelection, endScope);
formatSelection(startOfSelection, endOfSelection);
document().updateLayoutIgnorePendingStylesheets();
ASSERT(startScope == endScope);
ASSERT(startIndex >= 0);
ASSERT(startIndex <= endIndex);
if (startScope == endScope && startIndex >= 0 && startIndex <= endIndex) {
VisiblePosition start(visiblePositionForIndex(startIndex, startScope.get()));
VisiblePosition end(visiblePositionForIndex(endIndex, endScope.get()));
if (start.isNotNull() && end.isNull())
end = lastPositionInNode(endScope.get());
if (start.isNotNull() && end.isNotNull())
setEndingSelection(VisibleSelection(start, end, endingSelection().isDirectional()));
}
}
void ApplyBlockElementCommand::formatSelection(const VisiblePosition& startOfSelection, const VisiblePosition& endOfSelection)
{
Position start = startOfSelection.deepEquivalent().downstream();
if (isAtUnsplittableElement(start) && startOfParagraph(start) == endOfParagraph(endOfSelection)) {
auto blockquote = createBlockElement();
insertNodeAt(blockquote.copyRef(), start);
auto placeholder = HTMLBRElement::create(document());
appendNode(placeholder.copyRef(), WTFMove(blockquote));
setEndingSelection(VisibleSelection(positionBeforeNode(placeholder.ptr()), DOWNSTREAM, endingSelection().isDirectional()));
return;
}
RefPtr<Element> blockquoteForNextIndent;
VisiblePosition endOfCurrentParagraph = endOfParagraph(startOfSelection);
VisiblePosition endAfterSelection = endOfParagraph(endOfParagraph(endOfSelection).next());
m_endOfLastParagraph = endOfParagraph(endOfSelection).deepEquivalent();
bool atEnd = false;
Position end;
while (endOfCurrentParagraph != endAfterSelection && !atEnd) {
if (endOfCurrentParagraph.deepEquivalent() == m_endOfLastParagraph)
atEnd = true;
rangeForParagraphSplittingTextNodesIfNeeded(endOfCurrentParagraph, start, end);
endOfCurrentParagraph = end;
if (start == end && startOfBlock(start) != endOfBlock(start) && !isEndOfBlock(end) && start == startOfParagraph(endOfBlock(start))) {
endOfCurrentParagraph = endOfBlock(end);
end = endOfCurrentParagraph.deepEquivalent();
}
Position afterEnd = end.next();
Node* enclosingCell = enclosingNodeOfType(start, &isTableCell);
VisiblePosition endOfNextParagraph = endOfNextParagraphSplittingTextNodesIfNeeded(endOfCurrentParagraph, start, end);
formatRange(start, end, m_endOfLastParagraph, blockquoteForNextIndent);
if (enclosingCell && enclosingCell != enclosingNodeOfType(endOfNextParagraph.deepEquivalent(), &isTableCell))
blockquoteForNextIndent = nullptr;
if (endAfterSelection.isNotNull() && !endAfterSelection.deepEquivalent().anchorNode()->inDocument())
break;
if (endOfNextParagraph.isNotNull() && !endOfNextParagraph.deepEquivalent().anchorNode()->inDocument()) {
ASSERT_NOT_REACHED();
return;
}
endOfCurrentParagraph = endOfNextParagraph;
}
}
static bool isNewLineAtPosition(const Position& position)
{
Node* textNode = position.containerNode();
int offset = position.offsetInContainerNode();
if (!is<Text>(textNode) || offset < 0 || offset >= textNode->maxCharacterOffset())
return false;
ExceptionCode ec = 0;
String textAtPosition = downcast<Text>(*textNode).substringData(offset, 1, ec);
if (ec)
return false;
return textAtPosition[0] == '\n';
}
const RenderStyle* ApplyBlockElementCommand::renderStyleOfEnclosingTextNode(const Position& position)
{
if (position.anchorType() != Position::PositionIsOffsetInAnchor
|| !position.containerNode()
|| !position.containerNode()->isTextNode())
return nullptr;
document().updateStyleIfNeeded();
RenderObject* renderer = position.containerNode()->renderer();
if (!renderer)
return nullptr;
return &renderer->style();
}
void ApplyBlockElementCommand::rangeForParagraphSplittingTextNodesIfNeeded(const VisiblePosition& endOfCurrentParagraph, Position& start, Position& end)
{
start = startOfParagraph(endOfCurrentParagraph).deepEquivalent();
end = endOfCurrentParagraph.deepEquivalent();
bool isStartAndEndOnSameNode = false;
if (auto* startStyle = renderStyleOfEnclosingTextNode(start)) {
isStartAndEndOnSameNode = renderStyleOfEnclosingTextNode(end) && start.containerNode() == end.containerNode();
bool isStartAndEndOfLastParagraphOnSameNode = renderStyleOfEnclosingTextNode(m_endOfLastParagraph) && start.containerNode() == m_endOfLastParagraph.containerNode();
if (startStyle->preserveNewline() && isNewLineAtPosition(start) && !isNewLineAtPosition(start.previous()) && start.offsetInContainerNode() > 0)
start = startOfParagraph(end.previous()).deepEquivalent();
if (!startStyle->collapseWhiteSpace() && start.offsetInContainerNode() > 0) {
int startOffset = start.offsetInContainerNode();
Text* startText = start.containerText();
splitTextNode(startText, startOffset);
start = firstPositionInNode(startText);
if (isStartAndEndOnSameNode) {
ASSERT(end.offsetInContainerNode() >= startOffset);
end = Position(startText, end.offsetInContainerNode() - startOffset);
}
if (isStartAndEndOfLastParagraphOnSameNode) {
ASSERT(m_endOfLastParagraph.offsetInContainerNode() >= startOffset);
m_endOfLastParagraph = Position(startText, m_endOfLastParagraph.offsetInContainerNode() - startOffset);
}
}
}
if (auto* endStyle = renderStyleOfEnclosingTextNode(end)) {
bool isEndAndEndOfLastParagraphOnSameNode = renderStyleOfEnclosingTextNode(m_endOfLastParagraph) && end.deprecatedNode() == m_endOfLastParagraph.deprecatedNode();
if (endStyle->preserveNewline() && start == end && end.offsetInContainerNode() < end.containerNode()->maxCharacterOffset()) {
int endOffset = end.offsetInContainerNode();
if (!isNewLineAtPosition(end.previous()) && isNewLineAtPosition(end))
end = Position(end.containerText(), endOffset + 1);
if (isEndAndEndOfLastParagraphOnSameNode && end.offsetInContainerNode() >= m_endOfLastParagraph.offsetInContainerNode())
m_endOfLastParagraph = end;
}
if (endStyle->userModify() != READ_ONLY && !endStyle->collapseWhiteSpace() && end.offsetInContainerNode() && end.offsetInContainerNode() < end.containerNode()->maxCharacterOffset()) {
RefPtr<Text> endContainer = end.containerText();
splitTextNode(endContainer, end.offsetInContainerNode());
if (isStartAndEndOnSameNode)
start = firstPositionInOrBeforeNode(endContainer->previousSibling());
if (isEndAndEndOfLastParagraphOnSameNode) {
if (m_endOfLastParagraph.offsetInContainerNode() == end.offsetInContainerNode())
m_endOfLastParagraph = lastPositionInOrAfterNode(endContainer->previousSibling());
else
m_endOfLastParagraph = Position(endContainer, m_endOfLastParagraph.offsetInContainerNode() - end.offsetInContainerNode());
}
end = lastPositionInNode(endContainer->previousSibling());
}
}
}
VisiblePosition ApplyBlockElementCommand::endOfNextParagraphSplittingTextNodesIfNeeded(VisiblePosition& endOfCurrentParagraph, Position& start, Position& end)
{
VisiblePosition endOfNextParagraph = endOfParagraph(endOfCurrentParagraph.next());
Position position = endOfNextParagraph.deepEquivalent();
auto* style = renderStyleOfEnclosingTextNode(position);
if (!style)
return endOfNextParagraph;
RefPtr<Text> text = position.containerText();
if (!style->preserveNewline() || !position.offsetInContainerNode() || !isNewLineAtPosition(firstPositionInNode(text.get())))
return endOfNextParagraph;
splitTextNode(text, 1);
if (text == start.containerNode() && is<Text>(text->previousSibling())) {
ASSERT(start.offsetInContainerNode() < position.offsetInContainerNode());
start = Position(downcast<Text>(text->previousSibling()), start.offsetInContainerNode());
}
if (text == end.containerNode() && is<Text>(text->previousSibling())) {
ASSERT(end.offsetInContainerNode() < position.offsetInContainerNode());
end = Position(downcast<Text>(text->previousSibling()), end.offsetInContainerNode());
}
if (text == m_endOfLastParagraph.containerNode()) {
if (m_endOfLastParagraph.offsetInContainerNode() < position.offsetInContainerNode()) {
if (is<Text>(*text->previousSibling())
&& static_cast<unsigned>(m_endOfLastParagraph.offsetInContainerNode()) <= downcast<Text>(text->previousSibling())->length())
m_endOfLastParagraph = Position(downcast<Text>(text->previousSibling()), m_endOfLastParagraph.offsetInContainerNode());
} else
m_endOfLastParagraph = Position(text.get(), m_endOfLastParagraph.offsetInContainerNode() - 1);
}
return Position(text.get(), position.offsetInContainerNode() - 1);
}
Ref<HTMLElement> ApplyBlockElementCommand::createBlockElement()
{
auto element = createHTMLElement(document(), m_tagName);
if (m_inlineStyle.length())
element->setAttribute(styleAttr, m_inlineStyle);
return element;
}
}