| /* |
| * Copyright (C) 2005 Apple Computer, Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "core/editing/DeleteSelectionCommand.h" |
| |
| #include "HTMLNames.h" |
| #include "core/dom/Document.h" |
| #include "core/dom/Element.h" |
| #include "core/dom/NodeTraversal.h" |
| #include "core/dom/Text.h" |
| #include "core/editing/EditingBoundary.h" |
| #include "core/editing/Editor.h" |
| #include "core/editing/VisibleUnits.h" |
| #include "core/editing/htmlediting.h" |
| #include "core/html/HTMLInputElement.h" |
| #include "core/html/HTMLTableElement.h" |
| #include "core/frame/Frame.h" |
| #include "core/rendering/RenderTableCell.h" |
| |
| namespace WebCore { |
| |
| using namespace HTMLNames; |
| |
| static bool isTableRow(const Node* node) |
| { |
| return node && node->hasTagName(trTag); |
| } |
| |
| static bool isTableCellEmpty(Node* cell) |
| { |
| ASSERT(isTableCell(cell)); |
| return VisiblePosition(firstPositionInNode(cell)) == VisiblePosition(lastPositionInNode(cell)); |
| } |
| |
| static bool isTableRowEmpty(Node* row) |
| { |
| if (!isTableRow(row)) |
| return false; |
| |
| for (Node* child = row->firstChild(); child; child = child->nextSibling()) |
| if (isTableCell(child) && !isTableCellEmpty(child)) |
| return false; |
| |
| return true; |
| } |
| |
| DeleteSelectionCommand::DeleteSelectionCommand(Document& document, bool smartDelete, bool mergeBlocksAfterDelete, bool replace, bool expandForSpecialElements, bool sanitizeMarkup) |
| : CompositeEditCommand(document) |
| , m_hasSelectionToDelete(false) |
| , m_smartDelete(smartDelete) |
| , m_mergeBlocksAfterDelete(mergeBlocksAfterDelete) |
| , m_needPlaceholder(false) |
| , m_replace(replace) |
| , m_expandForSpecialElements(expandForSpecialElements) |
| , m_pruneStartBlockIfNecessary(false) |
| , m_startsAtEmptyLine(false) |
| , m_sanitizeMarkup(sanitizeMarkup) |
| , m_startBlock(0) |
| , m_endBlock(0) |
| , m_typingStyle(0) |
| , m_deleteIntoBlockquoteStyle(0) |
| { |
| } |
| |
| DeleteSelectionCommand::DeleteSelectionCommand(const VisibleSelection& selection, bool smartDelete, bool mergeBlocksAfterDelete, bool replace, bool expandForSpecialElements, bool sanitizeMarkup) |
| : CompositeEditCommand(*selection.start().document()) |
| , m_hasSelectionToDelete(true) |
| , m_smartDelete(smartDelete) |
| , m_mergeBlocksAfterDelete(mergeBlocksAfterDelete) |
| , m_needPlaceholder(false) |
| , m_replace(replace) |
| , m_expandForSpecialElements(expandForSpecialElements) |
| , m_pruneStartBlockIfNecessary(false) |
| , m_startsAtEmptyLine(false) |
| , m_sanitizeMarkup(sanitizeMarkup) |
| , m_selectionToDelete(selection) |
| , m_startBlock(0) |
| , m_endBlock(0) |
| , m_typingStyle(0) |
| , m_deleteIntoBlockquoteStyle(0) |
| { |
| } |
| |
| void DeleteSelectionCommand::initializeStartEnd(Position& start, Position& end) |
| { |
| Node* startSpecialContainer = 0; |
| Node* endSpecialContainer = 0; |
| |
| start = m_selectionToDelete.start(); |
| end = m_selectionToDelete.end(); |
| |
| // For HRs, we'll get a position at (HR,1) when hitting delete from the beginning of the previous line, or (HR,0) when forward deleting, |
| // but in these cases, we want to delete it, so manually expand the selection |
| if (start.deprecatedNode()->hasTagName(hrTag)) |
| start = positionBeforeNode(start.deprecatedNode()); |
| else if (end.deprecatedNode()->hasTagName(hrTag)) |
| end = positionAfterNode(end.deprecatedNode()); |
| |
| // FIXME: This is only used so that moveParagraphs can avoid the bugs in special element expansion. |
| if (!m_expandForSpecialElements) |
| return; |
| |
| while (1) { |
| startSpecialContainer = 0; |
| endSpecialContainer = 0; |
| |
| Position s = positionBeforeContainingSpecialElement(start, &startSpecialContainer); |
| Position e = positionAfterContainingSpecialElement(end, &endSpecialContainer); |
| |
| if (!startSpecialContainer && !endSpecialContainer) |
| break; |
| |
| if (VisiblePosition(start) != m_selectionToDelete.visibleStart() || VisiblePosition(end) != m_selectionToDelete.visibleEnd()) |
| break; |
| |
| // If we're going to expand to include the startSpecialContainer, it must be fully selected. |
| if (startSpecialContainer && !endSpecialContainer && comparePositions(positionInParentAfterNode(startSpecialContainer), end) > -1) |
| break; |
| |
| // If we're going to expand to include the endSpecialContainer, it must be fully selected. |
| if (endSpecialContainer && !startSpecialContainer && comparePositions(start, positionInParentBeforeNode(endSpecialContainer)) > -1) |
| break; |
| |
| if (startSpecialContainer && startSpecialContainer->isDescendantOf(endSpecialContainer)) |
| // Don't adjust the end yet, it is the end of a special element that contains the start |
| // special element (which may or may not be fully selected). |
| start = s; |
| else if (endSpecialContainer && endSpecialContainer->isDescendantOf(startSpecialContainer)) |
| // Don't adjust the start yet, it is the start of a special element that contains the end |
| // special element (which may or may not be fully selected). |
| end = e; |
| else { |
| start = s; |
| end = e; |
| } |
| } |
| } |
| |
| void DeleteSelectionCommand::setStartingSelectionOnSmartDelete(const Position& start, const Position& end) |
| { |
| VisiblePosition newBase; |
| VisiblePosition newExtent; |
| if (startingSelection().isBaseFirst()) { |
| newBase = start; |
| newExtent = end; |
| } else { |
| newBase = end; |
| newExtent = start; |
| } |
| setStartingSelection(VisibleSelection(newBase, newExtent, startingSelection().isDirectional())); |
| } |
| |
| void DeleteSelectionCommand::initializePositionData() |
| { |
| Position start, end; |
| initializeStartEnd(start, end); |
| |
| m_upstreamStart = start.upstream(); |
| m_downstreamStart = start.downstream(); |
| m_upstreamEnd = end.upstream(); |
| m_downstreamEnd = end.downstream(); |
| |
| m_startRoot = editableRootForPosition(start); |
| m_endRoot = editableRootForPosition(end); |
| |
| m_startTableRow = enclosingNodeOfType(start, &isTableRow); |
| m_endTableRow = enclosingNodeOfType(end, &isTableRow); |
| |
| // Don't move content out of a table cell. |
| // If the cell is non-editable, enclosingNodeOfType won't return it by default, so |
| // tell that function that we don't care if it returns non-editable nodes. |
| Node* startCell = enclosingNodeOfType(m_upstreamStart, &isTableCell, CanCrossEditingBoundary); |
| Node* endCell = enclosingNodeOfType(m_downstreamEnd, &isTableCell, CanCrossEditingBoundary); |
| // FIXME: This isn't right. A borderless table with two rows and a single column would appear as two paragraphs. |
| if (endCell && endCell != startCell) |
| m_mergeBlocksAfterDelete = false; |
| |
| // Usually the start and the end of the selection to delete are pulled together as a result of the deletion. |
| // Sometimes they aren't (like when no merge is requested), so we must choose one position to hold the caret |
| // and receive the placeholder after deletion. |
| VisiblePosition visibleEnd(m_downstreamEnd); |
| if (m_mergeBlocksAfterDelete && !isEndOfParagraph(visibleEnd)) |
| m_endingPosition = m_downstreamEnd; |
| else |
| m_endingPosition = m_downstreamStart; |
| |
| // We don't want to merge into a block if it will mean changing the quote level of content after deleting |
| // selections that contain a whole number paragraphs plus a line break, since it is unclear to most users |
| // that such a selection actually ends at the start of the next paragraph. This matches TextEdit behavior |
| // for indented paragraphs. |
| // Only apply this rule if the endingSelection is a range selection. If it is a caret, then other operations have created |
| // the selection we're deleting (like the process of creating a selection to delete during a backspace), and the user isn't in the situation described above. |
| if (numEnclosingMailBlockquotes(start) != numEnclosingMailBlockquotes(end) |
| && isStartOfParagraph(visibleEnd) && isStartOfParagraph(VisiblePosition(start)) |
| && endingSelection().isRange()) { |
| m_mergeBlocksAfterDelete = false; |
| m_pruneStartBlockIfNecessary = true; |
| } |
| |
| // Handle leading and trailing whitespace, as well as smart delete adjustments to the selection |
| m_leadingWhitespace = m_upstreamStart.leadingWhitespacePosition(m_selectionToDelete.affinity()); |
| m_trailingWhitespace = m_downstreamEnd.trailingWhitespacePosition(VP_DEFAULT_AFFINITY); |
| |
| if (m_smartDelete) { |
| |
| // skip smart delete if the selection to delete already starts or ends with whitespace |
| Position pos = VisiblePosition(m_upstreamStart, m_selectionToDelete.affinity()).deepEquivalent(); |
| bool skipSmartDelete = pos.trailingWhitespacePosition(VP_DEFAULT_AFFINITY, true).isNotNull(); |
| if (!skipSmartDelete) |
| skipSmartDelete = m_downstreamEnd.leadingWhitespacePosition(VP_DEFAULT_AFFINITY, true).isNotNull(); |
| |
| // extend selection upstream if there is whitespace there |
| bool hasLeadingWhitespaceBeforeAdjustment = m_upstreamStart.leadingWhitespacePosition(m_selectionToDelete.affinity(), true).isNotNull(); |
| if (!skipSmartDelete && hasLeadingWhitespaceBeforeAdjustment) { |
| VisiblePosition visiblePos = VisiblePosition(m_upstreamStart, VP_DEFAULT_AFFINITY).previous(); |
| pos = visiblePos.deepEquivalent(); |
| // Expand out one character upstream for smart delete and recalculate |
| // positions based on this change. |
| m_upstreamStart = pos.upstream(); |
| m_downstreamStart = pos.downstream(); |
| m_leadingWhitespace = m_upstreamStart.leadingWhitespacePosition(visiblePos.affinity()); |
| |
| setStartingSelectionOnSmartDelete(m_upstreamStart, m_upstreamEnd); |
| } |
| |
| // trailing whitespace is only considered for smart delete if there is no leading |
| // whitespace, as in the case where you double-click the first word of a paragraph. |
| if (!skipSmartDelete && !hasLeadingWhitespaceBeforeAdjustment && m_downstreamEnd.trailingWhitespacePosition(VP_DEFAULT_AFFINITY, true).isNotNull()) { |
| // Expand out one character downstream for smart delete and recalculate |
| // positions based on this change. |
| pos = VisiblePosition(m_downstreamEnd, VP_DEFAULT_AFFINITY).next().deepEquivalent(); |
| m_upstreamEnd = pos.upstream(); |
| m_downstreamEnd = pos.downstream(); |
| m_trailingWhitespace = m_downstreamEnd.trailingWhitespacePosition(VP_DEFAULT_AFFINITY); |
| |
| setStartingSelectionOnSmartDelete(m_downstreamStart, m_downstreamEnd); |
| } |
| } |
| |
| // We must pass call parentAnchoredEquivalent on the positions since some editing positions |
| // that appear inside their nodes aren't really inside them. [hr, 0] is one example. |
| // FIXME: parentAnchoredEquivalent should eventually be moved into enclosing element getters |
| // like the one below, since editing functions should obviously accept editing positions. |
| // FIXME: Passing false to enclosingNodeOfType tells it that it's OK to return a non-editable |
| // node. This was done to match existing behavior, but it seems wrong. |
| m_startBlock = enclosingNodeOfType(m_downstreamStart.parentAnchoredEquivalent(), &isBlock, CanCrossEditingBoundary); |
| m_endBlock = enclosingNodeOfType(m_upstreamEnd.parentAnchoredEquivalent(), &isBlock, CanCrossEditingBoundary); |
| } |
| |
| // We don't want to inherit style from an element which can't have contents. |
| static bool shouldNotInheritStyleFrom(const Node& node) |
| { |
| return !node.canContainRangeEndPoint(); |
| } |
| |
| void DeleteSelectionCommand::saveTypingStyleState() |
| { |
| // A common case is deleting characters that are all from the same text node. In |
| // that case, the style at the start of the selection before deletion will be the |
| // same as the style at the start of the selection after deletion (since those |
| // two positions will be identical). Therefore there is no need to save the |
| // typing style at the start of the selection, nor is there a reason to |
| // compute the style at the start of the selection after deletion (see the |
| // early return in calculateTypingStyleAfterDelete). |
| if (m_upstreamStart.deprecatedNode() == m_downstreamEnd.deprecatedNode() && m_upstreamStart.deprecatedNode()->isTextNode()) |
| return; |
| |
| if (shouldNotInheritStyleFrom(*m_selectionToDelete.start().anchorNode())) |
| return; |
| |
| // Figure out the typing style in effect before the delete is done. |
| m_typingStyle = EditingStyle::create(m_selectionToDelete.start(), EditingStyle::EditingPropertiesInEffect); |
| m_typingStyle->removeStyleAddedByNode(enclosingAnchorElement(m_selectionToDelete.start())); |
| |
| // If we're deleting into a Mail blockquote, save the style at end() instead of start() |
| // We'll use this later in computeTypingStyleAfterDelete if we end up outside of a Mail blockquote |
| if (enclosingNodeOfType(m_selectionToDelete.start(), isMailBlockquote)) |
| m_deleteIntoBlockquoteStyle = EditingStyle::create(m_selectionToDelete.end()); |
| else |
| m_deleteIntoBlockquoteStyle = 0; |
| } |
| |
| bool DeleteSelectionCommand::handleSpecialCaseBRDelete() |
| { |
| Node* nodeAfterUpstreamStart = m_upstreamStart.computeNodeAfterPosition(); |
| Node* nodeAfterDownstreamStart = m_downstreamStart.computeNodeAfterPosition(); |
| // Upstream end will appear before BR due to canonicalization |
| Node* nodeAfterUpstreamEnd = m_upstreamEnd.computeNodeAfterPosition(); |
| |
| if (!nodeAfterUpstreamStart || !nodeAfterDownstreamStart) |
| return false; |
| |
| // Check for special-case where the selection contains only a BR on a line by itself after another BR. |
| bool upstreamStartIsBR = nodeAfterUpstreamStart->hasTagName(brTag); |
| bool downstreamStartIsBR = nodeAfterDownstreamStart->hasTagName(brTag); |
| bool isBROnLineByItself = upstreamStartIsBR && downstreamStartIsBR && nodeAfterDownstreamStart == nodeAfterUpstreamEnd; |
| if (isBROnLineByItself) { |
| removeNode(nodeAfterDownstreamStart); |
| return true; |
| } |
| |
| // FIXME: This code doesn't belong in here. |
| // We detect the case where the start is an empty line consisting of BR not wrapped in a block element. |
| if (upstreamStartIsBR && downstreamStartIsBR && !(isStartOfBlock(positionBeforeNode(nodeAfterUpstreamStart)) && isEndOfBlock(positionAfterNode(nodeAfterUpstreamStart)))) { |
| m_startsAtEmptyLine = true; |
| m_endingPosition = m_downstreamEnd; |
| } |
| |
| return false; |
| } |
| |
| static Position firstEditablePositionInNode(Node* node) |
| { |
| ASSERT(node); |
| Node* next = node; |
| while (next && !next->rendererIsEditable()) |
| next = NodeTraversal::next(*next, node); |
| return next ? firstPositionInOrBeforeNode(next) : Position(); |
| } |
| |
| void DeleteSelectionCommand::removeNode(PassRefPtr<Node> node, ShouldAssumeContentIsAlwaysEditable shouldAssumeContentIsAlwaysEditable) |
| { |
| if (!node) |
| return; |
| |
| if (m_startRoot != m_endRoot && !(node->isDescendantOf(m_startRoot.get()) && node->isDescendantOf(m_endRoot.get()))) { |
| // If a node is not in both the start and end editable roots, remove it only if its inside an editable region. |
| if (!node->parentNode()->rendererIsEditable()) { |
| // Don't remove non-editable atomic nodes. |
| if (!node->firstChild()) |
| return; |
| // Search this non-editable region for editable regions to empty. |
| RefPtr<Node> child = node->firstChild(); |
| while (child) { |
| RefPtr<Node> nextChild = child->nextSibling(); |
| removeNode(child.get(), shouldAssumeContentIsAlwaysEditable); |
| // Bail if nextChild is no longer node's child. |
| if (nextChild && nextChild->parentNode() != node) |
| return; |
| child = nextChild; |
| } |
| |
| // Don't remove editable regions that are inside non-editable ones, just clear them. |
| return; |
| } |
| } |
| |
| if (isTableStructureNode(node.get()) || node->isRootEditableElement()) { |
| // Do not remove an element of table structure; remove its contents. |
| // Likewise for the root editable element. |
| Node* child = node->firstChild(); |
| while (child) { |
| Node* remove = child; |
| child = child->nextSibling(); |
| removeNode(remove, shouldAssumeContentIsAlwaysEditable); |
| } |
| |
| // Make sure empty cell has some height, if a placeholder can be inserted. |
| document().updateLayoutIgnorePendingStylesheets(); |
| RenderObject *r = node->renderer(); |
| if (r && r->isTableCell() && toRenderTableCell(r)->contentHeight() <= 0) { |
| Position firstEditablePosition = firstEditablePositionInNode(node.get()); |
| if (firstEditablePosition.isNotNull()) |
| insertBlockPlaceholder(firstEditablePosition); |
| } |
| return; |
| } |
| |
| if (node == m_startBlock && !isEndOfBlock(VisiblePosition(firstPositionInNode(m_startBlock.get())).previous())) |
| m_needPlaceholder = true; |
| else if (node == m_endBlock && !isStartOfBlock(VisiblePosition(lastPositionInNode(m_startBlock.get())).next())) |
| m_needPlaceholder = true; |
| |
| // FIXME: Update the endpoints of the range being deleted. |
| updatePositionForNodeRemoval(m_endingPosition, node.get()); |
| updatePositionForNodeRemoval(m_leadingWhitespace, node.get()); |
| updatePositionForNodeRemoval(m_trailingWhitespace, node.get()); |
| |
| CompositeEditCommand::removeNode(node, shouldAssumeContentIsAlwaysEditable); |
| } |
| |
| static void updatePositionForTextRemoval(Node* node, int offset, int count, Position& position) |
| { |
| if (position.anchorType() != Position::PositionIsOffsetInAnchor || position.containerNode() != node) |
| return; |
| |
| if (position.offsetInContainerNode() > offset + count) |
| position.moveToOffset(position.offsetInContainerNode() - count); |
| else if (position.offsetInContainerNode() > offset) |
| position.moveToOffset(offset); |
| } |
| |
| void DeleteSelectionCommand::deleteTextFromNode(PassRefPtr<Text> node, unsigned offset, unsigned count) |
| { |
| // FIXME: Update the endpoints of the range being deleted. |
| updatePositionForTextRemoval(node.get(), offset, count, m_endingPosition); |
| updatePositionForTextRemoval(node.get(), offset, count, m_leadingWhitespace); |
| updatePositionForTextRemoval(node.get(), offset, count, m_trailingWhitespace); |
| updatePositionForTextRemoval(node.get(), offset, count, m_downstreamEnd); |
| |
| CompositeEditCommand::deleteTextFromNode(node, offset, count); |
| } |
| |
| void DeleteSelectionCommand::makeStylingElementsDirectChildrenOfEditableRootToPreventStyleLoss() |
| { |
| RefPtr<Range> range = m_selectionToDelete.toNormalizedRange(); |
| RefPtr<Node> node = range->firstNode(); |
| while (node && node != range->pastLastNode()) { |
| RefPtr<Node> nextNode = NodeTraversal::next(*node); |
| if ((node->hasTagName(styleTag) && !(toElement(node)->hasAttribute(scopedAttr))) || node->hasTagName(linkTag)) { |
| nextNode = NodeTraversal::nextSkippingChildren(*node); |
| RefPtr<ContainerNode> rootEditableElement = node->rootEditableElement(); |
| if (rootEditableElement.get()) { |
| removeNode(node); |
| appendNode(node, rootEditableElement); |
| } |
| } |
| node = nextNode; |
| } |
| } |
| |
| void DeleteSelectionCommand::handleGeneralDelete() |
| { |
| if (m_upstreamStart.isNull()) |
| return; |
| |
| int startOffset = m_upstreamStart.deprecatedEditingOffset(); |
| Node* startNode = m_upstreamStart.deprecatedNode(); |
| ASSERT(startNode); |
| |
| makeStylingElementsDirectChildrenOfEditableRootToPreventStyleLoss(); |
| |
| // Never remove the start block unless it's a table, in which case we won't merge content in. |
| if (startNode->isSameNode(m_startBlock.get()) && !startOffset && canHaveChildrenForEditing(startNode) && !isHTMLTableElement(startNode)) { |
| startOffset = 0; |
| startNode = NodeTraversal::next(*startNode); |
| if (!startNode) |
| return; |
| } |
| |
| if (startOffset >= caretMaxOffset(startNode) && startNode->isTextNode()) { |
| Text* text = toText(startNode); |
| if (text->length() > (unsigned)caretMaxOffset(startNode)) |
| deleteTextFromNode(text, caretMaxOffset(startNode), text->length() - caretMaxOffset(startNode)); |
| } |
| |
| if (startOffset >= lastOffsetForEditing(startNode)) { |
| startNode = NodeTraversal::nextSkippingChildren(*startNode); |
| startOffset = 0; |
| } |
| |
| // Done adjusting the start. See if we're all done. |
| if (!startNode) |
| return; |
| |
| if (startNode == m_downstreamEnd.deprecatedNode()) { |
| if (m_downstreamEnd.deprecatedEditingOffset() - startOffset > 0) { |
| if (startNode->isTextNode()) { |
| // in a text node that needs to be trimmed |
| Text* text = toText(startNode); |
| deleteTextFromNode(text, startOffset, m_downstreamEnd.deprecatedEditingOffset() - startOffset); |
| } else { |
| removeChildrenInRange(startNode, startOffset, m_downstreamEnd.deprecatedEditingOffset()); |
| m_endingPosition = m_upstreamStart; |
| } |
| } |
| |
| // The selection to delete is all in one node. |
| if (!startNode->renderer() || (!startOffset && m_downstreamEnd.atLastEditingPositionForNode())) |
| removeNode(startNode); |
| } |
| else { |
| bool startNodeWasDescendantOfEndNode = m_upstreamStart.deprecatedNode()->isDescendantOf(m_downstreamEnd.deprecatedNode()); |
| // The selection to delete spans more than one node. |
| RefPtr<Node> node(startNode); |
| |
| if (startOffset > 0) { |
| if (startNode->isTextNode()) { |
| // in a text node that needs to be trimmed |
| Text* text = toText(node); |
| deleteTextFromNode(text, startOffset, text->length() - startOffset); |
| node = NodeTraversal::next(*node); |
| } else { |
| node = startNode->childNode(startOffset); |
| } |
| } else if (startNode == m_upstreamEnd.deprecatedNode() && startNode->isTextNode()) { |
| Text* text = toText(m_upstreamEnd.deprecatedNode()); |
| deleteTextFromNode(text, 0, m_upstreamEnd.deprecatedEditingOffset()); |
| } |
| |
| // handle deleting all nodes that are completely selected |
| while (node && node != m_downstreamEnd.deprecatedNode()) { |
| if (comparePositions(firstPositionInOrBeforeNode(node.get()), m_downstreamEnd) >= 0) { |
| // NodeTraversal::nextSkippingChildren just blew past the end position, so stop deleting |
| node = 0; |
| } else if (!m_downstreamEnd.deprecatedNode()->isDescendantOf(node.get())) { |
| RefPtr<Node> nextNode = NodeTraversal::nextSkippingChildren(*node); |
| // if we just removed a node from the end container, update end position so the |
| // check above will work |
| updatePositionForNodeRemoval(m_downstreamEnd, node.get()); |
| removeNode(node.get()); |
| node = nextNode.get(); |
| } else { |
| Node& n = node->lastDescendant(); |
| if (m_downstreamEnd.deprecatedNode() == n && m_downstreamEnd.deprecatedEditingOffset() >= caretMaxOffset(&n)) { |
| removeNode(node.get()); |
| node = 0; |
| } else { |
| node = NodeTraversal::next(*node); |
| } |
| } |
| } |
| |
| if (m_downstreamEnd.deprecatedNode() != startNode && !m_upstreamStart.deprecatedNode()->isDescendantOf(m_downstreamEnd.deprecatedNode()) && m_downstreamEnd.inDocument() && m_downstreamEnd.deprecatedEditingOffset() >= caretMinOffset(m_downstreamEnd.deprecatedNode())) { |
| if (m_downstreamEnd.atLastEditingPositionForNode() && !canHaveChildrenForEditing(m_downstreamEnd.deprecatedNode())) { |
| // The node itself is fully selected, not just its contents. Delete it. |
| removeNode(m_downstreamEnd.deprecatedNode()); |
| } else { |
| if (m_downstreamEnd.deprecatedNode()->isTextNode()) { |
| // in a text node that needs to be trimmed |
| Text* text = toText(m_downstreamEnd.deprecatedNode()); |
| if (m_downstreamEnd.deprecatedEditingOffset() > 0) { |
| deleteTextFromNode(text, 0, m_downstreamEnd.deprecatedEditingOffset()); |
| } |
| // Remove children of m_downstreamEnd.deprecatedNode() that come after m_upstreamStart. |
| // Don't try to remove children if m_upstreamStart was inside m_downstreamEnd.deprecatedNode() |
| // and m_upstreamStart has been removed from the document, because then we don't |
| // know how many children to remove. |
| // FIXME: Make m_upstreamStart a position we update as we remove content, then we can |
| // always know which children to remove. |
| } else if (!(startNodeWasDescendantOfEndNode && !m_upstreamStart.inDocument())) { |
| int offset = 0; |
| if (m_upstreamStart.deprecatedNode()->isDescendantOf(m_downstreamEnd.deprecatedNode())) { |
| Node* n = m_upstreamStart.deprecatedNode(); |
| while (n && n->parentNode() != m_downstreamEnd.deprecatedNode()) |
| n = n->parentNode(); |
| if (n) |
| offset = n->nodeIndex() + 1; |
| } |
| removeChildrenInRange(m_downstreamEnd.deprecatedNode(), offset, m_downstreamEnd.deprecatedEditingOffset()); |
| m_downstreamEnd = createLegacyEditingPosition(m_downstreamEnd.deprecatedNode(), offset); |
| } |
| } |
| } |
| } |
| } |
| |
| void DeleteSelectionCommand::fixupWhitespace() |
| { |
| document().updateLayoutIgnorePendingStylesheets(); |
| // FIXME: isRenderedCharacter should be removed, and we should use VisiblePosition::characterAfter and VisiblePosition::characterBefore |
| if (m_leadingWhitespace.isNotNull() && !m_leadingWhitespace.isRenderedCharacter() && m_leadingWhitespace.deprecatedNode()->isTextNode()) { |
| Text* textNode = toText(m_leadingWhitespace.deprecatedNode()); |
| ASSERT(!textNode->renderer() || textNode->renderer()->style()->collapseWhiteSpace()); |
| replaceTextInNodePreservingMarkers(textNode, m_leadingWhitespace.deprecatedEditingOffset(), 1, nonBreakingSpaceString()); |
| } |
| if (m_trailingWhitespace.isNotNull() && !m_trailingWhitespace.isRenderedCharacter() && m_trailingWhitespace.deprecatedNode()->isTextNode()) { |
| Text* textNode = toText(m_trailingWhitespace.deprecatedNode()); |
| ASSERT(!textNode->renderer() ||textNode->renderer()->style()->collapseWhiteSpace()); |
| replaceTextInNodePreservingMarkers(textNode, m_trailingWhitespace.deprecatedEditingOffset(), 1, nonBreakingSpaceString()); |
| } |
| } |
| |
| // If a selection starts in one block and ends in another, we have to merge to bring content before the |
| // start together with content after the end. |
| void DeleteSelectionCommand::mergeParagraphs() |
| { |
| if (!m_mergeBlocksAfterDelete) { |
| if (m_pruneStartBlockIfNecessary) { |
| // We aren't going to merge into the start block, so remove it if it's empty. |
| prune(m_startBlock); |
| // Removing the start block during a deletion is usually an indication that we need |
| // a placeholder, but not in this case. |
| m_needPlaceholder = false; |
| } |
| return; |
| } |
| |
| // It shouldn't have been asked to both try and merge content into the start block and prune it. |
| ASSERT(!m_pruneStartBlockIfNecessary); |
| |
| // FIXME: Deletion should adjust selection endpoints as it removes nodes so that we never get into this state (4099839). |
| if (!m_downstreamEnd.inDocument() || !m_upstreamStart.inDocument()) |
| return; |
| |
| // FIXME: The deletion algorithm shouldn't let this happen. |
| if (comparePositions(m_upstreamStart, m_downstreamEnd) > 0) |
| return; |
| |
| // There's nothing to merge. |
| if (m_upstreamStart == m_downstreamEnd) |
| return; |
| |
| VisiblePosition startOfParagraphToMove(m_downstreamEnd); |
| VisiblePosition mergeDestination(m_upstreamStart); |
| |
| // m_downstreamEnd's block has been emptied out by deletion. There is no content inside of it to |
| // move, so just remove it. |
| Element* endBlock = enclosingBlock(m_downstreamEnd.deprecatedNode()); |
| if (!endBlock || !endBlock->contains(startOfParagraphToMove.deepEquivalent().deprecatedNode()) || !startOfParagraphToMove.deepEquivalent().deprecatedNode()) { |
| removeNode(enclosingBlock(m_downstreamEnd.deprecatedNode())); |
| return; |
| } |
| |
| // We need to merge into m_upstreamStart's block, but it's been emptied out and collapsed by deletion. |
| if (!mergeDestination.deepEquivalent().deprecatedNode() || (!mergeDestination.deepEquivalent().deprecatedNode()->isDescendantOf(enclosingBlock(m_upstreamStart.containerNode())) && (!mergeDestination.deepEquivalent().anchorNode()->firstChild() || !m_upstreamStart.containerNode()->firstChild())) || (m_startsAtEmptyLine && mergeDestination != startOfParagraphToMove)) { |
| insertNodeAt(createBreakElement(document()).get(), m_upstreamStart); |
| mergeDestination = VisiblePosition(m_upstreamStart); |
| } |
| |
| if (mergeDestination == startOfParagraphToMove) |
| return; |
| |
| VisiblePosition endOfParagraphToMove = endOfParagraph(startOfParagraphToMove); |
| |
| if (mergeDestination == endOfParagraphToMove) |
| return; |
| |
| // The rule for merging into an empty block is: only do so if its farther to the right. |
| // FIXME: Consider RTL. |
| if (!m_startsAtEmptyLine && isStartOfParagraph(mergeDestination) && startOfParagraphToMove.absoluteCaretBounds().x() > mergeDestination.absoluteCaretBounds().x()) { |
| if (mergeDestination.deepEquivalent().downstream().deprecatedNode()->hasTagName(brTag)) { |
| removeNodeAndPruneAncestors(mergeDestination.deepEquivalent().downstream().deprecatedNode()); |
| m_endingPosition = startOfParagraphToMove.deepEquivalent(); |
| return; |
| } |
| } |
| |
| // Block images, tables and horizontal rules cannot be made inline with content at mergeDestination. If there is |
| // any (!isStartOfParagraph(mergeDestination)), don't merge, just move the caret to just before the selection we deleted. |
| // See https://bugs.webkit.org/show_bug.cgi?id=25439 |
| if (isRenderedAsNonInlineTableImageOrHR(startOfParagraphToMove.deepEquivalent().deprecatedNode()) && !isStartOfParagraph(mergeDestination)) { |
| m_endingPosition = m_upstreamStart; |
| return; |
| } |
| |
| // moveParagraphs will insert placeholders if it removes blocks that would require their use, don't let block |
| // removals that it does cause the insertion of *another* placeholder. |
| bool needPlaceholder = m_needPlaceholder; |
| bool paragraphToMergeIsEmpty = (startOfParagraphToMove == endOfParagraphToMove); |
| moveParagraph(startOfParagraphToMove, endOfParagraphToMove, mergeDestination, false, !paragraphToMergeIsEmpty); |
| m_needPlaceholder = needPlaceholder; |
| // The endingPosition was likely clobbered by the move, so recompute it (moveParagraph selects the moved paragraph). |
| m_endingPosition = endingSelection().start(); |
| } |
| |
| void DeleteSelectionCommand::removePreviouslySelectedEmptyTableRows() |
| { |
| if (m_endTableRow && m_endTableRow->inDocument() && m_endTableRow != m_startTableRow) { |
| Node* row = m_endTableRow->previousSibling(); |
| while (row && row != m_startTableRow) { |
| RefPtr<Node> previousRow = row->previousSibling(); |
| if (isTableRowEmpty(row)) |
| // Use a raw removeNode, instead of DeleteSelectionCommand's, because |
| // that won't remove rows, it only empties them in preparation for this function. |
| CompositeEditCommand::removeNode(row); |
| row = previousRow.get(); |
| } |
| } |
| |
| // Remove empty rows after the start row. |
| if (m_startTableRow && m_startTableRow->inDocument() && m_startTableRow != m_endTableRow) { |
| Node* row = m_startTableRow->nextSibling(); |
| while (row && row != m_endTableRow) { |
| RefPtr<Node> nextRow = row->nextSibling(); |
| if (isTableRowEmpty(row)) |
| CompositeEditCommand::removeNode(row); |
| row = nextRow.get(); |
| } |
| } |
| |
| if (m_endTableRow && m_endTableRow->inDocument() && m_endTableRow != m_startTableRow) |
| if (isTableRowEmpty(m_endTableRow.get())) { |
| // Don't remove m_endTableRow if it's where we're putting the ending selection. |
| if (!m_endingPosition.deprecatedNode()->isDescendantOf(m_endTableRow.get())) { |
| // FIXME: We probably shouldn't remove m_endTableRow unless it's fully selected, even if it is empty. |
| // We'll need to start adjusting the selection endpoints during deletion to know whether or not m_endTableRow |
| // was fully selected here. |
| CompositeEditCommand::removeNode(m_endTableRow.get()); |
| } |
| } |
| } |
| |
| void DeleteSelectionCommand::calculateTypingStyleAfterDelete() |
| { |
| // Clearing any previously set typing style and doing an early return. |
| if (!m_typingStyle) { |
| document().frame()->selection().clearTypingStyle(); |
| return; |
| } |
| |
| // Compute the difference between the style before the delete and the style now |
| // after the delete has been done. Set this style on the frame, so other editing |
| // commands being composed with this one will work, and also cache it on the command, |
| // so the Frame::appliedEditing can set it after the whole composite command |
| // has completed. |
| |
| // If we deleted into a blockquote, but are now no longer in a blockquote, use the alternate typing style |
| if (m_deleteIntoBlockquoteStyle && !enclosingNodeOfType(m_endingPosition, isMailBlockquote, CanCrossEditingBoundary)) |
| m_typingStyle = m_deleteIntoBlockquoteStyle; |
| m_deleteIntoBlockquoteStyle = 0; |
| |
| m_typingStyle->prepareToApplyAt(m_endingPosition); |
| if (m_typingStyle->isEmpty()) |
| m_typingStyle = 0; |
| // This is where we've deleted all traces of a style but not a whole paragraph (that's handled above). |
| // In this case if we start typing, the new characters should have the same style as the just deleted ones, |
| // but, if we change the selection, come back and start typing that style should be lost. Also see |
| // preserveTypingStyle() below. |
| document().frame()->selection().setTypingStyle(m_typingStyle); |
| } |
| |
| void DeleteSelectionCommand::clearTransientState() |
| { |
| m_selectionToDelete = VisibleSelection(); |
| m_upstreamStart.clear(); |
| m_downstreamStart.clear(); |
| m_upstreamEnd.clear(); |
| m_downstreamEnd.clear(); |
| m_endingPosition.clear(); |
| m_leadingWhitespace.clear(); |
| m_trailingWhitespace.clear(); |
| } |
| |
| // This method removes div elements with no attributes that have only one child or no children at all. |
| void DeleteSelectionCommand::removeRedundantBlocks() |
| { |
| Node* node = m_endingPosition.containerNode(); |
| Node* rootNode = node->rootEditableElement(); |
| |
| while (node != rootNode) { |
| if (isRemovableBlock(node)) { |
| if (node == m_endingPosition.anchorNode()) |
| updatePositionForNodeRemovalPreservingChildren(m_endingPosition, node); |
| |
| CompositeEditCommand::removeNodePreservingChildren(node); |
| node = m_endingPosition.anchorNode(); |
| } else |
| node = node->parentNode(); |
| } |
| } |
| |
| void DeleteSelectionCommand::doApply() |
| { |
| // If selection has not been set to a custom selection when the command was created, |
| // use the current ending selection. |
| if (!m_hasSelectionToDelete) |
| m_selectionToDelete = endingSelection(); |
| |
| if (!m_selectionToDelete.isNonOrphanedRange()) |
| return; |
| |
| // save this to later make the selection with |
| EAffinity affinity = m_selectionToDelete.affinity(); |
| |
| Position downstreamEnd = m_selectionToDelete.end().downstream(); |
| bool rootWillStayOpenWithoutPlaceholder = downstreamEnd.containerNode() == downstreamEnd.containerNode()->rootEditableElement() |
| || (downstreamEnd.containerNode()->isTextNode() && downstreamEnd.containerNode()->parentNode() == downstreamEnd.containerNode()->rootEditableElement()); |
| bool lineBreakAtEndOfSelectionToDelete = lineBreakExistsAtVisiblePosition(m_selectionToDelete.visibleEnd()); |
| m_needPlaceholder = !rootWillStayOpenWithoutPlaceholder |
| && isStartOfParagraph(m_selectionToDelete.visibleStart(), CanCrossEditingBoundary) |
| && isEndOfParagraph(m_selectionToDelete.visibleEnd(), CanCrossEditingBoundary) |
| && !lineBreakAtEndOfSelectionToDelete; |
| if (m_needPlaceholder) { |
| // Don't need a placeholder when deleting a selection that starts just before a table |
| // and ends inside it (we do need placeholders to hold open empty cells, but that's |
| // handled elsewhere). |
| if (Node* table = isLastPositionBeforeTable(m_selectionToDelete.visibleStart())) |
| if (m_selectionToDelete.end().deprecatedNode()->isDescendantOf(table)) |
| m_needPlaceholder = false; |
| } |
| |
| |
| // set up our state |
| initializePositionData(); |
| |
| bool lineBreakBeforeStart = lineBreakExistsAtVisiblePosition(VisiblePosition(m_upstreamStart).previous()); |
| |
| // Delete any text that may hinder our ability to fixup whitespace after the delete |
| deleteInsignificantTextDownstream(m_trailingWhitespace); |
| |
| saveTypingStyleState(); |
| |
| // deleting just a BR is handled specially, at least because we do not |
| // want to replace it with a placeholder BR! |
| if (handleSpecialCaseBRDelete()) { |
| calculateTypingStyleAfterDelete(); |
| setEndingSelection(VisibleSelection(m_endingPosition, affinity, endingSelection().isDirectional())); |
| clearTransientState(); |
| rebalanceWhitespace(); |
| return; |
| } |
| |
| handleGeneralDelete(); |
| |
| fixupWhitespace(); |
| |
| mergeParagraphs(); |
| |
| removePreviouslySelectedEmptyTableRows(); |
| |
| if (!m_needPlaceholder && rootWillStayOpenWithoutPlaceholder) { |
| VisiblePosition visualEnding(m_endingPosition); |
| bool hasPlaceholder = lineBreakExistsAtVisiblePosition(visualEnding) |
| && visualEnding.next(CannotCrossEditingBoundary).isNull(); |
| m_needPlaceholder = hasPlaceholder && lineBreakBeforeStart && !lineBreakAtEndOfSelectionToDelete; |
| } |
| |
| RefPtr<Node> placeholder = m_needPlaceholder ? createBreakElement(document()).get() : 0; |
| |
| if (placeholder) { |
| if (m_sanitizeMarkup) |
| removeRedundantBlocks(); |
| insertNodeAt(placeholder.get(), m_endingPosition); |
| } |
| |
| rebalanceWhitespaceAt(m_endingPosition); |
| |
| calculateTypingStyleAfterDelete(); |
| |
| setEndingSelection(VisibleSelection(m_endingPosition, affinity, endingSelection().isDirectional())); |
| clearTransientState(); |
| } |
| |
| EditAction DeleteSelectionCommand::editingAction() const |
| { |
| // Note that DeleteSelectionCommand is also used when the user presses the Delete key, |
| // but in that case there's a TypingCommand that supplies the editingAction(), so |
| // the Undo menu correctly shows "Undo Typing" |
| return EditActionCut; |
| } |
| |
| // Normally deletion doesn't preserve the typing style that was present before it. For example, |
| // type a character, Bold, then delete the character and start typing. The Bold typing style shouldn't |
| // stick around. Deletion should preserve a typing style that *it* sets, however. |
| bool DeleteSelectionCommand::preservesTypingStyle() const |
| { |
| return m_typingStyle; |
| } |
| |
| } // namespace WebCore |
