2 * Copyright (C) 2005 Apple Computer, Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
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11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
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15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 #include "DeleteSelectionCommand.h"
30 #include "DocumentFragment.h"
31 #include "DocumentMarkerController.h"
32 #include "EditingBoundary.h"
34 #include "EditorClient.h"
37 #include "htmlediting.h"
38 #include "HTMLInputElement.h"
39 #include "HTMLNames.h"
40 #include "RenderTableCell.h"
42 #include "visible_units.h"
46 using namespace HTMLNames;
48 static bool isTableRow(const Node* node)
50 return node && node->hasTagName(trTag);
53 static bool isTableCellEmpty(Node* cell)
55 ASSERT(isTableCell(cell));
56 return VisiblePosition(firstPositionInNode(cell)) == VisiblePosition(lastPositionInNode(cell));
59 static bool isTableRowEmpty(Node* row)
64 for (Node* child = row->firstChild(); child; child = child->nextSibling())
65 if (isTableCell(child) && !isTableCellEmpty(child))
71 DeleteSelectionCommand::DeleteSelectionCommand(Document *document, bool smartDelete, bool mergeBlocksAfterDelete, bool replace, bool expandForSpecialElements, bool sanitizeMarkup)
72 : CompositeEditCommand(document)
73 , m_hasSelectionToDelete(false)
74 , m_smartDelete(smartDelete)
75 , m_mergeBlocksAfterDelete(mergeBlocksAfterDelete)
76 , m_needPlaceholder(false)
78 , m_expandForSpecialElements(expandForSpecialElements)
79 , m_pruneStartBlockIfNecessary(false)
80 , m_startsAtEmptyLine(false)
81 , m_sanitizeMarkup(sanitizeMarkup)
85 , m_deleteIntoBlockquoteStyle(0)
89 DeleteSelectionCommand::DeleteSelectionCommand(const VisibleSelection& selection, bool smartDelete, bool mergeBlocksAfterDelete, bool replace, bool expandForSpecialElements, bool sanitizeMarkup)
90 : CompositeEditCommand(selection.start().anchorNode()->document())
91 , m_hasSelectionToDelete(true)
92 , m_smartDelete(smartDelete)
93 , m_mergeBlocksAfterDelete(mergeBlocksAfterDelete)
94 , m_needPlaceholder(false)
96 , m_expandForSpecialElements(expandForSpecialElements)
97 , m_pruneStartBlockIfNecessary(false)
98 , m_startsAtEmptyLine(false)
99 , m_sanitizeMarkup(sanitizeMarkup)
100 , m_selectionToDelete(selection)
104 , m_deleteIntoBlockquoteStyle(0)
108 void DeleteSelectionCommand::initializeStartEnd(Position& start, Position& end)
110 Node* startSpecialContainer = 0;
111 Node* endSpecialContainer = 0;
113 start = m_selectionToDelete.start();
114 end = m_selectionToDelete.end();
116 // 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,
117 // but in these cases, we want to delete it, so manually expand the selection
118 if (start.deprecatedNode()->hasTagName(hrTag))
119 start = positionBeforeNode(start.deprecatedNode());
120 else if (end.deprecatedNode()->hasTagName(hrTag))
121 end = positionAfterNode(end.deprecatedNode());
123 // FIXME: This is only used so that moveParagraphs can avoid the bugs in special element expansion.
124 if (!m_expandForSpecialElements)
128 startSpecialContainer = 0;
129 endSpecialContainer = 0;
131 Position s = positionBeforeContainingSpecialElement(start, &startSpecialContainer);
132 Position e = positionAfterContainingSpecialElement(end, &endSpecialContainer);
134 if (!startSpecialContainer && !endSpecialContainer)
137 if (VisiblePosition(start) != m_selectionToDelete.visibleStart() || VisiblePosition(end) != m_selectionToDelete.visibleEnd())
140 // If we're going to expand to include the startSpecialContainer, it must be fully selected.
141 if (startSpecialContainer && !endSpecialContainer && comparePositions(positionInParentAfterNode(startSpecialContainer), end) > -1)
144 // If we're going to expand to include the endSpecialContainer, it must be fully selected.
145 if (endSpecialContainer && !startSpecialContainer && comparePositions(start, positionInParentBeforeNode(endSpecialContainer)) > -1)
148 if (startSpecialContainer && startSpecialContainer->isDescendantOf(endSpecialContainer))
149 // Don't adjust the end yet, it is the end of a special element that contains the start
150 // special element (which may or may not be fully selected).
152 else if (endSpecialContainer && endSpecialContainer->isDescendantOf(startSpecialContainer))
153 // Don't adjust the start yet, it is the start of a special element that contains the end
154 // special element (which may or may not be fully selected).
163 void DeleteSelectionCommand::setStartingSelectionOnSmartDelete(const Position& start, const Position& end)
165 VisiblePosition newBase;
166 VisiblePosition newExtent;
167 if (startingSelection().isBaseFirst()) {
174 setStartingSelection(VisibleSelection(newBase, newExtent, startingSelection().isDirectional()));
177 void DeleteSelectionCommand::initializePositionData()
180 initializeStartEnd(start, end);
182 m_upstreamStart = start.upstream();
183 m_downstreamStart = start.downstream();
184 m_upstreamEnd = end.upstream();
185 m_downstreamEnd = end.downstream();
187 m_startRoot = editableRootForPosition(start);
188 m_endRoot = editableRootForPosition(end);
190 m_startTableRow = enclosingNodeOfType(start, &isTableRow);
191 m_endTableRow = enclosingNodeOfType(end, &isTableRow);
193 // Don't move content out of a table cell.
194 // If the cell is non-editable, enclosingNodeOfType won't return it by default, so
195 // tell that function that we don't care if it returns non-editable nodes.
196 Node* startCell = enclosingNodeOfType(m_upstreamStart, &isTableCell, CanCrossEditingBoundary);
197 Node* endCell = enclosingNodeOfType(m_downstreamEnd, &isTableCell, CanCrossEditingBoundary);
198 // FIXME: This isn't right. A borderless table with two rows and a single column would appear as two paragraphs.
199 if (endCell && endCell != startCell)
200 m_mergeBlocksAfterDelete = false;
202 // Usually the start and the end of the selection to delete are pulled together as a result of the deletion.
203 // Sometimes they aren't (like when no merge is requested), so we must choose one position to hold the caret
204 // and receive the placeholder after deletion.
205 VisiblePosition visibleEnd(m_downstreamEnd);
206 if (m_mergeBlocksAfterDelete && !isEndOfParagraph(visibleEnd))
207 m_endingPosition = m_downstreamEnd;
209 m_endingPosition = m_downstreamStart;
211 // We don't want to merge into a block if it will mean changing the quote level of content after deleting
212 // selections that contain a whole number paragraphs plus a line break, since it is unclear to most users
213 // that such a selection actually ends at the start of the next paragraph. This matches TextEdit behavior
214 // for indented paragraphs.
215 // Only apply this rule if the endingSelection is a range selection. If it is a caret, then other operations have created
216 // 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.
217 if (numEnclosingMailBlockquotes(start) != numEnclosingMailBlockquotes(end)
218 && isStartOfParagraph(visibleEnd) && isStartOfParagraph(VisiblePosition(start))
219 && endingSelection().isRange()) {
220 m_mergeBlocksAfterDelete = false;
221 m_pruneStartBlockIfNecessary = true;
224 // Handle leading and trailing whitespace, as well as smart delete adjustments to the selection
225 m_leadingWhitespace = m_upstreamStart.leadingWhitespacePosition(m_selectionToDelete.affinity());
226 m_trailingWhitespace = m_downstreamEnd.trailingWhitespacePosition(VP_DEFAULT_AFFINITY);
230 // skip smart delete if the selection to delete already starts or ends with whitespace
231 Position pos = VisiblePosition(m_upstreamStart, m_selectionToDelete.affinity()).deepEquivalent();
232 bool skipSmartDelete = pos.trailingWhitespacePosition(VP_DEFAULT_AFFINITY, true).isNotNull();
233 if (!skipSmartDelete)
234 skipSmartDelete = m_downstreamEnd.leadingWhitespacePosition(VP_DEFAULT_AFFINITY, true).isNotNull();
236 // extend selection upstream if there is whitespace there
237 bool hasLeadingWhitespaceBeforeAdjustment = m_upstreamStart.leadingWhitespacePosition(m_selectionToDelete.affinity(), true).isNotNull();
238 if (!skipSmartDelete && hasLeadingWhitespaceBeforeAdjustment) {
239 VisiblePosition visiblePos = VisiblePosition(m_upstreamStart, VP_DEFAULT_AFFINITY).previous();
240 pos = visiblePos.deepEquivalent();
241 // Expand out one character upstream for smart delete and recalculate
242 // positions based on this change.
243 m_upstreamStart = pos.upstream();
244 m_downstreamStart = pos.downstream();
245 m_leadingWhitespace = m_upstreamStart.leadingWhitespacePosition(visiblePos.affinity());
247 setStartingSelectionOnSmartDelete(m_upstreamStart, m_upstreamEnd);
250 // trailing whitespace is only considered for smart delete if there is no leading
251 // whitespace, as in the case where you double-click the first word of a paragraph.
252 if (!skipSmartDelete && !hasLeadingWhitespaceBeforeAdjustment && m_downstreamEnd.trailingWhitespacePosition(VP_DEFAULT_AFFINITY, true).isNotNull()) {
253 // Expand out one character downstream for smart delete and recalculate
254 // positions based on this change.
255 pos = VisiblePosition(m_downstreamEnd, VP_DEFAULT_AFFINITY).next().deepEquivalent();
256 m_upstreamEnd = pos.upstream();
257 m_downstreamEnd = pos.downstream();
258 m_trailingWhitespace = m_downstreamEnd.trailingWhitespacePosition(VP_DEFAULT_AFFINITY);
260 setStartingSelectionOnSmartDelete(m_downstreamStart, m_downstreamEnd);
264 // We must pass call parentAnchoredEquivalent on the positions since some editing positions
265 // that appear inside their nodes aren't really inside them. [hr, 0] is one example.
266 // FIXME: parentAnchoredEquivalent should eventually be moved into enclosing element getters
267 // like the one below, since editing functions should obviously accept editing positions.
268 // FIXME: Passing false to enclosingNodeOfType tells it that it's OK to return a non-editable
269 // node. This was done to match existing behavior, but it seems wrong.
270 m_startBlock = enclosingNodeOfType(m_downstreamStart.parentAnchoredEquivalent(), &isBlock, CanCrossEditingBoundary);
271 m_endBlock = enclosingNodeOfType(m_upstreamEnd.parentAnchoredEquivalent(), &isBlock, CanCrossEditingBoundary);
274 void DeleteSelectionCommand::saveTypingStyleState()
276 // A common case is deleting characters that are all from the same text node. In
277 // that case, the style at the start of the selection before deletion will be the
278 // same as the style at the start of the selection after deletion (since those
279 // two positions will be identical). Therefore there is no need to save the
280 // typing style at the start of the selection, nor is there a reason to
281 // compute the style at the start of the selection after deletion (see the
282 // early return in calculateTypingStyleAfterDelete).
283 if (m_upstreamStart.deprecatedNode() == m_downstreamEnd.deprecatedNode() && m_upstreamStart.deprecatedNode()->isTextNode())
286 // Figure out the typing style in effect before the delete is done.
287 m_typingStyle = EditingStyle::create(m_selectionToDelete.start());
288 m_typingStyle->removeStyleAddedByNode(enclosingAnchorElement(m_selectionToDelete.start()));
290 // If we're deleting into a Mail blockquote, save the style at end() instead of start()
291 // We'll use this later in computeTypingStyleAfterDelete if we end up outside of a Mail blockquote
292 if (enclosingNodeOfType(m_selectionToDelete.start(), isMailBlockquote))
293 m_deleteIntoBlockquoteStyle = EditingStyle::create(m_selectionToDelete.end());
295 m_deleteIntoBlockquoteStyle = 0;
298 bool DeleteSelectionCommand::handleSpecialCaseBRDelete()
300 Node* nodeAfterUpstreamStart = m_upstreamStart.computeNodeAfterPosition();
301 Node* nodeAfterDownstreamStart = m_downstreamStart.computeNodeAfterPosition();
302 // Upstream end will appear before BR due to canonicalization
303 Node* nodeAfterUpstreamEnd = m_upstreamEnd.computeNodeAfterPosition();
305 if (!nodeAfterUpstreamStart || !nodeAfterDownstreamStart)
308 // Check for special-case where the selection contains only a BR on a line by itself after another BR.
309 bool upstreamStartIsBR = nodeAfterUpstreamStart->hasTagName(brTag);
310 bool downstreamStartIsBR = nodeAfterDownstreamStart->hasTagName(brTag);
311 bool isBROnLineByItself = upstreamStartIsBR && downstreamStartIsBR && nodeAfterDownstreamStart == nodeAfterUpstreamEnd;
312 if (isBROnLineByItself) {
313 removeNode(nodeAfterDownstreamStart);
317 // FIXME: This code doesn't belong in here.
318 // We detect the case where the start is an empty line consisting of BR not wrapped in a block element.
319 if (upstreamStartIsBR && downstreamStartIsBR && !(isStartOfBlock(positionBeforeNode(nodeAfterUpstreamStart)) && isEndOfBlock(positionAfterNode(nodeAfterUpstreamStart)))) {
320 m_startsAtEmptyLine = true;
321 m_endingPosition = m_downstreamEnd;
327 static Position firstEditablePositionInNode(Node* node)
331 while (next && !next->rendererIsEditable())
332 next = next->traverseNextNode(node);
333 return next ? firstPositionInOrBeforeNode(next) : Position();
336 void DeleteSelectionCommand::removeNode(PassRefPtr<Node> node)
341 if (m_startRoot != m_endRoot && !(node->isDescendantOf(m_startRoot.get()) && node->isDescendantOf(m_endRoot.get()))) {
342 // If a node is not in both the start and end editable roots, remove it only if its inside an editable region.
343 if (!node->parentNode()->rendererIsEditable()) {
344 // Don't remove non-editable atomic nodes.
345 if (!node->firstChild())
347 // Search this non-editable region for editable regions to empty.
348 RefPtr<Node> child = node->firstChild();
350 RefPtr<Node> nextChild = child->nextSibling();
351 removeNode(child.get());
352 // Bail if nextChild is no longer node's child.
353 if (nextChild && nextChild->parentNode() != node)
358 // Don't remove editable regions that are inside non-editable ones, just clear them.
363 if (isTableStructureNode(node.get()) || node->isRootEditableElement()) {
364 // Do not remove an element of table structure; remove its contents.
365 // Likewise for the root editable element.
366 Node* child = node->firstChild();
368 Node* remove = child;
369 child = child->nextSibling();
373 // Make sure empty cell has some height, if a placeholder can be inserted.
374 document()->updateLayoutIgnorePendingStylesheets();
375 RenderObject *r = node->renderer();
376 if (r && r->isTableCell() && toRenderTableCell(r)->contentHeight() <= 0) {
377 Position firstEditablePosition = firstEditablePositionInNode(node.get());
378 if (firstEditablePosition.isNotNull())
379 insertBlockPlaceholder(firstEditablePosition);
384 if (node == m_startBlock && !isEndOfBlock(VisiblePosition(firstPositionInNode(m_startBlock.get())).previous()))
385 m_needPlaceholder = true;
386 else if (node == m_endBlock && !isStartOfBlock(VisiblePosition(lastPositionInNode(m_startBlock.get())).next()))
387 m_needPlaceholder = true;
389 // FIXME: Update the endpoints of the range being deleted.
390 updatePositionForNodeRemoval(m_endingPosition, node.get());
391 updatePositionForNodeRemoval(m_leadingWhitespace, node.get());
392 updatePositionForNodeRemoval(m_trailingWhitespace, node.get());
394 CompositeEditCommand::removeNode(node);
397 static void updatePositionForTextRemoval(Node* node, int offset, int count, Position& position)
399 if (position.anchorType() != Position::PositionIsOffsetInAnchor || position.containerNode() != node)
402 if (position.offsetInContainerNode() > offset + count)
403 position.moveToOffset(position.offsetInContainerNode() - count);
404 else if (position.offsetInContainerNode() > offset)
405 position.moveToOffset(offset);
408 void DeleteSelectionCommand::deleteTextFromNode(PassRefPtr<Text> node, unsigned offset, unsigned count)
410 // FIXME: Update the endpoints of the range being deleted.
411 updatePositionForTextRemoval(node.get(), offset, count, m_endingPosition);
412 updatePositionForTextRemoval(node.get(), offset, count, m_leadingWhitespace);
413 updatePositionForTextRemoval(node.get(), offset, count, m_trailingWhitespace);
414 updatePositionForTextRemoval(node.get(), offset, count, m_downstreamEnd);
416 CompositeEditCommand::deleteTextFromNode(node, offset, count);
419 void DeleteSelectionCommand::handleGeneralDelete()
421 if (m_upstreamStart.isNull())
424 int startOffset = m_upstreamStart.deprecatedEditingOffset();
425 Node* startNode = m_upstreamStart.deprecatedNode();
427 // Never remove the start block unless it's a table, in which case we won't merge content in.
428 if (startNode == m_startBlock && startOffset == 0 && canHaveChildrenForEditing(startNode) && !startNode->hasTagName(tableTag)) {
430 startNode = startNode->traverseNextNode();
435 if (startOffset >= caretMaxOffset(startNode) && startNode->isTextNode()) {
436 Text* text = toText(startNode);
437 if (text->length() > (unsigned)caretMaxOffset(startNode))
438 deleteTextFromNode(text, caretMaxOffset(startNode), text->length() - caretMaxOffset(startNode));
441 if (startOffset >= lastOffsetForEditing(startNode)) {
442 startNode = startNode->traverseNextSibling();
446 // Done adjusting the start. See if we're all done.
450 if (startNode == m_downstreamEnd.deprecatedNode()) {
451 if (m_downstreamEnd.deprecatedEditingOffset() - startOffset > 0) {
452 if (startNode->isTextNode()) {
453 // in a text node that needs to be trimmed
454 Text* text = toText(startNode);
455 deleteTextFromNode(text, startOffset, m_downstreamEnd.deprecatedEditingOffset() - startOffset);
457 removeChildrenInRange(startNode, startOffset, m_downstreamEnd.deprecatedEditingOffset());
458 m_endingPosition = m_upstreamStart;
462 // The selection to delete is all in one node.
463 if (!startNode->renderer() || (!startOffset && m_downstreamEnd.atLastEditingPositionForNode()))
464 removeNode(startNode);
467 bool startNodeWasDescendantOfEndNode = m_upstreamStart.deprecatedNode()->isDescendantOf(m_downstreamEnd.deprecatedNode());
468 // The selection to delete spans more than one node.
469 RefPtr<Node> node(startNode);
471 if (startOffset > 0) {
472 if (startNode->isTextNode()) {
473 // in a text node that needs to be trimmed
474 Text* text = toText(node.get());
475 deleteTextFromNode(text, startOffset, text->length() - startOffset);
476 node = node->traverseNextNode();
478 node = startNode->childNode(startOffset);
480 } else if (startNode == m_upstreamEnd.deprecatedNode() && startNode->isTextNode()) {
481 Text* text = toText(m_upstreamEnd.deprecatedNode());
482 deleteTextFromNode(text, 0, m_upstreamEnd.deprecatedEditingOffset());
485 // handle deleting all nodes that are completely selected
486 while (node && node != m_downstreamEnd.deprecatedNode()) {
487 if (comparePositions(firstPositionInOrBeforeNode(node.get()), m_downstreamEnd) >= 0) {
488 // traverseNextSibling just blew past the end position, so stop deleting
490 } else if (!m_downstreamEnd.deprecatedNode()->isDescendantOf(node.get())) {
491 RefPtr<Node> nextNode = node->traverseNextSibling();
492 // if we just removed a node from the end container, update end position so the
493 // check above will work
494 updatePositionForNodeRemoval(m_downstreamEnd, node.get());
495 removeNode(node.get());
496 node = nextNode.get();
498 Node* n = node->lastDescendant();
499 if (m_downstreamEnd.deprecatedNode() == n && m_downstreamEnd.deprecatedEditingOffset() >= caretMaxOffset(n)) {
500 removeNode(node.get());
503 node = node->traverseNextNode();
507 if (m_downstreamEnd.deprecatedNode() != startNode && !m_upstreamStart.deprecatedNode()->isDescendantOf(m_downstreamEnd.deprecatedNode()) && m_downstreamEnd.anchorNode()->inDocument() && m_downstreamEnd.deprecatedEditingOffset() >= caretMinOffset(m_downstreamEnd.deprecatedNode())) {
508 if (m_downstreamEnd.atLastEditingPositionForNode() && !canHaveChildrenForEditing(m_downstreamEnd.deprecatedNode())) {
509 // The node itself is fully selected, not just its contents. Delete it.
510 removeNode(m_downstreamEnd.deprecatedNode());
512 if (m_downstreamEnd.deprecatedNode()->isTextNode()) {
513 // in a text node that needs to be trimmed
514 Text* text = toText(m_downstreamEnd.deprecatedNode());
515 if (m_downstreamEnd.deprecatedEditingOffset() > 0) {
516 deleteTextFromNode(text, 0, m_downstreamEnd.deprecatedEditingOffset());
518 // Remove children of m_downstreamEnd.deprecatedNode() that come after m_upstreamStart.
519 // Don't try to remove children if m_upstreamStart was inside m_downstreamEnd.deprecatedNode()
520 // and m_upstreamStart has been removed from the document, because then we don't
521 // know how many children to remove.
522 // FIXME: Make m_upstreamStart a position we update as we remove content, then we can
523 // always know which children to remove.
524 } else if (!(startNodeWasDescendantOfEndNode && !m_upstreamStart.anchorNode()->inDocument())) {
526 if (m_upstreamStart.deprecatedNode()->isDescendantOf(m_downstreamEnd.deprecatedNode())) {
527 Node* n = m_upstreamStart.deprecatedNode();
528 while (n && n->parentNode() != m_downstreamEnd.deprecatedNode())
531 offset = n->nodeIndex() + 1;
533 removeChildrenInRange(m_downstreamEnd.deprecatedNode(), offset, m_downstreamEnd.deprecatedEditingOffset());
534 m_downstreamEnd = createLegacyEditingPosition(m_downstreamEnd.deprecatedNode(), offset);
541 void DeleteSelectionCommand::fixupWhitespace()
543 document()->updateLayoutIgnorePendingStylesheets();
544 // FIXME: isRenderedCharacter should be removed, and we should use VisiblePosition::characterAfter and VisiblePosition::characterBefore
545 if (m_leadingWhitespace.isNotNull() && !m_leadingWhitespace.isRenderedCharacter() && m_leadingWhitespace.deprecatedNode()->isTextNode()) {
546 Text* textNode = toText(m_leadingWhitespace.deprecatedNode());
547 ASSERT(!textNode->renderer() || textNode->renderer()->style()->collapseWhiteSpace());
548 replaceTextInNodePreservingMarkers(textNode, m_leadingWhitespace.deprecatedEditingOffset(), 1, nonBreakingSpaceString());
550 if (m_trailingWhitespace.isNotNull() && !m_trailingWhitespace.isRenderedCharacter() && m_trailingWhitespace.deprecatedNode()->isTextNode()) {
551 Text* textNode = toText(m_trailingWhitespace.deprecatedNode());
552 ASSERT(!textNode->renderer() ||textNode->renderer()->style()->collapseWhiteSpace());
553 replaceTextInNodePreservingMarkers(textNode, m_trailingWhitespace.deprecatedEditingOffset(), 1, nonBreakingSpaceString());
557 // If a selection starts in one block and ends in another, we have to merge to bring content before the
558 // start together with content after the end.
559 void DeleteSelectionCommand::mergeParagraphs()
561 if (!m_mergeBlocksAfterDelete) {
562 if (m_pruneStartBlockIfNecessary) {
563 // We aren't going to merge into the start block, so remove it if it's empty.
565 // Removing the start block during a deletion is usually an indication that we need
566 // a placeholder, but not in this case.
567 m_needPlaceholder = false;
572 // It shouldn't have been asked to both try and merge content into the start block and prune it.
573 ASSERT(!m_pruneStartBlockIfNecessary);
575 // FIXME: Deletion should adjust selection endpoints as it removes nodes so that we never get into this state (4099839).
576 if (!m_downstreamEnd.anchorNode()->inDocument() || !m_upstreamStart.anchorNode()->inDocument())
579 // FIXME: The deletion algorithm shouldn't let this happen.
580 if (comparePositions(m_upstreamStart, m_downstreamEnd) > 0)
583 // There's nothing to merge.
584 if (m_upstreamStart == m_downstreamEnd)
587 VisiblePosition startOfParagraphToMove(m_downstreamEnd);
588 VisiblePosition mergeDestination(m_upstreamStart);
590 // m_downstreamEnd's block has been emptied out by deletion. There is no content inside of it to
591 // move, so just remove it.
592 Element* endBlock = enclosingBlock(m_downstreamEnd.deprecatedNode());
593 if (!endBlock || !endBlock->contains(startOfParagraphToMove.deepEquivalent().deprecatedNode()) || !startOfParagraphToMove.deepEquivalent().deprecatedNode()) {
594 removeNode(enclosingBlock(m_downstreamEnd.deprecatedNode()));
598 // We need to merge into m_upstreamStart's block, but it's been emptied out and collapsed by deletion.
599 if (!mergeDestination.deepEquivalent().deprecatedNode() || !mergeDestination.deepEquivalent().deprecatedNode()->isDescendantOf(enclosingBlock(m_upstreamStart.containerNode())) || m_startsAtEmptyLine) {
600 insertNodeAt(createBreakElement(document()).get(), m_upstreamStart);
601 mergeDestination = VisiblePosition(m_upstreamStart);
604 if (mergeDestination == startOfParagraphToMove)
607 VisiblePosition endOfParagraphToMove = endOfParagraph(startOfParagraphToMove);
609 if (mergeDestination == endOfParagraphToMove)
612 // The rule for merging into an empty block is: only do so if its farther to the right.
613 // FIXME: Consider RTL.
614 if (!m_startsAtEmptyLine && isStartOfParagraph(mergeDestination) && startOfParagraphToMove.absoluteCaretBounds().x() > mergeDestination.absoluteCaretBounds().x()) {
615 if (mergeDestination.deepEquivalent().downstream().deprecatedNode()->hasTagName(brTag)) {
616 removeNodeAndPruneAncestors(mergeDestination.deepEquivalent().downstream().deprecatedNode());
617 m_endingPosition = startOfParagraphToMove.deepEquivalent();
622 // Block images, tables and horizontal rules cannot be made inline with content at mergeDestination. If there is
623 // any (!isStartOfParagraph(mergeDestination)), don't merge, just move the caret to just before the selection we deleted.
624 // See https://bugs.webkit.org/show_bug.cgi?id=25439
625 if (isRenderedAsNonInlineTableImageOrHR(startOfParagraphToMove.deepEquivalent().deprecatedNode()) && !isStartOfParagraph(mergeDestination)) {
626 m_endingPosition = m_upstreamStart;
630 RefPtr<Range> range = Range::create(document(), startOfParagraphToMove.deepEquivalent().parentAnchoredEquivalent(), endOfParagraphToMove.deepEquivalent().parentAnchoredEquivalent());
631 RefPtr<Range> rangeToBeReplaced = Range::create(document(), mergeDestination.deepEquivalent().parentAnchoredEquivalent(), mergeDestination.deepEquivalent().parentAnchoredEquivalent());
632 if (!document()->frame()->editor()->client()->shouldMoveRangeAfterDelete(range.get(), rangeToBeReplaced.get()))
635 // moveParagraphs will insert placeholders if it removes blocks that would require their use, don't let block
636 // removals that it does cause the insertion of *another* placeholder.
637 bool needPlaceholder = m_needPlaceholder;
638 bool paragraphToMergeIsEmpty = (startOfParagraphToMove == endOfParagraphToMove);
639 moveParagraph(startOfParagraphToMove, endOfParagraphToMove, mergeDestination, false, !paragraphToMergeIsEmpty);
640 m_needPlaceholder = needPlaceholder;
641 // The endingPosition was likely clobbered by the move, so recompute it (moveParagraph selects the moved paragraph).
642 m_endingPosition = endingSelection().start();
645 void DeleteSelectionCommand::removePreviouslySelectedEmptyTableRows()
647 if (m_endTableRow && m_endTableRow->inDocument() && m_endTableRow != m_startTableRow) {
648 Node* row = m_endTableRow->previousSibling();
649 while (row && row != m_startTableRow) {
650 RefPtr<Node> previousRow = row->previousSibling();
651 if (isTableRowEmpty(row))
652 // Use a raw removeNode, instead of DeleteSelectionCommand's, because
653 // that won't remove rows, it only empties them in preparation for this function.
654 CompositeEditCommand::removeNode(row);
655 row = previousRow.get();
659 // Remove empty rows after the start row.
660 if (m_startTableRow && m_startTableRow->inDocument() && m_startTableRow != m_endTableRow) {
661 Node* row = m_startTableRow->nextSibling();
662 while (row && row != m_endTableRow) {
663 RefPtr<Node> nextRow = row->nextSibling();
664 if (isTableRowEmpty(row))
665 CompositeEditCommand::removeNode(row);
670 if (m_endTableRow && m_endTableRow->inDocument() && m_endTableRow != m_startTableRow)
671 if (isTableRowEmpty(m_endTableRow.get())) {
672 // Don't remove m_endTableRow if it's where we're putting the ending selection.
673 if (!m_endingPosition.deprecatedNode()->isDescendantOf(m_endTableRow.get())) {
674 // FIXME: We probably shouldn't remove m_endTableRow unless it's fully selected, even if it is empty.
675 // We'll need to start adjusting the selection endpoints during deletion to know whether or not m_endTableRow
676 // was fully selected here.
677 CompositeEditCommand::removeNode(m_endTableRow.get());
682 void DeleteSelectionCommand::calculateTypingStyleAfterDelete()
687 // Compute the difference between the style before the delete and the style now
688 // after the delete has been done. Set this style on the frame, so other editing
689 // commands being composed with this one will work, and also cache it on the command,
690 // so the Frame::appliedEditing can set it after the whole composite command
693 // If we deleted into a blockquote, but are now no longer in a blockquote, use the alternate typing style
694 if (m_deleteIntoBlockquoteStyle && !enclosingNodeOfType(m_endingPosition, isMailBlockquote, CanCrossEditingBoundary))
695 m_typingStyle = m_deleteIntoBlockquoteStyle;
696 m_deleteIntoBlockquoteStyle = 0;
698 m_typingStyle->prepareToApplyAt(m_endingPosition);
699 if (m_typingStyle->isEmpty())
701 // This is where we've deleted all traces of a style but not a whole paragraph (that's handled above).
702 // In this case if we start typing, the new characters should have the same style as the just deleted ones,
703 // but, if we change the selection, come back and start typing that style should be lost. Also see
704 // preserveTypingStyle() below.
705 document()->frame()->selection()->setTypingStyle(m_typingStyle);
708 void DeleteSelectionCommand::clearTransientState()
710 m_selectionToDelete = VisibleSelection();
711 m_upstreamStart.clear();
712 m_downstreamStart.clear();
713 m_upstreamEnd.clear();
714 m_downstreamEnd.clear();
715 m_endingPosition.clear();
716 m_leadingWhitespace.clear();
717 m_trailingWhitespace.clear();
720 String DeleteSelectionCommand::originalStringForAutocorrectionAtBeginningOfSelection()
722 if (!m_selectionToDelete.isRange())
725 VisiblePosition startOfSelection = m_selectionToDelete.start();
726 if (!isStartOfWord(startOfSelection))
729 VisiblePosition nextPosition = startOfSelection.next();
730 if (nextPosition.isNull())
733 RefPtr<Range> rangeOfFirstCharacter = Range::create(document(), startOfSelection.deepEquivalent(), nextPosition.deepEquivalent());
734 Vector<DocumentMarker*> markers = document()->markers()->markersInRange(rangeOfFirstCharacter.get(), DocumentMarker::Autocorrected);
735 for (size_t i = 0; i < markers.size(); ++i) {
736 const DocumentMarker* marker = markers[i];
737 int startOffset = marker->startOffset();
738 if (startOffset == startOfSelection.deepEquivalent().offsetInContainerNode())
739 return marker->description();
744 // This method removes div elements with no attributes that have only one child or no children at all.
745 void DeleteSelectionCommand::removeRedundantBlocks()
747 Node* node = m_endingPosition.containerNode();
748 Node* rootNode = node->rootEditableElement();
750 while (node != rootNode) {
751 if (isRemovableBlock(node)) {
752 if (node == m_endingPosition.anchorNode())
753 updatePositionForNodeRemovalPreservingChildren(m_endingPosition, node);
755 CompositeEditCommand::removeNodePreservingChildren(node);
756 node = m_endingPosition.anchorNode();
758 node = node->parentNode();
762 void DeleteSelectionCommand::doApply()
764 // If selection has not been set to a custom selection when the command was created,
765 // use the current ending selection.
766 if (!m_hasSelectionToDelete)
767 m_selectionToDelete = endingSelection();
769 if (!m_selectionToDelete.isNonOrphanedRange())
772 String originalString = originalStringForAutocorrectionAtBeginningOfSelection();
774 // If the deletion is occurring in a text field, and we're not deleting to replace the selection, then let the frame call across the bridge to notify the form delegate.
776 Element* textControl = enclosingTextFormControl(m_selectionToDelete.start());
777 if (textControl && textControl->focused())
778 document()->frame()->editor()->textWillBeDeletedInTextField(textControl);
781 // save this to later make the selection with
782 EAffinity affinity = m_selectionToDelete.affinity();
784 Position downstreamEnd = m_selectionToDelete.end().downstream();
785 m_needPlaceholder = isStartOfParagraph(m_selectionToDelete.visibleStart(), CanCrossEditingBoundary)
786 && isEndOfParagraph(m_selectionToDelete.visibleEnd(), CanCrossEditingBoundary)
787 && !lineBreakExistsAtVisiblePosition(m_selectionToDelete.visibleEnd());
788 if (m_needPlaceholder) {
789 // Don't need a placeholder when deleting a selection that starts just before a table
790 // and ends inside it (we do need placeholders to hold open empty cells, but that's
791 // handled elsewhere).
792 if (Node* table = isLastPositionBeforeTable(m_selectionToDelete.visibleStart()))
793 if (m_selectionToDelete.end().deprecatedNode()->isDescendantOf(table))
794 m_needPlaceholder = false;
799 initializePositionData();
801 // Delete any text that may hinder our ability to fixup whitespace after the delete
802 deleteInsignificantTextDownstream(m_trailingWhitespace);
804 saveTypingStyleState();
806 // deleting just a BR is handled specially, at least because we do not
807 // want to replace it with a placeholder BR!
808 if (handleSpecialCaseBRDelete()) {
809 calculateTypingStyleAfterDelete();
810 setEndingSelection(VisibleSelection(m_endingPosition, affinity, endingSelection().isDirectional()));
811 clearTransientState();
812 rebalanceWhitespace();
816 handleGeneralDelete();
822 removePreviouslySelectedEmptyTableRows();
824 RefPtr<Node> placeholder = m_needPlaceholder ? createBreakElement(document()).get() : 0;
827 if (m_sanitizeMarkup)
828 removeRedundantBlocks();
829 insertNodeAt(placeholder.get(), m_endingPosition);
832 rebalanceWhitespaceAt(m_endingPosition);
834 calculateTypingStyleAfterDelete();
836 if (!originalString.isEmpty()) {
837 if (Frame* frame = document()->frame())
838 frame->editor()->deletedAutocorrectionAtPosition(m_endingPosition, originalString);
841 setEndingSelection(VisibleSelection(m_endingPosition, affinity, endingSelection().isDirectional()));
842 clearTransientState();
845 EditAction DeleteSelectionCommand::editingAction() const
847 // Note that DeleteSelectionCommand is also used when the user presses the Delete key,
848 // but in that case there's a TypingCommand that supplies the editingAction(), so
849 // the Undo menu correctly shows "Undo Typing"
850 return EditActionCut;
853 // Normally deletion doesn't preserve the typing style that was present before it. For example,
854 // type a character, Bold, then delete the character and start typing. The Bold typing style shouldn't
855 // stick around. Deletion should preserve a typing style that *it* sets, however.
856 bool DeleteSelectionCommand::preservesTypingStyle() const
858 return m_typingStyle;
861 } // namespace WebCore