--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/editing/DeleteSelectionCommand.cpp Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,823 @@
+/*
+ * 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 "DeleteSelectionCommand.h"
+
+#include "CSSMutableStyleDeclaration.h"
+#include "Document.h"
+#include "DocumentFragment.h"
+#include "Editor.h"
+#include "EditorClient.h"
+#include "Element.h"
+#include "Frame.h"
+#include "Logging.h"
+#include "CSSComputedStyleDeclaration.h"
+#include "htmlediting.h"
+#include "HTMLInputElement.h"
+#include "HTMLNames.h"
+#include "markup.h"
+#include "RenderTableCell.h"
+#include "ReplaceSelectionCommand.h"
+#include "Text.h"
+#include "TextIterator.h"
+#include "visible_units.h"
+#include "ApplyStyleCommand.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(firstDeepEditingPositionForNode(cell)) == VisiblePosition(lastDeepEditingPositionForNode(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)
+ : CompositeEditCommand(document),
+ m_hasSelectionToDelete(false),
+ m_smartDelete(smartDelete),
+ m_mergeBlocksAfterDelete(mergeBlocksAfterDelete),
+ m_replace(replace),
+ m_expandForSpecialElements(expandForSpecialElements),
+ m_pruneStartBlockIfNecessary(false),
+ m_startsAtEmptyLine(false),
+ 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)
+ : CompositeEditCommand(selection.start().node()->document()),
+ m_hasSelectionToDelete(true),
+ m_smartDelete(smartDelete),
+ m_mergeBlocksAfterDelete(mergeBlocksAfterDelete),
+ m_replace(replace),
+ m_expandForSpecialElements(expandForSpecialElements),
+ m_pruneStartBlockIfNecessary(false),
+ m_startsAtEmptyLine(false),
+ 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.node()->hasTagName(hrTag))
+ start = Position(start.node(), 0);
+ else if (end.node()->hasTagName(hrTag))
+ end = Position(end.node(), 1);
+
+ // 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));
+}
+
+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, false);
+ Node* endCell = enclosingNodeOfType(m_downstreamEnd, &isTableCell, false);
+ // 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 the positions through rangeCompliantEquivalent, since some editing positions
+ // that appear inside their nodes aren't really inside them. [hr, 0] is one example.
+ // FIXME: rangeComplaintEquivalent 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(rangeCompliantEquivalent(m_downstreamStart), &isBlock, false);
+ m_endBlock = enclosingNodeOfType(rangeCompliantEquivalent(m_upstreamEnd), &isBlock, false);
+}
+
+static void removeEnclosingAnchorStyle(CSSMutableStyleDeclaration* style, const Position& position)
+{
+ Node* enclosingAnchor = enclosingAnchorElement(position);
+ if (!enclosingAnchor || !enclosingAnchor->parentNode())
+ return;
+
+ removeStylesAddedByNode(style, enclosingAnchor);
+}
+
+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.node() == m_downstreamEnd.node() && m_upstreamStart.node()->isTextNode())
+ return;
+
+ // Figure out the typing style in effect before the delete is done.
+ m_typingStyle = ApplyStyleCommand::editingStyleAtPosition(positionBeforeTabSpan(m_selectionToDelete.start()));
+
+ removeEnclosingAnchorStyle(m_typingStyle.get(), 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 (nearestMailBlockquote(m_selectionToDelete.start().node()))
+ m_deleteIntoBlockquoteStyle = ApplyStyleCommand::editingStyleAtPosition(m_selectionToDelete.end());
+ else
+ m_deleteIntoBlockquoteStyle = 0;
+}
+
+bool DeleteSelectionCommand::handleSpecialCaseBRDelete()
+{
+ // Check for special-case where the selection contains only a BR on a line by itself after another BR.
+ bool upstreamStartIsBR = m_upstreamStart.node()->hasTagName(brTag);
+ bool downstreamStartIsBR = m_downstreamStart.node()->hasTagName(brTag);
+ bool isBROnLineByItself = upstreamStartIsBR && downstreamStartIsBR && m_downstreamStart.node() == m_upstreamEnd.node();
+ if (isBROnLineByItself) {
+ removeNode(m_downstreamStart.node());
+ return true;
+ }
+
+ // Not a special-case delete per se, but we can detect that the merging of content between blocks
+ // should not be done.
+ if (upstreamStartIsBR && downstreamStartIsBR) {
+ m_startsAtEmptyLine = true;
+ m_endingPosition = m_downstreamEnd;
+ }
+
+ return false;
+}
+
+static void updatePositionForNodeRemoval(Node* node, Position& position)
+{
+ if (position.isNull())
+ return;
+ if (node->parent() == position.node() && node->nodeIndex() < (unsigned)position.deprecatedEditingOffset())
+ position = Position(position.node(), position.deprecatedEditingOffset() - 1);
+ if (position.node() == node || position.node()->isDescendantOf(node))
+ position = positionInParentBeforeNode(node);
+}
+
+void DeleteSelectionCommand::removeNode(PassRefPtr<Node> node)
+{
+ 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()->isContentEditable()) {
+ // 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());
+ // 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 == node->rootEditableElement()) {
+ // 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);
+ }
+
+ // make sure empty cell has some height
+ updateLayout();
+ RenderObject *r = node->renderer();
+ if (r && r->isTableCell() && toRenderTableCell(r)->contentHeight() <= 0)
+ insertBlockPlaceholder(Position(node, 0));
+ return;
+ }
+
+ if (node == m_startBlock && !isEndOfBlock(VisiblePosition(firstDeepEditingPositionForNode(m_startBlock.get())).previous()))
+ m_needPlaceholder = true;
+ else if (node == m_endBlock && !isStartOfBlock(VisiblePosition(lastDeepEditingPositionForNode(m_startBlock.get())).next()))
+ m_needPlaceholder = true;
+
+ // FIXME: Update the endpoints of the range being deleted.
+ updatePositionForNodeRemoval(node.get(), m_endingPosition);
+ updatePositionForNodeRemoval(node.get(), m_leadingWhitespace);
+ updatePositionForNodeRemoval(node.get(), m_trailingWhitespace);
+
+ CompositeEditCommand::removeNode(node);
+}
+
+static void updatePositionForTextRemoval(Node* node, int offset, int count, Position& position)
+{
+ if (position.node() == node) {
+ if (position.deprecatedEditingOffset() > offset + count)
+ position = Position(position.node(), position.deprecatedEditingOffset() - count);
+ else if (position.deprecatedEditingOffset() > offset)
+ position = Position(position.node(), 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::handleGeneralDelete()
+{
+ int startOffset = m_upstreamStart.deprecatedEditingOffset();
+ Node* startNode = m_upstreamStart.node();
+
+ // Never remove the start block unless it's a table, in which case we won't merge content in.
+ if (startNode == m_startBlock && startOffset == 0 && canHaveChildrenForEditing(startNode) && !startNode->hasTagName(tableTag)) {
+ startOffset = 0;
+ startNode = startNode->traverseNextNode();
+ }
+
+ if (startOffset >= caretMaxOffset(startNode) && startNode->isTextNode()) {
+ Text *text = static_cast<Text *>(startNode);
+ if (text->length() > (unsigned)caretMaxOffset(startNode))
+ deleteTextFromNode(text, caretMaxOffset(startNode), text->length() - caretMaxOffset(startNode));
+ }
+
+ if (startOffset >= lastOffsetForEditing(startNode)) {
+ startNode = startNode->traverseNextSibling();
+ startOffset = 0;
+ }
+
+ // Done adjusting the start. See if we're all done.
+ if (!startNode)
+ return;
+
+ if (startNode == m_downstreamEnd.node()) {
+ // The selection to delete is all in one node.
+ if (!startNode->renderer() || (startOffset == 0 && m_downstreamEnd.atLastEditingPositionForNode())) {
+ // just delete
+ removeNode(startNode);
+ } else if (m_downstreamEnd.deprecatedEditingOffset() - startOffset > 0) {
+ if (startNode->isTextNode()) {
+ // in a text node that needs to be trimmed
+ Text* text = static_cast<Text*>(startNode);
+ deleteTextFromNode(text, startOffset, m_downstreamEnd.deprecatedEditingOffset() - startOffset);
+ } else {
+ removeChildrenInRange(startNode, startOffset, m_downstreamEnd.deprecatedEditingOffset());
+ m_endingPosition = m_upstreamStart;
+ }
+ }
+ }
+ else {
+ bool startNodeWasDescendantOfEndNode = m_upstreamStart.node()->isDescendantOf(m_downstreamEnd.node());
+ // 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 = static_cast<Text *>(node.get());
+ deleteTextFromNode(text, startOffset, text->length() - startOffset);
+ node = node->traverseNextNode();
+ } else {
+ node = startNode->childNode(startOffset);
+ }
+ }
+
+ // handle deleting all nodes that are completely selected
+ while (node && node != m_downstreamEnd.node()) {
+ if (comparePositions(Position(node.get(), 0), m_downstreamEnd) >= 0) {
+ // traverseNextSibling just blew past the end position, so stop deleting
+ node = 0;
+ } else if (!m_downstreamEnd.node()->isDescendantOf(node.get())) {
+ RefPtr<Node> nextNode = node->traverseNextSibling();
+ // if we just removed a node from the end container, update end position so the
+ // check above will work
+ if (node->parentNode() == m_downstreamEnd.node()) {
+ ASSERT(node->nodeIndex() < (unsigned)m_downstreamEnd.deprecatedEditingOffset());
+ m_downstreamEnd = Position(m_downstreamEnd.node(), m_downstreamEnd.deprecatedEditingOffset() - 1);
+ }
+ removeNode(node.get());
+ node = nextNode.get();
+ } else {
+ Node* n = node->lastDescendant();
+ if (m_downstreamEnd.node() == n && m_downstreamEnd.deprecatedEditingOffset() >= caretMaxOffset(n)) {
+ removeNode(node.get());
+ node = 0;
+ } else
+ node = node->traverseNextNode();
+ }
+ }
+
+ if (m_downstreamEnd.node() != startNode && !m_upstreamStart.node()->isDescendantOf(m_downstreamEnd.node()) && m_downstreamEnd.node()->inDocument() && m_downstreamEnd.deprecatedEditingOffset() >= caretMinOffset(m_downstreamEnd.node())) {
+ if (m_downstreamEnd.atLastEditingPositionForNode() && !canHaveChildrenForEditing(m_downstreamEnd.node())) {
+ // The node itself is fully selected, not just its contents. Delete it.
+ removeNode(m_downstreamEnd.node());
+ } else {
+ if (m_downstreamEnd.node()->isTextNode()) {
+ // in a text node that needs to be trimmed
+ Text *text = static_cast<Text *>(m_downstreamEnd.node());
+ if (m_downstreamEnd.deprecatedEditingOffset() > 0) {
+ deleteTextFromNode(text, 0, m_downstreamEnd.deprecatedEditingOffset());
+ }
+ // Remove children of m_downstreamEnd.node() that come after m_upstreamStart.
+ // Don't try to remove children if m_upstreamStart was inside m_downstreamEnd.node()
+ // 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.node()->inDocument())) {
+ int offset = 0;
+ if (m_upstreamStart.node()->isDescendantOf(m_downstreamEnd.node())) {
+ Node *n = m_upstreamStart.node();
+ while (n && n->parentNode() != m_downstreamEnd.node())
+ n = n->parentNode();
+ if (n)
+ offset = n->nodeIndex() + 1;
+ }
+ removeChildrenInRange(m_downstreamEnd.node(), offset, m_downstreamEnd.deprecatedEditingOffset());
+ m_downstreamEnd = Position(m_downstreamEnd.node(), offset);
+ }
+ }
+ }
+ }
+}
+
+void DeleteSelectionCommand::fixupWhitespace()
+{
+ updateLayout();
+ // FIXME: isRenderedCharacter should be removed, and we should use VisiblePosition::characterAfter and VisiblePosition::characterBefore
+ if (m_leadingWhitespace.isNotNull() && !m_leadingWhitespace.isRenderedCharacter() && m_leadingWhitespace.node()->isTextNode()) {
+ Text* textNode = static_cast<Text*>(m_leadingWhitespace.node());
+ ASSERT(!textNode->renderer() || textNode->renderer()->style()->collapseWhiteSpace());
+ replaceTextInNode(textNode, m_leadingWhitespace.deprecatedEditingOffset(), 1, nonBreakingSpaceString());
+ }
+ if (m_trailingWhitespace.isNotNull() && !m_trailingWhitespace.isRenderedCharacter() && m_trailingWhitespace.node()->isTextNode()) {
+ Text* textNode = static_cast<Text*>(m_trailingWhitespace.node());
+ ASSERT(!textNode->renderer() ||textNode->renderer()->style()->collapseWhiteSpace());
+ replaceTextInNode(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.node()->inDocument() || !m_upstreamStart.node()->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 = static_cast<Element*>(enclosingBlock(m_downstreamEnd.node()));
+ if (!startOfParagraphToMove.deepEquivalent().node() || !endBlock->contains(startOfParagraphToMove.deepEquivalent().node())) {
+ removeNode(enclosingBlock(m_downstreamEnd.node()));
+ return;
+ }
+
+ // We need to merge into m_upstreamStart's block, but it's been emptied out and collapsed by deletion.
+ if (!mergeDestination.deepEquivalent().node() || !mergeDestination.deepEquivalent().node()->isDescendantOf(m_upstreamStart.node()->enclosingBlockFlowElement()) || m_startsAtEmptyLine) {
+ 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().node()->hasTagName(brTag)) {
+ removeNodeAndPruneAncestors(mergeDestination.deepEquivalent().downstream().node());
+ 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().node()) && !isStartOfParagraph(mergeDestination)) {
+ m_endingPosition = m_upstreamStart;
+ return;
+ }
+
+ RefPtr<Range> range = Range::create(document(), rangeCompliantEquivalent(startOfParagraphToMove.deepEquivalent()), rangeCompliantEquivalent(endOfParagraphToMove.deepEquivalent()));
+ RefPtr<Range> rangeToBeReplaced = Range::create(document(), rangeCompliantEquivalent(mergeDestination.deepEquivalent()), rangeCompliantEquivalent(mergeDestination.deepEquivalent()));
+ if (!document()->frame()->editor()->client()->shouldMoveRangeAfterDelete(range.get(), rangeToBeReplaced.get()))
+ 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;
+ moveParagraph(startOfParagraphToMove, endOfParagraphToMove, mergeDestination);
+ 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.node()->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()
+{
+ if (!m_typingStyle)
+ 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 && !nearestMailBlockquote(m_endingPosition.node()))
+ m_typingStyle = m_deleteIntoBlockquoteStyle;
+ m_deleteIntoBlockquoteStyle = 0;
+
+ prepareEditingStyleToApplyAt(m_typingStyle.get(), m_endingPosition);
+ if (!m_typingStyle->length())
+ m_typingStyle = 0;
+ VisiblePosition visibleEnd(m_endingPosition);
+ if (m_typingStyle &&
+ isStartOfParagraph(visibleEnd) &&
+ isEndOfParagraph(visibleEnd) &&
+ lineBreakExistsAtVisiblePosition(visibleEnd)) {
+ // Apply style to the placeholder that is now holding open the empty paragraph.
+ // This makes sure that the paragraph has the right height, and that the paragraph
+ // takes on the right style and retains it even if you move the selection away and
+ // then move it back (which will clear typing style).
+
+ setEndingSelection(visibleEnd);
+ applyStyle(m_typingStyle.get(), EditActionUnspecified);
+ // applyStyle can destroy the placeholder that was at m_endingPosition if it needs to
+ // move it, but it will set an endingSelection() at [movedPlaceholder, 0] if it does so.
+ m_endingPosition = endingSelection().start();
+ 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()->setTypingStyle(m_typingStyle.get());
+}
+
+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();
+}
+
+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.isRange())
+ return;
+
+ // 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.
+ if (!m_replace) {
+ Node* startNode = m_selectionToDelete.start().node();
+ Node* ancestorNode = startNode ? startNode->shadowAncestorNode() : 0;
+ if (ancestorNode && ancestorNode->hasTagName(inputTag)
+ && static_cast<HTMLInputElement*>(ancestorNode)->isTextField()
+ && ancestorNode->focused())
+ document()->frame()->textWillBeDeletedInTextField(static_cast<Element*>(ancestorNode));
+ }
+
+ // save this to later make the selection with
+ EAffinity affinity = m_selectionToDelete.affinity();
+
+ Position downstreamEnd = m_selectionToDelete.end().downstream();
+ m_needPlaceholder = isStartOfParagraph(m_selectionToDelete.visibleStart()) &&
+ isEndOfParagraph(m_selectionToDelete.visibleEnd()) &&
+ !lineBreakExistsAtVisiblePosition(m_selectionToDelete.visibleEnd());
+ 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().node()->isDescendantOf(table))
+ m_needPlaceholder = false;
+ }
+
+
+ // set up our state
+ initializePositionData();
+
+ // 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));
+ clearTransientState();
+ rebalanceWhitespace();
+ return;
+ }
+
+ handleGeneralDelete();
+
+ fixupWhitespace();
+
+ mergeParagraphs();
+
+ removePreviouslySelectedEmptyTableRows();
+
+ RefPtr<Node> placeholder = m_needPlaceholder ? createBreakElement(document()).get() : 0;
+
+ if (placeholder)
+ insertNodeAt(placeholder.get(), m_endingPosition);
+
+ rebalanceWhitespaceAt(m_endingPosition);
+
+ calculateTypingStyleAfterDelete();
+
+ setEndingSelection(VisibleSelection(m_endingPosition, affinity));
+ 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