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27 #include "core/editing/BreakBlockquoteCommand.h"
29 #include "core/HTMLNames.h"
30 #include "core/dom/NodeTraversal.h"
31 #include "core/dom/Text.h"
32 #include "core/editing/VisiblePosition.h"
33 #include "core/editing/htmlediting.h"
34 #include "core/html/HTMLBRElement.h"
35 #include "core/html/HTMLElement.h"
36 #include "core/html/HTMLQuoteElement.h"
37 #include "core/rendering/RenderListItem.h"
41 using namespace HTMLNames;
43 BreakBlockquoteCommand::BreakBlockquoteCommand(Document& document)
44 : CompositeEditCommand(document)
48 void BreakBlockquoteCommand::doApply()
50 if (endingSelection().isNone())
53 // Delete the current selection.
54 if (endingSelection().isRange())
55 deleteSelection(false, false);
57 // This is a scenario that should never happen, but we want to
58 // make sure we don't dereference a null pointer below.
60 ASSERT(!endingSelection().isNone());
62 if (endingSelection().isNone())
65 VisiblePosition visiblePos = endingSelection().visibleStart();
67 // pos is a position equivalent to the caret. We use downstream() so that pos will
68 // be in the first node that we need to move (there are a few exceptions to this, see below).
69 Position pos = endingSelection().start().downstream();
71 // Find the top-most blockquote from the start.
72 HTMLQuoteElement* topBlockquote = toHTMLQuoteElement(highestEnclosingNodeOfType(pos, isMailHTMLBlockquoteElement));
73 if (!topBlockquote || !topBlockquote->parentNode())
76 RefPtrWillBeRawPtr<HTMLBRElement> breakElement = createBreakElement(document());
78 bool isLastVisPosInNode = isLastVisiblePositionInNode(visiblePos, topBlockquote);
80 // If the position is at the beginning of the top quoted content, we don't need to break the quote.
81 // Instead, insert the break before the blockquote, unless the position is as the end of the the quoted content.
82 if (isFirstVisiblePositionInNode(visiblePos, topBlockquote) && !isLastVisPosInNode) {
83 insertNodeBefore(breakElement.get(), topBlockquote);
84 setEndingSelection(VisibleSelection(positionBeforeNode(breakElement.get()), DOWNSTREAM, endingSelection().isDirectional()));
85 rebalanceWhitespace();
89 // Insert a break after the top blockquote.
90 insertNodeAfter(breakElement.get(), topBlockquote);
92 // If we're inserting the break at the end of the quoted content, we don't need to break the quote.
93 if (isLastVisPosInNode) {
94 setEndingSelection(VisibleSelection(positionBeforeNode(breakElement.get()), DOWNSTREAM, endingSelection().isDirectional()));
95 rebalanceWhitespace();
99 // Don't move a line break just after the caret. Doing so would create an extra, empty paragraph
100 // in the new blockquote.
101 if (lineBreakExistsAtVisiblePosition(visiblePos))
104 // Adjust the position so we don't split at the beginning of a quote.
105 while (isFirstVisiblePositionInNode(VisiblePosition(pos), toHTMLQuoteElement(enclosingNodeOfType(pos, isMailHTMLBlockquoteElement))))
106 pos = pos.previous();
108 // startNode is the first node that we need to move to the new blockquote.
109 Node* startNode = pos.deprecatedNode();
112 // Split at pos if in the middle of a text node.
113 if (startNode->isTextNode()) {
114 Text* textNode = toText(startNode);
115 if ((unsigned)pos.deprecatedEditingOffset() >= textNode->length()) {
116 startNode = NodeTraversal::next(*startNode);
118 } else if (pos.deprecatedEditingOffset() > 0)
119 splitTextNode(textNode, pos.deprecatedEditingOffset());
120 } else if (pos.deprecatedEditingOffset() > 0) {
121 Node* childAtOffset = NodeTraversal::childAt(*startNode, pos.deprecatedEditingOffset());
122 startNode = childAtOffset ? childAtOffset : NodeTraversal::next(*startNode);
126 // If there's nothing inside topBlockquote to move, we're finished.
127 if (!startNode->isDescendantOf(topBlockquote)) {
128 setEndingSelection(VisibleSelection(VisiblePosition(firstPositionInOrBeforeNode(startNode)), endingSelection().isDirectional()));
132 // Build up list of ancestors in between the start node and the top blockquote.
133 WillBeHeapVector<RefPtrWillBeMember<Element> > ancestors;
134 for (Element* node = startNode->parentElement(); node && node != topBlockquote; node = node->parentElement())
135 ancestors.append(node);
137 // Insert a clone of the top blockquote after the break.
138 RefPtrWillBeRawPtr<Element> clonedBlockquote = topBlockquote->cloneElementWithoutChildren();
139 insertNodeAfter(clonedBlockquote.get(), breakElement.get());
141 // Clone startNode's ancestors into the cloned blockquote.
142 // On exiting this loop, clonedAncestor is the lowest ancestor
143 // that was cloned (i.e. the clone of either ancestors.last()
144 // or clonedBlockquote if ancestors is empty).
145 RefPtrWillBeRawPtr<Element> clonedAncestor = clonedBlockquote;
146 for (size_t i = ancestors.size(); i != 0; --i) {
147 RefPtrWillBeRawPtr<Element> clonedChild = ancestors[i - 1]->cloneElementWithoutChildren();
148 // Preserve list item numbering in cloned lists.
149 if (isHTMLOListElement(*clonedChild)) {
150 Node* listChildNode = i > 1 ? ancestors[i - 2].get() : startNode;
151 // The first child of the cloned list might not be a list item element,
152 // find the first one so that we know where to start numbering.
153 while (listChildNode && !isHTMLLIElement(*listChildNode))
154 listChildNode = listChildNode->nextSibling();
155 if (listChildNode && listChildNode->renderer() && listChildNode->renderer()->isListItem())
156 setNodeAttribute(clonedChild, startAttr, AtomicString::number(toRenderListItem(listChildNode->renderer())->value()));
159 appendNode(clonedChild.get(), clonedAncestor.get());
160 clonedAncestor = clonedChild;
163 moveRemainingSiblingsToNewParent(startNode, 0, clonedAncestor);
165 if (!ancestors.isEmpty()) {
166 // Split the tree up the ancestor chain until the topBlockquote
167 // Throughout this loop, clonedParent is the clone of ancestor's parent.
168 // This is so we can clone ancestor's siblings and place the clones
169 // into the clone corresponding to the ancestor's parent.
170 RefPtrWillBeRawPtr<Element> ancestor = nullptr;
171 RefPtrWillBeRawPtr<Element> clonedParent = nullptr;
172 for (ancestor = ancestors.first(), clonedParent = clonedAncestor->parentElement();
173 ancestor && ancestor != topBlockquote;
174 ancestor = ancestor->parentElement(), clonedParent = clonedParent->parentElement())
175 moveRemainingSiblingsToNewParent(ancestor->nextSibling(), 0, clonedParent);
177 // If the startNode's original parent is now empty, remove it
178 Element* originalParent = ancestors.first().get();
179 if (!originalParent->hasChildren())
180 removeNode(originalParent);
183 // Make sure the cloned block quote renders.
184 addBlockPlaceholderIfNeeded(clonedBlockquote.get());
186 // Put the selection right before the break.
187 setEndingSelection(VisibleSelection(positionBeforeNode(breakElement.get()), DOWNSTREAM, endingSelection().isDirectional()));
188 rebalanceWhitespace();