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1 /*
2  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  * 1. Redistributions of source code must retain the above copyright
8  *    notice, this list of conditions and the following disclaimer.
9  * 2. Redistributions in binary form must reproduce the above copyright
10  *    notice, this list of conditions and the following disclaimer in the
11  *    documentation and/or other materials provided with the distribution.
12  *
13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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,
18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (IndentOutdentCommandINCLUDING, BUT NOT LIMITED TO,
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
22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24  */
25 
26 #include "config.h"
27 #include "core/editing/IndentOutdentCommand.h"
28 
29 #include "core/HTMLNames.h"
30 #include "core/dom/Document.h"
31 #include "core/dom/ElementTraversal.h"
32 #include "core/editing/InsertListCommand.h"
33 #include "core/editing/VisibleUnits.h"
34 #include "core/editing/htmlediting.h"
35 #include "core/html/HTMLBRElement.h"
36 #include "core/html/HTMLElement.h"
37 #include "core/rendering/RenderObject.h"
38 
39 namespace blink {
40 
41 using namespace HTMLNames;
42 
isHTMLListOrBlockquoteElement(const Node * node)43 static bool isHTMLListOrBlockquoteElement(const Node* node)
44 {
45     if (!node || !node->isHTMLElement())
46         return false;
47     const HTMLElement& element = toHTMLElement(*node);
48     return isHTMLUListElement(element) || isHTMLOListElement(element) || element.hasTagName(blockquoteTag);
49 }
50 
IndentOutdentCommand(Document & document,EIndentType typeOfAction)51 IndentOutdentCommand::IndentOutdentCommand(Document& document, EIndentType typeOfAction)
52     : ApplyBlockElementCommand(document, blockquoteTag, "margin: 0 0 0 40px; border: none; padding: 0px;")
53     , m_typeOfAction(typeOfAction)
54 {
55 }
56 
tryIndentingAsListItem(const Position & start,const Position & end)57 bool IndentOutdentCommand::tryIndentingAsListItem(const Position& start, const Position& end)
58 {
59     // If our selection is not inside a list, bail out.
60     RefPtrWillBeRawPtr<Node> lastNodeInSelectedParagraph = start.deprecatedNode();
61     RefPtrWillBeRawPtr<HTMLElement> listElement = enclosingList(lastNodeInSelectedParagraph.get());
62     if (!listElement)
63         return false;
64 
65     // Find the block that we want to indent.  If it's not a list item (e.g., a div inside a list item), we bail out.
66     RefPtrWillBeRawPtr<Element> selectedListItem = enclosingBlock(lastNodeInSelectedParagraph.get());
67 
68     // FIXME: we need to deal with the case where there is no li (malformed HTML)
69     if (!isHTMLLIElement(selectedListItem))
70         return false;
71 
72     // FIXME: previousElementSibling does not ignore non-rendered content like <span></span>.  Should we?
73     RefPtrWillBeRawPtr<Element> previousList = ElementTraversal::previousSibling(*selectedListItem);
74     RefPtrWillBeRawPtr<Element> nextList = ElementTraversal::nextSibling(*selectedListItem);
75 
76     // We should calculate visible range in list item because inserting new
77     // list element will change visibility of list item, e.g. :first-child
78     // CSS selector.
79     RefPtrWillBeRawPtr<HTMLElement> newList = toHTMLElement(document().createElement(listElement->tagQName(), false).get());
80     insertNodeBefore(newList, selectedListItem.get());
81 
82     // We should clone all the children of the list item for indenting purposes. However, in case the current
83     // selection does not encompass all its children, we need to explicitally handle the same. The original
84     // list item too would require proper deletion in that case.
85     if (end.anchorNode() == selectedListItem.get() || end.anchorNode()->isDescendantOf(selectedListItem->lastChild())) {
86         moveParagraphWithClones(VisiblePosition(start), VisiblePosition(end), newList.get(), selectedListItem.get());
87     } else {
88         moveParagraphWithClones(VisiblePosition(start), VisiblePosition(positionAfterNode(selectedListItem->lastChild())), newList.get(), selectedListItem.get());
89         removeNode(selectedListItem.get());
90     }
91 
92     if (canMergeLists(previousList.get(), newList.get()))
93         mergeIdenticalElements(previousList.get(), newList.get());
94     if (canMergeLists(newList.get(), nextList.get()))
95         mergeIdenticalElements(newList.get(), nextList.get());
96 
97     return true;
98 }
99 
indentIntoBlockquote(const Position & start,const Position & end,RefPtrWillBeRawPtr<HTMLElement> & targetBlockquote)100 void IndentOutdentCommand::indentIntoBlockquote(const Position& start, const Position& end, RefPtrWillBeRawPtr<HTMLElement>& targetBlockquote)
101 {
102     Element* enclosingCell = toElement(enclosingNodeOfType(start, &isTableCell));
103     Element* elementToSplitTo;
104     if (enclosingCell)
105         elementToSplitTo = enclosingCell;
106     else if (enclosingList(start.containerNode()))
107         elementToSplitTo = enclosingBlock(start.containerNode());
108     else
109         elementToSplitTo = editableRootForPosition(start);
110 
111     if (!elementToSplitTo)
112         return;
113 
114     RefPtrWillBeRawPtr<Node> outerBlock = (start.containerNode() == elementToSplitTo) ? start.containerNode() : splitTreeToNode(start.containerNode(), elementToSplitTo).get();
115 
116     VisiblePosition startOfContents(start);
117     if (!targetBlockquote) {
118         // Create a new blockquote and insert it as a child of the root editable element. We accomplish
119         // this by splitting all parents of the current paragraph up to that point.
120         targetBlockquote = createBlockElement();
121         if (outerBlock == start.containerNode())
122             insertNodeAt(targetBlockquote, start);
123         else
124             insertNodeBefore(targetBlockquote, outerBlock);
125         startOfContents = VisiblePosition(positionInParentAfterNode(*targetBlockquote));
126     }
127 
128     VisiblePosition endOfContents(end);
129     if (startOfContents.isNull() || endOfContents.isNull())
130         return;
131     moveParagraphWithClones(startOfContents, endOfContents, targetBlockquote.get(), outerBlock.get());
132 }
133 
outdentParagraph()134 void IndentOutdentCommand::outdentParagraph()
135 {
136     VisiblePosition visibleStartOfParagraph = startOfParagraph(endingSelection().visibleStart());
137     VisiblePosition visibleEndOfParagraph = endOfParagraph(visibleStartOfParagraph);
138 
139     HTMLElement* enclosingElement = toHTMLElement(enclosingNodeOfType(visibleStartOfParagraph.deepEquivalent(), &isHTMLListOrBlockquoteElement));
140     if (!enclosingElement || !enclosingElement->parentNode()->hasEditableStyle()) // We can't outdent if there is no place to go!
141         return;
142 
143     // Use InsertListCommand to remove the selection from the list
144     if (isHTMLOListElement(*enclosingElement)) {
145         applyCommandToComposite(InsertListCommand::create(document(), InsertListCommand::OrderedList));
146         return;
147     }
148     if (isHTMLUListElement(*enclosingElement)) {
149         applyCommandToComposite(InsertListCommand::create(document(), InsertListCommand::UnorderedList));
150         return;
151     }
152 
153     // The selection is inside a blockquote i.e. enclosingNode is a blockquote
154     VisiblePosition positionInEnclosingBlock = VisiblePosition(firstPositionInNode(enclosingElement));
155     // If the blockquote is inline, the start of the enclosing block coincides with
156     // positionInEnclosingBlock.
157     VisiblePosition startOfEnclosingBlock = (enclosingElement->renderer() && enclosingElement->renderer()->isInline()) ? positionInEnclosingBlock : startOfBlock(positionInEnclosingBlock);
158     VisiblePosition lastPositionInEnclosingBlock = VisiblePosition(lastPositionInNode(enclosingElement));
159     VisiblePosition endOfEnclosingBlock = endOfBlock(lastPositionInEnclosingBlock);
160     if (visibleStartOfParagraph == startOfEnclosingBlock &&
161         visibleEndOfParagraph == endOfEnclosingBlock) {
162         // The blockquote doesn't contain anything outside the paragraph, so it can be totally removed.
163         Node* splitPoint = enclosingElement->nextSibling();
164         removeNodePreservingChildren(enclosingElement);
165         // outdentRegion() assumes it is operating on the first paragraph of an enclosing blockquote, but if there are multiply nested blockquotes and we've
166         // just removed one, then this assumption isn't true. By splitting the next containing blockquote after this node, we keep this assumption true
167         if (splitPoint) {
168             if (Element* splitPointParent = splitPoint->parentElement()) {
169                 if (splitPointParent->hasTagName(blockquoteTag)
170                     && !splitPoint->hasTagName(blockquoteTag)
171                     && splitPointParent->parentNode()->hasEditableStyle()) // We can't outdent if there is no place to go!
172                     splitElement(splitPointParent, splitPoint);
173             }
174         }
175 
176         document().updateLayoutIgnorePendingStylesheets();
177         visibleStartOfParagraph = VisiblePosition(visibleStartOfParagraph.deepEquivalent());
178         visibleEndOfParagraph = VisiblePosition(visibleEndOfParagraph.deepEquivalent());
179         if (visibleStartOfParagraph.isNotNull() && !isStartOfParagraph(visibleStartOfParagraph))
180             insertNodeAt(createBreakElement(document()), visibleStartOfParagraph.deepEquivalent());
181         if (visibleEndOfParagraph.isNotNull() && !isEndOfParagraph(visibleEndOfParagraph))
182             insertNodeAt(createBreakElement(document()), visibleEndOfParagraph.deepEquivalent());
183 
184         return;
185     }
186     RefPtrWillBeRawPtr<Node> splitBlockquoteNode = enclosingElement;
187     if (Element* enclosingBlockFlow = enclosingBlock(visibleStartOfParagraph.deepEquivalent().deprecatedNode())) {
188         if (enclosingBlockFlow != enclosingElement) {
189             splitBlockquoteNode = splitTreeToNode(enclosingBlockFlow, enclosingElement, true);
190         } else {
191             // We split the blockquote at where we start outdenting.
192             Node* highestInlineNode = highestEnclosingNodeOfType(visibleStartOfParagraph.deepEquivalent(), isInline, CannotCrossEditingBoundary, enclosingBlockFlow);
193             splitElement(enclosingElement, highestInlineNode ? highestInlineNode : visibleStartOfParagraph.deepEquivalent().deprecatedNode());
194         }
195     }
196     VisiblePosition startOfParagraphToMove(startOfParagraph(visibleStartOfParagraph));
197     VisiblePosition endOfParagraphToMove(endOfParagraph(visibleEndOfParagraph));
198     if (startOfParagraphToMove.isNull() || endOfParagraphToMove.isNull())
199         return;
200     RefPtrWillBeRawPtr<HTMLBRElement> placeholder = createBreakElement(document());
201     insertNodeBefore(placeholder, splitBlockquoteNode);
202     moveParagraph(startOfParagraphToMove, endOfParagraphToMove, VisiblePosition(positionBeforeNode(placeholder.get())), true);
203 }
204 
205 // FIXME: We should merge this function with ApplyBlockElementCommand::formatSelection
outdentRegion(const VisiblePosition & startOfSelection,const VisiblePosition & endOfSelection)206 void IndentOutdentCommand::outdentRegion(const VisiblePosition& startOfSelection, const VisiblePosition& endOfSelection)
207 {
208     VisiblePosition endOfCurrentParagraph = endOfParagraph(startOfSelection);
209     VisiblePosition endOfLastParagraph = endOfParagraph(endOfSelection);
210 
211     if (endOfCurrentParagraph == endOfLastParagraph) {
212         outdentParagraph();
213         return;
214     }
215 
216     Position originalSelectionEnd = endingSelection().end();
217     VisiblePosition endAfterSelection = endOfParagraph(endOfLastParagraph.next());
218 
219     while (endOfCurrentParagraph != endAfterSelection) {
220         VisiblePosition endOfNextParagraph = endOfParagraph(endOfCurrentParagraph.next());
221         if (endOfCurrentParagraph == endOfLastParagraph)
222             setEndingSelection(VisibleSelection(originalSelectionEnd, DOWNSTREAM));
223         else
224             setEndingSelection(endOfCurrentParagraph);
225 
226         outdentParagraph();
227 
228         // outdentParagraph could move more than one paragraph if the paragraph
229         // is in a list item. As a result, endAfterSelection and endOfNextParagraph
230         // could refer to positions no longer in the document.
231         if (endAfterSelection.isNotNull() && !endAfterSelection.deepEquivalent().inDocument())
232             break;
233 
234         if (endOfNextParagraph.isNotNull() && !endOfNextParagraph.deepEquivalent().inDocument()) {
235             endOfCurrentParagraph = VisiblePosition(endingSelection().end());
236             endOfNextParagraph = endOfParagraph(endOfCurrentParagraph.next());
237         }
238         endOfCurrentParagraph = endOfNextParagraph;
239     }
240 }
241 
formatSelection(const VisiblePosition & startOfSelection,const VisiblePosition & endOfSelection)242 void IndentOutdentCommand::formatSelection(const VisiblePosition& startOfSelection, const VisiblePosition& endOfSelection)
243 {
244     if (m_typeOfAction == Indent)
245         ApplyBlockElementCommand::formatSelection(startOfSelection, endOfSelection);
246     else
247         outdentRegion(startOfSelection, endOfSelection);
248 }
249 
formatRange(const Position & start,const Position & end,const Position &,RefPtrWillBeRawPtr<HTMLElement> & blockquoteForNextIndent)250 void IndentOutdentCommand::formatRange(const Position& start, const Position& end, const Position&, RefPtrWillBeRawPtr<HTMLElement>& blockquoteForNextIndent)
251 {
252     if (tryIndentingAsListItem(start, end))
253         blockquoteForNextIndent = nullptr;
254     else
255         indentIntoBlockquote(start, end, blockquoteForNextIndent);
256 }
257 
258 }
259