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 "IndentOutdentCommand.h"
28
29 #include "Document.h"
30 #include "Element.h"
31 #include "HTMLBlockquoteElement.h"
32 #include "HTMLNames.h"
33 #include "InsertLineBreakCommand.h"
34 #include "InsertListCommand.h"
35 #include "Range.h"
36 #include "SplitElementCommand.h"
37 #include "Text.h"
38 #include "TextIterator.h"
39 #include "htmlediting.h"
40 #include "visible_units.h"
41 #include <wtf/StdLibExtras.h>
42
43 namespace WebCore {
44
45 using namespace HTMLNames;
46
isListOrIndentBlockquote(const Node * node)47 static bool isListOrIndentBlockquote(const Node* node)
48 {
49 return node && (node->hasTagName(ulTag) || node->hasTagName(olTag) || node->hasTagName(blockquoteTag));
50 }
51
IndentOutdentCommand(Document * document,EIndentType typeOfAction,int marginInPixels)52 IndentOutdentCommand::IndentOutdentCommand(Document* document, EIndentType typeOfAction, int marginInPixels)
53 : ApplyBlockElementCommand(document, blockquoteTag, "webkit-indent-blockquote", "margin: 0 0 0 40px; border: none; padding: 0px;")
54 , m_typeOfAction(typeOfAction)
55 , m_marginInPixels(marginInPixels)
56 {
57 }
58
tryIndentingAsListItem(const Position & start,const Position & end)59 bool IndentOutdentCommand::tryIndentingAsListItem(const Position& start, const Position& end)
60 {
61 // If our selection is not inside a list, bail out.
62 Node* lastNodeInSelectedParagraph = start.deprecatedNode();
63 RefPtr<Element> listNode = enclosingList(lastNodeInSelectedParagraph);
64 if (!listNode)
65 return false;
66
67 // 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.
68 Element* selectedListItem = static_cast<Element*>(enclosingBlock(lastNodeInSelectedParagraph));
69
70 // FIXME: we need to deal with the case where there is no li (malformed HTML)
71 if (!selectedListItem->hasTagName(liTag))
72 return false;
73
74 // FIXME: previousElementSibling does not ignore non-rendered content like <span></span>. Should we?
75 Element* previousList = selectedListItem->previousElementSibling();
76 Element* nextList = selectedListItem->nextElementSibling();
77
78 RefPtr<Element> newList = document()->createElement(listNode->tagQName(), false);
79 insertNodeBefore(newList, selectedListItem);
80
81 moveParagraphWithClones(start, end, newList.get(), selectedListItem);
82
83 if (canMergeLists(previousList, newList.get()))
84 mergeIdenticalElements(previousList, newList);
85 if (canMergeLists(newList.get(), nextList))
86 mergeIdenticalElements(newList, nextList);
87
88 return true;
89 }
90
indentIntoBlockquote(const Position & start,const Position & end,RefPtr<Element> & targetBlockquote)91 void IndentOutdentCommand::indentIntoBlockquote(const Position& start, const Position& end, RefPtr<Element>& targetBlockquote)
92 {
93 Node* enclosingCell = enclosingNodeOfType(start, &isTableCell);
94 Node* nodeToSplitTo;
95 if (enclosingCell)
96 nodeToSplitTo = enclosingCell;
97 else if (enclosingList(start.deprecatedNode()))
98 nodeToSplitTo = enclosingBlock(start.deprecatedNode());
99 else
100 nodeToSplitTo = editableRootForPosition(start);
101
102 if (!nodeToSplitTo)
103 return;
104
105 RefPtr<Node> outerBlock = (start.deprecatedNode() == nodeToSplitTo) ? start.deprecatedNode() : splitTreeToNode(start.deprecatedNode(), nodeToSplitTo);
106
107 if (!targetBlockquote) {
108 // Create a new blockquote and insert it as a child of the root editable element. We accomplish
109 // this by splitting all parents of the current paragraph up to that point.
110 targetBlockquote = createBlockElement();
111 insertNodeBefore(targetBlockquote, outerBlock);
112 }
113
114 moveParagraphWithClones(start, end, targetBlockquote.get(), outerBlock.get());
115 }
116
outdentParagraph()117 void IndentOutdentCommand::outdentParagraph()
118 {
119 VisiblePosition visibleStartOfParagraph = startOfParagraph(endingSelection().visibleStart());
120 VisiblePosition visibleEndOfParagraph = endOfParagraph(visibleStartOfParagraph);
121
122 Node* enclosingNode = enclosingNodeOfType(visibleStartOfParagraph.deepEquivalent(), &isListOrIndentBlockquote);
123 if (!enclosingNode || !enclosingNode->parentNode()->rendererIsEditable()) // We can't outdent if there is no place to go!
124 return;
125
126 // Use InsertListCommand to remove the selection from the list
127 if (enclosingNode->hasTagName(olTag)) {
128 applyCommandToComposite(InsertListCommand::create(document(), InsertListCommand::OrderedList));
129 return;
130 }
131 if (enclosingNode->hasTagName(ulTag)) {
132 applyCommandToComposite(InsertListCommand::create(document(), InsertListCommand::UnorderedList));
133 return;
134 }
135
136 // The selection is inside a blockquote i.e. enclosingNode is a blockquote
137 VisiblePosition positionInEnclosingBlock = VisiblePosition(firstPositionInNode(enclosingNode));
138 // If the blockquote is inline, the start of the enclosing block coincides with
139 // positionInEnclosingBlock.
140 VisiblePosition startOfEnclosingBlock = (enclosingNode->renderer() && enclosingNode->renderer()->isInline()) ? positionInEnclosingBlock : startOfBlock(positionInEnclosingBlock);
141 VisiblePosition lastPositionInEnclosingBlock = VisiblePosition(lastPositionInNode(enclosingNode));
142 VisiblePosition endOfEnclosingBlock = endOfBlock(lastPositionInEnclosingBlock);
143 if (visibleStartOfParagraph == startOfEnclosingBlock &&
144 visibleEndOfParagraph == endOfEnclosingBlock) {
145 // The blockquote doesn't contain anything outside the paragraph, so it can be totally removed.
146 Node* splitPoint = enclosingNode->nextSibling();
147 removeNodePreservingChildren(enclosingNode);
148 // outdentRegion() assumes it is operating on the first paragraph of an enclosing blockquote, but if there are multiply nested blockquotes and we've
149 // just removed one, then this assumption isn't true. By splitting the next containing blockquote after this node, we keep this assumption true
150 if (splitPoint) {
151 if (ContainerNode* splitPointParent = splitPoint->parentNode()) {
152 if (splitPointParent->hasTagName(blockquoteTag)
153 && !splitPoint->hasTagName(blockquoteTag)
154 && splitPointParent->parentNode()->rendererIsEditable()) // We can't outdent if there is no place to go!
155 splitElement(static_cast<Element*>(splitPointParent), splitPoint);
156 }
157 }
158
159 updateLayout();
160 visibleStartOfParagraph = VisiblePosition(visibleStartOfParagraph.deepEquivalent());
161 visibleEndOfParagraph = VisiblePosition(visibleEndOfParagraph.deepEquivalent());
162 if (visibleStartOfParagraph.isNotNull() && !isStartOfParagraph(visibleStartOfParagraph))
163 insertNodeAt(createBreakElement(document()), visibleStartOfParagraph.deepEquivalent());
164 if (visibleEndOfParagraph.isNotNull() && !isEndOfParagraph(visibleEndOfParagraph))
165 insertNodeAt(createBreakElement(document()), visibleEndOfParagraph.deepEquivalent());
166
167 return;
168 }
169 Node* enclosingBlockFlow = enclosingBlock(visibleStartOfParagraph.deepEquivalent().deprecatedNode());
170 RefPtr<Node> splitBlockquoteNode = enclosingNode;
171 if (enclosingBlockFlow != enclosingNode)
172 splitBlockquoteNode = splitTreeToNode(enclosingBlockFlow, enclosingNode, true);
173 else {
174 // We split the blockquote at where we start outdenting.
175 splitElement(static_cast<Element*>(enclosingNode), visibleStartOfParagraph.deepEquivalent().deprecatedNode());
176 }
177 RefPtr<Node> placeholder = createBreakElement(document());
178 insertNodeBefore(placeholder, splitBlockquoteNode);
179 moveParagraph(startOfParagraph(visibleStartOfParagraph), endOfParagraph(visibleEndOfParagraph), positionBeforeNode(placeholder.get()), true);
180 }
181
182 // FIXME: We should merge this function with ApplyBlockElementCommand::formatSelection
outdentRegion(const VisiblePosition & startOfSelection,const VisiblePosition & endOfSelection)183 void IndentOutdentCommand::outdentRegion(const VisiblePosition& startOfSelection, const VisiblePosition& endOfSelection)
184 {
185 VisiblePosition endOfLastParagraph = endOfParagraph(endOfSelection);
186
187 if (endOfParagraph(startOfSelection) == endOfLastParagraph) {
188 outdentParagraph();
189 return;
190 }
191
192 Position originalSelectionEnd = endingSelection().end();
193 VisiblePosition endOfCurrentParagraph = endOfParagraph(startOfSelection);
194 VisiblePosition endAfterSelection = endOfParagraph(endOfParagraph(endOfSelection).next());
195
196 while (endOfCurrentParagraph != endAfterSelection) {
197 VisiblePosition endOfNextParagraph = endOfParagraph(endOfCurrentParagraph.next());
198 if (endOfCurrentParagraph == endOfLastParagraph)
199 setEndingSelection(VisibleSelection(originalSelectionEnd, DOWNSTREAM));
200 else
201 setEndingSelection(endOfCurrentParagraph);
202
203 outdentParagraph();
204
205 // outdentParagraph could move more than one paragraph if the paragraph
206 // is in a list item. As a result, endAfterSelection and endOfNextParagraph
207 // could refer to positions no longer in the document.
208 if (endAfterSelection.isNotNull() && !endAfterSelection.deepEquivalent().anchorNode()->inDocument())
209 break;
210
211 if (endOfNextParagraph.isNotNull() && !endOfNextParagraph.deepEquivalent().anchorNode()->inDocument()) {
212 endOfCurrentParagraph = endingSelection().end();
213 endOfNextParagraph = endOfParagraph(endOfCurrentParagraph.next());
214 }
215 endOfCurrentParagraph = endOfNextParagraph;
216 }
217 }
218
formatSelection(const VisiblePosition & startOfSelection,const VisiblePosition & endOfSelection)219 void IndentOutdentCommand::formatSelection(const VisiblePosition& startOfSelection, const VisiblePosition& endOfSelection)
220 {
221 if (m_typeOfAction == Indent)
222 ApplyBlockElementCommand::formatSelection(startOfSelection, endOfSelection);
223 else
224 outdentRegion(startOfSelection, endOfSelection);
225 }
226
formatRange(const Position & start,const Position & end,const Position &,RefPtr<Element> & blockquoteForNextIndent)227 void IndentOutdentCommand::formatRange(const Position& start, const Position& end, const Position&, RefPtr<Element>& blockquoteForNextIndent)
228 {
229 if (tryIndentingAsListItem(start, end))
230 blockquoteForNextIndent = 0;
231 else
232 indentIntoBlockquote(start, end, blockquoteForNextIndent);
233 }
234
235 }
236