1 /*
2 * Copyright (C) 2006 Apple Computer, 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 (INCLUDING, 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 "Element.h"
28 #include "FormatBlockCommand.h"
29 #include "Document.h"
30 #include "htmlediting.h"
31 #include "HTMLElement.h"
32 #include "HTMLNames.h"
33 #include "visible_units.h"
34
35 namespace WebCore {
36
37 using namespace HTMLNames;
38
FormatBlockCommand(Document * document,const AtomicString & tagName)39 FormatBlockCommand::FormatBlockCommand(Document* document, const AtomicString& tagName)
40 : CompositeEditCommand(document), m_tagName(tagName)
41 {
42 }
43
modifyRange()44 bool FormatBlockCommand::modifyRange()
45 {
46 ASSERT(endingSelection().isRange());
47 VisiblePosition visibleStart = endingSelection().visibleStart();
48 VisiblePosition visibleEnd = endingSelection().visibleEnd();
49 VisiblePosition startOfLastParagraph = startOfParagraph(visibleEnd);
50
51 if (startOfParagraph(visibleStart) == startOfLastParagraph)
52 return false;
53
54 setEndingSelection(visibleStart);
55 doApply();
56 visibleStart = endingSelection().visibleStart();
57 VisiblePosition nextParagraph = endOfParagraph(visibleStart).next();
58 while (nextParagraph.isNotNull() && nextParagraph != startOfLastParagraph) {
59 setEndingSelection(nextParagraph);
60 doApply();
61 nextParagraph = endOfParagraph(endingSelection().visibleStart()).next();
62 }
63 setEndingSelection(visibleEnd);
64 doApply();
65 visibleEnd = endingSelection().visibleEnd();
66 setEndingSelection(VisibleSelection(visibleStart.deepEquivalent(), visibleEnd.deepEquivalent(), DOWNSTREAM));
67
68 return true;
69 }
70
doApply()71 void FormatBlockCommand::doApply()
72 {
73 if (endingSelection().isNone())
74 return;
75
76 if (!endingSelection().rootEditableElement())
77 return;
78
79 VisiblePosition visibleEnd = endingSelection().visibleEnd();
80 VisiblePosition visibleStart = endingSelection().visibleStart();
81 // When a selection ends at the start of a paragraph, we rarely paint
82 // the selection gap before that paragraph, because there often is no gap.
83 // In a case like this, it's not obvious to the user that the selection
84 // ends "inside" that paragraph, so it would be confusing if FormatBlock
85 // operated on that paragraph.
86 // FIXME: We paint the gap before some paragraphs that are indented with left
87 // margin/padding, but not others. We should make the gap painting more consistent and
88 // then use a left margin/padding rule here.
89 if (visibleEnd != visibleStart && isStartOfParagraph(visibleEnd))
90 setEndingSelection(VisibleSelection(visibleStart, visibleEnd.previous(true)));
91
92 if (endingSelection().isRange() && modifyRange())
93 return;
94
95 ExceptionCode ec;
96 String localName, prefix;
97 if (!Document::parseQualifiedName(m_tagName, prefix, localName, ec))
98 return;
99 QualifiedName qTypeOfBlock(prefix, localName, xhtmlNamespaceURI);
100
101 Node* refNode = enclosingBlockFlowElement(endingSelection().visibleStart());
102 if (refNode->hasTagName(qTypeOfBlock))
103 // We're already in a block with the format we want, so we don't have to do anything
104 return;
105
106 VisiblePosition paragraphStart = startOfParagraph(endingSelection().visibleStart());
107 VisiblePosition paragraphEnd = endOfParagraph(endingSelection().visibleStart());
108 VisiblePosition blockStart = startOfBlock(endingSelection().visibleStart());
109 VisiblePosition blockEnd = endOfBlock(endingSelection().visibleStart());
110 RefPtr<Element> blockNode = createHTMLElement(document(), m_tagName);
111 RefPtr<Element> placeholder = createBreakElement(document());
112
113 Node* root = endingSelection().start().node()->rootEditableElement();
114 if (validBlockTag(refNode->nodeName().lower()) &&
115 paragraphStart == blockStart && paragraphEnd == blockEnd &&
116 refNode != root && !root->isDescendantOf(refNode))
117 // Already in a valid block tag that only contains the current paragraph, so we can swap with the new tag
118 insertNodeBefore(blockNode, refNode);
119 else {
120 // Avoid inserting inside inline elements that surround paragraphStart with upstream().
121 // This is only to avoid creating bloated markup.
122 insertNodeAt(blockNode, paragraphStart.deepEquivalent().upstream());
123 }
124 appendNode(placeholder, blockNode);
125
126 VisiblePosition destination(Position(placeholder.get(), 0));
127 if (paragraphStart == paragraphEnd && !lineBreakExistsAtVisiblePosition(paragraphStart)) {
128 setEndingSelection(destination);
129 return;
130 }
131 moveParagraph(paragraphStart, paragraphEnd, destination, true, false);
132 }
133
134 }
135