1 /*
2 * Copyright (C) 2012 Google 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 are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Neither the name of Google Inc. nor the names of its
11 * contributors may be used to endorse or promote products derived from
12 * this software without specific prior written permission.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
15 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
16 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
17 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
18 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
19 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
20 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include "config.h"
28 #include "core/dom/PseudoElement.h"
29
30 #include "core/inspector/InspectorInstrumentation.h"
31 #include "core/rendering/RenderObject.h"
32 #include "core/rendering/RenderQuote.h"
33 #include "core/rendering/style/ContentData.h"
34
35 namespace blink {
36
pseudoElementTagName(PseudoId pseudoId)37 const QualifiedName& pseudoElementTagName(PseudoId pseudoId)
38 {
39 switch (pseudoId) {
40 case AFTER: {
41 DEFINE_STATIC_LOCAL(QualifiedName, after, (nullAtom, "<pseudo:after>", nullAtom));
42 return after;
43 }
44 case BEFORE: {
45 DEFINE_STATIC_LOCAL(QualifiedName, before, (nullAtom, "<pseudo:before>", nullAtom));
46 return before;
47 }
48 case BACKDROP: {
49 DEFINE_STATIC_LOCAL(QualifiedName, backdrop, (nullAtom, "<pseudo:backdrop>", nullAtom));
50 return backdrop;
51 }
52 default: {
53 ASSERT_NOT_REACHED();
54 }
55 }
56 DEFINE_STATIC_LOCAL(QualifiedName, name, (nullAtom, "<pseudo>", nullAtom));
57 return name;
58 }
59
pseudoElementNameForEvents(PseudoId pseudoId)60 String PseudoElement::pseudoElementNameForEvents(PseudoId pseudoId)
61 {
62 DEFINE_STATIC_LOCAL(const String, after, ("::after"));
63 DEFINE_STATIC_LOCAL(const String, before, ("::before"));
64 switch (pseudoId) {
65 case AFTER:
66 return after;
67 case BEFORE:
68 return before;
69 default:
70 return emptyString();
71 }
72 }
73
PseudoElement(Element * parent,PseudoId pseudoId)74 PseudoElement::PseudoElement(Element* parent, PseudoId pseudoId)
75 : Element(pseudoElementTagName(pseudoId), &parent->document(), CreateElement)
76 , m_pseudoId(pseudoId)
77 {
78 ASSERT(pseudoId != NOPSEUDO);
79 setParentOrShadowHostNode(parent);
80 setHasCustomStyleCallbacks();
81 }
82
customStyleForRenderer()83 PassRefPtr<RenderStyle> PseudoElement::customStyleForRenderer()
84 {
85 return parentOrShadowHostElement()->renderer()->getCachedPseudoStyle(m_pseudoId);
86 }
87
dispose()88 void PseudoElement::dispose()
89 {
90 ASSERT(parentOrShadowHostElement());
91
92 InspectorInstrumentation::pseudoElementDestroyed(this);
93
94 ASSERT(!nextSibling());
95 ASSERT(!previousSibling());
96
97 detach();
98 RefPtrWillBeRawPtr<Element> parent = parentOrShadowHostElement();
99 setParentOrShadowHostNode(0);
100 removedFrom(parent.get());
101 }
102
attach(const AttachContext & context)103 void PseudoElement::attach(const AttachContext& context)
104 {
105 ASSERT(!renderer());
106
107 Element::attach(context);
108
109 RenderObject* renderer = this->renderer();
110 if (!renderer)
111 return;
112 RenderStyle* style = renderer->style();
113 if (style->styleType() != BEFORE && style->styleType() != AFTER)
114 return;
115 ASSERT(style->contentData());
116
117 for (const ContentData* content = style->contentData(); content; content = content->next()) {
118 RenderObject* child = content->createRenderer(document(), style);
119 if (renderer->isChildAllowed(child, style)) {
120 renderer->addChild(child);
121 if (child->isQuote())
122 toRenderQuote(child)->attachQuote();
123 } else
124 child->destroy();
125 }
126 }
127
rendererIsNeeded(const RenderStyle & style)128 bool PseudoElement::rendererIsNeeded(const RenderStyle& style)
129 {
130 return pseudoElementRendererIsNeeded(&style);
131 }
132
didRecalcStyle(StyleRecalcChange)133 void PseudoElement::didRecalcStyle(StyleRecalcChange)
134 {
135 if (!renderer())
136 return;
137
138 // The renderers inside pseudo elements are anonymous so they don't get notified of recalcStyle and must have
139 // the style propagated downward manually similar to RenderObject::propagateStyleToAnonymousChildren.
140 RenderObject* renderer = this->renderer();
141 for (RenderObject* child = renderer->nextInPreOrder(renderer); child; child = child->nextInPreOrder(renderer)) {
142 // We only manage the style for the generated content items.
143 if (!child->isText() && !child->isQuote() && !child->isImage())
144 continue;
145
146 // The style for the RenderTextFragment for first letter is managed by an enclosing block, not by us.
147 if (child->style()->styleType() == FIRST_LETTER)
148 continue;
149
150 child->setPseudoStyle(renderer->style());
151 }
152 }
153
154 } // namespace
155