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      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 
     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 
     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 
     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 
     83 PassRefPtr<RenderStyle> PseudoElement::customStyleForRenderer()
     84 {
     85     return parentOrShadowHostElement()->renderer()->getCachedPseudoStyle(m_pseudoId);
     86 }
     87 
     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 
    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 
    128 bool PseudoElement::rendererIsNeeded(const RenderStyle& style)
    129 {
    130     return pseudoElementRendererIsNeeded(&style);
    131 }
    132 
    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