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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/dom/NodeRenderingContext.h"
     31 #include "core/rendering/RenderObject.h"
     32 #include "core/rendering/RenderQuote.h"
     33 #include "core/rendering/style/ContentData.h"
     34 
     35 namespace WebCore {
     36 
     37 const QualifiedName& pseudoElementTagName()
     38 {
     39     DEFINE_STATIC_LOCAL(QualifiedName, name, (nullAtom, "<pseudo>", nullAtom));
     40     return name;
     41 }
     42 
     43 String PseudoElement::pseudoElementNameForEvents(PseudoId pseudoId)
     44 {
     45     DEFINE_STATIC_LOCAL(const String, after, ("::after"));
     46     DEFINE_STATIC_LOCAL(const String, before, ("::before"));
     47     switch (pseudoId) {
     48     case AFTER:
     49         return after;
     50     case BEFORE:
     51         return before;
     52     default:
     53         return emptyString();
     54     }
     55 }
     56 
     57 PseudoElement::PseudoElement(Element* parent, PseudoId pseudoId)
     58     : Element(pseudoElementTagName(), parent->document(), CreatePseudoElement)
     59     , m_pseudoId(pseudoId)
     60 {
     61     ASSERT(pseudoId != NOPSEUDO);
     62     setParentOrShadowHostNode(parent);
     63     setHasCustomStyleCallbacks();
     64 }
     65 
     66 PseudoElement::~PseudoElement()
     67 {
     68 }
     69 
     70 PassRefPtr<RenderStyle> PseudoElement::customStyleForRenderer()
     71 {
     72     return parentOrShadowHostElement()->renderer()->getCachedPseudoStyle(m_pseudoId);
     73 }
     74 
     75 void PseudoElement::attach(const AttachContext& context)
     76 {
     77     ASSERT(!renderer());
     78 
     79     Element::attach(context);
     80 
     81     RenderObject* renderer = this->renderer();
     82     if (!renderer)
     83         return;
     84     RenderStyle* style = renderer->style();
     85     if (!style->regionThread().isEmpty())
     86         return;
     87     if (style->styleType() != BEFORE && style->styleType() != AFTER)
     88         return;
     89     ASSERT(style->contentData());
     90 
     91     for (const ContentData* content = style->contentData(); content; content = content->next()) {
     92         RenderObject* child = content->createRenderer(document(), style);
     93         if (renderer->isChildAllowed(child, style)) {
     94             renderer->addChild(child);
     95             if (child->isQuote())
     96                 toRenderQuote(child)->attachQuote();
     97         } else
     98             child->destroy();
     99     }
    100 }
    101 
    102 bool PseudoElement::rendererIsNeeded(const NodeRenderingContext& context)
    103 {
    104     return pseudoElementRendererIsNeeded(context.style());
    105 }
    106 
    107 void PseudoElement::didRecalcStyle(StyleChange)
    108 {
    109     if (!renderer())
    110         return;
    111 
    112     // The renderers inside pseudo elements are anonymous so they don't get notified of recalcStyle and must have
    113     // the style propagated downward manually similar to RenderObject::propagateStyleToAnonymousChildren.
    114     RenderObject* renderer = this->renderer();
    115     for (RenderObject* child = renderer->nextInPreOrder(renderer); child; child = child->nextInPreOrder(renderer)) {
    116         // We only manage the style for the generated content items.
    117         if (!child->isText() && !child->isQuote() && !child->isImage())
    118             continue;
    119 
    120         // The style for the RenderTextFragment for first letter is managed by an enclosing block, not by us.
    121         if (child->style()->styleType() == FIRST_LETTER)
    122             continue;
    123 
    124         child->setPseudoStyle(renderer->style());
    125     }
    126 }
    127 
    128 } // namespace
    129