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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 #ifndef PseudoElement_h
     28 #define PseudoElement_h
     29 
     30 #include "core/dom/Element.h"
     31 #include "core/rendering/style/RenderStyle.h"
     32 
     33 namespace blink {
     34 
     35 class PseudoElement FINAL : public Element {
     36 public:
     37     static PassRefPtrWillBeRawPtr<PseudoElement> create(Element* parent, PseudoId pseudoId)
     38     {
     39         return adoptRefWillBeNoop(new PseudoElement(parent, pseudoId));
     40     }
     41 
     42     virtual PassRefPtr<RenderStyle> customStyleForRenderer() OVERRIDE;
     43     virtual void attach(const AttachContext& = AttachContext()) OVERRIDE;
     44     virtual bool rendererIsNeeded(const RenderStyle&) OVERRIDE;
     45 
     46     virtual bool canStartSelection() const OVERRIDE { return false; }
     47     virtual bool canContainRangeEndPoint() const OVERRIDE { return false; }
     48     virtual PseudoId pseudoId() const OVERRIDE { return m_pseudoId; }
     49 
     50     static String pseudoElementNameForEvents(PseudoId);
     51 
     52     void dispose();
     53 
     54 private:
     55     PseudoElement(Element*, PseudoId);
     56 
     57     virtual void didRecalcStyle(StyleRecalcChange) OVERRIDE;
     58 
     59     PseudoId m_pseudoId;
     60 };
     61 
     62 const QualifiedName& pseudoElementTagName();
     63 
     64 inline bool pseudoElementRendererIsNeeded(const RenderStyle* style)
     65 {
     66     return style && style->display() != NONE && (style->styleType() == BACKDROP || style->contentData());
     67 }
     68 
     69 DEFINE_ELEMENT_TYPE_CASTS(PseudoElement, isPseudoElement());
     70 
     71 } // namespace
     72 
     73 #endif
     74