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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 #include "wtf/Forward.h"
     33 
     34 namespace WebCore {
     35 
     36 class PseudoElement FINAL : public Element {
     37 public:
     38     static PassRefPtr<PseudoElement> create(Element* parent, PseudoId pseudoId)
     39     {
     40         return adoptRef(new PseudoElement(parent, pseudoId));
     41     }
     42     ~PseudoElement();
     43 
     44     virtual PassRefPtr<RenderStyle> customStyleForRenderer() OVERRIDE;
     45     virtual void attach(const AttachContext& = AttachContext()) OVERRIDE;
     46     virtual bool rendererIsNeeded(const NodeRenderingContext&) OVERRIDE;
     47 
     48     // As per http://dev.w3.org/csswg/css3-regions/#flow-into, pseudo-elements such as ::first-line, ::first-letter, ::before or ::after
     49     // cannot be directly collected into a named flow.
     50     virtual bool shouldMoveToFlowThread(RenderStyle*) const OVERRIDE { return false; }
     51 
     52     virtual bool canStartSelection() const OVERRIDE { return false; }
     53     virtual bool canContainRangeEndPoint() const OVERRIDE { return false; }
     54 
     55     static String pseudoElementNameForEvents(PseudoId);
     56 
     57 private:
     58     PseudoElement(Element*, PseudoId);
     59 
     60     virtual void didRecalcStyle(StyleChange) OVERRIDE;
     61     virtual PseudoId customPseudoId() const OVERRIDE { return m_pseudoId; }
     62 
     63     PseudoId m_pseudoId;
     64 };
     65 
     66 const QualifiedName& pseudoElementTagName();
     67 
     68 inline bool pseudoElementRendererIsNeeded(const RenderStyle* style)
     69 {
     70     return style && style->display() != NONE && (style->styleType() == BACKDROP || style->contentData() || !style->regionThread().isEmpty());
     71 }
     72 
     73 } // namespace
     74 
     75 #endif
     76