third_party/WebKit/Source/core/dom/PseudoElement.h

   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/CoreExport.h"
  31 #include "core/dom/Element.h"
  32 #include "core/style/ComputedStyle.h"
  33
  34 namespace blink {
  35
  36 class CORE_EXPORT PseudoElement : public Element {
  37 public:
  38     static PassRefPtrWillBeRawPtr<PseudoElement> create(Element* parent, PseudoId);
  39
  40     PassRefPtr<ComputedStyle> customStyleForLayoutObject() override;
  41     void attach(const AttachContext& = AttachContext()) override;
  42     bool layoutObjectIsNeeded(const ComputedStyle&) override;
  43
  44     bool canStartSelection() const override { return false; }
  45     bool canContainRangeEndPoint() const override { return false; }
  46     PseudoId pseudoId() const override { return m_pseudoId; }
  47
  48     static String pseudoElementNameForEvents(PseudoId);
  49
  50     Node* findAssociatedNode() const;
  51
  52     virtual void dispose();
  53
  54 protected:
  55     PseudoElement(Element*, PseudoId);
  56
  57 private:
  58     void didRecalcStyle(StyleRecalcChange) override;
  59
  60     PseudoId m_pseudoId;
  61 };
  62
  63 const QualifiedName& pseudoElementTagName();
  64
  65 inline bool pseudoElementLayoutObjectIsNeeded(const ComputedStyle* style)
  66 {
  67     if (!style)
  68         return false;
  69     if (style->display() == NONE)
  70         return false;
  71     if (style->styleType() == FIRST_LETTER || style->styleType() == BACKDROP)
  72         return true;
  73     return style->contentData();
  74 }
  75
  76 DEFINE_ELEMENT_TYPE_CASTS(PseudoElement, isPseudoElement());
  77
  78 } // namespace
  79
  80 #endif