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