1 /* 2 * Copyright (C) 2011 Adobe Systems Incorporated. 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 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above 9 * copyright notice, this list of conditions and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above 12 * copyright notice, this list of conditions and the following 13 * disclaimer in the documentation and/or other materials 14 * provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "AS IS" AND ANY 17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE 20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 21 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 25 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 26 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef NamedFlow_h 31 #define NamedFlow_h 32 33 #include "bindings/v8/ScriptWrappable.h" 34 #include "core/dom/EventTarget.h" 35 #include "wtf/RefCounted.h" 36 #include "wtf/RefPtr.h" 37 #include "wtf/text/AtomicString.h" 38 39 namespace WebCore { 40 41 class Document; 42 class NamedFlowCollection; 43 class Node; 44 class NodeList; 45 class RenderNamedFlowThread; 46 class ScriptExecutionContext; 47 48 class NamedFlow : public RefCounted<NamedFlow>, public ScriptWrappable, public EventTarget { 49 public: 50 static PassRefPtr<NamedFlow> create(PassRefPtr<NamedFlowCollection> manager, const AtomicString& flowThreadName); 51 52 ~NamedFlow(); 53 54 const AtomicString& name() const; 55 bool overset() const; 56 int firstEmptyRegionIndex() const; 57 PassRefPtr<NodeList> getRegionsByContent(Node*); 58 PassRefPtr<NodeList> getRegions(); 59 PassRefPtr<NodeList> getContent(); 60 61 using RefCounted<NamedFlow>::ref; 62 using RefCounted<NamedFlow>::deref; 63 64 virtual const AtomicString& interfaceName() const; 65 virtual ScriptExecutionContext* scriptExecutionContext() const; 66 67 // This function is called from the JS binding code to determine if the NamedFlow object is reachable or not. 68 // If the object has listeners, the object should only be discarded if the parent Document is not reachable. 69 Node* ownerNode() const; 70 71 void setRenderer(RenderNamedFlowThread* parentFlowThread); 72 73 enum FlowState { 74 FlowStateCreated, 75 FlowStateNull 76 }; 77 78 FlowState flowState() const { return m_parentFlowThread ? FlowStateCreated : FlowStateNull; } 79 80 void dispatchRegionLayoutUpdateEvent(); 81 void dispatchRegionOversetChangeEvent(); 82 83 private: 84 NamedFlow(PassRefPtr<NamedFlowCollection>, const AtomicString&); 85 86 // EventTarget implementation. 87 virtual void refEventTarget() { ref(); } 88 virtual void derefEventTarget() { deref(); } 89 90 virtual EventTargetData* eventTargetData() OVERRIDE; 91 virtual EventTargetData* ensureEventTargetData() OVERRIDE; 92 93 // The name of the flow thread as specified in CSS. 94 AtomicString m_flowThreadName; 95 96 RefPtr<NamedFlowCollection> m_flowManager; 97 RenderNamedFlowThread* m_parentFlowThread; 98 99 EventTargetData m_eventTargetData; 100 }; 101 102 } 103 104 #endif 105