1 /* 2 * Copyright (C) 2013 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 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * 3. Neither the name of Google Inc. nor the names of its contributors 15 * may be used to endorse or promote products derived from this 16 * software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef CustomElementObserver_h 32 #define CustomElementObserver_h 33 34 #include "wtf/HashMap.h" 35 36 namespace WebCore { 37 38 class Element; 39 40 class CustomElementObserver { 41 public: CustomElementObserver()42 CustomElementObserver() { } ~CustomElementObserver()43 virtual ~CustomElementObserver() { } 44 45 // API for CustomElement to kick off notifications 46 47 static void notifyElementDidFinishParsingChildren(Element*); 48 static void notifyElementWasDestroyed(Element*); 49 50 protected: 51 void observe(Element*); 52 void unobserve(Element*); 53 54 virtual void elementDidFinishParsingChildren(Element*) = 0; elementWasDestroyed(Element * element)55 virtual void elementWasDestroyed(Element* element) { unobserve(element); } 56 57 private: 58 // Maps elements to the observer watching them. At most one per 59 // element at a time. 60 typedef HashMap<Element*, CustomElementObserver*> ElementObserverMap; 61 static ElementObserverMap& elementObservers(); 62 }; 63 64 } 65 66 #endif // CustomElementObserver_h 67