1 /* 2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org) 3 * (C) 1999 Antti Koivisto (koivisto@kde.org) 4 * (C) 2001 Dirk Mueller (mueller@kde.org) 5 * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved. 6 * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org) 7 * (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org> 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 19 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 22 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 24 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 25 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 26 * 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 32 #ifndef EventTarget_h 33 #define EventTarget_h 34 35 #include <wtf/Forward.h> 36 37 namespace WebCore { 38 39 class AbstractWorker; 40 class AtomicString; 41 class DedicatedWorkerContext; 42 class DOMApplicationCache; 43 class DOMWindow; 44 class Event; 45 class EventListener; 46 class MessagePort; 47 class Node; 48 class SVGElementInstance; 49 class ScriptExecutionContext; 50 class SharedWorker; 51 class SharedWorkerContext; 52 class Worker; 53 class XMLHttpRequest; 54 class XMLHttpRequestUpload; 55 56 typedef int ExceptionCode; 57 58 class EventTarget { 59 public: 60 virtual MessagePort* toMessagePort(); 61 virtual Node* toNode(); 62 virtual DOMWindow* toDOMWindow(); 63 virtual XMLHttpRequest* toXMLHttpRequest(); 64 virtual XMLHttpRequestUpload* toXMLHttpRequestUpload(); 65 #if ENABLE(OFFLINE_WEB_APPLICATIONS) 66 virtual DOMApplicationCache* toDOMApplicationCache(); 67 #endif 68 #if ENABLE(SVG) 69 virtual SVGElementInstance* toSVGElementInstance(); 70 #endif 71 #if ENABLE(WORKERS) 72 virtual Worker* toWorker(); 73 virtual DedicatedWorkerContext* toDedicatedWorkerContext(); 74 #endif 75 76 #if ENABLE(SHARED_WORKERS) 77 virtual SharedWorker* toSharedWorker(); 78 virtual SharedWorkerContext* toSharedWorkerContext(); 79 #endif 80 81 virtual ScriptExecutionContext* scriptExecutionContext() const = 0; 82 83 virtual void addEventListener(const AtomicString& eventType, PassRefPtr<EventListener>, bool useCapture) = 0; 84 virtual void removeEventListener(const AtomicString& eventType, EventListener*, bool useCapture) = 0; 85 virtual bool dispatchEvent(PassRefPtr<Event>, ExceptionCode&) = 0; 86 ref()87 void ref() { refEventTarget(); } deref()88 void deref() { derefEventTarget(); } 89 90 // Handlers to do/undo actions on the target node before an event is dispatched to it and after the event 91 // has been dispatched. The data pointer is handed back by the preDispatch and passed to postDispatch. preDispatchEventHandler(Event *)92 virtual void* preDispatchEventHandler(Event*) { return 0; } postDispatchEventHandler(Event *,void *)93 virtual void postDispatchEventHandler(Event*, void* /*dataFromPreDispatch*/) { } 94 95 protected: 96 virtual ~EventTarget(); 97 98 private: 99 virtual void refEventTarget() = 0; 100 virtual void derefEventTarget() = 0; 101 }; 102 103 void forbidEventDispatch(); 104 void allowEventDispatch(); 105 106 #ifndef NDEBUG 107 bool eventDispatchForbidden(); 108 #else forbidEventDispatch()109 inline void forbidEventDispatch() { } allowEventDispatch()110 inline void allowEventDispatch() { } 111 #endif 112 113 } 114 115 #endif 116