1 /* 2 * Copyright (C) 2009 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 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this 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 V8EventListenerList_h 32 #define V8EventListenerList_h 33 34 #include "bindings/core/v8/V8Binding.h" 35 #include "bindings/core/v8/V8EventListener.h" 36 #include <v8.h> 37 38 namespace blink { 39 40 class LocalFrame; 41 42 enum ListenerLookupType { 43 ListenerFindOnly, 44 ListenerFindOrCreate, 45 }; 46 47 // This is a container for V8EventListener objects that uses hidden properties of v8::Object to speed up lookups. 48 class V8EventListenerList { 49 public: 50 static PassRefPtr<V8EventListener> findWrapper(v8::Local<v8::Value> value, ScriptState* scriptState) 51 { 52 ASSERT(scriptState->isolate()->InContext()); 53 if (!value->IsObject()) 54 return nullptr; 55 56 v8::Handle<v8::String> wrapperProperty = getHiddenProperty(false, scriptState->isolate()); 57 return doFindWrapper(v8::Local<v8::Object>::Cast(value), wrapperProperty, scriptState); 58 } 59 60 template<typename WrapperType> 61 static PassRefPtr<V8EventListener> findOrCreateWrapper(v8::Local<v8::Value>, bool isAttribute, ScriptState*); 62 63 static void clearWrapper(v8::Handle<v8::Object> listenerObject, bool isAttribute, v8::Isolate* isolate) 64 { 65 v8::Handle<v8::String> wrapperProperty = getHiddenProperty(isAttribute, isolate); 66 listenerObject->DeleteHiddenValue(wrapperProperty); 67 } 68 69 static PassRefPtr<EventListener> getEventListener(ScriptState*, v8::Local<v8::Value>, bool isAttribute, ListenerLookupType); 70 71 private: 72 static V8EventListener* doFindWrapper(v8::Local<v8::Object> object, v8::Handle<v8::String> wrapperProperty, ScriptState* scriptState) 73 { 74 v8::HandleScope scope(scriptState->isolate()); 75 ASSERT(scriptState->isolate()->InContext()); 76 v8::Local<v8::Value> listener = object->GetHiddenValue(wrapperProperty); 77 if (listener.IsEmpty()) 78 return 0; 79 return static_cast<V8EventListener*>(v8::External::Cast(*listener)->Value()); 80 } 81 82 static inline v8::Handle<v8::String> getHiddenProperty(bool isAttribute, v8::Isolate* isolate) 83 { 84 return isAttribute ? v8AtomicString(isolate, "attributeListener") : v8AtomicString(isolate, "listener"); 85 } 86 }; 87 88 template<typename WrapperType> 89 PassRefPtr<V8EventListener> V8EventListenerList::findOrCreateWrapper(v8::Local<v8::Value> value, bool isAttribute, ScriptState* scriptState) 90 { 91 v8::Isolate* isolate = scriptState->isolate(); 92 ASSERT(isolate->InContext()); 93 if (!value->IsObject() 94 // Non-callable attribute setter input is treated as null (no wrapper) 95 || (isAttribute && !value->IsFunction())) 96 return nullptr; 97 98 v8::Local<v8::Object> object = v8::Local<v8::Object>::Cast(value); 99 v8::Handle<v8::String> wrapperProperty = getHiddenProperty(isAttribute, isolate); 100 101 V8EventListener* wrapper = doFindWrapper(object, wrapperProperty, scriptState); 102 if (wrapper) 103 return wrapper; 104 105 RefPtr<V8EventListener> wrapperPtr = WrapperType::create(object, isAttribute, scriptState); 106 if (wrapperPtr) 107 object->SetHiddenValue(wrapperProperty, v8::External::New(isolate, wrapperPtr.get())); 108 109 return wrapperPtr; 110 } 111 112 } // namespace blink 113 114 #endif // V8EventListenerList_h 115