1 /* 2 * Copyright (C) 2006, 2007, 2008, 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 #include "config.h" 32 #include "bindings/core/v8/V8EventListener.h" 33 34 #include "bindings/core/v8/ScriptController.h" 35 #include "bindings/core/v8/V8Binding.h" 36 #include "core/dom/Document.h" 37 #include "core/frame/LocalFrame.h" 38 39 namespace blink { 40 41 V8EventListener::V8EventListener(v8::Local<v8::Object> listener, bool isAttribute, ScriptState* scriptState) 42 : V8AbstractEventListener(isAttribute, scriptState) 43 { 44 setListenerObject(listener); 45 } 46 47 v8::Local<v8::Function> V8EventListener::getListenerFunction(ExecutionContext*) 48 { 49 v8::Local<v8::Object> listener = getListenerObject(scriptState()->executionContext()); 50 51 // Has the listener been disposed? 52 if (listener.IsEmpty()) 53 return v8::Local<v8::Function>(); 54 55 if (listener->IsFunction()) 56 return v8::Local<v8::Function>::Cast(listener); 57 58 if (listener->IsObject()) { 59 ASSERT_WITH_MESSAGE(!isAttribute(), "EventHandler attributes should only accept JS Functions as input."); 60 v8::Local<v8::Value> property = listener->Get(v8AtomicString(isolate(), "handleEvent")); 61 // Check that no exceptions were thrown when getting the 62 // handleEvent property and that the value is a function. 63 if (!property.IsEmpty() && property->IsFunction()) 64 return v8::Local<v8::Function>::Cast(property); 65 } 66 67 return v8::Local<v8::Function>(); 68 } 69 70 v8::Local<v8::Value> V8EventListener::callListenerFunction(v8::Handle<v8::Value> jsEvent, Event* event) 71 { 72 v8::Local<v8::Function> handlerFunction = getListenerFunction(scriptState()->executionContext()); 73 v8::Local<v8::Object> receiver = getReceiverObject(event); 74 if (handlerFunction.IsEmpty() || receiver.IsEmpty()) 75 return v8::Local<v8::Value>(); 76 77 if (!scriptState()->executionContext()->isDocument()) 78 return v8::Local<v8::Value>(); 79 80 LocalFrame* frame = toDocument(scriptState()->executionContext())->frame(); 81 if (!frame) 82 return v8::Local<v8::Value>(); 83 84 if (!frame->script().canExecuteScripts(AboutToExecuteScript)) 85 return v8::Local<v8::Value>(); 86 87 v8::Handle<v8::Value> parameters[1] = { jsEvent }; 88 return frame->script().callFunction(handlerFunction, receiver, WTF_ARRAY_LENGTH(parameters), parameters); 89 } 90 91 } // namespace blink 92