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/v8/V8EventListener.h"
33
34 #include "bindings/v8/ScriptController.h"
35 #include "bindings/v8/V8Binding.h"
36 #include "core/dom/Document.h"
37 #include "core/frame/Frame.h"
38
39 namespace WebCore {
40
V8EventListener(v8::Local<v8::Object> listener,bool isAttribute,v8::Isolate * isolate)41 V8EventListener::V8EventListener(v8::Local<v8::Object> listener, bool isAttribute, v8::Isolate* isolate)
42 : V8AbstractEventListener(isAttribute, DOMWrapperWorld::current(), isolate)
43 {
44 setListenerObject(listener);
45 }
46
getListenerFunction(ExecutionContext * context)47 v8::Local<v8::Function> V8EventListener::getListenerFunction(ExecutionContext* context)
48 {
49 v8::Local<v8::Object> listener = getListenerObject(context);
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
callListenerFunction(ExecutionContext * context,v8::Handle<v8::Value> jsEvent,Event * event)70 v8::Local<v8::Value> V8EventListener::callListenerFunction(ExecutionContext* context, v8::Handle<v8::Value> jsEvent, Event* event)
71 {
72
73 v8::Local<v8::Function> handlerFunction = getListenerFunction(context);
74 v8::Local<v8::Object> receiver = getReceiverObject(context, event);
75 if (handlerFunction.IsEmpty() || receiver.IsEmpty())
76 return v8::Local<v8::Value>();
77
78 // FIXME: Can |context| be 0 here?
79 if (!context)
80 return v8::Local<v8::Value>();
81
82 if (!context->isDocument())
83 return v8::Local<v8::Value>();
84
85 Frame* frame = toDocument(context)->frame();
86 if (!frame)
87 return v8::Local<v8::Value>();
88
89 if (!frame->script().canExecuteScripts(AboutToExecuteScript))
90 return v8::Local<v8::Value>();
91
92 v8::Handle<v8::Value> parameters[1] = { jsEvent };
93 return frame->script().callFunction(handlerFunction, receiver, WTF_ARRAY_LENGTH(parameters), parameters);
94 }
95
96 } // namespace WebCore
97