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
39namespace blink {
40
41V8EventListener::V8EventListener(v8::Local<v8::Object> listener, bool isAttribute, ScriptState* scriptState)
42    : V8AbstractEventListener(isAttribute, scriptState)
43{
44    setListenerObject(listener);
45}
46
47v8::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
70v8::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