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/*
* Copyright (C) 2006, 2007, 2008, 2009 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "V8AbstractEventListener.h"
#include "DateExtension.h"
#include "Document.h"
#include "Event.h"
#include "Frame.h"
#include "V8Binding.h"
#include "V8Event.h"
#include "V8EventListenerList.h"
#include "V8HiddenPropertyName.h"
#include "V8Proxy.h"
#include "V8Utilities.h"
#include "WorkerContext.h"
#include "WorkerContextExecutionProxy.h"
namespace WebCore {
static void weakEventListenerCallback(v8::Persistent<v8::Value>, void* parameter)
{
V8AbstractEventListener* listener = static_cast<V8AbstractEventListener*>(parameter);
listener->disposeListenerObject();
}
V8AbstractEventListener::V8AbstractEventListener(bool isAttribute, const WorldContextHandle& worldContext)
: EventListener(JSEventListenerType)
, m_isWeak(true)
, m_isAttribute(isAttribute)
, m_worldContext(worldContext)
{
}
V8AbstractEventListener::~V8AbstractEventListener()
{
if (!m_listener.IsEmpty()) {
v8::HandleScope scope;
v8::Local<v8::Object> listener = v8::Local<v8::Object>::New(m_listener);
V8EventListenerList::clearWrapper(listener, m_isAttribute);
}
disposeListenerObject();
}
void V8AbstractEventListener::handleEvent(ScriptExecutionContext* context, Event* event)
{
ASSERT(event);
// The callback function on XMLHttpRequest can clear the event listener and destroys 'this' object. Keep a local reference to it.
// See issue 889829.
RefPtr<V8AbstractEventListener> protect(this);
v8::HandleScope handleScope;
v8::Local<v8::Context> v8Context = toV8Context(context, worldContext());
if (v8Context.IsEmpty())
return;
// Enter the V8 context in which to perform the event handling.
v8::Context::Scope scope(v8Context);
// Get the V8 wrapper for the event object.
v8::Handle<v8::Value> jsEvent = toV8(event);
ASSERT(!jsEvent.IsEmpty());
invokeEventHandler(context, event, jsEvent);
}
void V8AbstractEventListener::disposeListenerObject()
{
if (!m_listener.IsEmpty()) {
#ifndef NDEBUG
V8GCController::unregisterGlobalHandle(this, m_listener);
#endif
m_listener.Dispose();
m_listener.Clear();
}
}
void V8AbstractEventListener::setListenerObject(v8::Handle<v8::Object> listener)
{
disposeListenerObject();
m_listener = v8::Persistent<v8::Object>::New(listener);
#ifndef NDEBUG
V8GCController::registerGlobalHandle(EVENT_LISTENER, this, m_listener);
#endif
if (m_isWeak)
m_listener.MakeWeak(this, &weakEventListenerCallback);
}
void V8AbstractEventListener::invokeEventHandler(ScriptExecutionContext* context, Event* event, v8::Handle<v8::Value> jsEvent)
{
// If jsEvent is empty, attempt to set it as a hidden value would crash v8.
if (jsEvent.IsEmpty())
return;
v8::Local<v8::Context> v8Context = toV8Context(context, worldContext());
if (v8Context.IsEmpty())
return;
// We push the event being processed into the global object, so that it can be exposed by DOMWindow's bindings.
v8::Handle<v8::String> eventSymbol = V8HiddenPropertyName::event();
v8::Local<v8::Value> returnValue;
// In beforeunload/unload handlers, we want to avoid sleeps which do tight loops of calling Date.getTime().
if (event->type() == "beforeunload" || event->type() == "unload")
DateExtension::get()->setAllowSleep(false);
{
// Catch exceptions thrown in the event handler so they do not propagate to javascript code that caused the event to fire.
v8::TryCatch tryCatch;
tryCatch.SetVerbose(true);
// Save the old 'event' property so we can restore it later.
v8::Local<v8::Value> savedEvent = v8Context->Global()->GetHiddenValue(eventSymbol);
tryCatch.Reset();
// Make the event available in the global object, so DOMWindow can expose it.
v8Context->Global()->SetHiddenValue(eventSymbol, jsEvent);
tryCatch.Reset();
returnValue = callListenerFunction(context, jsEvent, event);
if (tryCatch.HasCaught())
event->target()->uncaughtExceptionInEventHandler();
if (!tryCatch.CanContinue())
return;
tryCatch.Reset();
// Restore the old event. This must be done for all exit paths through this method.
if (savedEvent.IsEmpty())
v8Context->Global()->SetHiddenValue(eventSymbol, v8::Undefined());
else
v8Context->Global()->SetHiddenValue(eventSymbol, savedEvent);
tryCatch.Reset();
}
if (event->type() == "beforeunload" || event->type() == "unload")
DateExtension::get()->setAllowSleep(true);
ASSERT(!V8Proxy::handleOutOfMemory() || returnValue.IsEmpty());
if (returnValue.IsEmpty())
return;
if (!returnValue->IsNull() && !returnValue->IsUndefined() && event->storesResultAsString())
event->storeResult(toWebCoreString(returnValue));
// Prevent default action if the return value is false;
// FIXME: Add example, and reference to bug entry.
if (m_isAttribute && returnValue->IsBoolean() && !returnValue->BooleanValue())
event->preventDefault();
}
v8::Local<v8::Object> V8AbstractEventListener::getReceiverObject(Event* event)
{
if (!m_listener.IsEmpty() && !m_listener->IsFunction())
return v8::Local<v8::Object>::New(m_listener);
EventTarget* target = event->currentTarget();
v8::Handle<v8::Value> value = V8DOMWrapper::convertEventTargetToV8Object(target);
if (value.IsEmpty())
return v8::Local<v8::Object>();
return v8::Local<v8::Object>::New(v8::Handle<v8::Object>::Cast(value));
}
} // namespace WebCore
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