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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 "Document.h"
#include "Event.h"
#include "Frame.h"
#include "Tokenizer.h"
#include "V8Binding.h"
namespace WebCore {
V8AbstractEventListener::V8AbstractEventListener(Frame* frame, bool isAttribute)
: m_isAttribute(isAttribute)
, m_frame(frame)
, m_lineNumber(0)
, m_columnNumber(0)
{
if (!m_frame)
return;
// Get the position in the source if any.
if (m_isAttribute && m_frame->document()->tokenizer()) {
m_lineNumber = m_frame->document()->tokenizer()->lineNumber();
m_columnNumber = m_frame->document()->tokenizer()->columnNumber();
}
}
void V8AbstractEventListener::invokeEventHandler(v8::Handle<v8::Context> context, Event* event, v8::Handle<v8::Value> jsEvent, bool isWindowEvent)
{
// We push the event being processed into the global object, so that it can be exposed by DOMWindow's bindings.
v8::Local<v8::String> eventSymbol = v8::String::NewSymbol("event");
v8::Local<v8::Value> returnValue;
{
// 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 = context->Global()->GetHiddenValue(eventSymbol);
tryCatch.Reset();
// Make the event available in the global object, so DOMWindow can expose it.
context->Global()->SetHiddenValue(eventSymbol, jsEvent);
tryCatch.Reset();
// Call the event handler.
returnValue = callListenerFunction(jsEvent, event, isWindowEvent);
tryCatch.Reset();
// Restore the old event. This must be done for all exit paths through this method.
if (savedEvent.IsEmpty())
context->Global()->SetHiddenValue(eventSymbol, v8::Undefined());
else
context->Global()->SetHiddenValue(eventSymbol, savedEvent);
tryCatch.Reset();
}
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();
}
void V8AbstractEventListener::handleEvent(Event* event, bool isWindowEvent)
{
// EventListener could be disconnected from the frame.
if (disconnected())
return;
// 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::Handle<v8::Context> context = V8Proxy::GetContext(m_frame);
if (context.IsEmpty())
return;
// m_frame can removed by the callback function, protect it until the callback function returns.
RefPtr<Frame> protectFrame(m_frame);
// Enter the V8 context in which to perform the event handling.
v8::Context::Scope scope(context);
// Get the V8 wrapper for the event object.
v8::Handle<v8::Value> jsEvent = V8Proxy::EventToV8Object(event);
invokeEventHandler(context, event, jsEvent, isWindowEvent);
Document::updateStyleForAllDocuments();
}
void V8AbstractEventListener::disposeListenerObject()
{
if (!m_listener.IsEmpty()) {
#ifndef NDEBUG
V8Proxy::UnregisterGlobalHandle(this, m_listener);
#endif
m_listener.Dispose();
m_listener.Clear();
}
}
v8::Local<v8::Object> V8AbstractEventListener::getReceiverObject(Event* event, bool isWindowEvent)
{
if (!m_listener.IsEmpty() && !m_listener->IsFunction())
return v8::Local<v8::Object>::New(m_listener);
if (isWindowEvent)
return v8::Context::GetCurrent()->Global();
EventTarget* target = event->currentTarget();
v8::Handle<v8::Value> value = V8Proxy::EventTargetToV8Object(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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