| /* |
| * 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 "bindings/v8/V8AbstractEventListener.h" |
| |
| #include "V8Event.h" |
| #include "V8EventTarget.h" |
| #include "bindings/v8/V8Binding.h" |
| #include "bindings/v8/V8EventListenerList.h" |
| #include "bindings/v8/V8HiddenPropertyName.h" |
| #include "core/events/BeforeUnloadEvent.h" |
| #include "core/events/Event.h" |
| #include "core/events/ThreadLocalEventNames.h" |
| #include "core/inspector/InspectorCounters.h" |
| #include "core/workers/WorkerGlobalScope.h" |
| |
| namespace WebCore { |
| |
| V8AbstractEventListener::V8AbstractEventListener(bool isAttribute, PassRefPtr<DOMWrapperWorld> world, v8::Isolate* isolate) |
| : EventListener(JSEventListenerType) |
| , m_isAttribute(isAttribute) |
| , m_world(world) |
| , m_isolate(isolate) |
| { |
| if (isMainThread()) |
| InspectorCounters::incrementCounter(InspectorCounters::JSEventListenerCounter); |
| } |
| |
| V8AbstractEventListener::~V8AbstractEventListener() |
| { |
| if (!m_listener.isEmpty()) { |
| v8::HandleScope scope(m_isolate); |
| V8EventListenerList::clearWrapper(m_listener.newLocal(m_isolate), m_isAttribute, m_isolate); |
| } |
| if (isMainThread()) |
| InspectorCounters::decrementCounter(InspectorCounters::JSEventListenerCounter); |
| } |
| |
| void V8AbstractEventListener::handleEvent(ExecutionContext* context, Event* event) |
| { |
| // Don't reenter V8 if execution was terminated in this instance of V8. |
| if (context->isJSExecutionForbidden()) |
| return; |
| |
| 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(m_isolate); |
| |
| v8::Local<v8::Context> v8Context = toV8Context(context, world()); |
| 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::Isolate* isolate = v8Context->GetIsolate(); |
| v8::Handle<v8::Value> jsEvent = toV8(event, v8::Handle<v8::Object>(), isolate); |
| if (jsEvent.IsEmpty()) |
| return; |
| invokeEventHandler(context, event, v8::Local<v8::Value>::New(isolate, jsEvent)); |
| } |
| |
| void V8AbstractEventListener::setListenerObject(v8::Handle<v8::Object> listener) |
| { |
| m_listener.set(m_isolate, listener); |
| m_listener.setWeak(this, &setWeakCallback); |
| } |
| |
| void V8AbstractEventListener::invokeEventHandler(ExecutionContext* context, Event* event, v8::Local<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, world()); |
| 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(v8Context->GetIsolate()); |
| 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 = 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()) { // Result of TerminateExecution(). |
| if (context->isWorkerGlobalScope()) |
| toWorkerGlobalScope(context)->script()->forbidExecution(); |
| 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(v8Context->GetIsolate())); |
| else |
| v8Context->Global()->SetHiddenValue(eventSymbol, savedEvent); |
| tryCatch.Reset(); |
| } |
| |
| ASSERT(!handleOutOfMemory() || returnValue.IsEmpty()); |
| |
| if (returnValue.IsEmpty()) |
| return; |
| |
| if (!returnValue->IsNull() && !returnValue->IsUndefined() && event->isBeforeUnloadEvent()) { |
| V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<>, stringReturnValue, returnValue); |
| toBeforeUnloadEvent(event)->setReturnValue(stringReturnValue); |
| } |
| |
| if (m_isAttribute && shouldPreventDefault(returnValue)) |
| event->preventDefault(); |
| } |
| |
| bool V8AbstractEventListener::shouldPreventDefault(v8::Local<v8::Value> returnValue) |
| { |
| // Prevent default action if the return value is false in accord with the spec |
| // http://www.w3.org/TR/html5/webappapis.html#event-handler-attributes |
| return returnValue->IsBoolean() && !returnValue->BooleanValue(); |
| } |
| |
| v8::Local<v8::Object> V8AbstractEventListener::getReceiverObject(ExecutionContext* context, Event* event) |
| { |
| v8::Isolate* isolate = toV8Context(context, world())->GetIsolate(); |
| v8::Local<v8::Object> listener = m_listener.newLocal(isolate); |
| if (!m_listener.isEmpty() && !listener->IsFunction()) |
| return listener; |
| |
| EventTarget* target = event->currentTarget(); |
| v8::Handle<v8::Value> value = toV8(target, v8::Handle<v8::Object>(), isolate); |
| if (value.IsEmpty()) |
| return v8::Local<v8::Object>(); |
| return v8::Local<v8::Object>::New(isolate, v8::Handle<v8::Object>::Cast(value)); |
| } |
| |
| void V8AbstractEventListener::setWeakCallback(const v8::WeakCallbackData<v8::Object, V8AbstractEventListener> &data) |
| { |
| data.GetParameter()->m_listener.clear(); |
| } |
| |
| } // namespace WebCore |