| /* |
| * 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 |