Index: third_party/WebKit/WebCore/bindings/v8/V8AbstractEventListener.cpp |
=================================================================== |
--- third_party/WebKit/WebCore/bindings/v8/V8AbstractEventListener.cpp (revision 0) |
+++ third_party/WebKit/WebCore/bindings/v8/V8AbstractEventListener.cpp (revision 11711) |
@@ -0,0 +1,165 @@ |
+/* |
+ * 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 isInline) |
+ : m_isInline(isInline) |
+ , m_frame(frame) |
+ , m_lineNumber(0) |
+ , m_columnNumber(0) |
+{ |
+ if (!m_frame) |
+ return; |
+ |
+ // Get the position in the source if any. |
+ if (m_isInline && 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) |
+{ |
+ // For compatibility, we store the event object as a property on the window called "event". Because this is the global namespace, we save away any |
+ // existing "event" property, and then restore it after executing the javascript handler. |
+ 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. |
+ // Setting and getting the 'event' property on the global object can throw exceptions as well (for instance if accessors that |
+ // throw exceptions are defined for 'event' using __defineGetter__ and __defineSetter__ on the global object). |
+ v8::TryCatch tryCatch; |
+ tryCatch.SetVerbose(true); |
+ |
+ // Save the old 'event' property so we can restore it later. |
+ v8::Local<v8::Value> savedEvent = context->Global()->Get(eventSymbol); |
+ tryCatch.Reset(); |
+ |
+ // Make the event available in the window object. |
+ // |
+ // FIXME: This does not work as it does with jsc bindings if the window.event property is already set. We need to make sure that property |
+ // access is intercepted correctly. |
+ context->Global()->Set(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()->Set(eventSymbol, v8::Undefined()); |
+ else |
+ context->Global()->Set(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_isInline && 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::updateDocumentsRendering(); |
+} |
+ |
+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 |