Import Dart bindings as of Blink r188698. This merely copies the files over and does not attach any…

sky/engine/bindings-dart/core/dart/DartEventListener.cpp

Index: sky/engine/bindings-dart/core/dart/DartEventListener.cpp
diff --git a/sky/engine/bindings-dart/core/dart/DartEventListener.cpp b/sky/engine/bindings-dart/core/dart/DartEventListener.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..04d5d77d39b74066415aa005f09f177b4b09e6db
--- /dev/null
+++ b/sky/engine/bindings-dart/core/dart/DartEventListener.cpp
@@ -0,0 +1,149 @@
+/*
+ * Copyright (C) 2011 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/core/dart/DartEventListener.h"
+
+#include "bindings/core/dart/DartController.h"
+#include "bindings/core/dart/DartDOMData.h"
+#include "bindings/core/dart/DartEvent.h"
+#include "bindings/core/dart/DartUtilities.h"
+#include "core/dom/ExecutionContext.h"
+#include "core/events/BeforeUnloadEvent.h"
+
+namespace blink {
+
+DartEventListener::DartEventListener()
+    : EventListener(static_cast<EventListener::Type>(DartEventListenerType))
+    , m_isolate(0)
+    , m_listener(0)
+{
+}
+
+DartEventListener::~DartEventListener()
+{
+    ASSERT(!m_listener);
+}
+
+DartEventListener* DartEventListener::createOrFetch(Dart_Handle closure)
+{
+    ASSERT(Dart_IsClosure(closure));
+    void* peer;
+    Dart_Handle ALLOW_UNUSED result = Dart_GetPeer(closure, &peer);
+    ASSERT(!Dart_IsError(result));
+    DartEventListener* existingListener = static_cast<DartEventListener*>(peer);
+    if (existingListener)
+        return existingListener;
+
+    RefPtr<DartEventListener> listener = adoptRef(new DartEventListener());
+    DartEventListener* listenerObj = listener.get();
+    intptr_t peerSize = sizeof(*listenerObj);
+    listener->m_isolate = Dart_CurrentIsolate();
+    listener->m_listener = Dart_NewPrologueWeakPersistentHandle(closure, listenerObj, peerSize, &weakCallback);
+    result = Dart_SetPeer(closure, listenerObj);
+    ASSERT(!Dart_IsError(result));
+    listener->ref();
+    return listenerObj;
+}
+
+void DartEventListener::weakCallback(void* isolateCallbackData, Dart_WeakPersistentHandle handle, void* peer)
+{
+    DartEventListener* listener = static_cast<DartEventListener*>(peer);
+    listener->m_listener = 0;
+    listener->deref();
+}
+
+void DartEventListener::handleEvent(ExecutionContext* context, Event* event)
+{
+    if (!m_listener)
+        return;
+
+    // Don't reenter Dart if execution was terminated in this instance of Dart.
+    // FIXME: we probably need isDartExecutionForbidden.
+    if (context->isJSExecutionForbidden())
+        return;
+
+    ASSERT(event);
+
+    DartIsolateScope scope(m_isolate);
+    DartApiScope apiScope;
+
+    // The callback function on XMLHttpRequest can clear the event listener and destroys 'this' object. Keep a local reference to it.
+    // See issue 889829.
+    RefPtr<DartEventListener> protect(this);
+    // Keep a strong handle to the listener.
+    Dart_Handle listener = Dart_HandleFromWeakPersistent(m_listener);
+
+    // Get the Dart wrapper for the event object.
+    Dart_Handle dartEvent = DartEvent::toDart(event);
+    ASSERT(dartEvent);
+
+    // FIXME: consider if DateExtension manipulations are necessary and if yes (most probably),
+    // factor out common logic. For example by introducing EventProcessScope RAII to manage DateExtension.
+    Dart_Handle result = callListenerFunction(context, listener, dartEvent);
+    if (Dart_IsError(result)) {
+        DartUtilities::reportProblem(context, result);
+        return;
+    }
+
+    if (Dart_IsString(result)) {
+        if (event->isBeforeUnloadEvent())
+            toBeforeUnloadEvent(event)->setReturnValue(DartUtilities::toString(result));
+    }
+}
+
+EventListener* DartEventListener::toNative(Dart_Handle handle, Dart_Handle& exception)
+{
+    if (Dart_IsNull(handle)) {
+        exception = Dart_NewStringFromCString("Null passed where Dart closure is expected");
+        return 0;
+    }
+
+    if (!Dart_IsClosure(handle)) {
+        exception = Dart_NewStringFromCString("Not a Dart closure passed");
+        return 0;
+    }
+
+    return createOrFetch(handle);
+}
+
+Dart_Handle DartEventListener::callListenerFunction(ExecutionContext* context, Dart_Handle listener, Dart_Handle dartEvent)
+{
+    ASSERT(listener);
+
+    DartController* dartController = DartController::retrieve(context);
+    if (!dartController)
+        return Dart_NewApiError("Internal error: failed to fetch Dart controller");
+
+    Dart_Handle parameters[1] = { dartEvent };
+    return dartController->callFunction(listener, 1, parameters);
+}
+
+}