Extract simpler classes for observing context lifecycle and observe Page lifecycle inNavigatorVibra…

Source/core/dom/LifecycleContext.cpp

+/*
+ * Copyright (C) 2013 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:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 "core/dom/LifecycleContext.h"
+
+#include "core/dom/LifecycleNotifier.h"
+
+namespace WebCore {
+
+LifecycleContext::LifecycleContext()
+{
+}
+
+LifecycleContext::~LifecycleContext()
+{
+}
+
+void LifecycleContext::wasObservedBy(LifecycleObserver* observer, LifecycleObserver::Type type)
+{
+    lifecycleNotifier()->addObserver(observer, type);
+}
+
+void LifecycleContext::wasUnobservedBy(LifecycleObserver* observer, LifecycleObserver::Type type)
+{
+    lifecycleNotifier()->removeObserver(observer, type);
+}
+
+LifecycleNotifier* LifecycleContext::lifecycleNotifier()
+{
+    if (!m_lifecycleNotifier)
+        m_lifecycleNotifier = const_cast<LifecycleContext*>(this)->createLifecycleNotifier();
+    return m_lifecycleNotifier.get();
+}
+
+PassOwnPtr<LifecycleNotifier> LifecycleContext::createLifecycleNotifier()
+{
+    return LifecycleNotifier::create(this);
+}
+
+} // namespace WebCore