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

Source/core/page/PageLifecycleNotifier.h

+
+/*
+ * 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 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 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.
+ */
+
+#ifndef PageLifecycleNotifier_h
+#define PageLifecycleNotifier_h
+
+#include "core/dom/LifecycleNotifier.h"
+#include "core/page/PageLifecycleObserver.h"
+#include "wtf/PassOwnPtr.h"
+#include "wtf/TemporaryChange.h"
+
+namespace WebCore {
+
+class Page;
+
+class PageLifecycleNotifier : public LifecycleNotifier {
+public:
+    static PassOwnPtr<PageLifecycleNotifier> create(LifecycleContext*);
+
+    void notifyPageVisibilityChanged();
+
+    virtual void addObserver(LifecycleObserver*, LifecycleObserver::Type) OVERRIDE;
+    virtual void removeObserver(LifecycleObserver*, LifecycleObserver::Type) OVERRIDE;
+
+private:
+    explicit PageLifecycleNotifier(LifecycleContext*);
+
+    typedef HashSet<PageLifecycleObserver*> PageObserverSet;
+    PageObserverSet m_pageObservers;
+};
+
+inline PassOwnPtr<PageLifecycleNotifier> PageLifecycleNotifier::create(LifecycleContext* context)
+{
+    return adoptPtr(new PageLifecycleNotifier(context));
+}
+
+inline void PageLifecycleNotifier::notifyPageVisibilityChanged()
+{
+    TemporaryChange<IterationType> scope(this->m_iterating, IteratingOverPageObservers);
+    for (PageObserverSet::iterator it = m_pageObservers.begin(); it != m_pageObservers.end(); ++it)
+        (*it)->pageVisibilityChanged();
+}
+
+} // namespace WebCore
+
+#endif // PageLifecycleNotifier_h