Generalize and refactor DeviceSensorEvent* architecture to support multi-event type targets.

Source/core/frame/DeviceSingleWindowEventController.cpp

Index: Source/core/frame/DeviceSingleWindowEventController.cpp
diff --git a/Source/core/frame/DeviceSingleWindowEventController.cpp b/Source/core/frame/DeviceSingleWindowEventController.cpp
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index 0000000000000000000000000000000000000000..aed8bc60682f21776ab69f547c45a29901257f01
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+++ b/Source/core/frame/DeviceSingleWindowEventController.cpp
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+/*
+ * Copyright (C) 2014 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 "core/frame/DeviceSingleWindowEventController.h"
+
+#include "core/dom/Document.h"
+#include "core/frame/DOMWindow.h"
+#include "core/page/Page.h"
+
+namespace WebCore {
+
+DeviceSingleWindowEventController::DeviceSingleWindowEventController(Document& document)
+    : DeviceEventControllerBase(document.page())
+    , DOMWindowLifecycleObserver(document.domWindow())
+    , m_needsCheckingNullEvents(true)
+    , m_document(document)
+{
+}
+
+DeviceSingleWindowEventController::~DeviceSingleWindowEventController()
+{
+}
+
+void DeviceSingleWindowEventController::didUpdateData()
+{
+    dispatchDeviceEvent(getLastEvent());
+}
+
+void DeviceSingleWindowEventController::dispatchDeviceEvent(PassRefPtrWillBeRawPtr<Event> prpEvent)
+{
+    if (!m_document.domWindow() || m_document.activeDOMObjectsAreSuspended() || m_document.activeDOMObjectsAreStopped())
+        return;
+
+    RefPtrWillBeRawPtr<Event> event = prpEvent;
+    m_document.domWindow()->dispatchEvent(event);
+
+    if (m_needsCheckingNullEvents) {
+        if (isNullEvent(event.get()))
+            stopUpdating();
+        else
+            m_needsCheckingNullEvents = false;
+    }
+}
+
+void DeviceSingleWindowEventController::didAddEventListener(DOMWindow* window, const AtomicString& eventType)
+{
+    if (eventType != getEventTypeName())
+        return;
+
+    if (page() && page()->visibilityState() == PageVisibilityStateVisible)
+        startUpdating();
+
+    m_hasEventListener = true;
+}
+
+void DeviceSingleWindowEventController::didRemoveEventListener(DOMWindow* window, const AtomicString& eventType)
+{
+    if (eventType != getEventTypeName() || window->hasEventListeners(getEventTypeName()))
+        return;
+
+    stopUpdating();
+    m_hasEventListener = false;
+}
+
+void DeviceSingleWindowEventController::didRemoveAllEventListeners(DOMWindow*)
+{
+    stopUpdating();
+    m_hasEventListener = false;
+}
+
+} // namespace WebCore