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

Source/core/frame/DeviceEventDispatcherBase.cpp

 /*
- * Copyright (C) 2013 Google Inc. All rights reserved.
+ * 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/DeviceSensorEventDispatcher.h"
+#include "core/frame/DeviceEventDispatcherBase.h"
+
+#include "core/frame/DeviceEventControllerBase.h"
+#include "wtf/TemporaryChange.h"
 
 namespace WebCore {
 
-DeviceSensorEventDispatcher::DeviceSensorEventDispatcher()
+DeviceEventDispatcherBase::DeviceEventDispatcherBase()
     : m_needsPurge(false)
     , m_isDispatching(false)
 {
 }
 
-DeviceSensorEventDispatcher::~DeviceSensorEventDispatcher()
+DeviceEventDispatcherBase::~DeviceEventDispatcherBase()
 {
 }
 
-void DeviceSensorEventDispatcher::addController(DeviceSensorEventController* controller)
+void DeviceEventDispatcherBase::addController(DeviceEventControllerBase* controller)
 {
     bool wasEmpty = m_controllers.isEmpty();
     if (!m_controllers.contains(controller))
         m_controllers.append(controller);
     if (wasEmpty)
         startListening();
 }
 
-void DeviceSensorEventDispatcher::removeController(DeviceSensorEventController* controller)
+void DeviceEventDispatcherBase::removeController(DeviceEventControllerBase* controller)
 {
     // Do not actually remove the controller from the vector, instead zero them out.
     // The zeros are removed in these two cases:
     // 1. either immediately if we are not dispatching any events,
-    // 2. or after events to all controllers have dispatched
-    // (see e.g. DeviceOrientationDispatcher::didChangeDeviceOrientation).
+    // 2. or after events to all controllers have dispatched (see notifyControllers()).
     // This is to correctly handle the re-entrancy case when a controller is destroyed
     // while the events are still being dispatched.
     size_t index = m_controllers.find(controller);
     if (index == kNotFound)
         return;
 
     m_controllers[index] = 0;
     m_needsPurge = true;
 
     if (!m_isDispatching)
         purgeControllers();
 }
 
-void DeviceSensorEventDispatcher::purgeControllers()
+void DeviceEventDispatcherBase::purgeControllers()
 {
     ASSERT(m_needsPurge);
 
     size_t i = 0;
     while (i < m_controllers.size()) {
         if (!m_controllers[i]) {
             m_controllers[i] = m_controllers.last();
             m_controllers.removeLast();
         } else {
             ++i;
         }
     }
 
     m_needsPurge = false;
 
     if (m_controllers.isEmpty())
         stopListening();
 }
 
+void DeviceEventDispatcherBase::notifyControllers()
+{
+    {
+        TemporaryChange<bool> changeIsDispatching(m_isDispatching, true);
+        // Don't notify controllers removed or added during event dispatch.
+        size_t size = m_controllers.size();
+        for (size_t i = 0; i < size; ++i) {
+            if (m_controllers[i])
+                m_controllers[i]->didUpdateData();
+        }
+    }
+
+    if (m_needsPurge)
+        purgeControllers();
+}
+
 } // namespace WebCore