Index: Source/core/frame/DeviceEventDispatcherBase.cpp |
diff --git a/Source/core/frame/DeviceEventDispatcherBase.cpp b/Source/core/frame/DeviceEventDispatcherBase.cpp |
new file mode 100644 |
index 0000000000000000000000000000000000000000..4f01bf52cde3799dc4ce9e27f7b139234454ffd0 |
--- /dev/null |
+++ b/Source/core/frame/DeviceEventDispatcherBase.cpp |
@@ -0,0 +1,87 @@ |
+// Copyright 2014 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#include "config.h" |
+#include "core/frame/DeviceEventDispatcherBase.h" |
+ |
+#include "core/frame/DeviceEventControllerBase.h" |
+#include "wtf/TemporaryChange.h" |
+ |
+namespace WebCore { |
+ |
+DeviceEventDispatcherBase::DeviceEventDispatcherBase() |
+ : m_needsPurge(false) |
+ , m_isDispatching(false) |
+{ |
+} |
+ |
+DeviceEventDispatcherBase::~DeviceEventDispatcherBase() |
+{ |
+} |
+ |
+void DeviceEventDispatcherBase::addController(DeviceEventControllerBase* controller) |
+{ |
+ bool wasEmpty = m_controllers.isEmpty(); |
+ if (!m_controllers.contains(controller)) |
+ m_controllers.append(controller); |
+ if (wasEmpty) |
+ startListening(); |
+} |
+ |
+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 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 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 |