Gamepad API: add support for gamepadconnected and gamepaddisconnected events

Source/modules/gamepad/GamepadDispatcher.cpp

+// 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 "modules/gamepad/GamepadDispatcher.h"
+
+#include "modules/gamepad/NavigatorGamepad.h"
+#include "public/platform/Platform.h"
+#include "wtf/TemporaryChange.h"
+
+namespace WebCore {
+
+GamepadDispatcher& GamepadDispatcher::instance()
+{
+    DEFINE_STATIC_LOCAL(GamepadDispatcher, gamepadDispatcher, ());
+    return gamepadDispatcher;
+}
+
+void GamepadDispatcher::addClient(NavigatorGamepad* client)
+{
+    addController(client);
+}
+
+void GamepadDispatcher::removeClient(NavigatorGamepad* client)
+{
+    removeController(client);
+}
+
+void GamepadDispatcher::sampleGamepads(blink::WebGamepads& gamepads)
+{
+    ASSERT(!m_controllers.isEmpty());
+    blink::Platform::current()->sampleGamepads(gamepads);
+}
+
+GamepadDispatcher::GamepadDispatcher()
+{
+}
+
+GamepadDispatcher::~GamepadDispatcher()
+{
+}
+
+void GamepadDispatcher::didConnectGamepad(unsigned index, const blink::WebGamepad& gamepad)
+{
+    dispatchDidConnectOrDisconnectGamepad(index, gamepad, true);
+}
+
+void GamepadDispatcher::didDisconnectGamepad(unsigned index, const blink::WebGamepad& gamepad)
+{
+    dispatchDidConnectOrDisconnectGamepad(index, gamepad, false);
+}
+
+void GamepadDispatcher::dispatchDidConnectOrDisconnectGamepad(unsigned index, const blink::WebGamepad& gamepad, bool connected)
+{
+    {
+        TemporaryChange<bool> changeIsDispatching(m_isDispatching, true);
+        // Don't fire 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])
+                static_cast<NavigatorGamepad*>(m_controllers[i])->didConnectOrDisconnectGamepad(index, gamepad, connected);
+        }
+    }
+
+    if (m_needsPurge)
+        purgeControllers();
+}
+
+void GamepadDispatcher::startListening()
+{
+    blink::Platform::current()->setGamepadListener(this);
+}
+
+void GamepadDispatcher::stopListening()
+{
+    blink::Platform::current()->setGamepadListener(0);
+}
+
+} // namespace WebCore