1 files changed, 245 insertions, 0 deletions
diff --git a/Source/WebCore/Modules/gamepad/GamepadManager.cpp b/Source/WebCore/Modules/gamepad/GamepadManager.cpp
new file mode 100644
index 000000000..b2ecba196
--- /dev/null
+++ b/Source/WebCore/Modules/gamepad/GamepadManager.cpp
@@ -0,0 +1,245 @@
+/*
+ * Copyright (C) 2014 Apple 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. AND ITS 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 APPLE INC. OR ITS 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 "GamepadManager.h"
+
+#if ENABLE(GAMEPAD)
+
+#include "DOMWindow.h"
+#include "Document.h"
+#include "EventNames.h"
+#include "Gamepad.h"
+#include "GamepadEvent.h"
+#include "GamepadProvider.h"
+#include "Logging.h"
+#include "NavigatorGamepad.h"
+#include "PlatformGamepad.h"
+
+namespace WebCore {
+
+static NavigatorGamepad* navigatorGamepadFromDOMWindow(DOMWindow* window)
+{
+    Navigator* navigator = window->navigator();
+    if (!navigator)
+        return nullptr;
+
+    return NavigatorGamepad::from(navigator);
+}
+
+GamepadManager& GamepadManager::singleton()
+{
+    static NeverDestroyed<GamepadManager> sharedManager;
+    return sharedManager;
+}
+
+GamepadManager::GamepadManager()
+    : m_isMonitoringGamepads(false)
+{
+}
+
+void GamepadManager::platformGamepadConnected(PlatformGamepad& platformGamepad)
+{
+    // Notify blind Navigators and Windows about all gamepads except for this one.
+    for (auto* gamepad : GamepadProvider::singleton().platformGamepads()) {
+        if (!gamepad || gamepad == &platformGamepad)
+            continue;
+
+        makeGamepadVisible(*gamepad, m_gamepadBlindNavigators, m_gamepadBlindDOMWindows);
+    }
+
+    m_gamepadBlindNavigators.clear();
+    m_gamepadBlindDOMWindows.clear();
+
+    // Notify everyone of this new gamepad.
+    makeGamepadVisible(platformGamepad, m_navigators, m_domWindows);
+}
+
+void GamepadManager::platformGamepadDisconnected(PlatformGamepad& platformGamepad)
+{
+    Vector<WeakPtr<DOMWindow>> weakWindows;
+    for (auto* domWindow : m_domWindows)
+        weakWindows.append(domWindow->createWeakPtr());
+
+    HashSet<NavigatorGamepad*> notifiedNavigators;
+
+    // Handle the disconnect for all DOMWindows with event listeners and their Navigators.
+    for (auto& window : weakWindows) {
+        // Event dispatch might have made this window go away.
+        if (!window)
+            continue;
+
+        // This DOMWindow's Navigator might not be accessible. e.g. The DOMWindow might be in the back/forward cache.
+        // If this happens the DOMWindow will not get this gamepaddisconnected event.
+        NavigatorGamepad* navigator = navigatorGamepadFromDOMWindow(window.get());
+        if (!navigator)
+            continue;
+
+        // If this Navigator hasn't seen gamepads yet then its Window should not get the disconnect event.
+        if (m_gamepadBlindNavigators.contains(navigator))
+            continue;
+
+        Ref<Gamepad> gamepad(navigator->gamepadFromPlatformGamepad(platformGamepad));
+
+        navigator->gamepadDisconnected(platformGamepad);
+        notifiedNavigators.add(navigator);
+
+        window->dispatchEvent(GamepadEvent::create(eventNames().gamepaddisconnectedEvent, gamepad.get()), window->document());
+    }
+
+    // Notify all the Navigators that haven't already been notified.
+    for (auto* navigator : m_navigators) {
+        if (!notifiedNavigators.contains(navigator))
+            navigator->gamepadDisconnected(platformGamepad);
+    }
+}
+
+void GamepadManager::platformGamepadInputActivity(bool shouldMakeGamepadVisible)
+{
+    if (!shouldMakeGamepadVisible)
+        return;
+
+    if (m_gamepadBlindNavigators.isEmpty() && m_gamepadBlindDOMWindows.isEmpty())
+        return;
+
+    for (auto* gamepad : GamepadProvider::singleton().platformGamepads()) {
+        if (gamepad)
+            makeGamepadVisible(*gamepad, m_gamepadBlindNavigators, m_gamepadBlindDOMWindows);
+    }
+
+    m_gamepadBlindNavigators.clear();
+    m_gamepadBlindDOMWindows.clear();
+}
+
+void GamepadManager::makeGamepadVisible(PlatformGamepad& platformGamepad, HashSet<NavigatorGamepad*>& navigatorSet, HashSet<DOMWindow*>& domWindowSet)
+{
+    if (navigatorSet.isEmpty() && domWindowSet.isEmpty())
+        return;
+
+    for (auto* navigator : navigatorSet)
+        navigator->gamepadConnected(platformGamepad);
+
+    Vector<WeakPtr<DOMWindow>> weakWindows;
+    for (auto* domWindow : m_domWindows)
+        weakWindows.append(domWindow->createWeakPtr());
+
+    for (auto& window : weakWindows) {
+        // Event dispatch might have made this window go away.
+        if (!window)
+            continue;
+
+        // This DOMWindow's Navigator might not be accessible. e.g. The DOMWindow might be in the back/forward cache.
+        // If this happens the DOMWindow will not get this gamepadconnected event.
+        // The new gamepad will still be visibile to it once it is restored from the back/forward cache.
+        NavigatorGamepad* navigator = navigatorGamepadFromDOMWindow(window.get());
+        if (!navigator)
+            continue;
+
+        Ref<Gamepad> gamepad(navigator->gamepadFromPlatformGamepad(platformGamepad));
+        window->dispatchEvent(GamepadEvent::create(eventNames().gamepadconnectedEvent, gamepad.get()), window->document());
+    }
+}
+
+void GamepadManager::registerNavigator(NavigatorGamepad* navigator)
+{
+    LOG(Gamepad, "GamepadManager registering NavigatorGamepad %p", navigator);
+
+    ASSERT(!m_navigators.contains(navigator));
+    m_navigators.add(navigator);
+    m_gamepadBlindNavigators.add(navigator);
+
+    maybeStartMonitoringGamepads();
+}
+
+void GamepadManager::unregisterNavigator(NavigatorGamepad* navigator)
+{
+    LOG(Gamepad, "GamepadManager unregistering NavigatorGamepad %p", navigator);
+
+    ASSERT(m_navigators.contains(navigator));
+    m_navigators.remove(navigator);
+    m_gamepadBlindNavigators.remove(navigator);
+
+    maybeStopMonitoringGamepads();
+}
+
+void GamepadManager::registerDOMWindow(DOMWindow* window)
+{
+    LOG(Gamepad, "GamepadManager registering DOMWindow %p", window);
+
+    ASSERT(!m_domWindows.contains(window));
+    m_domWindows.add(window);
+
+    // Anytime we register a DOMWindow, we should also double check that its NavigatorGamepad is registered.
+    NavigatorGamepad* navigator = navigatorGamepadFromDOMWindow(window);
+    ASSERT(navigator);
+
+    if (m_navigators.add(navigator).isNewEntry)
+        m_gamepadBlindNavigators.add(navigator);
+
+    // If this DOMWindow's NavigatorGamepad was already registered but was still blind,
+    // then this DOMWindow should be blind.
+    if (m_gamepadBlindNavigators.contains(navigator))
+        m_gamepadBlindDOMWindows.add(window);
+
+    maybeStartMonitoringGamepads();
+}
+
+void GamepadManager::unregisterDOMWindow(DOMWindow* window)
+{
+    LOG(Gamepad, "GamepadManager unregistering DOMWindow %p", window);
+
+    ASSERT(m_domWindows.contains(window));
+    m_domWindows.remove(window);
+    m_gamepadBlindDOMWindows.remove(window);
+
+    maybeStopMonitoringGamepads();
+}
+
+void GamepadManager::maybeStartMonitoringGamepads()
+{
+    if (m_isMonitoringGamepads)
+        return;
+
+    if (!m_navigators.isEmpty() || !m_domWindows.isEmpty()) {
+        LOG(Gamepad, "GamepadManager has %i NavigatorGamepads and %i DOMWindows registered, is starting gamepad monitoring", m_navigators.size(), m_domWindows.size());
+        m_isMonitoringGamepads = true;
+        GamepadProvider::singleton().startMonitoringGamepads(*this);
+    }
+}
+
+void GamepadManager::maybeStopMonitoringGamepads()
+{
+    if (!m_isMonitoringGamepads)
+        return;
+
+    if (m_navigators.isEmpty() && m_domWindows.isEmpty()) {
+        LOG(Gamepad, "GamepadManager has no NavigatorGamepads or DOMWindows registered, is stopping gamepad monitoring");
+        m_isMonitoringGamepads = false;
+        GamepadProvider::singleton().stopMonitoringGamepads(*this);
+    }
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(GAMEPAD)