Gamepad API: add support for gamepadconnected and gamepaddisconnected events

Source/modules/gamepad/NavigatorGamepad.cpp

Index: Source/modules/gamepad/NavigatorGamepad.cpp
diff --git a/Source/modules/gamepad/NavigatorGamepad.cpp b/Source/modules/gamepad/NavigatorGamepad.cpp
index fddb7d02fface76ad791cd91d9fa42200ae053ef..4060f0c61500df08d9d6bdbcae8ce9e6740f519d 100644
--- a/Source/modules/gamepad/NavigatorGamepad.cpp
+++ b/Source/modules/gamepad/NavigatorGamepad.cpp
@@ -26,11 +26,16 @@
 #include "config.h"
 #include "modules/gamepad/NavigatorGamepad.h"
 
+#include "RuntimeEnabledFeatures.h"
+#include "core/dom/Document.h"
+#include "core/frame/DOMWindow.h"
+#include "core/frame/LocalFrame.h"
 #include "core/frame/Navigator.h"
+#include "core/page/Page.h"
+#include "modules/gamepad/GamepadDispatcher.h"
+#include "modules/gamepad/GamepadEvent.h"
 #include "modules/gamepad/GamepadList.h"
 #include "modules/gamepad/WebKitGamepadList.h"
-#include "public/platform/Platform.h"
-#include "wtf/PassOwnPtr.h"
 
 namespace WebCore {
 
@@ -51,7 +56,7 @@ static void sampleGamepads(ListType* into)
 {
     blink::WebGamepads gamepads;
 
-    blink::Platform::current()->sampleGamepads(gamepads);
+    GamepadDispatcher::instance().sampleGamepads(gamepads);
 
     for (unsigned i = 0; i < blink::WebGamepads::itemsLengthCap; ++i) {
         blink::WebGamepad& webGamepad = gamepads.items[i];
@@ -67,24 +72,19 @@ static void sampleGamepads(ListType* into)
     }
 }
 
-NavigatorGamepad::NavigatorGamepad()
+NavigatorGamepad* NavigatorGamepad::from(Document& document)
 {
-}
-
-NavigatorGamepad::~NavigatorGamepad()
-{
-}
-
-const char* NavigatorGamepad::supplementName()
-{
-    return "NavigatorGamepad";
+    if (!document.frame() || !document.frame()->domWindow())
+        return 0;
+    Navigator& navigator = document.frame()->domWindow()->navigator();
+    return &from(navigator);
 }
 
 NavigatorGamepad& NavigatorGamepad::from(Navigator& navigator)
 {
     NavigatorGamepad* supplement = static_cast<NavigatorGamepad*>(WillBeHeapSupplement<Navigator>::from(navigator, supplementName()));
     if (!supplement) {
-        supplement = new NavigatorGamepad();
+        supplement = new NavigatorGamepad(*navigator.frame()->document());
         provideTo(navigator, supplementName(), adoptPtrWillBeNoop(supplement));
     }
     return *supplement;
@@ -102,6 +102,7 @@ GamepadList* NavigatorGamepad::getGamepads(Navigator& navigator)
 
 WebKitGamepadList* NavigatorGamepad::webkitGamepads()
 {
+    startUpdating();
     if (!m_webkitGamepads)
         m_webkitGamepads = WebKitGamepadList::create();
     sampleGamepads<WebKitGamepad>(m_webkitGamepads.get());
@@ -110,6 +111,7 @@ WebKitGamepadList* NavigatorGamepad::webkitGamepads()
 
 GamepadList* NavigatorGamepad::gamepads()
 {
+    startUpdating();
     if (!m_gamepads)
         m_gamepads = GamepadList::create();
     sampleGamepads<Gamepad>(m_gamepads.get());
@@ -122,4 +124,111 @@ void NavigatorGamepad::trace(Visitor* visitor)
     visitor->trace(m_webkitGamepads);
 }
 
+void NavigatorGamepad::didConnectOrDisconnectGamepad(unsigned index, const blink::WebGamepad& webGamepad, bool connected)
+{
+    ASSERT(index < blink::WebGamepads::itemsLengthCap);
+    ASSERT(connected == webGamepad.connected);
+
+    // We should stop listening once we detached.
+    ASSERT(window());
+
+    // We register to the dispatcher before sampling gamepads so we need to check if we actually have an event listener.
+    if (!m_hasEventListener)
+        return;
+
+    if (window()->document()->activeDOMObjectsAreStopped() || window()->document()->activeDOMObjectsAreSuspended())
+        return;
+
+    if (!m_gamepads)
+        m_gamepads = GamepadList::create();
+
+    RefPtrWillBeRawPtr<Gamepad> gamepad = m_gamepads->item(index);
+    if (!gamepad)
+        gamepad = Gamepad::create();
+    sampleGamepad(index, *gamepad, webGamepad);
+    m_gamepads->set(index, gamepad);
+
+    const AtomicString& eventName = connected ? EventTypeNames::gamepadconnected : EventTypeNames::gamepaddisconnected;
+    RefPtr<GamepadEvent> event = GamepadEvent::create(eventName, false, true, gamepad.get());
+    window()->dispatchEvent(event);
+}
+
+NavigatorGamepad::NavigatorGamepad(Document& document)
+    : DOMWindowProperty(document.frame())
+    , DeviceSensorEventController(document)
+    , DOMWindowLifecycleObserver(document.frame()->domWindow())
+{
+}
+
+NavigatorGamepad::~NavigatorGamepad()
+{
+}
+
+const char* NavigatorGamepad::supplementName()
+{
+    return "NavigatorGamepad";
+}
+
+void NavigatorGamepad::willDestroyGlobalObjectInFrame()
+{
+    stopUpdating();
+    DOMWindowProperty::willDestroyGlobalObjectInFrame();
+}
+
+void NavigatorGamepad::willDetachGlobalObjectFromFrame()
+{
+    stopUpdating();
+    DOMWindowProperty::willDetachGlobalObjectFromFrame();
+}
+
+void NavigatorGamepad::registerWithDispatcher()
+{
+    GamepadDispatcher::instance().addClient(this);
+}
+
+void NavigatorGamepad::unregisterWithDispatcher()
+{
+    GamepadDispatcher::instance().removeClient(this);
+}
+
+bool NavigatorGamepad::hasLastData()
+{
+    // Gamepad data is polled instead of pushed.
+    return false;
+}
+
+PassRefPtr<Event> NavigatorGamepad::getLastEvent()
+{
+    // This is called only when hasLastData() is true.
+    ASSERT_NOT_REACHED();
+    return nullptr;
+}
+
+bool NavigatorGamepad::isNullEvent(Event*)
+{
+    // This is called only when hasLastData() is true.
+    ASSERT_NOT_REACHED();
+    return false;
+}
+
+void NavigatorGamepad::didAddEventListener(DOMWindow*, const AtomicString& eventType)
+{
+    if (RuntimeEnabledFeatures::gamepadEnabled() && (eventType == EventTypeNames::gamepadconnected || eventType == EventTypeNames::gamepaddisconnected)) {
+        if (page() && page()->visibilityState() == PageVisibilityStateVisible)
+            startUpdating();
+        m_hasEventListener = true;
+    }
+}
+
+void NavigatorGamepad::didRemoveEventListener(DOMWindow*, const AtomicString& eventType)
+{
+    if (eventType == EventTypeNames::gamepadconnected || eventType == EventTypeNames::gamepaddisconnected)
+        m_hasEventListener = false;
+}
+
+void NavigatorGamepad::didRemoveAllEventListeners(DOMWindow*)
+{
+    m_hasEventListener = false;
+}
+
 } // namespace WebCore