1 files changed, 101 insertions, 0 deletions
diff --git a/dom/gamepad/ipc/GamepadEventChannelParent.cpp b/dom/gamepad/ipc/GamepadEventChannelParent.cpp
new file mode 100644
index 000000000..c3c8fd2c8
--- /dev/null
+++ b/dom/gamepad/ipc/GamepadEventChannelParent.cpp
@@ -0,0 +1,101 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+#include "GamepadEventChannelParent.h"
+#include "GamepadPlatformService.h"
+#include "mozilla/dom/GamepadMonitoring.h"
+#include "nsThreadUtils.h"
+
+namespace mozilla {
+namespace dom {
+
+using namespace mozilla::ipc;
+
+namespace {
+
+class SendGamepadUpdateRunnable final : public Runnable
+{
+ private:
+  ~SendGamepadUpdateRunnable() {}
+  RefPtr<GamepadEventChannelParent> mParent;
+  GamepadChangeEvent mEvent;
+ public:
+  SendGamepadUpdateRunnable(GamepadEventChannelParent* aParent,
+                            GamepadChangeEvent aEvent)
+    : mEvent(aEvent)
+  {
+    MOZ_ASSERT(aParent);
+    mParent = aParent;
+  }
+  NS_IMETHOD Run() override
+  {
+    AssertIsOnBackgroundThread();
+    if(mParent->HasGamepadListener()) {
+      Unused << mParent->SendGamepadUpdate(mEvent);
+    }
+    return NS_OK;
+  }
+};
+
+} // namespace
+
+GamepadEventChannelParent::GamepadEventChannelParent()
+  : mHasGamepadListener(false)
+{
+  RefPtr<GamepadPlatformService> service =
+    GamepadPlatformService::GetParentService();
+  MOZ_ASSERT(service);
+  service->AddChannelParent(this);
+  mBackgroundThread = NS_GetCurrentThread();
+}
+
+bool
+GamepadEventChannelParent::RecvGamepadListenerAdded()
+{
+  AssertIsOnBackgroundThread();
+  MOZ_ASSERT(!mHasGamepadListener);
+  mHasGamepadListener = true;
+  StartGamepadMonitoring();
+  return true;
+}
+
+bool
+GamepadEventChannelParent::RecvGamepadListenerRemoved()
+{
+  AssertIsOnBackgroundThread();
+  MOZ_ASSERT(mHasGamepadListener);
+  mHasGamepadListener = false;
+  RefPtr<GamepadPlatformService> service =
+    GamepadPlatformService::GetParentService();
+  MOZ_ASSERT(service);
+  service->RemoveChannelParent(this);
+  Unused << Send__delete__(this);
+  return true;
+}
+
+void
+GamepadEventChannelParent::ActorDestroy(ActorDestroyReason aWhy)
+{
+  AssertIsOnBackgroundThread();
+
+  // It may be called because IPDL child side crashed, we'll
+  // not receive RecvGamepadListenerRemoved in that case
+  if (mHasGamepadListener) {
+    mHasGamepadListener = false;
+    RefPtr<GamepadPlatformService> service =
+      GamepadPlatformService::GetParentService();
+    MOZ_ASSERT(service);
+    service->RemoveChannelParent(this);
+  }
+  MaybeStopGamepadMonitoring();
+}
+
+void
+GamepadEventChannelParent::DispatchUpdateEvent(const GamepadChangeEvent& aEvent)
+{
+  mBackgroundThread->Dispatch(new SendGamepadUpdateRunnable(this, aEvent),
+                              NS_DISPATCH_NORMAL);
+}
+
+} // namespace dom
+} // namespace mozilla