1 files changed, 79 insertions, 0 deletions
diff --git a/dom/vr/VREventObserver.cpp b/dom/vr/VREventObserver.cpp
new file mode 100644
index 000000000..1b6d1b978
--- /dev/null
+++ b/dom/vr/VREventObserver.cpp
@@ -0,0 +1,79 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "VREventObserver.h"
+
+#include "nsContentUtils.h"
+#include "nsGlobalWindow.h"
+#include "VRManagerChild.h"
+
+namespace mozilla {
+namespace dom {
+
+using namespace gfx;
+
+/**
+ * This class is used by nsGlobalWindow to implement window.onvrdisplayconnected,
+ * window.onvrdisplaydisconnected, and window.onvrdisplaypresentchange.
+ */
+VREventObserver::VREventObserver(nsGlobalWindow* aGlobalWindow)
+  : mWindow(aGlobalWindow)
+{
+  MOZ_ASSERT(aGlobalWindow && aGlobalWindow->IsInnerWindow());
+
+  VRManagerChild* vmc = VRManagerChild::Get();
+  if (vmc) {
+    vmc->AddListener(this);
+  }
+}
+
+VREventObserver::~VREventObserver()
+{
+  VRManagerChild* vmc = VRManagerChild::Get();
+  if (vmc) {
+    vmc->RemoveListener(this);
+  }
+}
+
+void
+VREventObserver::NotifyVRDisplayConnect()
+{
+  /**
+   * We do not call nsGlobalWindow::NotifyActiveVRDisplaysChanged here, as we
+   * can assume that a newly enumerated display is not presenting WebVR
+   * content.
+   */
+  if (mWindow->AsInner()->IsCurrentInnerWindow()) {
+    MOZ_ASSERT(nsContentUtils::IsSafeToRunScript());
+    mWindow->GetOuterWindow()->DispatchCustomEvent(
+      NS_LITERAL_STRING("vrdisplayconnected"));
+  }
+}
+
+void
+VREventObserver::NotifyVRDisplayDisconnect()
+{
+  if (mWindow->AsInner()->IsCurrentInnerWindow()) {
+    mWindow->NotifyActiveVRDisplaysChanged();
+    MOZ_ASSERT(nsContentUtils::IsSafeToRunScript());
+    mWindow->GetOuterWindow()->DispatchCustomEvent(
+      NS_LITERAL_STRING("vrdisplaydisconnected"));
+  }
+}
+
+void
+VREventObserver::NotifyVRDisplayPresentChange()
+{
+  if (mWindow->AsInner()->IsCurrentInnerWindow()) {
+    mWindow->NotifyActiveVRDisplaysChanged();
+    MOZ_ASSERT(nsContentUtils::IsSafeToRunScript());
+    mWindow->GetOuterWindow()->DispatchCustomEvent(
+      NS_LITERAL_STRING("vrdisplaypresentchange"));
+  }
+}
+
+} // namespace dom
+} // namespace mozilla