1 files changed, 169 insertions, 0 deletions
diff --git a/dom/vr/XRInputSourceArray.cpp b/dom/vr/XRInputSourceArray.cpp
new file mode 100644
index 0000000000..acea871097
--- /dev/null
+++ b/dom/vr/XRInputSourceArray.cpp
@@ -0,0 +1,169 @@
+/* -*- 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 "mozilla/dom/XRInputSourceArray.h"
+#include "mozilla/dom/XRSession.h"
+#include "mozilla/dom/XRInputSourcesChangeEvent.h"
+#include "VRDisplayClient.h"
+
+namespace mozilla {
+namespace dom {
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(XRInputSourceArray, mParent,
+                                      mInputSources)
+NS_IMPL_CYCLE_COLLECTING_ADDREF(XRInputSourceArray)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(XRInputSourceArray)
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(XRInputSourceArray)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+XRInputSourceArray::XRInputSourceArray(nsISupports* aParent)
+    : mParent(aParent) {}
+
+JSObject* XRInputSourceArray::WrapObject(JSContext* aCx,
+                                         JS::Handle<JSObject*> aGivenProto) {
+  return XRInputSourceArray_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+void XRInputSourceArray::Update(XRSession* aSession) {
+  MOZ_ASSERT(aSession);
+
+  gfx::VRDisplayClient* displayClient = aSession->GetDisplayClient();
+  if (!displayClient) {
+    return;
+  }
+
+  XRInputSourcesChangeEventInit addInit;
+  nsTArray<RefPtr<XRInputSource>> removedInputs;
+  if (NS_WARN_IF(!addInit.mAdded.SetCapacity(gfx::kVRControllerMaxCount,
+                                             mozilla::fallible))) {
+    MOZ_ASSERT(false,
+               "'add' sequence in XRInputSourcesChangeEventInit SetCapacity() "
+               "failed.");
+    return;
+  }
+
+  for (int32_t i = 0; i < gfx::kVRControllerMaxCount; ++i) {
+    const gfx::VRControllerState& controllerState =
+        displayClient->GetDisplayInfo().mControllerState[i];
+    if (controllerState.controllerName[0] == '\0') {
+      // Checking if exising controllers need to be removed.
+      for (auto& input : mInputSources) {
+        if (input->GetIndex() == i) {
+          removedInputs.AppendElement(input);
+          break;
+        }
+      }
+      continue;
+    }
+
+    bool found = false;
+    RefPtr<XRInputSource> inputSource = nullptr;
+    for (auto& input : mInputSources) {
+      if (input->GetIndex() == i) {
+        found = true;
+        inputSource = input;
+        break;
+      }
+    }
+    // Checking if it is added before.
+    if (!found &&
+        (controllerState.numButtons > 0 || controllerState.numAxes > 0)) {
+      inputSource = new XRInputSource(mParent);
+      inputSource->Setup(aSession, i);
+      mInputSources.AppendElement(inputSource);
+
+      addInit.mBubbles = false;
+      addInit.mCancelable = false;
+      addInit.mSession = aSession;
+      if (!addInit.mAdded.AppendElement(*inputSource, mozilla::fallible)) {
+        MOZ_ASSERT(false,
+                   "'add' sequence in XRInputSourcesChangeEventInit "
+                   "AppendElement() failed, it might be due to the"
+                   "wrong size when SetCapacity().");
+      }
+    }
+    // If added, updating the current controller states.
+    if (inputSource) {
+      inputSource->Update(aSession);
+    }
+  }
+
+  // Send `inputsourceschange` for new controllers.
+  if (addInit.mAdded.Length()) {
+    RefPtr<XRInputSourcesChangeEvent> event =
+        XRInputSourcesChangeEvent::Constructor(
+            aSession, u"inputsourceschange"_ns, addInit);
+
+    event->SetTrusted(true);
+    aSession->DispatchEvent(*event);
+  }
+
+  // If there's a controller is removed, dispatch `inputsourceschange`.
+  if (removedInputs.Length()) {
+    DispatchInputSourceRemovedEvent(removedInputs, aSession);
+  }
+  for (auto& input : removedInputs) {
+    mInputSources.RemoveElement(input);
+  }
+}
+
+void XRInputSourceArray::DispatchInputSourceRemovedEvent(
+    const nsTArray<RefPtr<XRInputSource>>& aInputs, XRSession* aSession) {
+  if (!aSession) {
+    return;
+  }
+
+  XRInputSourcesChangeEventInit init;
+  if (NS_WARN_IF(
+          !init.mRemoved.SetCapacity(aInputs.Length(), mozilla::fallible))) {
+    MOZ_ASSERT(false,
+               "'removed' sequence in XRInputSourcesChangeEventInit "
+               "SetCapacity() failed.");
+    return;
+  }
+  for (const auto& input : aInputs) {
+    input->SetGamepadIsConnected(false, aSession);
+    init.mBubbles = false;
+    init.mCancelable = false;
+    init.mSession = aSession;
+    if (!init.mRemoved.AppendElement(*input, mozilla::fallible)) {
+      MOZ_ASSERT(false,
+                 "'removed' sequence in XRInputSourcesChangeEventInit "
+                 "AppendElement() failed, it might be due to the"
+                 "wrong size when SetCapacity().");
+    }
+  }
+
+  if (init.mRemoved.Length()) {
+    RefPtr<XRInputSourcesChangeEvent> event =
+        XRInputSourcesChangeEvent::Constructor(aSession,
+                                               u"inputsourceschange"_ns, init);
+
+    event->SetTrusted(true);
+    aSession->DispatchEvent(*event);
+  }
+}
+
+void XRInputSourceArray::Clear(XRSession* aSession) {
+  DispatchInputSourceRemovedEvent(mInputSources, aSession);
+  mInputSources.Clear();
+}
+
+uint32_t XRInputSourceArray::Length() { return mInputSources.Length(); }
+
+XRInputSource* XRInputSourceArray::IndexedGetter(uint32_t aIndex,
+                                                 bool& aFound) {
+  aFound = aIndex < mInputSources.Length();
+  if (!aFound) {
+    return nullptr;
+  }
+  return mInputSources[aIndex];
+}
+
+}  // namespace dom
+}  // namespace mozilla