1 files changed, 102 insertions, 0 deletions
diff --git a/dom/midi/MIDIInput.cpp b/dom/midi/MIDIInput.cpp
new file mode 100644
index 0000000000..011a58444e
--- /dev/null
+++ b/dom/midi/MIDIInput.cpp
@@ -0,0 +1,102 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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/MIDIInput.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/MIDIPortChild.h"
+#include "mozilla/dom/MIDIInputBinding.h"
+#include "mozilla/dom/MIDIMessageEvent.h"
+#include "mozilla/dom/MIDIMessageEventBinding.h"
+#include "nsDOMNavigationTiming.h"
+
+#include "MIDILog.h"
+
+namespace mozilla::dom {
+
+MIDIInput::MIDIInput(nsPIDOMWindowInner* aWindow)
+    : MIDIPort(aWindow), mKeepAlive(false) {}
+
+// static
+RefPtr<MIDIInput> MIDIInput::Create(nsPIDOMWindowInner* aWindow,
+                                    MIDIAccess* aMIDIAccessParent,
+                                    const MIDIPortInfo& aPortInfo,
+                                    const bool aSysexEnabled) {
+  MOZ_ASSERT(static_cast<MIDIPortType>(aPortInfo.type()) ==
+             MIDIPortType::Input);
+  RefPtr<MIDIInput> port = new MIDIInput(aWindow);
+  if (!port->Initialize(aPortInfo, aSysexEnabled, aMIDIAccessParent)) {
+    return nullptr;
+  }
+  return port;
+}
+
+JSObject* MIDIInput::WrapObject(JSContext* aCx,
+                                JS::Handle<JSObject*> aGivenProto) {
+  return MIDIInput_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+void MIDIInput::Receive(const nsTArray<MIDIMessage>& aMsgs) {
+  if (!GetOwner()) {
+    return;  // Ignore messages once we've been disconnected from the owner
+  }
+
+  nsCOMPtr<Document> doc = GetOwner()->GetDoc();
+  if (!doc) {
+    NS_WARNING("No document available to send MIDIMessageEvent to!");
+    return;
+  }
+  for (const auto& msg : aMsgs) {
+    RefPtr<MIDIMessageEvent> event(
+        MIDIMessageEvent::Constructor(this, msg.timestamp(), msg.data()));
+    DispatchTrustedEvent(event);
+  }
+}
+
+void MIDIInput::StateChange() {
+  if (Port()->ConnectionState() == MIDIPortConnectionState::Open ||
+      (Port()->DeviceState() == MIDIPortDeviceState::Connected &&
+       Port()->ConnectionState() == MIDIPortConnectionState::Pending)) {
+    KeepAliveOnMidimessage();
+  } else {
+    DontKeepAliveOnMidimessage();
+  }
+}
+
+void MIDIInput::EventListenerAdded(nsAtom* aType) {
+  if (aType == nsGkAtoms::onmidimessage) {
+    // HACK: the Web MIDI spec states that we should open a port only when
+    // setting the midimessage event handler but Chrome does it even when
+    // adding event listeners hence this.
+    if (Port()->ConnectionState() != MIDIPortConnectionState::Open) {
+      LOG("onmidimessage event listener added, sending implicit Open");
+      Port()->SendOpen();
+    }
+  }
+
+  DOMEventTargetHelper::EventListenerAdded(aType);
+}
+
+void MIDIInput::DisconnectFromOwner() {
+  DontKeepAliveOnMidimessage();
+
+  MIDIPort::DisconnectFromOwner();
+}
+
+void MIDIInput::KeepAliveOnMidimessage() {
+  if (!mKeepAlive) {
+    mKeepAlive = true;
+    KeepAliveIfHasListenersFor(nsGkAtoms::onmidimessage);
+  }
+}
+
+void MIDIInput::DontKeepAliveOnMidimessage() {
+  if (mKeepAlive) {
+    IgnoreKeepAliveIfHasListenersFor(nsGkAtoms::onmidimessage);
+    mKeepAlive = false;
+  }
+}
+
+}  // namespace mozilla::dom