1 files changed, 76 insertions, 0 deletions
diff --git a/dom/midi/MIDIAccessManager.h b/dom/midi/MIDIAccessManager.h
new file mode 100644
index 0000000000..606c73d268
--- /dev/null
+++ b/dom/midi/MIDIAccessManager.h
@@ -0,0 +1,76 @@
+/* -*- 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/. */
+
+#ifndef mozilla_dom_MIDIAccessManager_h
+#define mozilla_dom_MIDIAccessManager_h
+
+#include "nsPIDOMWindow.h"
+#include "mozilla/dom/MIDITypes.h"
+#include "mozilla/Observer.h"
+
+namespace mozilla::dom {
+
+class MIDIAccess;
+class MIDIManagerChild;
+struct MIDIOptions;
+class MIDIPortChangeEvent;
+class MIDIPortInfo;
+class Promise;
+
+/**
+ * MIDIAccessManager manages creation and lifetime of MIDIAccess objects for the
+ * process it lives in. It is in charge of dealing with permission requests,
+ * creating new MIDIAccess objects, and updating live MIDIAccess objects with
+ * new device listings.
+ *
+ * While a process/window can have many MIDIAccess objects, there is only one
+ * MIDIAccessManager for any one process.
+ */
+class MIDIAccessManager final {
+ public:
+  NS_INLINE_DECL_REFCOUNTING(MIDIAccessManager);
+  // Handles requests from Navigator for MIDI permissions and MIDIAccess
+  // creation.
+  already_AddRefed<Promise> RequestMIDIAccess(nsPIDOMWindowInner* aWindow,
+                                              const MIDIOptions& aOptions,
+                                              ErrorResult& aRv);
+  // Creates a new MIDIAccess object
+  void CreateMIDIAccess(nsPIDOMWindowInner* aWindow, bool aNeedsSysex,
+                        Promise* aPromise);
+  // Getter for manager singleton
+  static MIDIAccessManager* Get();
+  // True if manager singleton has been created
+  static bool IsRunning();
+  // Send device connection updates to all known MIDIAccess objects.
+  void Update(const MIDIPortList& aPortList);
+  // Adds a device update observer (usually a MIDIAccess object)
+  bool AddObserver(Observer<MIDIPortList>* aObserver);
+  // Removes a device update observer (usually a MIDIAccess object)
+  void RemoveObserver(Observer<MIDIPortList>* aObserver);
+  // Requests the service to update the list of devices
+  void SendRefresh();
+
+ private:
+  MIDIAccessManager();
+  ~MIDIAccessManager();
+  void StartActor();
+  // True if object has received a device list from the MIDI platform service.
+  bool mHasPortList;
+  // List of known ports for the system.
+  MIDIPortList mPortList;
+  // Holds MIDIAccess objects until we've received the first list of devices
+  // from the MIDI Service.
+  nsTArray<RefPtr<MIDIAccess>> mAccessHolder;
+  // Device state update observers (usually MIDIAccess objects)
+  ObserverList<MIDIPortList> mChangeObservers;
+  // IPC Object for MIDIManager. Created on first MIDIAccess object creation,
+  // destroyed on last MIDIAccess object destruction.
+  RefPtr<MIDIManagerChild> mChild;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_MIDIAccessManager_h