1 files changed, 116 insertions, 0 deletions
diff --git a/dom/midi/MIDIAccess.h b/dom/midi/MIDIAccess.h
new file mode 100644
index 0000000000..99071aa526
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+++ b/dom/midi/MIDIAccess.h
@@ -0,0 +1,116 @@
+/* -*- 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_MIDIAccess_h
+#define mozilla_dom_MIDIAccess_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/DOMEventTargetHelper.h"
+#include "mozilla/Observer.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsWrapperCache.h"
+
+struct JSContext;
+
+namespace mozilla {
+class ErrorResult;
+
+// Predeclare void_t here, as including IPCMessageUtils brings in windows.h and
+// causes binding compilation problems.
+struct void_t;
+
+namespace dom {
+
+class MIDIAccessManager;
+class MIDIInputMap;
+struct MIDIOptions;
+class MIDIOutputMap;
+class MIDIPermissionRequest;
+class MIDIPort;
+class MIDIPortChangeEvent;
+class MIDIPortInfo;
+class MIDIPortList;
+class Promise;
+
+typedef Observer<void_t> MIDIAccessDestructionObserver;
+
+/**
+ * MIDIAccess is the DOM object that is handed to the user upon MIDI permissions
+ * being successfully granted. It manages access to MIDI ports, and fires events
+ * for device connection and disconnection.
+ *
+ * New MIDIAccess objects are created every time RequestMIDIAccess is called.
+ * MIDIAccess objects are managed via MIDIAccessManager.
+ */
+class MIDIAccess final : public DOMEventTargetHelper,
+                         public Observer<MIDIPortList> {
+  // Use the Permission Request class in MIDIAccessManager for creating
+  // MIDIAccess objects.
+  friend class MIDIPermissionRequest;
+  friend class MIDIAccessManager;
+
+ public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(MIDIAccess,
+                                                         DOMEventTargetHelper)
+ public:
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  // Return map of MIDI Input Ports
+  MIDIInputMap* Inputs() const { return mInputMap; }
+
+  // Return map of MIDI Output Ports
+  MIDIOutputMap* Outputs() const { return mOutputMap; }
+
+  // Returns true if sysex permissions were given
+  bool SysexEnabled() const { return mSysexEnabled; }
+
+  // Observer implementation for receiving port connection updates
+  void Notify(const MIDIPortList& aEvent) override;
+
+  // All MIDIPort objects observe destruction of the MIDIAccess object that
+  // created them, as the port object receives disconnection events which then
+  // must be passed up to the MIDIAccess object. If the Port object dies before
+  // the MIDIAccess object, it needs to be removed from the observer list.
+  void RemovePortListener(MIDIAccessDestructionObserver* aPort);
+
+  // Fires DOM event on port connection/disconnection
+  void FireConnectionEvent(MIDIPort* aPort);
+
+  // Notify all MIDIPorts that were created by this MIDIAccess and are still
+  // alive, and detach from the MIDIAccessManager.
+  void Shutdown();
+  IMPL_EVENT_HANDLER(statechange);
+
+ private:
+  MIDIAccess(nsPIDOMWindowInner* aWindow, bool aSysexEnabled,
+             Promise* aAccessPromise);
+  ~MIDIAccess();
+
+  // On receiving a connection event from MIDIAccessManager, create a
+  // corresponding MIDIPort object if we don't already have one.
+  void MaybeCreateMIDIPort(const MIDIPortInfo& aInfo, ErrorResult& aRv);
+
+  // Stores all known MIDIInput Ports
+  RefPtr<MIDIInputMap> mInputMap;
+  // Stores all known MIDIOutput Ports
+  RefPtr<MIDIOutputMap> mOutputMap;
+  // List of MIDIPort observers that need to be updated on destruction.
+  ObserverList<void_t> mDestructionObservers;
+  // True if user gave permissions for sysex usage to this object.
+  bool mSysexEnabled;
+  // Promise created by RequestMIDIAccess call, to be resolved after port
+  // populating is finished.
+  RefPtr<Promise> mAccessPromise;
+  // True if shutdown process has started, so we don't try to add more ports.
+  bool mHasShutdown;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_MIDIAccess_h