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/* -*- 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 */
#ifndef mozilla_dom_MIDIAccessManager_h
#define mozilla_dom_MIDIAccessManager_h
#include "nsPIDOMWindow.h"
#include "mozilla/dom/MIDITypes.h"
#include "mozilla/Observer.h"
namespace mozilla {
namespace 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 {
// 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& aEvent);
// 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);
// 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 dom
} // namespace mozilla
#endif // mozilla_dom_MIDIAccessManager_h