зеркало из https://github.com/mozilla/gecko-dev.git
77 строки
2.8 KiB
C
77 строки
2.8 KiB
C
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_MIDIAccessManager_h
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#define mozilla_dom_MIDIAccessManager_h
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#include "nsPIDOMWindow.h"
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#include "nsIObserver.h"
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#include "mozilla/dom/MIDITypes.h"
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#include "mozilla/Observer.h"
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namespace mozilla {
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namespace dom {
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class MIDIAccess;
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class MIDIManagerChild;
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struct MIDIOptions;
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class MIDIPortChangeEvent;
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class MIDIPortInfo;
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class Promise;
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/**
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* MIDIAccessManager manages creation and lifetime of MIDIAccess objects for the
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* process it lives in. It is in charge of dealing with permission requests,
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* creating new MIDIAccess objects, and updating live MIDIAccess objects with
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* new device listings.
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*
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* While a process/window can have many MIDIAccess objects, there is only one
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* MIDIAccessManager for any one process.
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*/
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class MIDIAccessManager final {
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public:
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NS_INLINE_DECL_REFCOUNTING(MIDIAccessManager);
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// Handles requests from Navigator for MIDI permissions and MIDIAccess
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// creation.
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already_AddRefed<Promise> RequestMIDIAccess(nsPIDOMWindowInner* aWindow,
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const MIDIOptions& aOptions,
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ErrorResult& aRv);
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// Creates a new MIDIAccess object
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void CreateMIDIAccess(nsPIDOMWindowInner* aWindow, bool aNeedsSysex,
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Promise* aPromise);
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// Getter for manager singleton
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static MIDIAccessManager* Get();
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// True if manager singleton has been created
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static bool IsRunning();
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// Send device connection updates to all known MIDIAccess objects.
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void Update(const MIDIPortList& aEvent);
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// Adds a device update observer (usually a MIDIAccess object)
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bool AddObserver(Observer<MIDIPortList>* aObserver);
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// Removes a device update observer (usually a MIDIAccess object)
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void RemoveObserver(Observer<MIDIPortList>* aObserver);
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private:
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MIDIAccessManager();
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~MIDIAccessManager();
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// True if object has received a device list from the MIDI platform service.
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bool mHasPortList;
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// List of known ports for the system.
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MIDIPortList mPortList;
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// Holds MIDIAccess objects until we've received the first list of devices
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// from the MIDI Service.
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nsTArray<RefPtr<MIDIAccess>> mAccessHolder;
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// Device state update observers (usually MIDIAccess objects)
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ObserverList<MIDIPortList> mChangeObservers;
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// IPC Object for MIDIManager. Created on first MIDIAccess object creation,
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// destroyed on last MIDIAccess object destruction.
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RefPtr<MIDIManagerChild> mChild;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_MIDIAccessManager_h
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