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