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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 http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_MIDIPort_h
#define mozilla_dom_MIDIPort_h
#include "nsWrapperCache.h"
#include "mozilla/Attributes.h"
#include "mozilla/Observer.h"
#include "mozilla/DOMEventTargetHelper.h"
#include "mozilla/dom/MIDIAccess.h"
#include "mozilla/dom/MIDIPortChild.h"
#include "mozilla/dom/MIDIPortInterface.h"
struct JSContext;
namespace mozilla::dom {
class Promise;
class MIDIPortInfo;
class MIDIAccess;
class MIDIPortChangeEvent;
class MIDIPortChild;
class MIDIMessage;
/**
* Implementation of WebIDL DOM MIDIPort class. Handles all port representation
* and communication.
*
*/
class MIDIPort : public DOMEventTargetHelper,
public MIDIAccessDestructionObserver {
public:
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(MIDIPort,
DOMEventTargetHelper)
protected:
explicit MIDIPort(nsPIDOMWindowInner* aWindow);
bool Initialize(const MIDIPortInfo& aPortInfo, bool aSysexEnabled,
MIDIAccess* aMIDIAccessParent);
virtual ~MIDIPort();
public:
nsPIDOMWindowInner* GetParentObject() const { return GetOwner(); }
// Getters
void GetId(nsString& aRetVal) const;
void GetManufacturer(nsString& aRetVal) const;
void GetName(nsString& aRetVal) const;
void GetVersion(nsString& aRetVal) const;
MIDIPortType Type() const;
MIDIPortConnectionState Connection() const;
MIDIPortDeviceState State() const;
bool SysexEnabled() const;
already_AddRefed<Promise> Open(ErrorResult& aError);
already_AddRefed<Promise> Close(ErrorResult& aError);
// MIDIPorts observe the death of their parent MIDIAccess object, and delete
// their reference accordingly.
virtual void Notify(const void_t& aVoid) override;
void FireStateChangeEvent();
virtual void StateChange();
virtual void Receive(const nsTArray<MIDIMessage>& aMsg);
// This object holds a pointer to its corresponding IPC MIDIPortChild actor.
// If the IPC actor is deleted, it cleans itself up via this method.
void UnsetIPCPort();
IMPL_EVENT_HANDLER(statechange)
void DisconnectFromOwner() override;
const nsString& StableId();
protected:
// Helper class to ensure we always call DetachOwner when we drop the
// reference to the the port.
class PortHolder {
public:
void Init(already_AddRefed<MIDIPortChild> aArg) {
MOZ_ASSERT(!mInner);
mInner = aArg;
}
void Clear() {
if (mInner) {
mInner->DetachOwner();
mInner = nullptr;
}
}
~PortHolder() { Clear(); }
MIDIPortChild* Get() const { return mInner; }
private:
RefPtr<MIDIPortChild> mInner;
};
// IPC Actor corresponding to this class.
PortHolder mPortHolder;
MIDIPortChild* Port() const { return mPortHolder.Get(); }
private:
void KeepAliveOnStatechange();
void DontKeepAliveOnStatechange();
// MIDIAccess object that created this MIDIPort object, which we need for
// firing port connection events. There is a chance this MIDIPort object can
// outlive its parent MIDIAccess object, so this is a weak reference that must
// be handled properly. It is set on construction of the MIDIPort object, and
// set to null when the parent MIDIAccess object is destroyed, which fires an
// notification we observe.
MIDIAccess* mMIDIAccessParent;
// Promise object generated on Open() call, that needs to be resolved once the
// platform specific Open() function has completed.
RefPtr<Promise> mOpeningPromise;
// Promise object generated on Close() call, that needs to be resolved once
// the platform specific Close() function has completed.
RefPtr<Promise> mClosingPromise;
// If true this object will be kept alive even without direct JS references
bool mKeepAlive;
};
} // namespace mozilla::dom
#endif // mozilla_dom_MIDIPort_h
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