root/Source/modules/webmidi/MIDIAccess.h

INCLUDED FROM

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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#ifndef MIDIAccess_h
#define MIDIAccess_h

#include "bindings/v8/MIDIAccessResolver.h"
#include "bindings/v8/ScriptPromise.h"
#include "bindings/v8/ScriptWrappable.h"
#include "core/dom/ActiveDOMObject.h"
#include "core/events/EventTarget.h"
#include "heap/Handle.h"
#include "modules/webmidi/MIDIAccessor.h"
#include "modules/webmidi/MIDIAccessorClient.h"
#include "modules/webmidi/MIDIInput.h"
#include "modules/webmidi/MIDIOptions.h"
#include "modules/webmidi/MIDIOutput.h"
#include "platform/AsyncMethodRunner.h"
#include "wtf/RefCounted.h"
#include "wtf/RefPtr.h"
#include "wtf/WeakPtr.h"

namespace WebCore {

class ExecutionContext;

class MIDIAccess FINAL : public RefCountedWillBeRefCountedGarbageCollected<MIDIAccess>, public ScriptWrappable, public ActiveDOMObject, public EventTargetWithInlineData, public MIDIAccessorClient {
    DEFINE_EVENT_TARGET_REFCOUNTING(RefCountedWillBeRefCountedGarbageCollected<MIDIAccess>);
public:
    virtual ~MIDIAccess();
    // Returns a promise object that will be resolved with this MIDIAccess.
    static ScriptPromise request(const MIDIOptions&, ExecutionContext*);

    MIDIInputVector inputs() const { return m_inputs; }
    MIDIOutputVector outputs() const { return m_outputs; }

    DEFINE_ATTRIBUTE_EVENT_LISTENER(connect);
    DEFINE_ATTRIBUTE_EVENT_LISTENER(disconnect);

    void setSysexEnabled(bool);
    bool sysexEnabled() const { return m_sysexEnabled; }

    // EventTarget
    virtual const AtomicString& interfaceName() const OVERRIDE { return EventTargetNames::MIDIAccess; }
    virtual ExecutionContext* executionContext() const OVERRIDE { return ActiveDOMObject::executionContext(); }

    // ActiveDOMObject
    virtual void suspend() OVERRIDE;
    virtual void resume() OVERRIDE;
    virtual void stop() OVERRIDE;
    virtual bool hasPendingActivity() const OVERRIDE;

    // MIDIAccessorClient
    virtual void didAddInputPort(const String& id, const String& manufacturer, const String& name, const String& version) OVERRIDE;
    virtual void didAddOutputPort(const String& id, const String& manufacturer, const String& name, const String& version) OVERRIDE;
    virtual void didStartSession(bool success) OVERRIDE;
    virtual void didReceiveMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStamp) OVERRIDE;

    // |timeStampInMilliseconds| is in the same time coordinate system as performance.now().
    void sendMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStampInMilliseconds);

    void trace(Visitor*);

private:
    class PostAction;
    enum State {
        Requesting,
        Resolved,
        Stopped,
    };

    MIDIAccess(const MIDIOptions&, ExecutionContext*);
    ScriptPromise startRequest();

    void permissionDenied();

    void resolve();
    void reject(PassRefPtrWillBeRawPtr<DOMError>);
    void resolveNow();
    void rejectNow();
    // Called when the promise is resolved or rejected.
    void doPostAction(State);

    State m_state;
    WeakPtrFactory<MIDIAccess> m_weakPtrFactory;
    MIDIInputVector m_inputs;
    MIDIOutputVector m_outputs;
    OwnPtr<MIDIAccessor> m_accessor;
    OwnPtr<MIDIAccessResolver> m_resolver;
    MIDIOptions m_options;
    bool m_sysexEnabled;
    AsyncMethodRunner<MIDIAccess> m_asyncResolveRunner;
    AsyncMethodRunner<MIDIAccess> m_asyncRejectRunner;
    RefPtrWillBeMember<DOMError> m_error;
};

} // namespace WebCore

#endif // MIDIAccess_h