Web MIDI: implement MIDIAccess

Source/modules/webmidi/MIDIAccess.h

+/*
+ * Copyright (C) 2013 Google Inc. All rights reserved.
+ *
+ * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * 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
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef MIDIAccess_h
+#define MIDIAccess_h
+
+#include "core/dom/ActiveDOMObject.h"
+#include "core/dom/EventTarget.h"
+#include "modules/webmidi/MIDIInput.h"
+#include "modules/webmidi/MIDIOutput.h"
+#include "wtf/RefCounted.h"
+#include "wtf/RefPtr.h"
+#include "wtf/Vector.h"
+
+namespace WebCore {
+
+class ScriptExecutionContext;
+
+class MIDIAccess : public ActiveDOMObject, public RefCounted<MIDIAccess>, public EventTarget {
+public:
+    virtual ~MIDIAccess();
+    static PassRefPtr<MIDIAccess> create(ScriptExecutionContext*);
+
+    MIDIInputVector inputs() const { return m_inputs; }
+    MIDIOutputVector outputs() const { return m_outputs; }
+
+    using RefCounted<MIDIAccess>::ref;
+    using RefCounted<MIDIAccess>::deref;
+
+    DEFINE_ATTRIBUTE_EVENT_LISTENER(connect);
+    DEFINE_ATTRIBUTE_EVENT_LISTENER(disconnect);
+
+    // EventTarget
+    virtual const AtomicString& interfaceName() const OVERRIDE { return eventNames().interfaceForMIDIAccess; }
+    virtual ScriptExecutionContext* scriptExecutionContext() const OVERRIDE { return ActiveDOMObject::scriptExecutionContext(); }
+
+    // ActiveDOMObject
+    virtual bool canSuspend() const OVERRIDE { return true; }
+
+private:
+    explicit MIDIAccess(ScriptExecutionContext*);
+
+    // EventTarget
+    virtual void refEventTarget() OVERRIDE { ref(); }
+    virtual void derefEventTarget() OVERRIDE { deref(); }
+    virtual EventTargetData* eventTargetData() OVERRIDE { return &m_eventTargetData; }
+    virtual EventTargetData* ensureEventTargetData() OVERRIDE { return &m_eventTargetData; }
+
+    MIDIInputVector m_inputs;
+    MIDIOutputVector m_outputs;
+    EventTargetData m_eventTargetData;
+};
+
+} // namespace WebCore
+
+#endif // MIDIAccess_h