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/*
* Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
*
* Licensed under the Apache License, Version 2.0 (the License);
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
using System.Runtime.InteropServices;
using System.Collections.Generic;
using Tizen.Network;
namespace Tizen.Network.Nfc
{
/// <summary>
/// A class for NFC Tag mode. It allows applications to handle Tag informations.
/// </summary>
/// <privilege>http://tizen.org/privilege/nfc</privilege>
public class NfcTagAdapter : IDisposable
{
private NfcTag _tag;
private bool disposed = false;
private event EventHandler<TagDiscoveredEventArgs> _tagDiscovered;
private Interop.Nfc.TagDiscoveredCallback _tagDiscoveredCallback;
/// <summary>
/// The event for receiving tag discovered notification.
/// </summary>
public event EventHandler<TagDiscoveredEventArgs> TagDiscovered
{
add
{
if (_tagDiscovered == null)
{
RegisterTagDiscoveredEvent();
}
_tagDiscovered += value;
}
remove
{
_tagDiscovered -= value;
if (_tagDiscovered == null)
{
UnregisterTagDiscoveredEvent();
}
}
}
internal NfcTagAdapter()
{
}
~NfcTagAdapter()
{
Dispose(false);
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
private void Dispose(bool disposing)
{
if (disposed)
return;
if (disposing)
{
// Free managed objects.
}
//Free unmanaged objects
disposed = true;
}
/// <summary>
/// Gets current connected tag.
/// </summary>
/// <returns>NfcTag object.</returns>
public NfcTag GetConnectedTag()
{
IntPtr tagHandle = IntPtr.Zero;
int ret = Interop.Nfc.GetConnectedTag(out tagHandle);
if (ret != (int)NfcError.None)
{
Log.Error(Globals.LogTag, "Failed to get connected tag, Error - " + (NfcError)ret);
NfcErrorFactory.ThrowNfcException(ret);
}
_tag = new NfcTag(tagHandle);
return _tag;
}
private void RegisterTagDiscoveredEvent()
{
_tagDiscoveredCallback = (int type, IntPtr tagHandle, IntPtr userData) =>
{
NfcDiscoveredType tagType = (NfcDiscoveredType)type;
TagDiscoveredEventArgs e = new TagDiscoveredEventArgs(tagType, tagHandle);
_tagDiscovered.SafeInvoke(null, e);
};
int ret = Interop.Nfc.SetTagDiscoveredCallback(_tagDiscoveredCallback, IntPtr.Zero);
if (ret != (int)NfcError.None)
{
Log.Error(Globals.LogTag, "Failed to set tag discovered callback, Error - " + (NfcError)ret);
}
}
private void UnregisterTagDiscoveredEvent()
{
Interop.Nfc.UnsetTagDiscoveredCallback();
}
}
}
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