/*
* 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;
namespace Tizen.Multimedia
{
///
/// Provides the ability to control the volume levels.
///
///
public class AudioVolume
{
private const string Tag = "Tizen.Multimedia.AudioVolume";
private int _volumeChangedCallbackId = -1;
private EventHandler _volumeChanged;
private Interop.AudioVolume.VolumeChangedCallback _volumeChangedCallback;
private object _eventLock = new object();
internal AudioVolume()
{
Level = new VolumeLevel();
MaxLevel = new MaxVolumeLevel();
}
///
/// Occurs when the volume level is changed.
///
public event EventHandler Changed
{
add
{
lock (_eventLock)
{
if (_volumeChanged == null)
{
RegisterVolumeChangedEvent();
}
_volumeChanged += value;
}
}
remove
{
if (value == null)
{
return;
}
lock (_eventLock)
{
if (_volumeChanged == value)
{
UnregisterVolumeChangedEvent();
}
_volumeChanged -= value;
}
}
}
///
/// Gets the volume type of the sound being currently played.
///
/// The volume type of the sound being currently played.
public AudioVolumeType CurrentPlaybackType
{
get
{
var ret = Interop.AudioVolume.GetCurrentSoundType(out var currentType);
if (ret == AudioManagerError.NoPlayingSound)
{
return AudioVolumeType.None;
}
ret.Validate("Failed to get current volume type");
return currentType;
}
}
///
/// Gets the .
///
/// The .
public VolumeLevel Level { get; }
///
/// Gets the .
///
/// The .
public MaxVolumeLevel MaxLevel { get; }
private void RegisterVolumeChangedEvent()
{
_volumeChangedCallback = (AudioVolumeType type, uint volume, IntPtr userData) =>
{
_volumeChanged?.Invoke(this, new VolumeChangedEventArgs(type, volume));
};
var error = Interop.AudioVolume.AddVolumeChangedCallback(_volumeChangedCallback, IntPtr.Zero,
out _volumeChangedCallbackId);
Log.Info(Tag, $"VolumeController callback id:{_volumeChangedCallbackId}");
error.Validate("Failed to add volume changed event");
}
private void UnregisterVolumeChangedEvent()
{
Interop.AudioVolume.RemoveVolumeChangedCallback(_volumeChangedCallbackId).
Validate("Failed to remove volume changed event");
}
}
}