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Quellcode

<Slider DockPanel.Dock="Top" Value="{Binding CurrentTime}" Maximum="{Binding CurrentChannelLength}" />

C#-Quelltext

public class PlayerViewModel:DependencyObject
    {
        //...

        private AudioPlayer player;
        public AudioPlayer Player { get { return player; } }

        public PlayerViewModel()
        {
            player = new AudioPlayer();
            player.PropertyChanged += player_PropertyChanged;

            //...
        }

        void player_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
            if (e.PropertyName.Equals("CurrentChannelPosition"))
            {
                CurrentTime = player.CurrentChannelPosition;
            }
            else if(e.PropertyName.Equals("CurrentChannelLength"))
            {
                CurrentChannelLength = player.CurrentChannelLength;
            }
        }

        public static readonly DependencyProperty CurrentTimeProperty = DependencyProperty.Register("CurrentTime",
            typeof(long), typeof(PlayerViewModel),
            new PropertyMetadata(setCurrentTime));

        private static void setCurrentTime(DependencyObject o, DependencyPropertyChangedEventArgs e)
        {
            (o as PlayerViewModel).player.SetChannelPosition((long)e.NewValue);
        }

        public long CurrentTime
        {
            get { return (long)GetValue(CurrentTimeProperty); }
            set { SetValue(CurrentTimeProperty, value); }
        }

        public static readonly DependencyProperty CurrentChannelLengthProperty = DependencyProperty.Register("CurrentChannelLength", typeof(long), typeof(PlayerViewModel));
        public long CurrentChannelLength
        {
            get { return (long)GetValue(CurrentChannelLengthProperty); }
            set { SetValue(CurrentChannelLengthProperty, value); }
        }

        //...
    }

C#-Quelltext

public class AudioPlayer:INotifyPropertyChanged
    {

        //....

        private DispatcherTimer positionTimer;
        private long currentChannelPosition;
        private long currentChannelLength;
        public long CurrentChannelPosition { get { return currentChannelPosition; } set { currentChannelPosition = value; NotifyPropertyChanged("CurrentChannelPosition"); } }
        public long CurrentChannelLength { get { return currentChannelLength; } set { currentChannelLength = value; NotifyPropertyChanged("CurrentChannelLength"); } }

        //...

        private int currentStreamHandle;
        public int CurrentStreamHandle
        {
            get { return currentStreamHandle; }
            set { currentStreamHandle = value; }
        }

        public AudioPlayer()
        {
            positionTimer = new DispatcherTimer(DispatcherPriority.ApplicationIdle);
            positionTimer.Interval = TimeSpan.FromMilliseconds(100);
            positionTimer.Tick += positionTimerTick;
            positionTimer.IsEnabled = true;

           //...
        }

        //...

        public void SetChannelPosition(long position)
        {
            CurrentChannelPosition = Math.Max(0, Math.Min(position, CurrentChannelLength));
            Bass.BASS_ChannelSetPosition(CurrentStreamHandle, Math.Max(0, Math.Min(position, CurrentChannelLength)));
        }

        public event PropertyChangedEventHandler PropertyChanged;

        private void NotifyPropertyChanged(String info)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(info));
            }
        }
    }