Синхронизация MediaPlayer со слайдером - C# WPF - Ответ 326373

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Threading;
 
namespace C4L2
{
  /// <summary>
  /// Interaction logic for Window1.xaml
  /// </summary>
  public class MyMediaPlayer
  {
    private MediaPlayer player;
 
    public enum PlayerStatus { Stopped, Paused, Run };
    private PlayerStatus status;
    public PlayerStatus Status
    {
      get { return status; }
    }
 
    private string filePath;
    public string FilePath
    {
      get { return filePath; }
    }
 
    private Slider volumeObj;
    private Slider posObj;
 
    public double Volume
    {
      get { return player.Volume; }
      set { player.Volume=value; }
    }
 
    public double Balance
    {
      get { return player.Balance; }
      set { player.Balance=value;}
    }
 
    public MyMediaPlayer(string filePath, Slider volumeObj,Slider posObj)
    {
      player=new MediaPlayer();
      this.filePath=filePath;
      player.Open(new Uri(filePath));
      status=PlayerStatus.Stopped;
 
      if (volumeObj!=null)
      {
        this.volumeObj=volumeObj;
        volumeObj.Minimum=0;
        volumeObj.Maximum=1;
      }
 
      if (posObj!=null)
      {
        posObj.IsMoveToPointEnabled=true; 
        
        this.posObj=posObj;
        posObj.Minimum=0;
        posObj.Maximum=1;
        posObj.Value=0.5;
 
        Binding posBinding=new Binding();
        posBinding.Source=player;
        posBinding.Path=new PropertyPath("Position");
        posBinding.Mode=BindingMode.TwoWay;
        posBinding.Converter=new PosConverter();
        posBinding.ConverterParameter=player;
        posBinding.UpdateSourceTrigger=UpdateSourceTrigger.PropertyChanged;
        posObj.SetBinding(Slider.ValueProperty,posBinding);
      }
    }
 
    public class PosConverter:IValueConverter
    {
      public object Convert(object value,Type targetType,object parameter,System.Globalization.CultureInfo culture)
      {
        MediaPlayer player=(MediaPlayer)parameter;
        double total=player.NaturalDuration.TimeSpan.TotalSeconds;
        double cur=player.Position.TotalSeconds;
        return cur/total;
      }
 
      public object ConvertBack(object value,Type targetType,object parameter,System.Globalization.CultureInfo culture)
      {
        MediaPlayer player=(MediaPlayer)parameter;
        double total=player.NaturalDuration.TimeSpan.TotalSeconds;
        return TimeSpan.FromSeconds(System.Convert.ToInt64((double)value*total));
      }
    }
 
    public void Stop()
    {
      player.Stop();
      status=PlayerStatus.Stopped;
      posObj.Value=0;
    }
 
    public void Play()
    {
      player.Play();
      status=PlayerStatus.Run;
      volumeObj.Value=player.Volume;
    }
 
    public void Pause()
    {
      player.Pause();
      status=PlayerStatus.Paused;
    }
  }
 
  public partial class Window1:Window
  {
    private MyMediaPlayer aPlayer;
    public Window1()
    {
      InitializeComponent();
 
      aPlayer=new MyMediaPlayer(@"simeFilePath",volume,pos);
 
      balance.Value=aPlayer.Balance;
    }
 
    private void stopBtn_Click(object sender,RoutedEventArgs e)
    {
      aPlayer.Stop();
      playBtn.Content="Play";
    }
 
    private void playBtn_Click(object sender,RoutedEventArgs e)
    {
      if (aPlayer.Status==MyMediaPlayer.PlayerStatus.Run)
      {
        aPlayer.Pause();
        playBtn.Content="Play";
      }
      else
      {
        aPlayer.Play();
        playBtn.Content="Pause";
      }
    }
 
    private void balance_ValueChanged(object sender,RoutedPropertyChangedEventArgs<double> e)
    {
      aPlayer.Balance=balance.Value;
    }
 
    private void volume_ValueChanged(object sender,RoutedPropertyChangedEventArgs<double> e)
    {
      aPlayer.Volume=volume.Value;
    }
  }
}