// http://www.switchonthecode.com/tutorials/wpf-snippet-detecting-binding-errors

using System.Diagnostics;
using System.Text;
using System.Windows;

namespace MetroWpf.Xaml.Binding
{
  public class BindingErrorTraceListener : DefaultTraceListener
  {
    private static BindingErrorTraceListener _listener;


    private readonly StringBuilder _message = new StringBuilder();

    private BindingErrorTraceListener()
    {
    }

    public override void Write(string message)
    {
      _message.Append(message);
    }

    public override void WriteLine(string message)
    {
      _message.Append(message);

      var final = _message.ToString();
      _message.Length = 0;

      MessageBox.Show(final, 
        "Binding Error", 
        MessageBoxButton.OK,
        MessageBoxImage.Error);
    }

    public static void CloseTrace()
    {
      if (_listener == null)
      {
        return;
      }

      _listener.Flush();
      _listener.Close();
      PresentationTraceSources.DataBindingSource.Listeners.Remove(_listener);
      _listener = null;
    }

    [Conditional("DEBUG")]
    public static void SetTrace()
    {
      SetTrace(SourceLevels.Error, TraceOptions.None);
    }

    public static void SetTrace(SourceLevels level, TraceOptions options)
    {
      if (_listener == null)
      {
        _listener = new BindingErrorTraceListener();
        PresentationTraceSources.DataBindingSource.Listeners.Add(_listener);
      }

      _listener.TraceOutputOptions = options;
      PresentationTraceSources.DataBindingSource.Switch.Level = level;
    }
  }
}