MARKUS

using System.Windows.Controls;

using System.Windows;

using System.Windows.Media;

using System.Windows.Documents;

using System.Diagnostics;

using System.Windows.Controls.Primitives;

namespace Markus.Service.StationController.Controls

{

    public partial class TraceDocument : FlowDocument, ITraceTextSink

    {

        private delegate void AppendTextDelegate(string msg, string style);

        private TraceListener _listener;

        public TraceDocument()

        {

            AutoAttach = true;

            InitializeComponent();

        }

        public bool AutoAttach { get; set; }

        public void Event(string msg, TraceEventType eventType)

        {

            Append(msg, eventType.ToString());

        }

        public void Fail(string msg)

        {

            Append(msg, "Fail");

        }

        private void Append(string msg, string style)

        {

            if (Dispatcher.CheckAccess())

            {

                Debug.Assert(Blocks.LastBlock != null);

                Debug.Assert(Blocks.LastBlock is Paragraph);

                var run = new Run(msg);

                run.Style = (Style)(Resources[style]);

                if (run.Style == null)

                    run.Style = (Style)(Resources["Information"]);

                ((Paragraph)Blocks.LastBlock).Inlines.Add(run);

                ScrollParent(this);

            }

            else

            {

                Dispatcher.Invoke(new AppendTextDelegate(Append), msg, style);

            }

        }

        private static void ScrollParent(FrameworkContentElement element)

        {

            if (element != null)

            {

                if (element.Parent is TextBoxBase)

                    ((TextBoxBase)element.Parent).ScrollToEnd();

                else if (element.Parent is ScrollViewer)

                    ((ScrollViewer)element.Parent).ScrollToEnd();

                else

                    ScrollParent(element.Parent as FrameworkContentElement);

            }

        }

        private void Document_Loaded(object sender, RoutedEventArgs e)

        {

            if (AutoAttach && _listener == null)

            {

                _listener = new TraceTextSource(this);

                Trace.Listeners.Add(_listener);

            }

        }

        private void Document_Unloaded(object sender, RoutedEventArgs e)

        {

            if (_listener != null)

            {

                Trace.Listeners.Remove(_listener);

                _listener.Dispose();

                _listener = null;

            }

        }

    }

}