mono:gtkSharp ~ Sliding Text at Drawing Area (Pango.Layout)

PROJECT REFERENCES:

CODE:

using System;
using Gtk;
using System.Xml;

//REFERENCE LINK: http://www.mono-project.com/Pango:Beginners

public class sliding_MyWindow : Window
{
 Pango.Layout layout;
 Gtk.DrawingArea da;

 int width = 500;
 int height = 500;
 int slideIndex=500;
 int arrayIndex=1;

 private string[] newsArray;

 public sliding_MyWindow()
 :base("sliding_MyWindow")
 {
 this.SetDefaultSize (width, height);
 this.DeleteEvent += new DeleteEventHandler (Onsliding_MyWindowDelete);

 da = new Gtk.DrawingArea();
 da.SetSizeRequest(width, height);

 layout = new Pango.Layout(this.PangoContext);
 layout.Width = Pango.Units.FromPixels(width);
 layout.Wrap = Pango.WrapMode.Word;
 layout.Alignment = Pango.Alignment.Left;
 layout.FontDescription = Pango.FontDescription.FromString("Arial bold 14");

 getNews("http://www.cnnturk.com/servisler/rss/turkiye.rss");

 GLib.Timeout.Add(45, new GLib.TimeoutHandler(updateText));

 this.Add(da);
 this.ShowAll();
 }

 bool updateText()
 {
 slideIndex=slideIndex-2;

 da.GdkWindow.Clear();
 da.GdkWindow.DrawLayout(da.Style.TextGC (StateType.Normal),slideIndex,5,layout);

 if(slideIndex==0)
 {
 layout.SetMarkup(newsArray[arrayIndex]);
 arrayIndex++;
 slideIndex=500;
 }

 return true;
 }

 private void getNews(string newsAddress)
 {
 try
 {
 XmlDocument rssDoc = new XmlDocument();

 System.Net.HttpWebRequest req = (System.Net.HttpWebRequest) System.Net.WebRequest.Create(newsAddress);
 req.Timeout = 1000; // milliseconds
 System.Net.WebResponse res = req.GetResponse();
 System.IO.Stream responseStream = res.GetResponseStream();
 rssDoc.Load(responseStream);
 responseStream.Close();

 XmlNodeList _ngroups = rssDoc.GetElementsByTagName("item");
 if(_ngroups.Count > 0)
 {
 newsArray = new string[_ngroups.Count];

 byte spaces0 = 8, spaces1 = 9, spaces2 = 10, spaces3 = 11, spaces4 = 12, spaces5 = 13;

 for(int x = 0; x < newsArray.Length; x++)
 {
 for (int y = 0; y< _ngroups[x].ChildNodes.Count; y++)
 {
 switch(_ngroups[x].ChildNodes[y].Name)
 {
 case "title":
 newsArray[x] = _ngroups[x].ChildNodes[y].InnerText + " : ";
 break;
 case "description":
 newsArray[x] += _ngroups[x].ChildNodes[y].InnerText;
 break;
 }
 newsArray[x] = newsArray[x].Replace('\n', ' ').Replace((char)spaces0, ' ').Replace((char)spaces1, ' ').Replace((char)spaces2, ' ').Replace((char)spaces3, ' ').Replace((char)spaces4, ' ').Replace((char)spaces5, ' ');
 }
 }
 }
 else
 {
 Console.WriteLine("_ngroups.Count < 0");
 }
 if(newsArray!=null)
 {
 if(newsArray.Length>0)
 {
 layout.SetMarkup(newsArray[0]);
 Console.WriteLine(newsArray[0]);
 }
 }
 }
 catch(Exception e)
 {
 Console.WriteLine("error in getNews():"+e);
 }
 }

 void Onsliding_MyWindowDelete (object sender, DeleteEventArgs a)
 {
 Application.Quit ();
 a.RetVal = true;
 }

 public static void Main()
 {
 Application.Init();
 new sliding_MyWindow();
 Application.Run();
 }

}

OUTPUT:

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