Thread.cs :  » GUI » wx-NET » wx » SampleThread » C# / CSharp Open Source

//-----------------------------------------------------------------------------
// wx.NET/Samples - Thread.cs
//
// A wx.NET thread sample.
//
// Written by Alexander Olk (xenomorph2@onlinehome.de)
// (C) 2005 by Alexander Olk
// Licensed under the wxWidgets license, see LICENSE.txt for details.
//
// $Id: Thread.cs,v 1.2 2007/10/21 15:30:42 harald_meyer Exp $
//-----------------------------------------------------------------------------

using System;
using System.Drawing;
using System.Threading;

namespace wx.SampleThread{
  public class MyFrame : wx.Frame
  {
    enum Cmd { Quit, StartThread, StopThread }
    
    private MyButton myButton;
    
    //---------------------------------------------------------------------

    public MyFrame( string title, Point pos, Size size )
      : base( title, pos, size )
    {
      wx.Menu fileMenu = new wx.Menu();
      fileMenu.Append( (int)Cmd.Quit, "E&xit\tAlt-X", "Quit this program" );

      wx.Menu threadMenu = new wx.Menu();
      threadMenu.Append( (int)Cmd.StartThread, "&Start Thread" );
      threadMenu.Append( (int)Cmd.StopThread, "St&op Thread" );

      wx.MenuBar menuBar = new wx.MenuBar();
      menuBar.Append( fileMenu, "&File" );
      menuBar.Append( threadMenu, "&Thread" );

      MenuBar = menuBar;
      
      myButton = new MyButton( this, "Text to change" );

      // Set up the event table

      EVT_MENU( (int)Cmd.Quit,    new EventListener(OnQuit) );
      EVT_MENU( (int)Cmd.StartThread,  new EventListener(OnStartThread) );
      EVT_MENU( (int)Cmd.StopThread,   new EventListener(OnStopThread) );
    }

    //---------------------------------------------------------------------

    public void OnQuit( object sender, wx.Event e )
    {
      Close();
    }
    
    //---------------------------------------------------------------------

    public void OnStartThread( object sender, wx.Event e )
    {
      myButton.StartThread();
    }

    //---------------------------------------------------------------------
    
    public void OnStopThread( object sender, wx.Event e )
    {
      myButton.StopThread();
    }
  }
  
  //---------------------------------------------------------------------
  
  public class MyButton : wx.Button
  {
    private Thread updater_thread = null;
    
    private bool isThreadRunning = false;
    
    private string text = "This will be changed if you start the thread...";
    
    private long counter = 0;
    
    //---------------------------------------------------------------------
  
    public MyButton( Window parent, string label )
      : base( parent, label )
    {
      ObjectDeleted = new ObjectDeletedHandler( MyObjectDeleted );
      
      EVT_UPDATE_UI( ID, new EventListener( OnUpdateUI ) );
    }
    
    //---------------------------------------------------------------------
    
    public void OnUpdateUI( object sender, Event e )
    {
      Label = text;
    }
    
    //---------------------------------------------------------------------
    
    public void IncText()
    {
      text = "counter: " + counter++;
    }
    
    //---------------------------------------------------------------------
    
    public void StartThread()
    {
      updater_thread = new Thread( new ThreadStart( ThreadFunc ) );
      isThreadRunning = true;
      updater_thread.IsBackground = true;
      updater_thread.Start();
    }
    
    //---------------------------------------------------------------------
    
    public void StopThread()
    {
      isThreadRunning = false;
    }
    
    //---------------------------------------------------------------------
    
    public void MyObjectDeleted()
    {
      Console.WriteLine( "The object got deleted inside the c++ wrapper lib..." );
      
      isThreadRunning = false;
    }
    
    //---------------------------------------------------------------------
    
    void ThreadFunc()
    {
      Console.WriteLine( "Thread started..." );
    
      try
      {
        while ( true )
        {
          Thread.Sleep( 100 );
        
          if ( !isThreadRunning )
            break;
            
          IncText();
            
          EventHandler.AddPendingEvent( new UpdateUIEvent( ID ) );
        }
      }
      finally
      {
        updater_thread = null;
      }
      
      Console.WriteLine( "Thread stopped..." );
    }
  }
  
  //---------------------------------------------------------------------

  public class Threads : wx.App
  {
    public override bool OnInit()
    {
      MyFrame frame = new MyFrame( "wx.NET Thread sample", new Point( 50, 50 ), new Size( 450, 340 ) );
      frame.Show( true );

      return true;
    }

    //---------------------------------------------------------------------

    [STAThread]
    static void Main()
    {
      Threads app = new Threads();
      app.Run();
    }
  }
}