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using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Threading;

namespace WinFormThreading
{
  /// <summary>
  /// Summary description for Form1.
  /// </summary>
  public class Form1 : System.Windows.Forms.Form
  {
    private System.Windows.Forms.Button button1;
    private System.Windows.Forms.TextBox textBox1;
    private System.Windows.Forms.Button button2;
    private System.Windows.Forms.CheckBox cbThreadPool;
    private System.Windows.Forms.ProgressBar progressBar1;
    /// <summary>
    /// Required designer variable.
    /// </summary>
    private System.ComponentModel.Container components = null;

    public Form1()
    {
      //
      // Required for Windows Form Designer support
      //
      InitializeComponent();

      //
      // TODO: Add any constructor code after InitializeComponent call
      //
    }

    /// <summary>
    /// Clean up any resources being used.
    /// </summary>
    protected override void Dispose( bool disposing )
    {
      if( disposing )
      {
        if (components != null) 
        {
          components.Dispose();
        }
      }
      base.Dispose( disposing );
    }

    #region Windows Form Designer generated code
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {
             this.button1 = new System.Windows.Forms.Button();
             this.textBox1 = new System.Windows.Forms.TextBox();
             this.button2 = new System.Windows.Forms.Button();
             this.cbThreadPool = new System.Windows.Forms.CheckBox();
             this.progressBar1 = new System.Windows.Forms.ProgressBar();
             this.SuspendLayout();
             // 
             // button1
             // 
             this.button1.Location = new System.Drawing.Point(24, 56);
             this.button1.Name = "button1";
             this.button1.Size = new System.Drawing.Size(88, 24);
             this.button1.TabIndex = 0;
             this.button1.Text = "Start..";
             this.button1.Click += new System.EventHandler(this.button1_Click);
             // 
             // textBox1
             // 
             this.textBox1.Location = new System.Drawing.Point(24, 24);
             this.textBox1.Name = "textBox1";
             this.textBox1.ReadOnly = true;
             this.textBox1.Size = new System.Drawing.Size(100, 20);
             this.textBox1.TabIndex = 1;
             this.textBox1.Text = "--";
             // 
             // button2
             // 
             this.button2.Location = new System.Drawing.Point(120, 56);
             this.button2.Name = "button2";
             this.button2.Size = new System.Drawing.Size(88, 24);
             this.button2.TabIndex = 1;
             this.button2.Text = "Click Me..";
             this.button2.Click += new System.EventHandler(this.button2_Click);
             // 
             // cbThreadPool
             // 
             this.cbThreadPool.Location = new System.Drawing.Point(136, 24);
             this.cbThreadPool.Name = "cbThreadPool";
             this.cbThreadPool.Size = new System.Drawing.Size(104, 24);
             this.cbThreadPool.TabIndex = 3;
             this.cbThreadPool.Text = "ThreadPool";
             // 
             // progressBar1
             // 
             this.progressBar1.Location = new System.Drawing.Point(32, 88);
             this.progressBar1.Name = "progressBar1";
             this.progressBar1.Size = new System.Drawing.Size(184, 23);
             this.progressBar1.TabIndex = 4;
             // 
             // Form1
             // 
             this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
             this.ClientSize = new System.Drawing.Size(272, 118);
             this.Controls.Add(this.progressBar1);
             this.Controls.Add(this.cbThreadPool);
             this.Controls.Add(this.button2);
             this.Controls.Add(this.textBox1);
             this.Controls.Add(this.button1);
             this.Name = "Form1";
             this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
             this.Text = "WinForm Threading";
             this.ResumeLayout(false);
             this.PerformLayout();

    }
    #endregion

    /// <summary>
    /// The main entry point for the application.
    /// </summary>
    [STAThread]
    static void Main() 
    {
      Application.Run(new Form1());
    }

    delegate void ShowProgressDelegate ( int totalMessages, int messagesSoFar, bool statusDone );

    private void button1_Click(object sender, System.EventArgs e)
    {

      ShowProgressDelegate showProgress = new ShowProgressDelegate(ShowProgress);
      int imsgs = 100;

      //One Way... Using ThreadPool
      if ( cbThreadPool.Checked )
      {
        object obj = new object[] { this, showProgress, imsgs };
        WorkerClass wc = new WorkerClass();
        bool rc = ThreadPool.QueueUserWorkItem( new WaitCallback (wc.RunProcess), obj);
        EnableButton( ! rc );
      }
      else 
      {
        //another way.. using straight threads
        //WorkerClass wc = new WorkerClass( this, showProgress, imsgs);
        WorkerClass wc = new WorkerClass( this, showProgress, new object[] { imsgs } );
        Thread t = new Thread( new ThreadStart(wc.RunProcess));
        t.IsBackground = true; //make them a daemon - prevent thread callback issues
        t.Start();
        EnableButton ( false );
      }
    }

    private void EnableButton ( bool flag )
    {
      button1.Enabled = flag;
    }
    /// <summary>
    /// Simple method that updates the text box & progress bar
    /// </summary>
    /// <param name="totalMessages"></param>
    /// <param name="messagesSoFar"></param>
    /// <param name="done"></param>
    private void ShowProgress ( int totalMessages, int messagesSoFar, bool done )
    {
      textBox1.Text = String.Format( messagesSoFar.ToString() );
      progressBar1.Value = messagesSoFar;
      if ( done ) EnableButton ( done );
    }

    private void button2_Click(object sender, System.EventArgs e)
    {
      MessageBox.Show("You clicked me!");
    }

         


  }
}