AViD

#region Using Statements

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

#endregion Using Statements

namespace AViD
{
  /// <summary>
  ///   UI Element to initiate an asynchronous operation, which will provide information through
  ///   a progress bar.
  /// </summary>
  public partial class ProgressBar : Form
  {
    #region Constructor

    /// <summary>
    ///   Creates a new instance of the ProgressBar.
    /// </summary>
    public ProgressBar(IWorker worker)
    {
      InitializeComponent();

      // Wire up the events.
      this.m_worker = worker;
      this.m_worker.Progress += new EventHandler<ProgressEventArgs>(ProgressBar_Progress);
      this.m_worker.Complete += new EventHandler(ProgressBar_Complete);

      // Begin the work.
      this.m_worker.Work();
    }

    #endregion Constructor

    #region Events/Delegates

    /// <summary>
    ///   Handles the event when the user clicks the Abort button.
    /// </summary>
    /// <param name="sender">The sender of the event.</param>
    /// <param name="e">The <see cref="EventArgs"/> of the event.</param>
    private void btnAbort_Click(object sender, EventArgs e)
    {
      // Unwire the events.
      this.m_worker.Progress -= new EventHandler<ProgressEventArgs>(ProgressBar_Progress);
      this.m_worker.Complete -= new EventHandler(ProgressBar_Complete);

      // Inform the worker to abort.
      this.m_worker.Abort();

      this.DialogResult = DialogResult.Cancel;
      this.Close();
    }
    /// <summary>
    ///   Handles the event when the <see cref="IWorker"/> is done.
    /// </summary>
    /// <param name="sender">The sender of the event.</param>
    /// <param name="e">The <see cref="EventArgs"/> of the event.</param>
    private void ProgressBar_Complete(object sender, EventArgs e)
    {
      if (this.InvokeRequired)
      {
        this.Invoke(new EventHandler(ProgressBar_Complete), sender, e);
      }
      else if (!this.IsDisposed)
      {
        this.btnAbort.Enabled = false;

        // Unwire the events.
        this.m_worker.Progress -= new EventHandler<ProgressEventArgs>(ProgressBar_Progress);
        this.m_worker.Complete -= new EventHandler(ProgressBar_Complete);

        this.DialogResult = DialogResult.OK;
        this.Close();
      }
    }
    /// <summary>
    ///   Handles the event when the <see cref="IWorker"/> signals progress.
    /// </summary>
    /// <param name="sender">The sender of the event.</param>
    /// <param name="e">The <see cref="ProgressEventArgs"/> of the event.</param>
    private void ProgressBar_Progress(object sender, ProgressEventArgs e)
    {
      if (this.InvokeRequired)
      {
        this.Invoke(new EventHandler<ProgressEventArgs>(ProgressBar_Progress), sender, e);
      }
      else if (!this.IsDisposed)
      {
        this.pbProgress.Value = ((int)(e.PercentComplete * 100.0d));
      }
    }

    #endregion Events/Delegates

    #region Private Members

    private readonly IWorker m_worker;

    #endregion Private Members
  }
}