SQL Editor for Database Developers

// -------------------------------------------------------
// SqlBuilder by Elm�Soft
// www.netcult.ch/elmue
// www.codeproject.com/KB/database/SqlBuilder.aspx
// -------------------------------------------------------

using System;
using System.Text;
using System.Windows.Forms;
using SqlBuilder.Forms;

namespace SqlBuilder.Controls
{
	/// <summary>
	/// This class is a textbox which displays a password
	/// The password is displayed as plain text while it is typed in by the user.
	/// But it is displayed as 12 stars when set via SetText()
	/// Accessing the content is ONLY possible via SetText() and GetText() 
	/// otherwise (using pwdBox.Text) you will receive only stars !!!
	/// This text box can NOT by spied out using a Win32 API spy or a .NET spy
	/// </summary>
	public class PasswordTextBox : TextBox
	{
		const   string ms_Stars      = "************";
		private string ms_Encrypted  = "";

		/// <summary>
		/// Use SetText() instead of the ."Text" property
		/// Only properties can be spied with a .NET spy, not functions
		/// </summary>
		public void SetText(string s_Value, bool b_Encrypted)
		{
			s_Value = s_Value.Trim();
			if (b_Encrypted)
			{
				// If a password is set which cannot be decrypted -> set empty
				if (Functions.Crypt(s_Value, Defaults.EncryptionKey, false) == "")
					s_Value = "";
				
				ms_Encrypted = s_Value;
			}
			else
			{
				ms_Encrypted = Functions.Crypt(s_Value, Defaults.EncryptionKey, true);
			}

			if (ms_Encrypted.Length > 0) this.Text = ms_Stars;
			else                         this.Text = "";
			base.OnTextChanged (null);
		}

		/// <summary>
		/// Use GetText() instead of the ".Text" property
		/// Only properties can be spied with a .NET spy, not functions
		/// </summary>
		public string GetText(bool b_Encrypted)
		{
			if (b_Encrypted)
				return ms_Encrypted;
			else
				return Functions.Crypt(ms_Encrypted, Defaults.EncryptionKey, false);
		}

		protected override void OnTextChanged(EventArgs e)
		{
			// Do not fire the event here! (this is called before KeyUp!)
		}

		/// <summary>
		/// Refresh the internal value after the user has typed text
		/// </summary>
		protected override void OnKeyUp(System.Windows.Forms.KeyEventArgs e)
		{
			base.OnKeyUp(e);
			if (base.Text != ms_Stars)
				ms_Encrypted = Functions.Crypt(base.Text.Trim(), Defaults.EncryptionKey, true);

			base.OnTextChanged (e);
		}

		/// <summary>
		/// After the control lost the focus -> display stars or empty
		/// </summary>
		protected override void OnLostFocus(System.EventArgs e)
		{
			base.OnLostFocus(e);
			if (ms_Encrypted.Length > 0) this.Text = ms_Stars;
			else                         this.Text = "";
		}
	}
}