Mega Code Archive
Masked TextBox Host
<![CDATA[
/*
User Interfaces in C#: Windows Forms and Custom Controls
by Matthew MacDonald
Publisher: Apress
ISBN: 1590590457
*/
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace MaskedTextBoxHost
{
/// <summary>
/// Summary description for MaskedTextBoxHost.
/// </summary>
public class MaskedTextBoxHost : System.Windows.Forms.Form
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;
public MaskedTextBoxHost()
{
//
// 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 );
}
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
//
// MaskedTextBoxHost
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 266);
this.Name = "MaskedTextBoxHost";
this.Text = "MaskedTextBoxHost";
this.Load += new System.EventHandler(this.MaskedTextBoxHost_Load);
}
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new MaskedTextBoxHost());
}
private void MaskedTextBoxHost_Load(object sender, System.EventArgs e)
{
MaskedTextBox txtMask = new
MaskedTextBox();
txtMask.Location = new Point(10, 10);
txtMask.Mask = "(###) ###-####";
this.Controls.Add(txtMask);
}
}
public class MaskedTextBox : TextBox
{
private string mask;
public string Mask
{
get
{
return mask;
}
set
{
mask = value;
this.Text = "";
}
}
protected override void OnKeyPress(KeyPressEventArgs e)
{
if (Mask != "")
{
// Suppress the typed character.
e.Handled = true;
string newText = this.Text;
// Loop through the mask, adding fixed characters as needed.
// If the next allowed character matches what the user has
// typed in (a number or letter), that is added to the end.
bool finished = false;
for (int i = this.SelectionStart; i < mask.Length; i++)
{
switch (mask[i].ToString())
{
case "#" :
// Allow the keypress as long as it is a number.
if (Char.IsDigit(e.KeyChar))
{
newText += e.KeyChar.ToString();
finished = true;
break;
}
else
{
// Invalid entry; exit and don't change the text.
return;
}
case "." :
// Allow the keypress as long as it is a letter.
if (Char.IsLetter(e.KeyChar))
{
newText += e.KeyChar.ToString();
finished = true;
break;
}
else
{
// Invalid entry; exit and don't change the text.
return;
}
default :
// Insert the mask character.
newText += mask[i];
break;
}
if (finished)
{ break; }
}
// Update the text.
this.Text = newText;
this.SelectionStart = this.Text.Length;
}
}
protected override void OnKeyDown(KeyEventArgs e)
{
// Stop special characters.
e.Handled = true;
}
}
}
]]>