using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Windows.Forms;
using System.Diagnostics;
namespace UtilityLibrary
{
///
/// Summary description for NumericTextBox.
///
public class NumericTextBox : System.Windows.Forms.TextBox
{
private int minimum = -1;
private int maximum = -1;
private bool useRange = false;
private string lastChar;
public NumericTextBox()
{
InitializeComponent();
}
protected override void OnPaint(PaintEventArgs pe)
{
base.OnPaint(pe);
}
public Size SetRange
{
get
{
if ( useRange )
return new Size(minimum, maximum);
else
return new Size(-1, -1);
}
set
{
minimum = value.Width;
maximum = value.Height;
useRange = true;
}
}
private void InitializeComponent()
{
//
// NumericTextBox
//
this.TextChanged += new System.EventHandler(this.NumericTextBox_TextChanged);
}
protected override void OnKeyPress(KeyPressEventArgs e)
{
// Allow only numeric characters
base.OnKeyPress(e);
if ( Char.IsLetter(e.KeyChar) || Char.IsPunctuation(e.KeyChar) || Char.IsSeparator(e.KeyChar) )
e.Handled = true;
else
{
e.Handled = false;
}
}
private void NumericTextBox_TextChanged(object sender, System.EventArgs e)
{
if ( useRange )
{
if ( Text != "" )
{
int val = Convert.ToInt32(Text);
if ( val > maximum )
{
Text = maximum.ToString();
}
else if ( val < minimum )
{
Text = minimum.ToString();
}
if ( Text.Length == 1 )
{
// If use delete the last character remaining
// remember it so that if the user jumps to another
// edit control we can put back the last digit so that
// we don't have an empty numeric control which is not good
lastChar = Text;
}
}
}
}
protected override void OnLostFocus(EventArgs e)
{
base.OnLostFocus(e);
if ( Text.Length == 0 && useRange )
{
Text = lastChar;
}
}
}
}