private void TextBox_PreviewKeyDown(object sender, KeyEventArgs e)
{
bool isNumPadNumeric = (e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9);
bool isNumeric = (e.Key >= Key.D0 && e.Key <= Key.D9);
Key[] keysToFilter = { Key.Delete, Key.Back, Key.Left, Key.Right, Key.Tab };
if (!isNumeric && !isNumPadNumeric && !keysToFilter.Contains(e.Key))
{
e.Handled = true;
return;
}
if ((e.Key == Key.Right && (sender as TextBox).CaretIndex == (sender as TextBox).Text.Length))
{
if (sender == Field1)
{
Field2.Focus();
}
else if (sender == Field2)
{
Field3.Focus();
}
else if (sender == Field3)
{
Field4.Focus();
}
e.Handled = true;
}
else if (e.Key == Key.Left && (sender as TextBox).CaretIndex == 0)
{
if (sender == Field4)
{
Field3.Focus();
}
else if (sender == Field3)
{
Field2.Focus();
}
else if (sender == Field2)
{
Field1.Focus();
}
e.Handled = true;
}
else if (e.Key == Key.OemMinus)
{
e.Handled = true;
}
}
private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
{
var tbx = sender as TextBox;
byte value = 0;
if (!string.IsNullOrEmpty(tbx.Text) && !Byte.TryParse(tbx.Text, out value))
{
tbx.Text = "255";
if (sender == Field1)
{
Field2.Focus();
}
else if (sender == Field2)
{
Field3.Focus();
}
else if (sender == Field3)
{
Field4.Focus();
}
}
else if (tbx.Text.Length == 3)
{
if (sender == Field1)
{
Field2.Focus();
}
else if (sender == Field2)
{
Field3.Focus();
}
else if (sender == Field3)
{
Field4.Focus();
}
}
SetValue(ValueProperty, string.Format("{0}.{1}.{2}.{3}", Field1.Text, Field2.Text, Field3.Text, Field4.Text));
}