private void IncreaseMask(int position)
{
var provider = MaskProvider;
var str = provider.ToDisplayString().Insert(position, PromptChar.ToString()).Replace(" ", string.Empty);
Mask = FormatMask(Mask.Insert(position, PromptChar.ToString()));
Text = str;
CaretIndex = GetDecimalSeparatorPosition(Mask) - 1;
}
private void DecreaseMask(int position, int length)
{
var decPos = GetDecimalSeparatorPosition(Mask);
var str = MaskProvider.ToDisplayString();
if (position > decPos)
{
Text = str.Remove(position, length).Insert(position, 0.ToString("D" + length));
CaretIndex = position;
return;
}
if (position + length > decPos)
{
var decLength = position + length - decPos - 1;
var decPosition = decPos + 1;
str = str.Remove(decPosition, decLength).Insert(decPosition, 0.ToString("D" + decLength));
length = decPos - position;
}
if (length > 0)
{
str = str.Remove(position, length).Replace(" ", string.Empty);
if (str.Length == 0)
{
str = PromptChar.ToString();
}
var mask = FormatMask(Mask.Remove(position, length));
if (mask.Length == 0 || mask.StartsWith("."))
{
if (mask.StartsWith("."))
{
str = PromptChar + str;
}
mask = PromptChar + mask;
}
Mask = mask;
Text = str;
}
CaretIndex = position;
}