private void MainDisplay_TextChanged(object sender, EventArgs e)
{
//Limit input length to 60 character.
int maxLength = 60;
if (mainDisplay.Text.Length >= maxLength)
{
mainDisplay.Text = mainDisplay.Text.Remove(maxLength - 1, 1) + "";
}
//Try and pre-calculate their current expression, if the user were to press equals, but not after they have already pressed equals
if (mainDisplay.Text.Contains('=') == false)
{
//Only calculate if the last term in their expression was fully entered. I.e. not '4 + ."
string expression = mainDisplay.Text;
if (expression.LastIndexOf('.') == expression.Length - 1)
{
return; //Do not calculate an incomplete expression
}
else
{
calculator.Start(expression, true);
}
}
}