I am trying to set up a QIntValidator to validate input on a QLineEdit. This is what I did:
userInput = new QLineEdit("1");
userInput->setValidator(new QIntValidator ( 1, 20, this ) );
This appears to work: it does not allow any letters in. However, I can type in 0, which is out of range, and I can also type in numbers like 21, 39 and 80, all out of range of 1-20. Basically, I expect that the QIntValidator will only allow number inputs in the range 1-20, but, instead, I find that it allows all nonnegative number inputs less than 100 (I can also do 00000.)
Why is the QIntValidator not working as I expected it to and how do I fix it?
The 0 is accepted as QValidator::Intermediate state, because the user may intend to type e.g. 05, which would be valid. You won't be able to actually input the undesired value. After you press Return or move focus from the widget, having 0 in the input field, the value should return to the original (well, at least spinboxes behave so, not sure about QLineEdit).