QLineEdit set min max range?

[jpn]

The focus out event could look for example something like this:

void MyLineEdit::focusOutEvent(QFocusEvent* event)
{
	// check validator state
	int pos = 0;
	QValidator::State state = validator()->validate(text(), pos);
 
	if (state == QValidator::Intermediate)
	{
		// keep focus if intermediate
		setFocus();
	}
	else
	{
		// otherwise call base class implementation and let it
		// handle focus out actions (so cursor stops blinking etc.)
		QLineEdit::focusOutEvent(event);
	}
}

void MyLineEdit::focusOutEvent(QFocusEvent* event)
{
	// check validator state
	int pos = 0;
	QValidator::State state = validator()->validate(text(), pos);

	if (state == QValidator::Intermediate)
	{
		// keep focus if intermediate
		setFocus();
	}
	else
	{
		// otherwise call base class implementation and let it
		// handle focus out actions (so cursor stops blinking etc.)
		QLineEdit::focusOutEvent(event);
	}
}

To copy to clipboard, switch view to plain text mode 

If you have difficulties in subclassing QLineEdit, I suggest you to switch back to your favourite C++ book and learn the secrects of inheritance..