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qt'QColIntValidator (./qt-2.1.0/src/dialogs/qcolordialog.cpp:473)

class QColIntValidator: public QIntValidator
{
public:
    QColIntValidator( int bottom, int top,
		   QWidget * parent, const char *name = 0 )
	:QIntValidator( bottom, top, parent, name ) {}

    QValidator::State validate( QString &, int & ) const;
};

QValidator::State QColIntValidator::validate( QString &s, int &pos ) const
{
    State state = QIntValidator::validate(s,pos);
    if ( state == Valid ) {
	long int val = s.toLong();
	// This is not a general solution, assumes that top() > 0 and
	// bottom >= 0
	if ( val < 0 ) {
	    s = "0";
	    pos = 1;
	} else if ( val > top() ) {
	    s.setNum( top() );
	    pos = s.length();
	}
    }
    return state;
}