QIntValidator Class Reference

Detailed Description

Example of use:

    QValidator* validator = new QIntValidator( 100, 999, this );
    QLineEdit* edit = new QLineEdit( this );

    // the edit lineedit will only accept integers between 100 and 999 
    edit->setValidator( validator );
    

Below we present some examples of validators. In practice they would normally be associated with a widget as in the example above.

    QString str;
    int pos = 0;
    QIntValidator v( 100, 999, this );

    str = "1";
    v.validate( str, pos );     // returns Intermediate
    str = "12";
    v.validate( str, pos );     // returns Intermediate

    str = "123";
    v.validate( str, pos );     // returns Acceptable
    str = "678";
    v.validate( str, pos );     // returns Acceptable

    str = "1234";
    v.validate( str, pos );     // returns Invalid
    str = "-123";
    v.validate( str, pos );     // returns Invalid
    str = "abc";
    v.validate( str, pos );     // returns Invalid
    str = "12cm";
    v.validate( str, pos );     // returns Invalid
    

The minimum and maximum values are set in one call with setRange() or individually with setBottom() and setTop().

See also QDoubleValidator, QRegExpValidator, and Miscellaneous Classes.

Member Function Documentation

QIntValidator::QIntValidator ( QObject * parent, const char * name = 0 )

QIntValidator::QIntValidator ( int minimum, int maximum, QObject * parent, const char * name = 0 )

QIntValidator::~QIntValidator ()

int QIntValidator::bottom () const

Returns the validator's lowest acceptable value. See the "bottom" property for details.

void QIntValidator::setBottom ( int )

Sets the validator's lowest acceptable value. See the "bottom" property for details.

void QIntValidator::setRange ( int bottom, int top ) [virtual]

void QIntValidator::setTop ( int )

Sets the validator's highest acceptable value. See the "top" property for details.

int QIntValidator::top () const

Returns the validator's highest acceptable value. See the "top" property for details.

QValidator::State QIntValidator::validate ( QString & input, int & ) const [virtual]

Note: If the valid range consists of just positive integers (e.g. 0 - 100) and input is a negative integer then Invalid is returned.

    s = "35";
    v.validate( s, 0 ); // returns Acceptable

    s = "105";
    v.validate( s, 0 ); // returns Intermediate

    s = "abc";
    v.validate( s, 0 ); // returns Invalid

    

Reimplemented from QValidator.

Property Documentation

int bottom

This property holds the validator's lowest acceptable value.

Set this property's value with setBottom() and get this property's value with bottom().

See also setRange().

int top

This property holds the validator's highest acceptable value.

Set this property's value with setTop() and get this property's value with top().

See also setRange().

This file is part of the Qt toolkit. Copyright © 1995-2003 Trolltech. All Rights Reserved.