QIntValidator Class

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# QIntValidator Class Reference

The QIntValidator class provides a validator which ensures that a string contains a valid integer within a specified range. More...

`#include <qvalidator.h>`

Inherits QValidator.

List of all member functions.

## Public Members

- QIntValidator ( QObject * parent, const char * name = 0 )
- QIntValidator ( int minimum, int maximum, QObject * parent, const char * name = 0 )
- ~QIntValidator ()
- virtual QValidator::State validate ( QString & input, int & ) const
- void setBottom ( int )
- void setTop ( int )
- virtual void setRange ( int minimum, int maximum )
- int bottom () const
- int top () const

## Properties

- int bottom - the validator's lowest acceptable value
- int top - the validator's highest acceptable value

## Detailed Description

The QIntValidator class provides a validator which ensures that a string contains a valid integer within a specified range.

The validate() function returns Acceptable, Intermediate or Invalid. Acceptable means that the string is a valid integer within the specified range. Intermediate means that the string is a valid integer but is not within the specified range. Invalid means that the string is not a valid integer.

Example of use:

        //...
        #include <qlineedit.h>
        #include <qvalidator.h>
        //...
        QIntValidator v( 0, 100, this );
        QLineEdit* edit = new QLineEdit( this );
        // the edit lineedit will only accept integers between 0 and 100
        edit->setValidator( &v );

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

        QString s;
        // a validator that will only accept integers between 0 and 100
        QIntValidator v( 0, 100, this );

        s = "10";
        v.validate( a, 0 ); // Returns Acceptable
        s = "35";
        v.validate( a, 0 ); // Returns Acceptable

        s = "105";
        v.validate( a, 0 ); // Returns Intermediate
        s = "-763";
        v.validate( a, 0 ); // Returns Intermediate

        s = "abc";
        v.validate( a, 0 ); // Returns Invalid;
        s = "12v";
        v.validate( a, 0 ); // 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 )

Constructs a validator that accepts all integers and has parent parent and name name.

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

Constructs a validator that accepts all integers from and including minimum up to and including maximum with parent parent and name name.

### QIntValidator::~QIntValidator ()

Destroys the validator, freeing any resources allocated.

### 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 minimum, int maximum )`[virtual]`

Sets the range of the validator to accept only integers between minimum and maximum inclusive.

### 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]`

Returns Acceptable if the input is an integer within the valid range, Intermediate if the input is an integer outside the valid range and Invalid if the input is not an integer.

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

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

        s = "abc";
        v.validate( a, 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 © 1995-2001 Trolltech, all rights reserved.