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 bottom, int top )
- 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.

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 )

Constructs a validator called name with parent parent, that accepts all integers.

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

Constructs a validator called name with parent parent, that accepts integers from minimum to maximum inclusive.

### 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 bottom, int top )`[virtual]`

Sets the range of the validator to only accept integers between bottom and top 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.

Note: If the valid range consists of just positive integers (e.g. 32 - 100) and input is a negative integer then Invalid is returned.

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

        s = "5";
        v.validate( s, pos ); // returns Intermediate

        s = "50";
        v.validate( s, pos ); // returns Valid

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 © 1995-2005 Trolltech. All Rights Reserved.