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().

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().

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().