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:

    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;
    QIntValidator v( 0, 100, this );

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

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

    s = "-763";
    v.validate( s, 0 ); // returns Invalid
    s = "abc";
    v.validate( s, 0 ); // returns Invalid
    s = "12v";
    v.validate( s, 0 ); // 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 minimum, int maximum ) `[virtual]`

Sets the range of the validator to only accept 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.

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().

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().