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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

Properties


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 );
    edit->setValidator( &v );   // the edit lineedit will only accept integers between 0 and 100
  

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 );    // a validator that will only accept integers between 0 and 100

    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 and QRegExpValidator.


Member Function Documentation

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

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

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

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

QIntValidator::~QIntValidator ()

Destroys the validator, freeing any resources allocated.

int QIntValidator::bottom () const

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

void QIntValidator::setBottom ( int )

Sets the validator's smallest 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 from minimum to maximum, both inclusive.

void QIntValidator::setTop ( int )

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

int QIntValidator::top () const

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

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

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

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

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

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.

Reimplemented from QValidator.


Property Documentation

int bottom

This property holds the validator's smallest 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 largest acceptable value.

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

See also setRange().


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