Qt 4.3: QIntValidator Class Reference

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# QIntValidator Class Reference
[QtGui module]

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

     #include <QIntValidator>

Inherits QValidator.

- List of all members, including inherited members
- Qt 3 support members

### Properties

- bottom : int
- top : int

- 1 property inherited from QObject

### Public Functions

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

- 4 public functions inherited from QValidator
- 29 public functions inherited from QObject

### Additional Inherited Members

- 1 public slot inherited from QObject
- 1 signal inherited from QObject
- 5 static public members inherited from QObject
- 7 protected functions inherited from QObject

## Detailed Description

The QIntValidator class provides a validator that ensures 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().

QIntValidator uses its locale() to interpret the number. For example, in Arabic locales, QIntValidator will accept Arabic digits. In addition, QIntValidator is always guaranteed to accept a number formatted according to the "C" locale.

See also QDoubleValidator, QRegExpValidator, and Line Edits Example.

## Property Documentation

### bottom : int

This property holds the validator's lowest acceptable value.

Access functions:

- int bottom () const
- void setBottom ( int )

See also setRange().

### top : int

This property holds the validator's highest acceptable value.

Access functions:

- int top () const
- void setTop ( int )

See also setRange().

## Member Function Documentation

### QIntValidator::QIntValidator ( QObject * parent )

Constructs a validator with a parent object that accepts all integers.

### QIntValidator::QIntValidator ( int minimum, int maximum, QObject * parent )

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

### QIntValidator::~QIntValidator ()

Destroys the validator.

### void QIntValidator::setRange ( int bottom, int top ) `[virtual]`

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

### QValidator::State QIntValidator::validate ( QString & input, int & pos ) 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 to 100) and input is a negative integer then Invalid is returned. If input has a greater number of digits than an integer in the valid range can have, 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 Acceptable

By default, the pos parameter is not used by this validator.

Reimplemented from QValidator.