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().
See also QDoubleValidator and QRegExpValidator.
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.
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.
