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

Inheritance diagram for QIntValidator:

Public Signals
void	bottomChanged (int newValue)

void	topChanged (int newValue)

Public Signals inherited from QValidator
void	changed ()

Public Signals inherited from QObject
void	destroyed (QObject *obj=nullptr)

void	objectNameChanged (const QString &objectName)

Public Methods
	QIntValidator (int minimum, int maximum, QObject *parent=nullptr)

	QIntValidator (QObject *parent=nullptr)

	~QIntValidator ()

int	bottom () const

void	fixup (QString &input) const override

void	setBottom (int newValue)

virtual void	setRange (int minimum, int maximum)

void	setTop (int newValue)

int	top () const

QValidator::State	validate (QString &input, int &pos) const override

Public Methods inherited from QValidator
	QValidator (QObject *parent=nullptr)

	~QValidator ()

QLocale	locale () const

void	setLocale (const QLocale &locale)

Public Methods inherited from QObject
	QObject (QObject *parent=nullptr)

	~QObject ()

bool	blockSignals (bool block)

const QList< QObject * > &	children () const

bool	connect (const QObject *sender, const QString &signalMethod, const QString &location, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

bool	connect (const QObject *sender, const QString &signalMethod, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

bool	disconnect (const QObject *receiver, const QString &slotMethod=QString ()) const

bool	disconnect (const QString &signalMethod, const QString &location, const QObject *receiver=nullptr, const QString &slotMethod=QString ()) const

bool	disconnect (const QString &signalMethod=QString (), const QObject *receiver=nullptr, const QString &slotMethod=QString ()) const

void	dumpObjectInfo ()

void	dumpObjectTree ()

QList< QString >	dynamicPropertyNames () const

virtual bool	event (QEvent *event)

virtual bool	eventFilter (QObject watched, QEvent event)

template<typename T >
T	findChild (const QString &childName=QString ()) const

template<class T >
QList< T >	findChildren (const QRegularExpression &regExp, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const

template<class T >
QList< T >	findChildren (const QString &childName=QString (), Qt::FindChildOptions options=Qt::FindChildrenRecursively) const

bool	inherits (const QString &className) const

void	installEventFilter (QObject *filterObj)

bool	isWidgetType () const

bool	isWindowType () const

void	killTimer (int id)

const QMetaObject *	metaObject () const

void	moveToThread (QThread *targetThread)

QString	objectName () const

QObject *	parent () const

template<class T = QVariant>
T	property (const QString &name) const

void	removeEventFilter (QObject *obj)

void	setObjectName (const QString &name)

void	setParent (QObject *parent)

bool	setProperty (const QString &name, const QVariant &value)

bool	signalsBlocked () const

int	startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)

QThread *	thread () const

Properties
	bottom

	top

Properties inherited from QObject
	objectName

Additional Inherited Members
Public Types inherited from QValidator
enum	State

Public Slots inherited from QObject
void	deleteLater ()

Static Public Methods inherited from QObject
static bool	connect (const QObject sender, const QMetaMethod &signalMethod, const QObject receiver, const QMetaMethod &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

static bool	connect (const QObject sender, const QString &signalMethod, const QObject receiver, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection, const QString &location=QString ())

static bool	connect (const QObject sender, const QString &signalMethod, const QString &location, const QObject receiver, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class SlotClass , class... SlotArgs, class SlotReturn >
static bool	connect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver receiver, SlotReturn (SlotClass::slotMethod)(SlotArgs...), Qt::ConnectionType type=Qt::AutoConnection)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class T >
static bool	connect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver *receiver, T slotLambda, Qt::ConnectionType type=Qt::AutoConnection)

static bool	disconnect (const QObject sender, const QMetaMethod &signalMethod, const QObject receiver, const QMetaMethod &slotMethod)

static bool	disconnect (const QObject sender, const QString &signalMethod, const QObject receiver, const QString &slotMethod)

static bool	disconnect (const QObject sender, const QString &signalMethod, const QString &location, const QObject receiver, const QString &slotMethod)

static bool	disconnect (const QObject sender, std::nullptr_t, const QObject receiver, std::nullptr_t)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class SlotClass , class... SlotArgs, class SlotReturn >
static bool	disconnect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver receiver, SlotReturn (SlotClass::slotMethod)(SlotArgs...))

template<class Sender , class SignalClass , class... SignalArgs, class Receiver >
static bool	disconnect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver *receiver, std::nullptr_t slotMethod=nullptr)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class T >
static bool	disconnect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver *receiver, T slotMethod)

static QMetaObject &	staticMetaObject ()

static QString	tr (const char text, const char comment=nullptr, std::optional< int > numArg=std::optional< int >())

Protected Methods inherited from QObject
virtual void	childEvent (QChildEvent *event)

virtual void	connectNotify (const QMetaMethod &signalMethod) const

virtual void	customEvent (QEvent *event)

virtual void	disconnectNotify (const QMetaMethod &signalMethod) const

bool	isSignalConnected (const QMetaMethod &signalMethod) const

int	receivers (const QString &signal) const

QObject *	sender () const

int	senderSignalIndex () const

virtual void	timerEvent (QTimerEvent *event)

Related Functions inherited from QObject
T	qobject_cast (QObject *object)

	QObjectList

Detailed Description

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

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, 900, this);
 
str = "1";
v.validate(str, pos);     // returns Intermediate
str = "012";
v.validate(str, pos);     // returns Intermediate
 
str = "123";
v.validate(str, pos);     // returns Acceptable
str = "678";
v.validate(str, pos);     // returns Acceptable
 
str = "999";
v.validate(str, pos);    // returns Intermediate
 
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

Notice that the value 999 returns Intermediate. Values consisting of a number of digits equal to or less than the max value are considered intermediate. This is intended because the digit that prevents a number to be in range is not necessarily the last digit typed. This also means that an intermediate number can have leading zeros.

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, QRegularExpressionValidator

Constructor & Destructor Documentation

QIntValidator::QIntValidator ( QObject * parent = nullptr )

explicit

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

QIntValidator::QIntValidator	(	int	minimum,
		int	maximum,
		QObject *	parent = `nullptr`
	)

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

QIntValidator::~QIntValidator ( )

Destroys the validator.

Method Documentation

int QIntValidator::bottom ( ) const

inline

Returns the value of the property.

void QIntValidator::bottomChanged ( int newValue )

signal

This signal is emitted when the value of the property changes. The specified newValue represents the updated value.

void QIntValidator::fixup ( QString & input ) const

overridevirtual

Reimplemented from QValidator::fixup()

void QIntValidator::setBottom ( int newValue )

Sets the value of the property to newValue.

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 newValue )

Sets the value of the property to newValue.

int QIntValidator::top ( ) const

inline

Returns the value of the property.

void QIntValidator::topChanged ( int newValue )

signal

This signal is emitted when the value of the property changes. The specified newValue represents the updated value.

QValidator::State QIntValidator::validate	(	QString &	input,
		int &	pos
	)		const

overridevirtual

Returns Acceptable if the input is an integer within the valid range, Intermediate if the input is a prefix of an integer in the valid range, and Invalid otherwise.

If the valid range consists of just positive integers (e.g., 32 to 100) and input is a negative integer, then Invalid is returned. (On the other hand, if the range consists of negative integers (e.g., -100 to -32) and input is a positive integer, then Intermediate is returned, because the user might be just about to type the minus (especially for right-to-left languages).

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.

Implements QValidator::validate()

Property Documentation

QIntValidator::bottom

This property holds the validator's lowest acceptable value.

By default, this property's value is derived from the lowest signed integer available (typically -2147483647).

See also: setRange()

Properties	Class Methods
read	bottom
write	setBottom
notify	bottomChanged

QIntValidator::top

This property holds the validator's highest acceptable value.

By default, this property's value is derived from the highest signed integer available (typically 2147483647).

See also: setRange()

Properties	Class Methods
read	top
write	setTop
notify	topChanged

Public Signals

Public Methods

Properties

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Method Documentation

Property Documentation