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

#include <qvalidator.h>

Inheritance diagram for QIntValidator:

Public Functions
int	bottom () const

void	fixup (QString &input) const
	Reimplemented Function More...

	QIntValidator (QObject *parent=0)
	Constructs a validator with a parent object that accepts all integers. More...

	QIntValidator (int bottom, int top, QObject *parent=0)
	Constructs a validator with a parent, that accepts integers from minimum to maximum inclusive. More...

void	setBottom (int)

virtual void	setRange (int bottom, int top)
	Sets the range of the validator to only accept integers between bottom and top inclusive. More...

void	setTop (int)

int	top () const

QValidator::State	validate (QString &, int &) const
	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. More...

	~QIntValidator ()
	Destroys the validator. More...

Public Functions inherited from QValidator
QLocale	locale () const
	Returns the locale for the validator. More...

	QValidator (QObject *parent=0)
	Sets up the validator. More...

void	setLocale (const QLocale &locale)
	Sets the locale that will be used for the validator. More...

	~QValidator ()
	Destroys the validator, freeing any storage and other resources used. More...

Public Functions inherited from QObject
bool	blockSignals (bool b)
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). More...

const QObjectList &	children () const
	Returns a list of child objects. More...

bool	connect (const QObject sender, const char signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const

bool	disconnect (const char signal=0, const QObject receiver=0, const char *member=0)

bool	disconnect (const QObject receiver, const char member=0)

void	dumpObjectInfo ()
	Dumps information about signal connections, etc. More...

void	dumpObjectTree ()
	Dumps a tree of children to the debug output. More...

QList< QByteArray >	dynamicPropertyNames () const
	Returns the names of all properties that were dynamically added to the object using setProperty(). More...

virtual bool	event (QEvent *)
	This virtual function receives events to an object and should return true if the event e was recognized and processed. More...

virtual bool	eventFilter (QObject , QEvent )
	Filters events if this object has been installed as an event filter for the watched object. More...

template<typename T >
T	findChild (const QString &aName=QString()) const
	Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. More...

template<typename T >
QList< T >	findChildren (const QString &aName=QString()) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. More...

template<typename T >
QList< T >	findChildren (const QRegExp &re) const

bool	inherits (const char *classname) const
	Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false. More...

void	installEventFilter (QObject *)
	Installs an event filter filterObj on this object. More...

bool	isWidgetType () const
	Returns true if the object is a widget; otherwise returns false. More...

void	killTimer (int id)
	Kills the timer with timer identifier, id. More...

virtual const QMetaObject *	metaObject () const
	Returns a pointer to the meta-object of this object. More...

void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children. More...

QString	objectName () const

QObject *	parent () const
	Returns a pointer to the parent object. More...

QVariant	property (const char *name) const
	Returns the value of the object's name property. More...

Q_INVOKABLE	QObject (QObject *parent=0)
	Constructs an object with parent object parent. More...

void	removeEventFilter (QObject *)
	Removes an event filter object obj from this object. More...

void	setObjectName (const QString &name)

void	setParent (QObject *)
	Makes the object a child of parent. More...

bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value. More...

void	setUserData (uint id, QObjectUserData *data)

bool	signalsBlocked () const
	Returns true if signals are blocked; otherwise returns false. More...

int	startTimer (int interval)
	Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. More...

QThread *	thread () const
	Returns the thread in which the object lives. More...

QObjectUserData *	userData (uint id) const

virtual	~QObject ()
	Destroys the object, deleting all its child objects. More...

Properties
int	b

int	bottom
	the validator's lowest acceptable value More...

int	t

int	top
	the validator's highest acceptable value More...

Additional Inherited Members
Public Types inherited from QValidator
enum	State { Invalid, Intermediate, Acceptable }
	This enum type defines the states in which a validated string can exist. More...

Public Slots inherited from QObject
void	deleteLater ()
	Schedules this object for deletion. More...

Signals inherited from QObject
void	destroyed (QObject *=0)
	This signal is emitted immediately before the object obj is destroyed, and can not be blocked. More...

Static Public Functions inherited from QObject
static bool	connect (const QObject sender, const char signal, const QObject receiver, const char member, Qt::ConnectionType=Qt::AutoConnection)
	Creates a connection of the given type from the signal in the sender object to the method in the receiver object. More...

static bool	connect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)

static bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char member)
	Disconnects signal in object sender from method in object receiver. More...

static bool	disconnect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &member)

static uint	registerUserData ()

static QString	tr (const char sourceText, const char comment=0, int n=-1)

static QString	trUtf8 (const char sourceText, const char comment=0, int n=-1)

Static Public Variables inherited from QObject
static const QMetaObject	staticMetaObject
	This variable stores the meta-object for the class. More...

Protected Functions inherited from QValidator
	QValidator (QObjectPrivate &d, QObject *parent)

	QValidator (QValidatorPrivate &d, QObject *parent)

Protected Functions inherited from QObject
virtual void	childEvent (QChildEvent *)
	This event handler can be reimplemented in a subclass to receive child events. More...

virtual void	connectNotify (const char *signal)
	This virtual function is called when something has been connected to signal in this object. More...

virtual void	customEvent (QEvent *)
	This event handler can be reimplemented in a subclass to receive custom events. More...

virtual void	disconnectNotify (const char *signal)
	This virtual function is called when something has been disconnected from signal in this object. More...

	QObject (QObjectPrivate &dd, QObject *parent=0)

int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal. More...

QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns 0. More...

int	senderSignalIndex () const

virtual void	timerEvent (QTimerEvent *)
	This event handler can be reimplemented in a subclass to receive timer events for the object. More...

Protected Variables inherited from QObject
QScopedPointer< QObjectData >	d_ptr

Static Protected Variables inherited from QObject
static const QMetaObject	staticQtMetaObject

Related Functions inherited from QObject
T	qFindChildqFindChildren (const QObject *obj, const QString &name)()

QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()

QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QRegExp &regExp)()

T *	qobject_cast (QObject *object)

	QObjectList

void *	qt_find_obj_child (QObject parent, const char type, const QString &name)
	Returns a pointer to the object named name that inherits type and with a given parent. More...

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, 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, QRegExpValidator, {Line Edits Example}

Definition at line 96 of file qvalidator.h.

Constructors and Destructors

◆ QIntValidator() [1/2]

QIntValidator::QIntValidator ( QObject * parent = 0 )

explicit

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

Definition at line 291 of file qvalidator.cpp.

Referenced by QIntValidator().

     : QValidator(parent)
 {
     b = INT_MIN;
     t = INT_MAX;
 }

◆ QIntValidator() [2/2]

QIntValidator::QIntValidator	(	int	bottom,
		int	top,
		QObject *	parent = `0`
	)

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

Definition at line 304 of file qvalidator.cpp.

     : QValidator(parent)
 {
     b = minimum;
     t = maximum;
 }

◆ ~QIntValidator()

QIntValidator::~QIntValidator ( )

Destroys the validator.

Definition at line 357 of file qvalidator.cpp.

 {
     // nothing
 }

Functions

◆ bottom()

int QIntValidator::bottom ( ) const

inline

Definition at line 114 of file qvalidator.h.

Referenced by setRange(), and setTop().

114 { return b; }

QIntValidator::b

int b

Definition: qvalidator.h:126

◆ fixup()

void QIntValidator::fixup ( QString & input ) const

virtual

Reimplemented Function

Reimplemented from QValidator.

Definition at line 441 of file qvalidator.cpp.

 {
     QByteArray buff;
     if (!locale().d()->validateChars(input, QLocalePrivate::IntegerMode, &buff)) {
         QLocale cl(QLocale::C);
         if (!cl.d()->validateChars(input, QLocalePrivate::IntegerMode, &buff))
             return;
     }
     bool ok, overflow;
     qlonglong entered = QLocalePrivate::bytearrayToLongLong(buff.constData(), 10, &ok, &overflow);
     if (ok && !overflow)
         input = locale().toString(entered);
 }

◆ setBottom()

void QIntValidator::setBottom ( int bottom )

Definition at line 479 of file qvalidator.cpp.

 {
     setRange(bottom, top());
 }

◆ setRange()

void QIntValidator::setRange	(	int	bottom,
		int	top
	)

virtual

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

Definition at line 460 of file qvalidator.cpp.

Referenced by setBottom(), and setTop().

 {
     b = bottom;
     t = top;
 }

◆ setTop()

void QIntValidator::setTop ( int top )

Definition at line 496 of file qvalidator.cpp.

 {
     setRange(bottom(), top);
 }

◆ top()

int QIntValidator::top ( ) const

inline

Definition at line 115 of file qvalidator.h.

Referenced by setBottom(), and setRange().

115 { return t; }

QIntValidator::t

int t

Definition: qvalidator.h:127

◆ validate()

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 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.

Definition at line 400 of file qvalidator.cpp.

 {
     QByteArray buff;
     if (!locale().d()->validateChars(input, QLocalePrivate::IntegerMode, &buff)) {
         QLocale cl(QLocale::C);
         if (!cl.d()->validateChars(input, QLocalePrivate::IntegerMode, &buff))
             return Invalid;
     }
 
     if (buff.isEmpty())
         return Intermediate;
 
     if (b >= 0 && buff.startsWith('-'))
         return Invalid;
 
     if (t < 0 && buff.startsWith('+'))
         return Invalid;
 
     if (buff.size() == 1 && (buff.at(0) == '+' || buff.at(0) == '-'))
         return Intermediate;
 
     bool ok, overflow;
     qlonglong entered = QLocalePrivate::bytearrayToLongLong(buff.constData(), 10, &ok, &overflow);
     if (overflow || !ok)
         return Invalid;
 
     if (entered >= b && entered <= t) {
         locale().toInt(input, &ok, 10);
         return ok ? Acceptable : Intermediate;
     }
 
     if (entered >= 0) {
         // the -entered < b condition is necessary to allow people to type
         // the minus last (e.g. for right-to-left languages)
         return (entered > t && -entered < b) ? Invalid : Intermediate;
     } else {
         return (entered < b) ? Invalid : Intermediate;
     }
 }

Properties

◆ b

int QIntValidator::b

private

Definition at line 126 of file qvalidator.h.

Referenced by QIntValidator(), setRange(), and validate().

◆ bottom

QIntValidator::bottom

private

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()

Definition at line 99 of file qvalidator.h.

◆ t

int QIntValidator::t

private

Definition at line 127 of file qvalidator.h.

Referenced by QIntValidator(), setRange(), and validate().

◆ top

QIntValidator::top

private

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()

Definition at line 100 of file qvalidator.h.

The documentation for this class was generated from the following files:

/src/gui/widgets/qvalidator.h
/src/gui/widgets/qvalidator.cpp

Public Functions

Properties

Additional Inherited Members

Detailed Description

Constructors and Destructors

◆ QIntValidator() [1/2]

◆ QIntValidator() [2/2]

◆ ~QIntValidator()

Functions

◆ bottom()

◆ fixup()

◆ setBottom()

◆ setRange()

◆ setTop()

◆ top()

◆ validate()

Properties

◆ b

◆ bottom

◆ t

◆ top