The QDoubleValidator class provides range checking of floating-point numbers. More...

Inheritance diagram for QDoubleValidator:

Public Types
enum	Notation

Public Types inherited from QValidator
enum	State

Public Signals
void	bottomChanged (double newValue)

void	decimalsChanged (int decimals)

void	notationChanged (QDoubleValidator::Notation notation)

void	topChanged (double 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
	QDoubleValidator (double minimum, double maximum, int decimals, QObject *parent=nullptr)

	QDoubleValidator (QObject *parent=nullptr)

	~QDoubleValidator ()

double	bottom () const

int	decimals () const

Notation	notation () const

void	setBottom (double newValue)

void	setDecimals (int decimals)

void	setNotation (Notation notation)

virtual void	setRange (double minimum, double maximum, int decimals=0)

void	setTop (double newValue)

double	top () const

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

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

	~QValidator ()

virtual void	fixup (QString &input) const

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

	decimals

	notation

	top

Properties inherited from QObject
	objectName

Additional Inherited Members
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 QDoubleValidator class provides range checking of floating-point numbers. QDoubleValidator provides an upper bound, a lower bound, and a limit on the number of digits after the decimal point. It does not provide a fixup() method.

You can set the acceptable range in one call with setRange(), or with setBottom() and setTop(). Set the number of decimal places with setDecimals(). The validate() function returns the validation state.

QDoubleValidator uses its locale() to interpret the number. For example, in the German locale, "1,234" will be accepted as the fractional number 1.234. In Arabic locales, QDoubleValidator will accept Arabic digits.

In addition, QDoubleValidator is always guaranteed to accept a number formatted according to the "C" locale. QDoubleValidator will not accept numbers with thousand-separators.

See also: QIntValidator, QRegularExpressionValidator

Member Enumeration Documentation

enum QDoubleValidator::Notation

This enum defines the allowed notations for entering a double.

Constant	Value	Description
`QDoubleValidator::StandardNotation`	`0`	The string is written as a standard number (i.e. 0.015).
`QDoubleValidator::ScientificNotation`	`1`	The string is written in scientific form. It may have an exponent part(i.e. 1.5E-2).

Constructor & Destructor Documentation

QDoubleValidator::QDoubleValidator ( QObject * parent = nullptr )

explicit

Constructs a validator object with a parent object that accepts any double.

QDoubleValidator::QDoubleValidator	(	double	minimum,
		double	maximum,
		int	decimals,
		QObject *	parent = `nullptr`
	)

Constructs a validator object with a parent object. This validator will accept doubles from bottom to top inclusive, with up to decimals digits after the decimal point.

QDoubleValidator::~QDoubleValidator ( )

Destroys the validator.

Method Documentation

double QDoubleValidator::bottom ( ) const

inline

Returns the value of the property.

void QDoubleValidator::bottomChanged ( double newValue )

signal

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

int QDoubleValidator::decimals ( ) const

inline

Returns the value of the property.

void QDoubleValidator::decimalsChanged ( int decimals )

signal

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

Notation QDoubleValidator::notation ( ) const

Returns the value of the property.

void QDoubleValidator::notationChanged ( QDoubleValidator::Notation notation )

signal

Returns an icon for the file described by notation.

void QDoubleValidator::setBottom ( double newValue )

Sets the value of the property to newValue.

void QDoubleValidator::setDecimals ( int decimals )

Sets the value of the property to decimals.

void QDoubleValidator::setNotation ( Notation notation )

Sets the value of the property to newValue.

void QDoubleValidator::setRange	(	double	minimum,
		double	maximum,
		int	decimals = `0`
	)

virtual

Sets the validator to accept doubles from minimum to maximum inclusive, with at most decimals digits after the decimal point.

void QDoubleValidator::setTop ( double newValue )

Sets the value of the property to newValue.

double QDoubleValidator::top ( ) const

inline

Returns the value of the property.

void QDoubleValidator::topChanged ( double newValue )

signal

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

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

overridevirtual

The implementation in QDoubleValidator ignores the pos parameter.

Returns Acceptable if the string input contains a double that is within the valid range and is in the correct format.

Returns Intermediate if input contains a double that is outside the range or is in the wrong format. For example with too many digits after the decimal point or is empty.

Returns Invalid if the input is not a double. If the valid range consists of positive values and input is a negative number then Invalid is returned.

If notation() is set to StandardNotation and the input contains more digits before the decimal point than any number in the valid range Invalid is returned.

If notation() is ScientificNotation and the input is not in the valid range, Intermediate is returned.

Implements QValidator::validate()

Property Documentation

QDoubleValidator::bottom

This property holds the validator's minimum acceptable value. By default, this property contains a value of -infinity.

See also: setRange()

Properties	Class Methods
read	bottom
write	setBottom
notify	bottomChanged

QDoubleValidator::decimals

This property holds the validator's maximum number of digits after the decimal point. By default, this property contains a value of 1000.

See also: setRange()

Properties	Class Methods
read	decimals
write	setDecimals
notify	decimalsChanged

QDoubleValidator::notation

This property holds the notation of how a string can describe a number. By default, this property is set to ScientificNotation.

See also: Notation

Properties	Class Methods
read	notation
write	setNotation
notify	notationChanged

QDoubleValidator::top

This property holds the validator's maximum acceptable value.By default, this property contains a value of infinity.

See also: setRange()

Properties	Class Methods
read	top
write	setTop
notify	topChanged

Public Types

Public Signals

Public Methods

Properties

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Method Documentation

Property Documentation