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QDoubleValidator Class Reference
[модуль QtGui]

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

 #include <QDoubleValidator>

Inherits QValidator.

• Список всех членов, включая унаследованные
• Поддерживаемые члены Qt 3

Открытые типы

• enum Notation { StandardNotation, ScientificNotation }

Свойства

• bottom : double
• decimals : int
• notation : Notation
• top : double

• 1 свойство, унаследованное от QObject

Открытые функции

• QDoubleValidator ( QObject * parent )
• QDoubleValidator ( double bottom, double top, int decimals, QObject * parent )
• ~QDoubleValidator ()
• double bottom () const
• int decimals () const
• Notation notation () const
• void setBottom ( double )
• void setDecimals ( int )
• void setNotation ( Notation )
• virtual void setRange ( double minimum, double maximum, int decimals = 0 )
• void setTop ( double )
• double top () const
• virtual QValidator::State validate ( QString & input, int & pos ) const

• 4 public functions inherited from QValidator
• 29 открытых функций, унаследованных от QObject

Дополнительные унаследованные члены

• 1 открытый слот, унаследованный от QObject
• 1 сигнал, унаследованный от QObject
• 5 статических открытых членов, унаследованных от QObject
• 7 защищенных функций, унаследованных от QObject

Подробное описание

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() function.

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-seperators.

See also QIntValidator, QRegExpValidator, and Line Edits Example.

Описание типов-членов

enum QDoubleValidator::Notation

This enum defines the allowed notations for entering a double.

Данное перечисление было введено в Qt 4.3.

Описание свойств

bottom : double

This property holds the validator's minimum acceptable value.

By default, this property contains a value of -infinity.

Функции доступа:

• double bottom () const
• void setBottom ( double )

See also setRange().

decimals : int

This property holds the validator's maximum number of digits after the decimal point.

By default, this property contains a value of 1000.

Функции доступа:

• int decimals () const
• void setDecimals ( int )

See also setRange().

notation : Notation

This property holds the notation of how a string can describe a number.

By default, this property is set to ScientificNotation.

Это свойство было введено в Qt 4.3.

Функции доступа:

• Notation notation () const
• void setNotation ( Notation )

See also Notation.

top : double

This property holds the validator's maximum acceptable value.

By default, this property contains a value of infinity.

Функции доступа:

• double top () const
• void setTop ( double )

See also setRange().

Описание функций-членов

QDoubleValidator::QDoubleValidator ( QObject * parent )

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

QDoubleValidator::QDoubleValidator ( double bottom, double top, int decimals, QObject * parent )

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.

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.

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

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; e.g. with too many digits after the decimal point or is empty.

Returns Invalid if the input is not a double.

Note: If the valid range consists of just positive doubles (e.g. 0.0 to 100.0) and input is a negative double then Invalid is returned. If notation() is set to StandardNotation, and the input contains more digits before the decimal point than a double in the valid range may have, Invalid is returned. If notation() is ScientificNotation, and the input is not in the valid range, Intermediate is returned. The value may yet become valid by changing the exponent.

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

Reimplemented from QValidator.