Home · All Namespaces · All Classes · Main Classes · Grouped Classes · Modules · Functions |

[QtGui module]

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

#include <QDoubleValidator>

Inherits QValidator.

- enum
**Notation**{ StandardNotation, ScientificNotation }

- 1 property inherited from QObject

**QDoubleValidator**( QObject **parent*)- double
**bottom**() const - int
**decimals**() const - Notation
**notation**() const - void
**setBottom**( double ) - void
**setDecimals**( int ) - void
**setNotation**( Notation ) - void
**setTop**( double ) - double
**top**() const

- 4 public functions inherited from QValidator
- 29 public functions inherited from QObject

- 1 public slot inherited from QObject
- 1 signal inherited from QObject
- 5 static public members inherited from QObject
- 7 protected functions inherited from QObject

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.

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). |

This enum was introduced in Qt 4.3.

This property holds the validator's minimum acceptable value.

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

Access functions:

**double bottom () const****void setBottom ( double )**

See also setRange().

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

By default, this property contains a value of 1000.

Access functions:

**int decimals () const****void setDecimals ( int )**

See also setRange().

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

By default, this property is set to ScientificNotation.

This property was introduced in Qt 4.3.

Access functions:

**Notation notation () const****void setNotation ( Notation )**

See also Notation.

This property holds the validator's maximum acceptable value.

By default, this property contains a value of infinity.

Access functions:

**double top () const****void setTop ( double )**

See also setRange().

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

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.

Destroys the validator.

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

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.

Copyright © 2008 Nokia | Trademarks | Qt 4.4.3 |