QDoubleSpinBox Class ReferenceThe QDoubleSpinBox class provides a spin box widget that takes doubles. Далее... #include <QDoubleSpinBox> Inherits: QAbstractSpinBox. Свойства
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Подробное описаниеThe QDoubleSpinBox class provides a spin box widget that takes doubles. QDoubleSpinBox allows the user to choose a value by clicking the up and down buttons or by pressing Up or Down on the keyboard to increase or decrease the value currently displayed. The user can also type the value in manually. The spin box supports double values but can be extended to use different strings with validate(), textFromValue() and valueFromText(). Every time the value changes QDoubleSpinBox emits the valueChanged() signal. The current value can be fetched with value() and set with setValue(). Note: QDoubleSpinBox will round numbers so they can be displayed with the current precision. In a QDoubleSpinBox with decimals set to 2, calling setValue(2.555) will cause value() to return 2.56. Clicking the up and down buttons or using the keyboard accelerator's Up and Down arrows will increase or decrease the current value in steps of size singleStep(). If you want to change this behavior you can reimplement the virtual function stepBy(). The minimum and maximum value and the step size can be set using one of the constructors, and can be changed later with setMinimum(), setMaximum() and setSingleStep(). The spinbox has a default precision of 2 decimal places but this can be changed using setDecimals(). Most spin boxes are directional, but QDoubleSpinBox can also operate as a circular spin box, i.e. if the range is 0.0-99.9 and the current value is 99.9, clicking "up" will give 0 if wrapping() is set to true. Use setWrapping() if you want circular behavior. The displayed value can be prepended and appended with arbitrary strings indicating, for example, currency or the unit of measurement. See setPrefix() and setSuffix(). The text in the spin box is retrieved with text() (which includes any prefix() and suffix()), or with cleanText() (which has no prefix(), no suffix() and no leading or trailing whitespace). It is often desirable to give the user a special (often default) choice in addition to the range of numeric values. See setSpecialValueText() for how to do this with QDoubleSpinBox. See also QSpinBox, QDateTimeEdit, QSlider, and Spin Boxes Example. Описание свойствcleanText : const QStringThis property holds the text of the spin box excluding any prefix, suffix, or leading or trailing whitespace. Функции доступа:
See also text, QDoubleSpinBox::prefix, and QDoubleSpinBox::suffix. decimals : intThis property holds the precision of the spin box, in decimals. Sets how many decimals the spinbox will use for displaying and interpreting doubles. Warning: The maximum value for decimals is DBL_MAX_10_EXP + DBL_DIG (ie. 323) because of the limitations of the double type. Note: The maximum, minimum and value might change as a result of changing this property. Функции доступа:
maximum : doubleThis property holds the maximum value of the spin box. When setting this property the minimum is adjusted if necessary, to ensure that the range remains valid. The default maximum value is 99.99. Note: The maximum value will be rounded to match the decimals property. Функции доступа:
See also decimals and setRange(). minimum : doubleThis property holds the minimum value of the spin box. When setting this property the maximum is adjusted if necessary to ensure that the range remains valid. The default minimum value is 0.0. Note: The minimum value will be rounded to match the decimals property. Функции доступа:
See also decimals, setRange(), and specialValueText. prefix : QStringThis property holds the spin box's prefix. The prefix is prepended to the start of the displayed value. Typical use is to display a unit of measurement or a currency symbol. Например: spinbox->setPrefix("$"); To turn off the prefix display, set this property to an empty string. По умолчанию префикса нет. The prefix is not displayed when value() == minimum() and specialValueText() is set. If no prefix is set, prefix() returns an empty string. Функции доступа:
See also suffix(), setSuffix(), specialValueText(), and setSpecialValueText(). singleStep : doubleThis property holds the step value. When the user uses the arrows to change the spin box's value the value will be incremented/decremented by the amount of the singleStep. The default value is 1.0. Setting a singleStep value of less than 0 does nothing. Функции доступа:
suffix : QStringThis property holds the suffix of the spin box. The suffix is appended to the end of the displayed value. Typical use is to display a unit of measurement or a currency symbol. Например: spinbox->setSuffix(" km"); To turn off the suffix display, set this property to an empty string. The default is no suffix. The suffix is not displayed for the minimum() if specialValueText() is set. If no suffix is set, suffix() returns an empty string. Функции доступа:
See also prefix(), setPrefix(), specialValueText(), and setSpecialValueText(). value : doubleThis property holds the value of the spin box. setValue() will emit valueChanged() if the new value is different from the old one. Note: The value will be rounded so it can be displayed with the current setting of decimals. Функции доступа:
Уведомляющий сигнал:
See also decimals. Описание функций-членовQDoubleSpinBox::QDoubleSpinBox ( QWidget * parent = 0 )Constructs a spin box with 0.0 as minimum value and 99.99 as maximum value, a step value of 1.0 and a precision of 2 decimal places. The value is initially set to 0.00. The spin box has the given parent. See also setMinimum(), setMaximum(), and setSingleStep(). void QDoubleSpinBox::fixup ( QString & input ) const [virtual]Reimplemented from QAbstractSpinBox::fixup(). void QDoubleSpinBox::setRange ( double minimum, double maximum )Convenience function to set the minimum and maximum values with a single function call. Note: The maximum and minimum values will be rounded to match the decimals property. setRange(minimum, maximum);
is equivalent to: setMinimum(minimum); setMaximum(maximum); QString QDoubleSpinBox::textFromValue ( double value ) const [virtual]This virtual function is used by the spin box whenever it needs to display the given value. The default implementation returns a string containing value printed using QWidget::locale().toString(value, QLatin1Char('f'), decimals()) and will remove the thousand separator. Reimplementations may return anything. Note: QDoubleSpinBox does not call this function for specialValueText() and that neither prefix() nor suffix() should be included in the return value. If you reimplement this, you may also need to reimplement valueFromText(). See also valueFromText() and QLocale::groupSeparator(). QValidator::State QDoubleSpinBox::validate ( QString & text, int & pos ) const [virtual]Reimplemented from QAbstractSpinBox::validate(). void QDoubleSpinBox::valueChanged ( double d ) [signal]This signal is emitted whenever the spin box's value is changed. The new value is passed in d. void QDoubleSpinBox::valueChanged ( const QString & text ) [signal]Это перегруженная функция. The new value is passed literally in text with no prefix() or suffix(). double QDoubleSpinBox::valueFromText ( const QString & text ) const [virtual]This virtual function is used by the spin box whenever it needs to interpret text entered by the user as a value. Subclasses that need to display spin box values in a non-numeric way need to reimplement this function. Note: QDoubleSpinBox handles specialValueText() separately; this function is only concerned with the other values. See also textFromValue() and validate(). |
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