QSpinBox 类提供自旋框 Widget。 更多...
继承 QAbstractSpinBox .
QSpinBox 类提供自旋框 Widget。
QSpinBox is designed to handle integers and discrete sets of values (e.g., month names); use QDoubleSpinBox for floating point 值。
QSpinBox allows the user to choose a value by clicking the up/down buttons or pressing up/down on the keyboard to increase/decrease the value currently displayed. The user can also type the value in manually. The spin box supports integer values but can be extended to use different strings with validate (), textFromValue () 和 valueFromText ().
Every time the value changes QSpinBox emits the valueChanged () signals. The current value can be fetched with value () and set with setValue ().
Clicking the up/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 behaviour 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 () 和 setSingleStep ().
Most spin boxes are directional, but QSpinBox can also operate as a circular spin box, i.e. if the range is 0-99 and the current value is 99, clicking "up" will give 0 if wrapping () 被设为 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 () 和 setSuffix (). The text in the spin box is retrieved with text () (which includes any prefix () 和 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 QSpinBox.
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A spin box shown in the Windows XP widget style . |
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A spin box shown in the Plastique widget style . |
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A spin box shown in the Macintosh widget style . |
If using prefix (), suffix ()，和 specialValueText () don't provide enough control, you subclass QSpinBox and reimplement valueFromText () 和 textFromValue (). For example, here's the code for a custom spin box that allows the user to enter icon sizes (e.g., "32 x 32"):
int IconSizeSpinBox.valueFromText(const QString &text) const { QRegExp regExp(tr("(\\d+)(\\s*[xx]\\s*\\d+)?")); if (regExp.exactMatch(text)) { return regExp.cap(1).toInt(); } else { return 0; } } QString IconSizeSpinBox.textFromValue(int value) const { return tr("%1 x %1").arg(value); }
见 Icons example for the full source code.
parent argument, if not None, causes self to be owned by Qt instead of PyQt.
Constructs a spin box with 0 as minimum value and 99 as maximum value, a step value of 1. The value is initially set to 0. It is parented to parent .
另请参阅 setMinimum (), setMaximum ()，和 setSingleStep ().
重实现自 QObject.event ().
重实现自 QAbstractSpinBox.fixup ().
Convenience function to set the minimum ，和 maximum values with a single function call.
setRange(minimum, maximum);
相当于：
setMinimum(minimum); setMaximum(maximum);
This method is also a Qt slot with the C++ signature void setValue(int) .
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 in the standard way using QWidget.locale ().toString(), but with the thousand separator removed. Reimplementations may return anything. (See the example in the detailed description.)
注意： QSpinBox 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 () 和 validate ()
另请参阅 valueFromText (), validate ()，和 QLocale.groupSeparator ().
重实现自 QAbstractSpinBox.validate ().
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.
注意： QSpinBox handles specialValueText () separately; this function is only concerned with the other 值。
另请参阅 textFromValue () 和 validate ().
This is the default overload of this signal.
This signal is emitted whenever the spin box's value is changed. The new value's integer value is passed in i .
这是重载函数。
The new value is passed literally in text with no prefix () 或 suffix ().