内容

特性
公共函数
公共槽
信号
保护函数
重实现保护函数
详细描述
子类化 QSpinBox

QSpinBox 类

QSpinBox class provides a spin box widget. 更多...

头：	#include <QSpinBox>
qmake:	QT += widgets
继承：	QAbstractSpinBox

所有成员列表，包括继承成员

特性

cleanText : const QString
displayIntegerBase : int
maximum : int
minimum : int

prefix : QString
singleStep : int
suffix : QString
value : int

12 特性继承自 QAbstractSpinBox
59 特性继承自 QWidget
1 特性继承自 QObject

公共函数

	QSpinBox (QWidget * parent = Q_NULLPTR)
	~QSpinBox ()
QString	cleanText () const
int	displayIntegerBase () const
int	maximum () const
int	minimum () const
QString	prefix () const
void	setDisplayIntegerBase (int base )
void	setMaximum (int max )
void	setMinimum (int min )
void	setPrefix (const QString & prefix )
void	setRange (int minimum , int maximum )
void	setSingleStep (int val )
void	setSuffix (const QString & suffix )
int	singleStep () const
QString	suffix () const
int	value () const

30 公共函数继承自 QAbstractSpinBox
214 公共函数继承自 QWidget
32 公共函数继承自 QObject
14 公共函数继承自 QPaintDevice

公共槽

void	setValue (int val )

4 公共槽继承自 QAbstractSpinBox
19 公共槽继承自 QWidget
1 公共槽继承自 QObject

信号

void	valueChanged (int i )
void	valueChanged (const QString & text )

1 信号继承自 QAbstractSpinBox
3 信号继承自 QWidget
2 信号继承自 QObject

保护函数

virtual QString	textFromValue (int value ) const
virtual int	valueFromText (const QString & text ) const

重实现保护函数

virtual bool	event (QEvent * event ) override
virtual void	fixup (QString & input ) const override
virtual QValidator::State	validate (QString & text , int & pos ) const override

20 保护函数继承自 QAbstractSpinBox
35 保护函数继承自 QWidget
9 保护函数继承自 QObject
1 保护函数继承自 QPaintDevice

额外继承成员

5 静态公共成员继承自 QWidget
11 静态公共成员继承自 QObject
1 保护槽继承自 QWidget

详细描述

QSpinBox class provides a spin box widget.

QSpinBox is designed to handle integers and discrete sets of values (e.g., month names); use QDoubleSpinBox 为浮点值。

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 two valueChanged () signals, one providing an int and the other a QString 。 QString overload provides the value with both prefix () 和 suffix (). The current value can be fetched with value () 和设置采用 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 () 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 () 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 .

子类化 QSpinBox

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
{
    static const QRegularExpression regExp(tr("(\\d+)(\\s*[xx]\\s*\\d+)?"));
    Q_ASSERT(regExp.isValid());
    const QRegularExpressionMatch match = regExp.match(text);
    if (match.isValid())
        return match.captured(1).toInt();
    return 0;
}
QString IconSizeSpinBox::textFromValue(int value) const
{
    return tr("%1 x %1").arg(value);
}

见 Icons example for the full source code.

另请参阅 QDoubleSpinBox , QDateTimeEdit , QSlider ，和自旋框范例 .

特性文档编制

cleanText : const QString

This property holds the text of the spin box excluding any prefix, suffix, or leading or trailing whitespace.

访问函数：

QString cleanText () const

另请参阅 text , QSpinBox::prefix ，和 QSpinBox::suffix .

displayIntegerBase : int

This property holds the base used to display the value of the spin box

The default displayIntegerBase value is 10.

该特性在 Qt 5.2 引入。

访问函数：

int	displayIntegerBase () const
void	setDisplayIntegerBase (int base )

另请参阅 textFromValue () 和 valueFromText ().

maximum : int

此特性保持自旋框的最大值

When setting this property the minimum is adjusted if necessary, to ensure that the range remains valid.

默认最大值为 99。

访问函数：

int	maximum () const
void	setMaximum (int max )

另请参阅 setRange () 和 specialValueText .

minimum : int

此特性保持自旋框的最小值

When setting this property the maximum is adjusted if necessary to ensure that the range remains valid.

默认最小值为 0。

访问函数：

int	minimum () const
void	setMinimum (int min )

另请参阅 setRange () 和 specialValueText .

prefix : QString

此特性保持自旋框的前缀

前缀会被前置到显示值的开头。典型用途是显示度量单位 (或货币符号)。例如：

sb->setPrefix("$");

要关闭前缀显示，把此特性设为空字符串。默认为无前缀。前缀不显示，当 value () == minimum () 和 specialValueText () is set.

prefix() 返回空字符串，若未设置前缀。

访问函数：

QString	prefix () const
void	setPrefix (const QString & prefix )

另请参阅 suffix (), setSuffix (), specialValueText ()，和 setSpecialValueText ().

singleStep : int

此特性保持步幅值

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. Setting a singleStep value of less than 0 does nothing.

访问函数：

int	singleStep () const
void	setSingleStep (int val )

suffix : QString

此特性保持自旋框的后缀

The suffix is appended to the end of the displayed value. Typical use is to display a unit of measurement or a currency symbol. For example:

sb->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.

访问函数：

QString	suffix () const
void	setSuffix (const QString & suffix )

另请参阅 prefix (), setPrefix (), specialValueText ()，和 setSpecialValueText ().

value : int

This property holds the value of the spin box

setValue() will emit valueChanged () if the new value is different from the old one. The value property has a second notifier signal which includes the spin box's prefix and suffix.

访问函数：

int	值 () const
void	setValue (int val )

通知程序信号：

void	valueChanged (int i )
void	valueChanged (const QString & text )

成员函数文档编制

QSpinBox:: QSpinBox ( QWidget * parent = Q_NULLPTR)

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 ().

QSpinBox:: ~QSpinBox ()

析构函数。

`[override virtual protected]` bool QSpinBox:: event ( QEvent * event )

重实现自 QObject::event ().

`[override virtual protected]` void QSpinBox:: fixup ( QString & input ) const

重实现自 QAbstractSpinBox::fixup ().

void QSpinBox:: setRange ( int minimum , int maximum )

Convenience function to set the minimum ，和 maximum values with a single function call.

setRange(minimum, maximum);

相当于：

setMinimum(minimum);
setMaximum(maximum);

另请参阅 minimum and maximum .

`[virtual protected]` QString QSpinBox:: textFromValue ( int value ) const

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 unless setGroupSeparatorShown () is set. 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 ().

`[override virtual protected]` QValidator::State QSpinBox:: validate ( QString & text , int & pos ) const

重实现自 QAbstractSpinBox::validate ().

`[signal]` void QSpinBox:: valueChanged ( int i )

This signal is emitted whenever the spin box's value is changed. The new value's integer value is passed in i .

注意： 信号 valueChanged 在此类中是重载。要使用函数指针句法连接到此信号，必须在静态铸造中指定信号类型，如此范例所示：

connect(spinBox, static_cast<void(QSpinBox::*)(int)>(&QSpinBox::valueChanged),
    [=](int i){ /* ... */ });

注意： 通知程序信号对于特性 value .

`[signal]` void QSpinBox:: valueChanged (const QString & text )

这是重载函数。

The new value is passed in text with prefix () 和 suffix ().

注意： 信号 valueChanged 在此类中是重载。要使用函数指针句法连接到此信号，必须在静态铸造中指定信号类型，如此范例所示：

connect(spinBox, static_cast<void(QSpinBox::*)(const QString &)>(&QSpinBox::valueChanged),
    [=](const QString &text){ /* ... */ });

注意： 通知程序信号对于特性 value .

`[virtual protected]` int QSpinBox:: valueFromText (const QString & text ) const

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 values.

另请参阅 textFromValue () 和 validate ().

内容

QSpinBox 类

特性

公共函数

公共槽

信号

保护函数

重实现保护函数

额外继承成员

详细描述

子类化 QSpinBox

特性文档编制

cleanText : const QString

displayIntegerBase : int

maximum : int

minimum : int

prefix : QString

singleStep : int

suffix : QString

value : int

成员函数文档编制

QSpinBox:: QSpinBox ( QWidget * parent = Q_NULLPTR)

QSpinBox:: ~QSpinBox ()

[override virtual protected] bool QSpinBox:: event ( QEvent * event )

[override virtual protected] void QSpinBox:: fixup ( QString & input ) const

void QSpinBox:: setRange ( int minimum , int maximum )

[virtual protected] QString QSpinBox:: textFromValue ( int value ) const

[override virtual protected] QValidator::State QSpinBox:: validate ( QString & text , int & pos ) const

[signal] void QSpinBox:: valueChanged ( int i )

[signal] void QSpinBox:: valueChanged (const QString & text )

[virtual protected] int QSpinBox:: valueFromText (const QString & text ) const

`[override virtual protected]` bool QSpinBox:: event ( QEvent * event )

`[override virtual protected]` void QSpinBox:: fixup ( QString & input ) const

`[virtual protected]` QString QSpinBox:: textFromValue ( int value ) const

`[override virtual protected]` QValidator::State QSpinBox:: validate ( QString & text , int & pos ) const

`[signal]` void QSpinBox:: valueChanged ( int i )

`[signal]` void QSpinBox:: valueChanged (const QString & text )

`[virtual protected]` int QSpinBox:: valueFromText (const QString & text ) const