QBarCategoryAxis 类

The QBarCategoryAxis class adds categories to a graph's axes. 更多...

头：	#include <QBarCategoryAxis>
CMake:	find_package(Qt6 REQUIRED COMPONENTS Graphs) target_link_libraries(mytarget PRIVATE Qt6::Graphs)
qmake:	QT += graphs
在 QML：	BarCategoryAxis
继承：	QAbstractAxis

• 所有成员列表，包括继承成员
• QBarCategoryAxis is part of Qt Graphs C++ Classes for 2D .

特性

• categories : QStringList
• count : const qsizetype
• max : QString
• min : QString

公共函数

	QBarCategoryAxis (QObject * parent = nullptr)
virtual	~QBarCategoryAxis () override
void	append (const QString & category )
void	append (const QStringList & categories )
QString	at (qsizetype index ) const
QStringList	categories ()
void	clear ()
qsizetype	count () const
void	insert (qsizetype index , const QString & category )
QString	max () const
QString	min () const
void	remove (const QString & category )
void	remove (qsizetype index )
void	replace (const QString & oldCategory , const QString & newCategory )
void	setCategories (const QStringList & categories )
void	setMax (const QString & max )
void	setMin (const QString & min )
void	setRange (const QString & minCategory , const QString & maxCategory )

重实现公共函数

virtual QAbstractAxis::AxisType

type () const override

信号

void	categoriesChanged ()
void	countChanged ()
void	maxChanged (const QString & max )
void	minChanged (const QString & min )

详细描述

QBarCategoryAxis can be set up to show an axis line with tick marks, grid lines, and shades. Categories are drawn between the ticks.

特性文档编制

categories : QStringList

This property holds the categories of an axis.

访问函数：

QStringList	categories ()
void	setCategories (const QStringList & categories )

通知程序信号：

void	categoriesChanged ()

[read-only] count : const qsizetype

This property holds the number of categories of an axis.

访问函数：

qsizetype

count () const

通知程序信号：

void	countChanged ()

max : QString

此特性保持轴的最大值。

The maximum value on the axis. The given value should be contained in categories .

访问函数：

QString	max () const
void	setMax (const QString & max )

通知程序信号：

void	maxChanged (const QString & max )

min : QString

此特性保持轴的最小值。

The minimum value on the axis. The given value should be contained in categories .

访问函数：

QString	min () const
void	setMin (const QString & min )

通知程序信号：

void	minChanged (const QString & min )

成员函数文档编制

[explicit] QBarCategoryAxis:: QBarCategoryAxis ( QObject * parent = nullptr)

Constructs an axis object that is the child of parent .

[override virtual noexcept] QBarCategoryAxis:: ~QBarCategoryAxis ()

Destroys the axis object.

[invokable] void QBarCategoryAxis:: append (const QString & category )

追加 category to an axis. The maximum value on the axis will be changed to match the last category . If no categories were previously defined, the minimum value on the axis will also be changed to match category .

A category has to be a valid QString and it cannot be duplicated. Duplicated categories will not be appended.

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

[invokable] void QBarCategoryAxis:: append (const QStringList & categories )

追加 categories to an axis. The maximum value on the axis will be changed to match the last category in categories . If no categories were previously defined, the minimum value on the axis will also be changed to match the first category in categories .

A category has to be a valid QString and it cannot be duplicated. Duplicated categories will not be appended.

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

[invokable] QString QBarCategoryAxis:: at ( qsizetype index ) const

Returns the category at index .

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

QStringList QBarCategoryAxis:: categories ()

Returns categories.

注意： Getter function for property categories.

另请参阅 setCategories ().

[invokable] void QBarCategoryAxis:: clear ()

Removes all categories. Sets the maximum and minimum values of the axis range to QString::null.

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

qsizetype QBarCategoryAxis:: count () const

Returns the number of categories.

注意： getter 函数对于特性 count。

[invokable] void QBarCategoryAxis:: insert ( qsizetype index , const QString & category )

插入 category to the axis at index . category has to be a valid QString and it cannot be duplicated. If category is prepended or appended to other categories, the minimum and maximum values on the axis are updated accordingly.

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

QString QBarCategoryAxis:: max () const

Returns the maximum category.

注意： Getter function for property max.

另请参阅 setMax ().

QString QBarCategoryAxis:: min () const

Returns the minimum category.

注意： Getter function for property min.

另请参阅 setMin ().

[invokable] void QBarCategoryAxis:: remove (const QString & category )

移除 category from the axis. Removing a category that currently sets the maximum or minimum value on the axis will affect the axis range.

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

[invokable] void QBarCategoryAxis:: remove ( qsizetype index )

Removes a category at index from the axis. Removing a category that currently sets the maximum or minimum value on the axis will affect the axis range.

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

[invokable] void QBarCategoryAxis:: replace (const QString & oldCategory , const QString & newCategory )

替换 oldCategory with newCategory 。若 oldCategory does not exist on the axis, nothing is done. newCategory has to be a valid QString and it cannot be duplicated. If the minimum or maximum category is replaced, the minimum and maximum values on the axis are updated accordingly.

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

void QBarCategoryAxis:: setCategories (const QStringList & categories )

设置 categories and discards the old ones. The axis range is adjusted to match the first and last category in categories .

A category has to be a valid QString and it cannot be duplicated.

注意： setter 函数对于特性 categories .

另请参阅 categories ().

void QBarCategoryAxis:: setMax (const QString & max )

Sets the maximum category to max .

注意： setter 函数对于特性 max .

另请参阅 max ().

void QBarCategoryAxis:: setMin (const QString & min )

Sets the minimum category to min .

注意： setter 函数对于特性 min .

另请参阅 min ().

void QBarCategoryAxis:: setRange (const QString & minCategory , const QString & maxCategory )

Sets the axis range from minCategory to maxCategory .

[override virtual] QAbstractAxis::AxisType QBarCategoryAxis:: type () const

重实现： QAbstractAxis::type () const.

返回轴的类型。

内容

1. 特性

2. 公共函数

3. 重实现公共函数

4. 信号

5. 详细描述