内容

• 特性
• 公共函数
• 信号
• 详细描述

QVBarModelMapper 类

QVBarModelMapper 类是用于条形系列的垂直模型映射器。 更多...

头：	#include <QVBarModelMapper>
实例化：	VBarModelMapper
继承：	QObject

• 所有成员列表，包括继承成员

特性

firstBarSetColumn : int firstRow : int lastBarSetColumn : int

model : QAbstractItemModel* rowCount : int series : QAbstractBarSeries*

公共函数

	QVBarModelMapper (QObject * parent = nullptr)
int	firstBarSetColumn () const
int	firstRow () const
int	lastBarSetColumn () const
QAbstractItemModel *	model () const
int	rowCount () const
QAbstractBarSeries *	series () const
void	setFirstBarSetColumn (int firstBarSetColumn )
void	setFirstRow (int firstRow )
void	setLastBarSetColumn (int lastBarSetColumn )
void	setModel (QAbstractItemModel * model )
void	setRowCount (int rowCount )
void	setSeries (QAbstractBarSeries * series )

信号

void	firstBarSetColumnChanged ()
void	firstRowChanged ()
void	lastBarSetColumnChanged ()
void	modelReplaced ()
void	rowCountChanged ()
void	seriesReplaced ()

详细描述

模型映射器允许使用的数据模型派生自 QAbstractItemModel class as a data source for a chart. A vertical model mapper is used to create a connection between a data model and QAbstractBarSeries , so that each column in the data model defines a bar set and each row maps to a category in a bar series.

Both model and bar series properties can be used to manipulate the data. The model mapper keeps the bar series and the data model in sync.

The model mapper ensures that all the bar sets in the bar series have equal sizes. Therefore, adding or removing a value from a bar set causes the same change to be made in all the bar sets in the bar series.

更多信息，见 BarModelMapper 范例 .

另请参阅 QHBarModelMapper .

特性文档编制

firstBarSetColumn : int

This property holds the column of the model that is used as the data source for the first bar set.

默认值为 -1 (无效映射)。

访问函数：

int	firstBarSetColumn () const
void	setFirstBarSetColumn (int firstBarSetColumn )

通知程序信号：

void	firstBarSetColumnChanged ()

firstRow : int

This property holds the row of the model that contains the first values of the bar sets in the bar series.

最小且默认值为 0。

访问函数：

int	firstRow () const
void	setFirstRow (int firstRow )

通知程序信号：

void	firstRowChanged ()

lastBarSetColumn : int

This property holds the column of the model that is used as the data source for the last bar set.

默认值为 -1 (无效映射)。

访问函数：

int	lastBarSetColumn () const
void	setLastBarSetColumn (int lastBarSetColumn )

通知程序信号：

void	lastBarSetColumnChanged ()

model : QAbstractItemModel *

This property holds the data model that is used by the mapper.

访问函数：

QAbstractItemModel *	model () const
void	setModel (QAbstractItemModel * model )

通知程序信号：

void	modelReplaced ()

rowCount : int

This property holds the number of rows of the model that are mapped as the data for the bar series.

The minimum and default value is -1 (number limited to the number of rows in the model).

访问函数：

int	rowCount () const
void	setRowCount (int rowCount )

通知程序信号：

void	rowCountChanged ()

series : QAbstractBarSeries *

This property holds the bar series that is used by the mapper.

All the data in the series is discarded when it is set to the mapper. When a new series is specified, the old series is disconnected (but it preserves its data).

访问函数：

QAbstractBarSeries *	series () const
void	setSeries (QAbstractBarSeries * series )

通知程序信号：

void	seriesReplaced ()

成员函数文档编制

QVBarModelMapper:: QVBarModelMapper ( QObject * parent = nullptr)

构造映射器对象为子级化 parent .

[signal] void QVBarModelMapper:: firstBarSetColumnChanged ()

This signal is emitted when the first bar set column changes.

注意： 通知程序信号对于特性 firstBarSetColumn .

[signal] void QVBarModelMapper:: firstRowChanged ()

This signal is emitted when the first row changes.

注意： 通知程序信号对于特性 firstRow .

[signal] void QVBarModelMapper:: lastBarSetColumnChanged ()

This signal is emitted when the last bar set column changes.

注意： 通知程序信号对于特性 lastBarSetColumn .

[signal] void QVBarModelMapper:: modelReplaced ()

This signal is emitted when the model that the mapper is connected to changes.

注意： 通知程序信号对于特性 model .

[signal] void QVBarModelMapper:: rowCountChanged ()

This signal is emitted when the number of rows changes.

注意： 通知程序信号对于特性 rowCount .

[signal] void QVBarModelMapper:: seriesReplaced ()

This signal is emitted when the bar series that the mapper is connected to changes.

注意： 通知程序信号对于特性 series .