QVXYModelMapper 类

QVXYModelMapper 类是一个用于直线、样条线及散点系列的垂直模型映射器。 更多...

头: #include <QVXYModelMapper>
实例化: VXYModelMapper
继承: QXYModelMapper

特性

公共函数

QVXYModelMapper (QObject * parent = nullptr)
int firstRow () const
QAbstractItemModel * model () const
int rowCount () const
QXYSeries * series () const
void setFirstRow (int firstRow )
void setModel (QAbstractItemModel * model )
void setRowCount (int rowCount )
void setSeries (QXYSeries * series )
void setXColumn (int xColumn )
void setYColumn (int yColumn )
int xColumn () const
int yColumn () const

信号

void firstRowChanged ()
void modelReplaced ()
void rowCountChanged ()
void seriesReplaced ()
void xColumnChanged ()
void yColumnChanged ()

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 line, spline, or scatter series and the data model that has X and Y columns for the coordinates and holds the data points for the XYSeries as rows. A TableModel is a natural choice for the model.

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

另请参阅 QHXYModelMapper , QXYSeries ,和 模型数据范例 .

特性文档编制

firstRow : int

This property holds the row of the model that contains the data for the first point of the 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 ()

model : QAbstractItemModel *

此特性保持映射器使用的模型。

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 series.

The minimum and default value is -1 (the number is limited by 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 : QtCharts::QXYSeries *

This property holds the 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:

QXYSeries * series () const
void setSeries (QXYSeries * series )

通知程序信号:

void seriesReplaced ()

xColumn : int

This property holds the column of the model that contains the x-coordinates of data points.

默认值为 -1 (无效映射)。

访问函数:

int xColumn () const
void setXColumn (int xColumn )

通知程序信号:

void xColumnChanged ()

yColumn : int

This property holds the column of the model that contains the y-coordinates of data points.

默认值为 -1 (无效映射)。

访问函数:

int yColumn () const
void setYColumn (int yColumn )

通知程序信号:

void yColumnChanged ()

成员函数文档编制

QVXYModelMapper:: QVXYModelMapper ( QObject * parent = nullptr)

构造映射器对象为子级化 parent .

[signal] void QVXYModelMapper:: 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 QVXYModelMapper:: 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 QVXYModelMapper:: 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 QVXYModelMapper:: seriesReplaced ()

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

注意: 通知程序信号对于特性 series .

[signal] void QVXYModelMapper:: xColumnChanged ()

This signal is emitted when the column that contains the x-coordinates of data points changes.

注意: 通知程序信号对于特性 xColumn .

[signal] void QVXYModelMapper:: yColumnChanged ()

This signal is emitted when the column that contains the y-coordinates of data points changes.

注意: 通知程序信号对于特性 yColumn .