QVBarModelMapper

The QVBarModelMapper class is a vertical model mapper for bar series. More…

Synopsis

Functions

• def firstBarSetColumn ()

• def firstRow ()

• def lastBarSetColumn ()

• def rowCount ()

• def setFirstBarSetColumn (firstBarSetColumn)

• def setFirstRow (firstRow)

• def setLastBarSetColumn (lastBarSetColumn)

• def setRowCount (rowCount)

Signals

• def firstBarSetColumnChanged ()

• def firstRowChanged ()

• def lastBarSetColumnChanged ()

• def modelReplaced ()

• def rowCountChanged ()

• def seriesReplaced ()

Detailed Description

Model mappers enable using a data model derived from the 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.

For more information, see BarModelMapper Example .

See also

QHBarModelMapper

class PySide6.QtCharts.QVBarModelMapper([parent=None])

Parameters

parent – PySide6.QtCore.QObject

Constructs a mapper object that is a child of parent.

PySide6.QtCharts.QVBarModelMapper.firstBarSetColumn()

Return type

int

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

The default value is -1 (invalid mapping).

PySide6.QtCharts.QVBarModelMapper.firstBarSetColumnChanged()

PySide6.QtCharts.QVBarModelMapper.firstRow()

Return type

int

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

The minimum and default value is 0.

PySide6.QtCharts.QVBarModelMapper.firstRowChanged()

PySide6.QtCharts.QVBarModelMapper.lastBarSetColumn()

Return type

int

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

The default value is -1 (invalid mapping).

PySide6.QtCharts.QVBarModelMapper.lastBarSetColumnChanged()

PySide6.QtCharts.QVBarModelMapper.modelReplaced()

PySide6.QtCharts.QVBarModelMapper.rowCount()

Return type

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).

PySide6.QtCharts.QVBarModelMapper.rowCountChanged()

PySide6.QtCharts.QVBarModelMapper.seriesReplaced()

PySide6.QtCharts.QVBarModelMapper.setFirstBarSetColumn(firstBarSetColumn)

Parameters

firstBarSetColumn – int

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

The default value is -1 (invalid mapping).

PySide6.QtCharts.QVBarModelMapper.setFirstRow(firstRow)

Parameters

firstRow – int

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

The minimum and default value is 0.

PySide6.QtCharts.QVBarModelMapper.setLastBarSetColumn(lastBarSetColumn)

Parameters

lastBarSetColumn – int

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

The default value is -1 (invalid mapping).

PySide6.QtCharts.QVBarModelMapper.setRowCount(rowCount)

Parameters

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).