class QVBarModelMapper#

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

Inheritance diagram of PySide6.QtCharts.QVBarModelMapper

Synopsis#

Properties#

  • firstBarSetColumnᅟ - Column of the model that is used as the data source for the first bar set

  • firstRowᅟ - Row of the model that contains the first values of the bar sets in the bar series

  • lastBarSetColumnᅟ - Column of the model that is used as the data source for the last bar set

  • modelᅟ - Data model that is used by the mapper

  • rowCountᅟ - Number of rows of the model that are mapped as the data for the bar series

Methods#

Signals#

Note

This documentation may contain snippets that were automatically translated from C++ to Python. We always welcome contributions to the snippet translation. If you see an issue with the translation, you can also let us know by creating a ticket on https:/bugreports.qt.io/projects/PYSIDE

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 Charts with Widgets Gallery .

See also

QHBarModelMapper

Note

Properties can be used directly when from __feature__ import true_property is used or via accessor functions otherwise.

property firstBarSetColumnᅟ: 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).

Access functions:
property firstRowᅟ: 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.

Access functions:
property lastBarSetColumnᅟ: 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).

Access functions:
property modelᅟ: QAbstractItemModel#

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

Access functions:
property rowCountᅟ: 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).

Access functions:
__init__([parent=None])#
Parameters:

parent – QObject

Constructs a mapper object that is a child of parent.

firstBarSetColumn()#
Return type:

int

See also

setFirstBarSetColumn()

Getter of property firstBarSetColumnᅟ .

firstBarSetColumnChanged()#

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

Notification signal of property firstBarSetColumnᅟ .

firstRow()#
Return type:

int

See also

setFirstRow()

Getter of property firstRowᅟ .

firstRowChanged()#

This signal is emitted when the first row changes.

Notification signal of property firstRowᅟ .

lastBarSetColumn()#
Return type:

int

See also

setLastBarSetColumn()

Getter of property lastBarSetColumnᅟ .

lastBarSetColumnChanged()#

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

Notification signal of property lastBarSetColumnᅟ .

modelReplaced()#

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

Notification signal of property modelᅟ .

rowCount()#
Return type:

int

See also

setRowCount()

Getter of property rowCountᅟ .

rowCountChanged()#

This signal is emitted when the number of rows changes.

Notification signal of property rowCountᅟ .

seriesReplaced()#

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

setFirstBarSetColumn(firstBarSetColumn)#
Parameters:

firstBarSetColumn – int

See also

firstBarSetColumn()

Setter of property firstBarSetColumnᅟ .

setFirstRow(firstRow)#
Parameters:

firstRow – int

See also

firstRow()

Setter of property firstRowᅟ .

setLastBarSetColumn(lastBarSetColumn)#
Parameters:

lastBarSetColumn – int

See also

lastBarSetColumn()

Setter of property lastBarSetColumnᅟ .

setRowCount(rowCount)#
Parameters:

rowCount – int

See also

rowCount()

Setter of property rowCountᅟ .