class QHBarModelMapper#

The QHBarModelMapper class is a horizontal model mapper for bar series. More…

Synopsis#

Properties#

columnCountᅟ - Number of columns of the model that are mapped as the data for the bar series
firstBarSetRowᅟ - Row of the model that is used as the data source for the first bar set
firstColumnᅟ - Column of the model that contains the first values of the bar sets in the bar series
lastBarSetRowᅟ - Row of the model that is used as the data source for the last bar set
modelᅟ - Defines the model that is used by the mapper

Signals#

def columnCountChanged()
def firstBarSetRowChanged()
def firstColumnChanged()
def lastBarSetRowChanged()
def modelReplaced()
def seriesReplaced()

Note

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Detailed Description#

Model mappers enable using a data model derived from the QAbstractItemModel class as a data source for a chart. A horizontal model mapper is used to create a connection between a data model and QAbstractBarSeries , so that each row in the data model defines a bar set and each column 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.

See also

QVBarModelMapper

Note

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

property columnCountᅟ: int#

This property holds The number of columns 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 columns in the model).

Access functions:

columnCount()
setColumnCount()
Signal columnCountChanged()

property firstBarSetRowᅟ: int#

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

The default value is -1 (invalid mapping).

Access functions:

firstBarSetRow()
setFirstBarSetRow()
Signal firstBarSetRowChanged()

property firstColumnᅟ: int#

This property holds The column 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:

firstColumn()
setFirstColumn()
Signal firstColumnChanged()

property lastBarSetRowᅟ: int#

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

The default value is -1 (invalid mapping).

Access functions:

lastBarSetRow()
setLastBarSetRow()
Signal lastBarSetRowChanged()

property modelᅟ: QAbstractItemModel#

This property Defines the model that is used by the mapper..

Access functions:

Signal modelReplaced()

__init__([parent=None])#

Parameters:: parent – QObject

Constructs a mapper object that is a child of parent.

columnCount()#

Return type:: int

See also

setColumnCount()

Getter of property columnCountᅟ .

columnCountChanged()#

This signal is emitted when the number of columns changes.

Notification signal of property columnCountᅟ .

firstBarSetRow()#

Return type:: int

See also

setFirstBarSetRow()

Getter of property firstBarSetRowᅟ .

firstBarSetRowChanged()#

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

Notification signal of property firstBarSetRowᅟ .

firstColumn()#

Return type:: int

See also

setFirstColumn()

Getter of property firstColumnᅟ .

firstColumnChanged()#

This signal is emitted when the first column changes.

Notification signal of property firstColumnᅟ .

lastBarSetRow()#

Return type:: int

See also

setLastBarSetRow()

Getter of property lastBarSetRowᅟ .

lastBarSetRowChanged()#

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

Notification signal of property lastBarSetRowᅟ .

modelReplaced()#

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

Notification signal of property modelᅟ .

seriesReplaced()#

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

setColumnCount(columnCount)#

Parameters:: columnCount – int

See also

columnCount()

Setter of property columnCountᅟ .

setFirstBarSetRow(firstBarSetRow)#

Parameters:: firstBarSetRow – int

See also

firstBarSetRow()

Setter of property firstBarSetRowᅟ .

setFirstColumn(firstColumn)#

Parameters:: firstColumn – int

See also

firstColumn()

Setter of property firstColumnᅟ .

setLastBarSetRow(lastBarSetRow)#

Parameters:: lastBarSetRow – int

See also

lastBarSetRow()

Setter of property lastBarSetRowᅟ .