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QVPieModelMapper Class

The QVPieModelMapper is a vertical model mapper for pie series. More...

Header: #include <QVPieModelMapper>
Instantiated By: VPieModelMapper
Inherits: QPieModelMapper

Properties

Public Functions

QVPieModelMapper(QObject *parent = nullptr)
int firstRow() const
int labelsColumn() const
QAbstractItemModel *model() const
int rowCount() const
QPieSeries *series() const
void setFirstRow(int firstRow)
void setLabelsColumn(int labelsColumn)
void setModel(QAbstractItemModel *model)
void setRowCount(int rowCount)
void setSeries(QPieSeries *series)
void setValuesColumn(int valuesColumn)
int valuesColumn() const

Signals

void firstRowChanged()
void labelsColumnChanged()
void modelReplaced()
void rowCountChanged()
void seriesReplaced()
void valuesColumnChanged()

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 QPieSeries, so that each row in the data model defines a pie slice and each column maps to the label or the value of the pie slice.

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

Property Documentation

firstRow : int

This property holds the row of the model that contains the first slice value.

The minimum and default value is 0.

Access functions:

int firstRow() const
void setFirstRow(int firstRow)

Notifier signal:

void firstRowChanged()

labelsColumn : int

This property holds the column of the model that is kept in sync with the labels of the pie's slices.

The default value is -1 (invalid mapping).

Access functions:

int labelsColumn() const
void setLabelsColumn(int labelsColumn)

Notifier signal:

void labelsColumnChanged()

model : QAbstractItemModel*

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

Access functions:

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

Notifier signal:

void modelReplaced()

rowCount : int

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

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

Access functions:

int rowCount() const
void setRowCount(int rowCount)

Notifier signal:

void rowCountChanged()

series : QtCharts::QPieSeries*

This property holds the pie 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).

Access functions:

QPieSeries *series() const
void setSeries(QPieSeries *series)

Notifier signal:

void seriesReplaced()

valuesColumn : int

This property holds the column of the model that is kept in sync with the values of the pie's slices.

The default value is -1 (invalid mapping).

Access functions:

int valuesColumn() const
void setValuesColumn(int valuesColumn)

Notifier signal:

void valuesColumnChanged()

Member Function Documentation

QVPieModelMapper::QVPieModelMapper(QObject *parent = nullptr)

Constructs a mapper object that is a child of parent.

[signal] void QVPieModelMapper::firstRowChanged()

This signal is emitted when the first row changes.

Note: Notifier signal for property firstRow.

[signal] void QVPieModelMapper::labelsColumnChanged()

This signal is emitted when the labels column changes.

Note: Notifier signal for property labelsColumn.

[signal] void QVPieModelMapper::modelReplaced()

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

Note: Notifier signal for property model.

[signal] void QVPieModelMapper::rowCountChanged()

This signal is emitted when the number of rows changes.

Note: Notifier signal for property rowCount.

[signal] void QVPieModelMapper::seriesReplaced()

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

Note: Notifier signal for property series.

[signal] void QVPieModelMapper::valuesColumnChanged()

This signal is emitted when the values column changes.

Note: Notifier signal for property valuesColumn.

int QVPieModelMapper::labelsColumn() const

Returns the column of the model that is kept in sync with the labels of the pie's slices.

Note: Getter function for property labelsColumn.

See also setLabelsColumn().

void QVPieModelMapper::setLabelsColumn(int labelsColumn)

Sets the model column that is kept in sync with the pies slices' labels to labelsColumn.

Note: Setter function for property labelsColumn.

See also labelsColumn().

void QVPieModelMapper::setValuesColumn(int valuesColumn)

Sets the model column that is kept in sync with the pie slices' values to valuesColumn.

Note: Setter function for property valuesColumn.

See also valuesColumn().

int QVPieModelMapper::valuesColumn() const

Returns the column of the model that is kept in sync with the values of the pie's slices.

Note: Getter function for property valuesColumn.

See also setValuesColumn().

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