QPieModelMapper Class

The QPieModelMapper is a model mapper for pie series. More...

Header: #include <QPieModelMapper>
CMake: find_package(Qt6 REQUIRED COMPONENTS Graphs)
target_link_libraries(mytarget PRIVATE Qt6::Graphs)
qmake: QT += graphs
In QML: PieModelMapper
Inherits: QObject

Properties

Public Functions

int count() const
int first() const
int labelsSection() const
QAbstractItemModel *model() const
Qt::Orientation orientation() const
QPieSeries *series() const
void setCount(int count)
void setFirst(int first)
void setLabelsSection(int labelsSection)
void setModel(QAbstractItemModel *model)
void setOrientation(Qt::Orientation orientation)
void setSeries(QPieSeries *series)
void setValuesSection(int valuesSection)
int valuesSection() const

Signals

Detailed Description

Model mappers enable using a data model derived from the QAbstractItemModel class as a data source for a graph. A model mapper is used to create a connection between a data model and QPieSeries.

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

count : int

This property holds the number of columns or 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 count() const
void setCount(int count)

Notifier signal:

void countChanged()

See also QPieModelMapper::orientation.

first : int

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

The minimum and default value is 0.

Access functions:

int first() const
void setFirst(int first)

Notifier signal:

void firstChanged()

See also QPieModelMapper::orientation.

labelsSection : int

This property holds the column or row 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 labelsSection() const
void setLabelsSection(int labelsSection)

Notifier signal:

void labelsSectionChanged()

See also QPieModelMapper::orientation.

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 modelChanged()

orientation : Qt::Orientation

Tells the modelmapper how to map data from a model. If Qt::Vertical is used, each of the model's rows defines a pie slice, and the model's columns define the label or the value of the pie slice. When the orientation is set to Qt::Horizontal, each of the model's columns defines a pie slice, and the model's rows define the label or the value of the pie slice.

The default value is Qt::Vertical

Access functions:

Qt::Orientation orientation() const
void setOrientation(Qt::Orientation orientation)

Notifier signal:

void orientationChanged()

series : 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 seriesChanged()

valuesSection : int

This property holds the column or row 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 valuesSection() const
void setValuesSection(int valuesSection)

Notifier signal:

void valuesSectionChanged()

See also QPieModelMapper::orientation.

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