Qt 5.8 | Qt Charts | C++ Classes | QHXYModelMapper

Qt 5.8.0 Reference Documentation

# QHXYModelMapper Class

Horizontal model mapper for QXYSeries. More...

Header: | #include <QHXYModelMapper>
Instantiated By: | HXYModelMapper
Inherits: | QXYModelMapper

- List of all members, including inherited members

## Properties

- columnCount : int
- firstColumn : int
- model : QAbstractItemModel *

- series : QXYSeries *
- xRow : int
- yRow : int

## Public Functions

| QHXYModelMapper(QObject *parent = Q_NULLPTR)
int | columnCount() const
int | firstColumn() const
QAbstractItemModel * | model() const
QXYSeries * | series() const
void | setColumnCount(int columnCount)
void | setFirstColumn(int firstColumn)
void | setModel(QAbstractItemModel *model)
void | setSeries(QXYSeries *series)
void | setXRow(int xRow)
void | setYRow(int yRow)
int | xRow() const
int | yRow() const

## Signals

void | columnCountChanged()
void | firstColumnChanged()
void | modelReplaced()
void | seriesReplaced()
void | xRowChanged()
void | yRowChanged()

### Additional Inherited Members

- 6 protected functions inherited from QXYModelMapper

## Detailed Description

Horizontal model mapper for QXYSeries.

Model mappers allow you to use QAbstractItemModel derived models as a data source for a chart series. Horizontal model mapper is used to create a connection between QXYSeries and QAbstractItemModel derived model object. It is possible to use both QAbstractItemModel and QXYSeries model API. QXYModelMapper makes sure that QXYSeries and the model are kept in sync. Note: used model has to support adding/removing rows/columns and modifying the data of the cells.

## Property Documentation

### columnCount : int

This property defines the number of columns of the model that are mapped as the data for series.

Minimal and default value is: -1 (count limited by the number of columns in the model)

Access functions:

int | columnCount() const
void | setColumnCount(int columnCount)

Notifier signal:

void | columnCountChanged()

### firstColumn : int

This property defines which column of the model contains the data for the first point of the series.

Minimal and default value is: 0

Access functions:

int | firstColumn() const
void | setFirstColumn(int firstColumn)

Notifier signal:

void | firstColumnChanged()

### model : QAbstractItemModel *

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

Access functions:

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

Notifier signal:

void | modelReplaced()

### series : QXYSeries *

This property defines the QXYSeries object that is used by the mapper.

All the data in the series is discarded when it is set to the mapper. When new series is specified the old series is disconnected (it preserves its data)

Access functions:

QXYSeries * | series() const
void | setSeries(QXYSeries *series)

Notifier signal:

void | seriesReplaced()

### xRow : int

This property defines which row of the model is kept in sync with the x values of the QXYSeries.

Default value is: -1 (invalid mapping)

Access functions:

int | xRow() const
void | setXRow(int xRow)

Notifier signal:

void | xRowChanged()

### yRow : int

This property defines which row of the model is kept in sync with the y values of the QXYSeries.

Default value is: -1 (invalid mapping)

Access functions:

int | yRow() const
void | setYRow(int yRow)

Notifier signal:

void | yRowChanged()

## Member Function Documentation

### QHXYModelMapper::QHXYModelMapper(QObject *parent = Q_NULLPTR)

Constructs a mapper object which is a child of parent.

### `[signal]` void QHXYModelMapper::columnCountChanged()

Emitted when the columnCount has changed.

Note: Notifier signal for property columnCount.

### `[signal]` void QHXYModelMapper::firstColumnChanged()

Emitted when the firstColumn has changed.

Note: Notifier signal for property firstColumn.

### `[signal]` void QHXYModelMapper::modelReplaced()

Emitted when the model to which mapper is connected to has changed.

Note: Notifier signal for property model.

### `[signal]` void QHXYModelMapper::seriesReplaced()

Emitted when the series to which mapper is connected to has changed.

Note: Notifier signal for property series.

### `[signal]` void QHXYModelMapper::xRowChanged()

Emitted when the xRow has changed.

Note: Notifier signal for property xRow.

### `[signal]` void QHXYModelMapper::yRowChanged()

Emitted when the yRow has changed.

Note: Notifier signal for property yRow.