- Qt 6.8
- Qt Graphs
- C++ Classes
- QtGraphs
- QBarDataProxy
- Qt Graphs | Commercial or GPLv3

# QBarDataProxy Class

The QBarDataProxy class is the data proxy for a 3D bars graph. More...

Header: | `#include <QBarDataProxy>`
CMake: | `find_package(Qt6 REQUIRED COMPONENTS Graphs)` `target_link_libraries(mytarget PRIVATE Qt6::Graphs)`
qmake: | `QT += graphs`
In QML: | BarDataProxy
Inherits: | QAbstractDataProxy
Inherited By: | QItemModelBarDataProxy

- List of all members, including inherited members
- QBarDataProxy is part of Qt Graphs C++ Classes for 3D.

## Properties

- colCount : const qsizetype
- rowCount : const qsizetype
- series : QBar3DSeries* const

## Public Functions

| QBarDataProxy(QObject *parent = nullptr)
virtual | ~QBarDataProxy() override
qsizetype | addRow(QBarDataRow row)
qsizetype | addRow(QBarDataRow row, QString label)
qsizetype | addRows(QBarDataArray rows)
qsizetype | addRows(QBarDataArray rows, QStringList labels)
qsizetype | colCount() const
void | insertRow(qsizetype rowIndex, QBarDataRow row)
void | insertRow(qsizetype rowIndex, QBarDataRow row, QString label)
void | insertRows(qsizetype rowIndex, QBarDataArray rows)
void | insertRows(qsizetype rowIndex, QBarDataArray rows, QStringList labels)
const QBarDataItem & | itemAt(QPoint position) const
const QBarDataItem & | itemAt(qsizetype rowIndex, qsizetype columnIndex) const
void | removeRows(qsizetype rowIndex, qsizetype removeCount, QBarDataProxy::RemoveLabels removeLabels = RemoveLabels::No)
void | resetArray()
void | resetArray(QBarDataArray newArray)
void | resetArray(QBarDataArray newArray, QStringList rowLabels, QStringList columnLabels)
const QBarDataRow & | rowAt(qsizetype rowIndex) const
qsizetype | rowCount() const
QBar3DSeries * | series() const
void | setItem(QPoint position, QBarDataItem item)
void | setItem(qsizetype rowIndex, qsizetype columnIndex, QBarDataItem item)
void | setRow(qsizetype rowIndex, QBarDataRow row)
void | setRow(qsizetype rowIndex, QBarDataRow row, QString label)
void | setRows(qsizetype rowIndex, QBarDataArray rows)
void | setRows(qsizetype rowIndex, QBarDataArray rows, QStringList labels)

## Signals

void | arrayReset()
void | colCountChanged(qsizetype count)
void | itemChanged(qsizetype rowIndex, qsizetype columnIndex)
void | rowCountChanged(qsizetype count)
void | rowsAdded(qsizetype startIndex, qsizetype count)
void | rowsChanged(qsizetype startIndex, qsizetype count)
void | rowsInserted(qsizetype startIndex, qsizetype count)
void | rowsRemoved(qsizetype startIndex, qsizetype count)
void | seriesChanged(QBar3DSeries *series)

## Related Non-Members

| QBarDataArray
| QBarDataRow

## Detailed Description

A bar data proxy handles adding, inserting, changing, and removing rows of data.

The data array is a list of vectors (rows) of QBarDataItem instances. Each row can contain a different number of items or even be null.

QBarDataProxy takes ownership of all QtGraphs::QBarDataRow objects passed to it, whether directly or in a QtGraphs::QBarDataArray container. If bar data row pointers are used to directly modify data after adding the array to the proxy, the appropriate signal must be emitted to update the graph.

QBarDataProxy optionally keeps track of row and column labels, which QCategory3DAxis can utilize to show axis labels.

The row and column labels are stored in a separate array from the data in the series rather. Row processing methods are available in the proxy and provide alternative versions that do not affect row labels. This enables the option of having row labels that relate to the position of the data in the array rather than the data itself. Since the series holds the data and row and column labels, it is necessary to create a series associated with the proxy before using these functions for them.

See also Qt Graphs Data Handling with 3D.

## Property Documentation

### `[read-only]` colCount : const qsizetype

This property holds the number of columns in the array.

Access functions:

qsizetype | colCount() const

Notifier signal:

void | colCountChanged(qsizetype count)

### `[read-only]` rowCount : const qsizetype

This property holds the number of rows in the array.

Access functions:

qsizetype | rowCount() const

Notifier signal:

void | rowCountChanged(qsizetype count)

### `[read-only]` series : QBar3DSeries* const

This property holds the series this proxy is attached to.

Access functions:

QBar3DSeries * | series() const

Notifier signal:

void | seriesChanged(QBar3DSeries *series)

## Member Function Documentation

### `[explicit]` QBarDataProxy::QBarDataProxy(QObject *parent = nullptr)

Constructs a bar data proxy with the given parent.

### `[override virtual noexcept]` QBarDataProxy::~QBarDataProxy()

Deletes the bar data proxy.

### qsizetype QBarDataProxy::addRow(QBarDataRow row)

Adds the new row row to the end of an array. Existing row labels are not affected.

Returns the index of the added row.

### qsizetype QBarDataProxy::addRow(QBarDataRow row, QString label)

Adds a the new row row with the label label to the end of an array.

Returns the index of the added row.

### qsizetype QBarDataProxy::addRows(QBarDataArray rows)

Adds the new rows to the end of an array. Existing row labels are not affected.

Returns the index of the first added row.

### qsizetype QBarDataProxy::addRows(QBarDataArray rows, QStringList labels)

Adds the new rows with labels to the end of the array.

Returns the index of the first added row.

### `[signal]` void QBarDataProxy::arrayReset()

This signal is emitted when the data array is reset. If the contents of the whole array are changed without calling resetArray(), this signal needs to be emitted to update the graph.

### void QBarDataProxy::insertRow(qsizetype rowIndex, QBarDataRow row)

Inserts the new row row into rowIndex. If rowIndex is equal to the array size, the rows are added to the end of the array. The existing row labels are not affected.

Note: The row labels array will be out of sync with the row array after this call if there were labeled rows beyond the inserted row.

### void QBarDataProxy::insertRow(qsizetype rowIndex, QBarDataRow row, QString label)

Inserts the new row row with the label label into rowIndex. If rowIndex is equal to array size, rows are added to the end of the array.

### void QBarDataProxy::insertRows(qsizetype rowIndex, QBarDataArray rows)

Inserts new rows into rowIndex. If rowIndex is equal to the array size, the rows are added to the end of the array. The existing row labels are not affected.

Note: The row labels array will be out of sync with the row array after this call if there were labeled rows beyond the inserted rows.

### void QBarDataProxy::insertRows(qsizetype rowIndex, QBarDataArray rows, QStringList labels)

Inserts new rows with labels into rowIndex. If rowIndex is equal to the array size, the rows are added to the end of the array.

### const QBarDataItem &QBarDataProxy::itemAt(QPoint position) const

Returns the reference to the item at the position position. The x-value of position indicates the row and the y-value indicates the column. The item is guaranteed to be valid only until the next call that modifies data.

### const QBarDataItem &QBarDataProxy::itemAt(qsizetype rowIndex, qsizetype columnIndex) const

Returns the reference to the item at the position specified by rowIndex and columnIndex. It is guaranteed to be valid only until the next call that modifies data.

### `[signal]` void QBarDataProxy::itemChanged(qsizetype rowIndex, qsizetype columnIndex)

This signal is emitted when the item at the position specified by rowIndex and columnIndex changes. If the item is changed in the array without calling setItem(), this signal needs to be emitted to update the graph.

### void QBarDataProxy::removeRows(qsizetype rowIndex, qsizetype removeCount, QBarDataProxy::RemoveLabels removeLabels = RemoveLabels::No)

Removes the number of rows specified by removeCount starting at the position rowIndex. Attempting to remove rows past the end of the array does nothing. If removeLabels is `true`, the corresponding row labels are also removed. Otherwise, the row labels are not affected.

Note: If removeLabels is `false`, the row labels array will be out of sync with the row array if there are labeled rows beyond the removed rows.

### void QBarDataProxy::resetArray()

Clears the existing array and row and column labels.

### void QBarDataProxy::resetArray(QBarDataArray newArray)

Takes ownership of the array newArray. Clears the existing array if the new array differs from it. If the arrays are the same, this function just triggers the arrayReset() signal.

Passing a null array deletes the old array and creates a new empty array. Row and column labels are not affected.

### void QBarDataProxy::resetArray(QBarDataArray newArray, QStringList rowLabels, QStringList columnLabels)

Takes ownership of the array newArray. Clears the existing array if the new array differs from it. If the arrays are the same, this function just triggers the arrayReset() signal.

Passing a null array deletes the old array and creates a new empty array.

The rowLabels and columnLabels lists specify the new labels for rows and columns.

### const QBarDataRow &QBarDataProxy::rowAt(qsizetype rowIndex) const

Returns the reference to the row at the position rowIndex. It is guaranteed to be valid only until the next call that modifies data.

### `[signal]` void QBarDataProxy::rowsAdded(qsizetype startIndex, qsizetype count)

This signal is emitted when the number of rows specified by count is added, starting at the position startIndex. If rows are added to the array without calling addRow() or addRows(), this signal needs to be emitted to update the graph.

### `[signal]` void QBarDataProxy::rowsChanged(qsizetype startIndex, qsizetype count)

This signal is emitted when the number of rows specified by count is changed, starting at the position startIndex. If rows are changed in the array without calling setRow() or setRows(), this signal needs to be emitted to update the graph.

### `[signal]` void QBarDataProxy::rowsInserted(qsizetype startIndex, qsizetype count)

This signal is emitted when the number of rows specified by count is inserted at the position startIndex.

If rows are inserted into the array without calling insertRow() or insertRows(), this signal needs to be emitted to update the graph.

### `[signal]` void QBarDataProxy::rowsRemoved(qsizetype startIndex, qsizetype count)

This signal is emitted when the number of rows specified by count is removed, starting at the position startIndex.

The index is the current array size if the rows were removed from the end of the array. If rows are removed from the array without calling removeRows(), this signal needs to be emitted to update the graph.

### void QBarDataProxy::setItem(QPoint position, QBarDataItem item)

Changes a single item at the position position to the item item. The x-value of position indicates the row and the y-value indicates the column.

### void QBarDataProxy::setItem(qsizetype rowIndex, qsizetype columnIndex, QBarDataItem item)

Changes a single item at the position specified by rowIndex and columnIndex to the item item.

### void QBarDataProxy::setRow(qsizetype rowIndex, QBarDataRow row)

Changes an existing row by replacing the row at the position rowIndex with the new row specified by row. The new row can be the same as the existing row already stored at rowIndex. Existing row labels are not affected.

### void QBarDataProxy::setRow(qsizetype rowIndex, QBarDataRow row, QString label)

Changes an existing row by replacing the row at the position rowIndex with the new row specified by row. The new row can be the same as the existing row already stored at rowIndex. Changes the row label to label.

### void QBarDataProxy::setRows(qsizetype rowIndex, QBarDataArray rows)

Changes existing rows by replacing the rows starting at the position rowIndex with the new rows specifies by rows. Existing row labels are not affected. The rows in the rows array can be the same as the existing rows already stored at rowIndex.

### void QBarDataProxy::setRows(qsizetype rowIndex, QBarDataArray rows, QStringList labels)

Changes existing rows by replacing the rows starting at the position rowIndex with the new rows specifies by rows. The row labels are changed to labels. The rows in the rows array can be the same as the existing rows already stored at rowIndex.

## Related Non-Members

### `[alias]` QBarDataArray

A list of pointers to QBarDataRow objects.

### `[alias]` QBarDataRow

A list of QBarDataItem objects.