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
Instantiated By: BarDataProxy
Inherits: QAbstractDataProxy
Inherited By:

QItemModelBarDataProxy

Status: Technical Preview

Properties

Public Functions

QBarDataProxy(QObject *parent = nullptr)
virtual ~QBarDataProxy() override
int addRow(QBarDataRow row)
int addRow(QBarDataRow row, QString label)
int addRows(QBarDataArray rows)
int addRows(QBarDataArray rows, QStringList labels)
int colCount() const
void insertRow(int rowIndex, QBarDataRow row)
void insertRow(int rowIndex, QBarDataRow row, QString label)
void insertRows(int rowIndex, QBarDataArray rows)
void insertRows(int rowIndex, QBarDataArray rows, QStringList labels)
const QBarDataItem &itemAt(const QPoint &position) const
const QBarDataItem &itemAt(int rowIndex, int columnIndex) const
void removeRows(int rowIndex, int removeCount, bool removeLabels = true)
void resetArray()
void resetArray(QBarDataArray newArray)
void resetArray(QBarDataArray newArray, QStringList rowLabels, QStringList columnLabels)
const QBarDataRow &rowAt(int rowIndex) const
int rowCount() const
QBar3DSeries *series() const
void setItem(const QPoint &position, QBarDataItem item)
void setItem(int rowIndex, int columnIndex, QBarDataItem item)
void setRow(int rowIndex, QBarDataRow row)
void setRow(int rowIndex, QBarDataRow row, QString label)
void setRows(int rowIndex, QBarDataArray rows)
void setRows(int rowIndex, QBarDataArray rows, QStringList labels)

Signals

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

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 and row manipulation methods provide alternate versions that do not affect the 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.

See also Qt Graphs Data Handling with 3D.

Property Documentation

[read-only] colCount : const int

This property holds the number of columns in the array.

Access functions:

int colCount() const

Notifier signal:

void colCountChanged(int count)

[read-only] rowCount : const int

This property holds the number of rows in the array.

Access functions:

int rowCount() const

Notifier signal:

void rowCountChanged(int 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.

int 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.

int 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.

int 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.

int 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(int 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(int 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(int 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(int 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(const 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(int rowIndex, int 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(int rowIndex, int 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(int rowIndex, int removeCount, bool removeLabels = true)

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(int 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(int startIndex, int 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(int startIndex, int 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(int startIndex, int 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(int startIndex, int 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(const 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(int rowIndex, int columnIndex, QBarDataItem item)

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

void QBarDataProxy::setRow(int 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(int 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(int 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(int 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.

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