Revision control
++ // Copyright (C) 2024 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
++ // Qt-Security score:significant reason:default
++
++ #include <QtCore/QAbstractItemModel>
++ #include <QtGraphs/QXYModelMapper>
++ #include <QtGraphs/QXYSeries>
++ #include "qxymodelmapper_p.h"
++ #include "qxyseries_p.h"
++
++ #include <qtgraphs_tracepoints_p.h>
++
++ QT_BEGIN_NAMESPACE
++
++ Q_LOGGING_CATEGORY(lcModelMapper2D, "qt.graphs2d.modelmapper")
++
++ Q_TRACE_PREFIX(qtgraphs,
++ "QT_BEGIN_NAMESPACE" \
++ "class QXYModelMapper;" \
++ "QT_END_NAMESPACE"
++ )
++
++ Q_TRACE_POINT(qtgraphs, QGraphs2DXYModelMappeInitXYFromModel_entry);
++ Q_TRACE_POINT(qtgraphs, QGraphs2DXYModelMappeInitXYFromModel_exit);
++
++ Q_TRACE_POINT(qtgraphs, QGraphs2DXYModelMappeRemoveData_entry, int start, int end);
++ Q_TRACE_POINT(qtgraphs, QGraphs2DXYModelMappeRemoveData_exit);
++
++ Q_TRACE_POINT(qtgraphs, QGraphs2DXYModelMappeInsertData_entry, int start, int end);
++ Q_TRACE_POINT(qtgraphs, QGraphs2DXYModelMappeInsertData_exit);
++
++ Q_TRACE_POINT(qtgraphs, QGraphs2DXYModelMapperOnModelUpdated_entry);
++ Q_TRACE_POINT(qtgraphs, QGraphs2DXYModelMapperOnModelUpdated_exit);
++
++ /*!
++ \class QXYModelMapper
++ \inmodule QtGraphs
++ \ingroup graphs_2D
++
++ \brief The QXYModelMapper class is a model mapper for line,
++ spline, and scatter series.
++
++ 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 line, spline, or scatter series.
++ A \e TableModel is a natural choice
++ for the model.
++
++ Both model and series properties can be used to manipulate the data. The
++ model mapper keeps the series and the data model in sync.
++
++ \sa QXYSeries
++ */
++ /*!
++ \qmltype XYModelMapper
++ \nativetype QXYModelMapper
++ \inqmlmodule QtGraphs
++ \ingroup graphs_qml_2D
++
++ \brief A model mapper for XYSeries.
++
++ 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 line, spline, or scatter series.
++ A \e TableModel is a natural choice
++ for the model.
++
++ Both model and series properties can be used to manipulate the data. The
++ model mapper keeps the series and the data model in sync.
++
++ \sa XYSeries
++ */
++
++ /*!
++ \property QXYModelMapper::series
++ \brief The 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).
++ */
++ /*!
++ \qmlproperty XYSeries XYModelMapper::series
++ The 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).
++ */
++
++ /*!
++ \property QXYModelMapper::model
++ \brief The model that is used by the mapper.
++ */
++ /*!
++ \qmlproperty SomeModel XYModelMapper::model
++ The data model that is used by the mapper. You need to implement the model
++ and expose it to QML.
++
++ \note The model has to support adding and removing rows or columns and
++ modifying the data in the cells.
++ */
++
++ /*!
++ \property QXYModelMapper::xSection
++ \brief The section of the model that contains the x-coordinates of data
++ points.
++
++ The default value is -1 (invalid mapping).
++
++ \sa QXYModelMapper::orientation
++ */
++ /*!
++ \qmlproperty qsizetype XYModelMapper::xSection
++ the section of the model that contains the x-coordinates of data points.
++ The default value is -1 (invalid mapping).
++
++ \sa orientation
++ */
++
++ /*!
++ \property QXYModelMapper::ySection
++ \brief the section of the model that contains the y-coordinates of data
++ points.
++
++ The default value is -1 (invalid mapping).
++
++ \sa QXYModelMapper::orientation
++ */
++ /*!
++ \qmlproperty qsizetype XYModelMapper::ySection
++ the section of the model that contains the y-coordinates of data points.
++ The default value is -1 (invalid mapping).
++
++ \sa orientation
++ */
++
++ /*!
++ \property QXYModelMapper::first
++ \brief The row of the model that contains the data for the first point
++ of the series.
++
++ The minimum and default value is 0.
++
++ \sa QXYModelMapper::orientation
++ */
++ /*!
++ \qmlproperty qsizetype XYModelMapper::first
++ The row of the model that contains the data for the first point of the series.
++ The default value is 0.
++
++ \sa orientation
++ */
++
++ /*!
++ \property QXYModelMapper::count
++ \brief The number of rows of the model that are mapped as the data for series.
++
++ The minimum and default value is -1 (the number is limited by the number of
++ rows in the model).
++
++ \sa QXYModelMapper::orientation
++ */
++ /*!
++ \qmlproperty qsizetype XYModelMapper::count
++ The number of rows of the model that are mapped as the data for series. The default value is
++ -1 (the number is limited by the number of rows in the model).
++
++ \sa orientation
++ */
++
++ /*!
++ \property QXYModelMapper::orientation
++ \brief Tells the modelmapper how to map data from a model. If
++ \c{Qt::Vertical} is used, each of the model's columns defines a bar set, and the
++ model's rows define the categories. When the orientation is set to
++ \c{Qt::Horizontal}, each of the model's rows defines a bar set, and the model's
++ columns define categories.
++
++ The default value is \c{Qt::Vertical}
++ */
++ /*!
++ \qmlproperty orientation XYModelMapper::orientation
++ Tells the modelmapper how to map data from a model. If
++ \c{Qt.Vertical} is used, the model has \e X and \e Y columns, and the
++ model's rows define the data points. When the orientation is set to
++ \c{Qt.Horizontal}, the model has \e X and \e Y rows, and the model's
++ columns define the data points.
++ */
++
++ /*!
++ \qmlsignal XYModelMapper::seriesChanged()
++
++ This signal is emitted when the series that the mapper is connected to changes.
++ */
++
++ /*!
++ \qmlsignal XYModelMapper::modelChanged()
++
++ This signal is emitted when the model that the mapper is connected to changes.
++ */
++
++ /*!
++ \qmlsignal XYModelMapper::xSectionChanged()
++
++ This signal is emitted when the section that contains the x-coordinates of
++ data points changes.
++ */
++
++ /*!
++ \qmlsignal XYModelMapper::ySectionChanged()
++
++ This signal is emitted when the section that contains the y-coordinates of
++ data points changes.
++ */
++
++ /*!
++ \qmlsignal XYModelMapper::firstChanged()
++ This signal is emitted when the first row changes.
++ */
++
++ /*!
++ \qmlsignal XYModelMapper::countChanged()
++ This signal is emitted when the number of rows changes.
++ */
++
++ /*!
++ \qmlsignal BarModelMapper::orientationChanged()
++ This signal is emitted when the orientation changes.
++ */
++
++ QXYModelMapper::~QXYModelMapper() {}
++
++ QXYModelMapper::QXYModelMapper(QObject *parent)
++ : QObject{*(new QXYModelMapperPrivate), parent}
++ {}
++
++ QXYModelMapper::QXYModelMapper(QXYModelMapperPrivate &dd, QObject *parent)
++ : QObject(dd, parent)
++ {}
++
++ QAbstractItemModel *QXYModelMapper::model() const
++ {
++ Q_D(const QXYModelMapper);
++ return d->m_model;
++ }
++
++ void QXYModelMapper::setModel(QAbstractItemModel *model)
++ {
++ if (model == 0)
++ return;
++
++ Q_D(QXYModelMapper);
++ if (d->m_model == model)
++ return;
++
++ if (d->m_model) {
++ QObjectPrivate::disconnect(d->m_model,
++ &QAbstractItemModel::dataChanged,
++ d,
++ &QXYModelMapperPrivate::onModelUpdated);
++ QObjectPrivate::disconnect(d->m_model,
++ &QAbstractItemModel::rowsInserted,
++ d,
++ &QXYModelMapperPrivate::onModelRowsAdded);
++ QObjectPrivate::disconnect(d->m_model,
++ &QAbstractItemModel::rowsRemoved,
++ d,
++ &QXYModelMapperPrivate::onModelRowsRemoved);
++ QObjectPrivate::disconnect(d->m_model,
++ &QAbstractItemModel::columnsInserted,
++ d,
++ &QXYModelMapperPrivate::onModelColumnsAdded);
++ QObjectPrivate::disconnect(d->m_model,
++ &QAbstractItemModel::columnsRemoved,
++ d,
++ &QXYModelMapperPrivate::onModelColumnsRemoved);
++ QObjectPrivate::disconnect(d->m_model,
++ &QAbstractItemModel::modelReset,
++ d,
++ &QXYModelMapperPrivate::onModelReset);
++ QObjectPrivate::disconnect(d->m_model,
++ &QAbstractItemModel::layoutChanged,
++ d,
++ &QXYModelMapperPrivate::onModelReset);
++ QObjectPrivate::disconnect(d->m_model,
++ &QAbstractItemModel::destroyed,
++ d,
++ &QXYModelMapperPrivate::handleModelDestroyed);
++ }
++
++ d->m_model = model;
++ d->initializeXYFromModel();
++ // connect signals from the model
++ QObjectPrivate::connect(d->m_model,
++ &QAbstractItemModel::dataChanged,
++ d,
++ &QXYModelMapperPrivate::onModelUpdated);
++ QObjectPrivate::connect(d->m_model,
++ &QAbstractItemModel::rowsInserted,
++ d,
++ &QXYModelMapperPrivate::onModelRowsAdded);
++ QObjectPrivate::connect(d->m_model,
++ &QAbstractItemModel::rowsRemoved,
++ d,
++ &QXYModelMapperPrivate::onModelRowsRemoved);
++ QObjectPrivate::connect(d->m_model,
++ &QAbstractItemModel::columnsInserted,
++ d,
++ &QXYModelMapperPrivate::onModelColumnsAdded);
++ QObjectPrivate::connect(d->m_model,
++ &QAbstractItemModel::columnsRemoved,
++ d,
++ &QXYModelMapperPrivate::onModelColumnsRemoved);
++
++ QObjectPrivate::connect(d->m_model,
++ &QAbstractItemModel::modelReset,
++ d,
++ &QXYModelMapperPrivate::onModelReset);
++ QObjectPrivate::connect(d->m_model,
++ &QAbstractItemModel::layoutChanged,
++ d,
++ &QXYModelMapperPrivate::onModelReset);
++ QObjectPrivate::connect(d->m_model,
++ &QAbstractItemModel::destroyed,
++ d,
++ &QXYModelMapperPrivate::handleModelDestroyed);
++ Q_EMIT modelChanged();
++ }
++
++ QXYSeries *QXYModelMapper::series() const
++ {
++ Q_D(const QXYModelMapper);
++ return d->m_series;
++ }
++
++ void QXYModelMapper::setSeries(QXYSeries *series)
++ {
++ Q_D(QXYModelMapper);
++ if (series && d->m_series == series)
++ return;
++
++ if (d->m_series) {
++ QObjectPrivate::disconnect(d->m_series,
++ &QXYSeries::pointAdded,
++ d,
++ &QXYModelMapperPrivate::onPointAdded);
++ QObjectPrivate::disconnect(d->m_series,
++ &QXYSeries::pointRemoved,
++ d,
++ &QXYModelMapperPrivate::onPointRemoved);
++ QObjectPrivate::disconnect(d->m_series,
++ &QXYSeries::pointReplaced,
++ d,
++ &QXYModelMapperPrivate::onPointReplaced);
++ QObjectPrivate::disconnect(d->m_series,
++ &QXYSeries::destroyed,
++ d,
++ &QXYModelMapperPrivate::handleSeriesDestroyed);
++ QObjectPrivate::disconnect(d->m_series,
++ &QXYSeries::pointsRemoved,
++ d,
++ &QXYModelMapperPrivate::onPointsRemoved);
++ }
++
++ if (series == 0)
++ return;
++
++ d->m_series = series;
++ d->initializeXYFromModel();
++ // connect the signals from the series
++ QObjectPrivate::connect(d->m_series,
++ &QXYSeries::pointAdded,
++ d,
++ &QXYModelMapperPrivate::onPointAdded);
++ QObjectPrivate::connect(d->m_series,
++ &QXYSeries::pointRemoved,
++ d,
++ &QXYModelMapperPrivate::onPointRemoved);
++ QObjectPrivate::connect(d->m_series,
++ &QXYSeries::pointReplaced,
++ d,
++ &QXYModelMapperPrivate::onPointReplaced);
++ QObjectPrivate::connect(d->m_series,
++ &QXYSeries::destroyed,
++ d,
++ &QXYModelMapperPrivate::handleSeriesDestroyed);
++ QObjectPrivate::connect(d->m_series,
++ &QXYSeries::pointsRemoved,
++ d,
++ &QXYModelMapperPrivate::onPointsRemoved);
++ Q_EMIT seriesChanged();
++ }
++
++ qsizetype QXYModelMapper::first() const
++ {
++ Q_D(const QXYModelMapper);
++ return d->m_first;
++ }
++
++ void QXYModelMapper::setFirst(qsizetype first)
++ {
++ Q_D(QXYModelMapper);
++ first = qMax(first, 0);
++ if (d->m_first == first)
++ return;
++ d->m_first = first;
++ d->initializeXYFromModel();
++ Q_EMIT firstChanged();
++ }
++
++ qsizetype QXYModelMapper::count() const
++ {
++ Q_D(const QXYModelMapper);
++ return d->m_count;
++ }
++
++ void QXYModelMapper::setCount(qsizetype count)
++ {
++ Q_D(QXYModelMapper);
++ count = qMax(count, -1);
++ if (d->m_count == count)
++ return;
++ d->m_count = count;
++ d->initializeXYFromModel();
++ Q_EMIT countChanged();
++ }
++
++ Qt::Orientation QXYModelMapper::orientation() const
++ {
++ Q_D(const QXYModelMapper);
++ return d->m_orientation;
++ }
++
++ void QXYModelMapper::setOrientation(Qt::Orientation orientation)
++ {
++ Q_D(QXYModelMapper);
++ if (d->m_orientation == orientation)
++ return;
++ d->m_orientation = orientation;
++ d->initializeXYFromModel();
++ Q_EMIT orientationChanged();
++ }
++
++ qsizetype QXYModelMapper::xSection() const
++ {
++ Q_D(const QXYModelMapper);
++ return d->m_xSection;
++ }
++
++ void QXYModelMapper::setXSection(qsizetype xSection)
++ {
++ Q_D(QXYModelMapper);
++ xSection = qMax(-1, xSection);
++ if (d->m_xSection == xSection)
++ return;
++ d->m_xSection = xSection;
++ d->initializeXYFromModel();
++ Q_EMIT xSectionChanged();
++ }
++
++ qsizetype QXYModelMapper::ySection() const
++ {
++ Q_D(const QXYModelMapper);
++ return d->m_ySection;
++ }
++
++ void QXYModelMapper::setYSection(qsizetype ySection)
++ {
++ Q_D(QXYModelMapper);
++ ySection = qMax(-1, ySection);
++ if (d->m_ySection == ySection)
++ return;
++ d->m_ySection = ySection;
++ d->initializeXYFromModel();
++ Q_EMIT ySectionChanged();
++ }
++
++ ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
++
++ QXYModelMapperPrivate::QXYModelMapperPrivate() {}
++
++ QXYModelMapperPrivate::~QXYModelMapperPrivate() {}
++
++ void QXYModelMapperPrivate::blockModelSignals(bool block)
++ {
++ m_modelSignalsBlock = block;
++ }
++
++ void QXYModelMapperPrivate::blockSeriesSignals(bool block)
++ {
++ m_seriesSignalsBlock = block;
++ }
++
++ QModelIndex QXYModelMapperPrivate::xModelIndex(qsizetype xIndex)
++ {
++ if (m_count != -1 && xIndex >= m_count)
++ return QModelIndex(); // invalid
++ if (m_orientation == Qt::Vertical)
++ return m_model->index(int(xIndex) + m_first, m_xSection);
++ else
++ return m_model->index(m_xSection, int(xIndex) + m_first);
++ }
++
++ QModelIndex QXYModelMapperPrivate::yModelIndex(qsizetype yIndex)
++ {
++ if (m_count != -1 && yIndex >= m_count)
++ return QModelIndex(); // invalid
++ if (m_orientation == Qt::Vertical)
++ return m_model->index(int(yIndex) + m_first, m_ySection);
++ else
++ return m_model->index(m_ySection, int(yIndex) + m_first);
++ }
++
++ qreal QXYModelMapperPrivate::valueFromModel(QModelIndex index)
++ {
++ QVariant value = m_model->data(index, Qt::DisplayRole);
++ switch (value.metaType().id()) {
++ case QMetaType::QDateTime:
++ return value.toDateTime().toMSecsSinceEpoch();
++ case QMetaType::QDate:
++ return value.toDate().startOfDay().toMSecsSinceEpoch();
++ default:
++ return value.toReal();
++ }
++ }
++
++ void QXYModelMapperPrivate::setValueToModel(QModelIndex index, qreal value)
++ {
++ QVariant oldValue = m_model->data(index, Qt::DisplayRole);
++ switch (oldValue.metaType().id()) {
++ case QMetaType::QDateTime:
++ m_model->setData(index, QDateTime::fromMSecsSinceEpoch(value));
++ break;
++ case QMetaType::QDate:
++ m_model->setData(index, QDateTime::fromMSecsSinceEpoch(value).date());
++ break;
++ default:
++ m_model->setData(index, value);
++ }
++ }
++
++ void QXYModelMapperPrivate::onPointAdded(qsizetype pointIndex)
++ {
++ if (m_seriesSignalsBlock)
++ return;
++
++ if (m_count != -1)
++ m_count += 1;
++
++ blockModelSignals();
++ if (m_orientation == Qt::Vertical)
++ m_model->insertRows(int(pointIndex) + m_first, 1);
++ else
++ m_model->insertColumns(int(pointIndex) + m_first, 1);
++
++ setValueToModel(xModelIndex(pointIndex), m_series->points().at(pointIndex).x());
++ setValueToModel(yModelIndex(pointIndex), m_series->points().at(pointIndex).y());
++ blockModelSignals(false);
++ }
++
++ void QXYModelMapperPrivate::onPointRemoved(qsizetype pointIndex)
++ {
++ if (m_seriesSignalsBlock)
++ return;
++
++ if (m_count != -1)
++ m_count -= 1;
++
++ blockModelSignals();
++ if (m_orientation == Qt::Vertical)
++ m_model->removeRow(int(pointIndex) + m_first);
++ else
++ m_model->removeColumn(int(pointIndex) + m_first);
++ blockModelSignals(false);
++ }
++
++ void QXYModelMapperPrivate::onPointsRemoved(qsizetype pointIndex, qsizetype count)
++ {
++ if (m_seriesSignalsBlock)
++ return;
++
++ m_count -= count;
++
++ if (m_count < -1)
++ m_count = -1;
++
++ blockModelSignals();
++ if (m_orientation == Qt::Vertical)
++ m_model->removeRows(int(pointIndex) + m_first, int(count));
++ else
++ m_model->removeColumns(int(pointIndex) + m_first, int(count));
++ blockModelSignals(false);
++ }
++
++ void QXYModelMapperPrivate::onPointReplaced(qsizetype pointIndex)
++ {
++ if (m_seriesSignalsBlock)
++ return;
++
++ blockModelSignals();
++ setValueToModel(xModelIndex(pointIndex), m_series->points().at(pointIndex).x());
++ setValueToModel(yModelIndex(pointIndex), m_series->points().at(pointIndex).y());
++ blockModelSignals(false);
++ }
++
++ void QXYModelMapperPrivate::handleSeriesDestroyed()
++ {
++ m_series = 0;
++ }
++
++ void QXYModelMapperPrivate::onModelUpdated(QModelIndex topLeft, QModelIndex bottomRight)
++ {
++ if (m_model == 0 || m_series == 0)
++ return;
++
++ if (m_modelSignalsBlock)
++ return;
++
++ Q_TRACE_SCOPE(QGraphs2DXYModelMapperOnModelUpdated);
++ blockSeriesSignals();
++ QModelIndex index;
++ QPointF newPoint;
++ int indexColumn = 0;
++ int indexRow = 0;
++ for (int row = topLeft.row(); row <= bottomRight.row(); row++) {
++ for (int column = topLeft.column(); column <= bottomRight.column(); column++) {
++ index = topLeft.sibling(row, column);
++ indexColumn = index.column();
++ indexRow = index.row();
++ if (m_orientation == Qt::Vertical
++ && (indexColumn == m_xSection || indexColumn == m_ySection)) {
++ if (indexRow >= m_first && (m_count == -1 || indexRow < m_first + m_count)) {
++ QModelIndex xIndex = xModelIndex(indexRow - m_first);
++ QModelIndex yIndex = yModelIndex(indexRow - m_first);
++ if (xIndex.isValid() && yIndex.isValid()) {
++ newPoint.setX(valueFromModel(xIndex));
++ newPoint.setY(valueFromModel(yIndex));
++ m_series->replace(indexRow - m_first, newPoint);
++ }
++ }
++ } else if (m_orientation == Qt::Horizontal
++ && (indexRow == m_xSection || indexRow == m_ySection)) {
++ if (indexColumn >= m_first && (m_count == -1 || indexColumn < m_first + m_count)) {
++ QModelIndex xIndex = xModelIndex(indexColumn - m_first);
++ QModelIndex yIndex = yModelIndex(indexColumn - m_first);
++ if (xIndex.isValid() && yIndex.isValid()) {
++ newPoint.setX(valueFromModel(xIndex));
++ newPoint.setY(valueFromModel(yIndex));
++ m_series->replace(indexColumn - m_first, newPoint);
++ }
++ }
++ }
++ }
++ }
++ blockSeriesSignals(false);
++ }
++
++ void QXYModelMapperPrivate::onModelRowsAdded(QModelIndex parent, qsizetype start, qsizetype end)
++ {
++ Q_UNUSED(parent);
++ if (m_modelSignalsBlock)
++ return;
++
++ blockSeriesSignals();
++ if (m_orientation == Qt::Vertical) {
++ insertData(start, end);
++ } else if (start <= m_xSection || start <= m_ySection) {
++ // if the changes affect the map - reinitialize the xy
++ initializeXYFromModel();
++ }
++ blockSeriesSignals(false);
++ }
++
++ void QXYModelMapperPrivate::onModelRowsRemoved(QModelIndex parent, qsizetype start, qsizetype end)
++ {
++ Q_UNUSED(parent);
++ if (m_modelSignalsBlock)
++ return;
++
++ blockSeriesSignals();
++ if (m_orientation == Qt::Vertical) {
++ removeData(start, end);
++ } else if (start <= m_xSection || start <= m_ySection) {
++ // if the changes affect the map - reinitialize the xy
++ initializeXYFromModel();
++ }
++ blockSeriesSignals(false);
++ }
++
++ void QXYModelMapperPrivate::onModelColumnsAdded(QModelIndex parent, qsizetype start, qsizetype end)
++ {
++ Q_UNUSED(parent);
++ if (m_modelSignalsBlock)
++ return;
++
++ blockSeriesSignals();
++ if (m_orientation == Qt::Horizontal) {
++ insertData(start, end);
++ } else if (start <= m_xSection || start <= m_ySection) {
++ // if the changes affect the map - reinitialize the xy
++ initializeXYFromModel();
++ }
++ blockSeriesSignals(false);
++ }
++
++ void QXYModelMapperPrivate::onModelColumnsRemoved(QModelIndex parent, qsizetype start, qsizetype end)
++ {
++ Q_UNUSED(parent);
++ if (m_modelSignalsBlock)
++ return;
++
++ blockSeriesSignals();
++ if (m_orientation == Qt::Horizontal) {
++ removeData(start, end);
++ } else if (start <= m_xSection || start <= m_ySection) {
++ // if the changes affect the map - reinitialize the xy
++ initializeXYFromModel();
++ }
++ blockSeriesSignals(false);
++ }
++
++ void QXYModelMapperPrivate::onModelReset()
++ {
++ // Models may emit modelReset/layoutChanged from insertRows()/removeRows() while we are
++ // writing a series change back to them. The series already holds the change.
++ if (m_modelSignalsBlock)
++ return;
++
++ initializeXYFromModel();
++ }
++
++ void QXYModelMapperPrivate::handleModelDestroyed()
++ {
++ m_model = 0;
++ }
++
++ void QXYModelMapperPrivate::insertData(int start, int end)
++ {
++ if (m_model == 0 || m_series == 0)
++ return;
++
++ if (m_count != -1 && start >= m_first + m_count) {
++ return;
++ } else {
++ Q_TRACE_SCOPE(QGraphs2DXYModelMappeInsertData, start, end);
++ int addedCount = end - start + 1;
++ if (m_count != -1 && addedCount > m_count)
++ addedCount = m_count;
++ int first = qMax(start, m_first);
++ int last = qMin(first + addedCount - 1,
++ m_orientation == Qt::Vertical ? m_model->rowCount() - 1
++ : m_model->columnCount() - 1);
++ for (int i = first; i <= last; i++) {
++ QPointF point;
++ QModelIndex xIndex = xModelIndex(i - m_first);
++ QModelIndex yIndex = yModelIndex(i - m_first);
++ if (xIndex.isValid() && yIndex.isValid()) {
++ point.setX(valueFromModel(xIndex));
++ point.setY(valueFromModel(yIndex));
++ m_series->insert(i - m_first, point);
++ }
++ }
++
++ // remove excess of points (above m_count)
++ if (m_count != -1 && m_series->points().size() > m_count) {
++ for (qsizetype i = m_series->points().size() - 1; i >= m_count; i--)
++ m_series->remove(m_series->points().at(i));
++ }
++ }
++ }
++
++ void QXYModelMapperPrivate::removeData(int start, int end)
++ {
++ if (m_model == 0 || m_series == 0)
++ return;
++
++ int removedCount = end - start + 1;
++ if (m_count != -1 && start >= m_first + m_count) {
++ return;
++ } else {
++ Q_TRACE_SCOPE(QGraphs2DXYModelMappeRemoveData, start, end);
++ int toRemove = qMin(int(m_series->count()),
++ removedCount); // first find how many items can actually be removed
++ int first = qMax(start, m_first); // get the index of the first item that will be removed.
++ int last = qMin(first + toRemove - 1,
++ int(m_series->count()) + m_first
++ - 1); // get the index of the last item that will be removed.
++ for (int i = last; i >= first; i--)
++ m_series->remove(m_series->points().at(i - m_first));
++
++ if (m_count != -1) {
++ qsizetype itemsAvailable; // check how many are available to be added
++ if (m_orientation == Qt::Vertical)
++ itemsAvailable = m_model->rowCount() - m_first - m_series->count();
++ else
++ itemsAvailable = m_model->columnCount() - m_first - m_series->count();
++ int toBeAdded = qMin(
++ int(itemsAvailable),
++ m_count
++ - int(m_series->count())); // add not more items than there is space left to be filled.
++ qsizetype currentSize = m_series->count();
++ if (toBeAdded > 0) {
++ for (qsizetype i = m_series->count(); i < currentSize + toBeAdded; i++) {
++ QPointF point;
++ QModelIndex xIndex = xModelIndex(i);
++ QModelIndex yIndex = yModelIndex(i);
++ if (xIndex.isValid() && yIndex.isValid()) {
++ point.setX(valueFromModel(xIndex));
++ point.setY(valueFromModel(yIndex));
++ m_series->insert(i, point);
++ }
++ }
++ }
++ }
++ }
++ }
++
++ void QXYModelMapperPrivate::initializeXYFromModel()
++ {
++ if (m_model == 0 || m_series == 0)
++ return;
++
++ Q_TRACE_SCOPE(QGraphs2DXYModelMappeInitXYFromModel);
++
++ // create the initial points set
++ QList<QPointF> points;
++ int pointPos = 0;
++ QModelIndex xIndex = xModelIndex(pointPos);
++ QModelIndex yIndex = yModelIndex(pointPos);
++ if (xIndex.isValid() && yIndex.isValid()) {
++ const int available = m_orientation == Qt::Vertical ? m_model->rowCount()
++ : m_model->columnCount();
++ points.reserve(qMax(0, available - int(m_first)));
++
++ while (xIndex.isValid() && yIndex.isValid()) {
++ QPointF point;
++ point.setX(valueFromModel(xIndex));
++ point.setY(valueFromModel(yIndex));
++ points.append(point);
++ pointPos++;
++ xIndex = xModelIndex(pointPos);
++ yIndex = yModelIndex(pointPos);
++ // Don't warn about invalid index after the first, those are valid and used to
++ // determine when we should end looping.
++ }
++ } else {
++ // Invalid index right off the bat means series will be left empty, so output a warning,
++ // unless model is also empty
++ int count = m_orientation == Qt::Vertical ? m_model->rowCount() : m_model->columnCount();
++ if (count > 0) {
++ if (!xIndex.isValid()) {
++ qCWarning(lcModelMapper2D, "%ls Invalid X coordinate index in model mapper.",
++ qUtf16Printable(QString::fromUtf8(__func__)));
++ } else if (!yIndex.isValid()) {
++ qCWarning(lcModelMapper2D, "%ls Invalid Y coordinate index in model mapper.",
++ qUtf16Printable(QString::fromUtf8(__func__)));
++ }
++ }
++ }
++
++ // Nothing to do if the series already matches the model; avoids needless signals and
++ // renderer updates.
++ if (m_series->points() == points)
++ return;
++
++ blockSeriesSignals();
++ m_series->clear();
++ if (!points.isEmpty())
++ QXYSeriesPrivate::get(m_series)->append(points);
++ blockSeriesSignals(false);
++ }
++
++ QT_END_NAMESPACE
++
++ #include "moc_qxymodelmapper.cpp"