Update problem when putting data into QStandardModel
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wrote on 29 Jun 2022, 08:15 last edited by
The chart output result is different when you put data sequentially in StandardItemModel and when you put data all at once.
When multiple data are put in at once, the chart is drawn well according to the model data. By the way, if you put them one by one sequentially, the chart is not drawn. I'd like to know if it's an update issue, another issue, or a bug.
TableWidget::TableWidget(QWidget *parent) : QWidget(parent) { // create simple model for storing data // user's table data model //! [1] //m_model = new CustomTableModel; // // //! [1] QStandardItemModel* m_model = new QStandardItemModel(); QStringList categories; categories << "X" << "Y1" << "Y2"; m_model->setHorizontalHeaderLabels(categories); /*categories.clear(); categories << "10" << "20" << "30" << "40" << "50" << "60" << "70" << "80" << "90" << "100"; m_model->setVerticalHeaderLabels(categories);*/ int a = m_model->columnCount(); int b = m_model->rowCount(); nMin = 999999, nMax = -999999; /*QList<QStandardItem*> items; items.append(new QStandardItem(QString::number(10))); items.append(new QStandardItem(QString::number(20))); items.append(new QStandardItem(QString::number(30))); items.append(new QStandardItem(QString::number(40))); items.append(new QStandardItem(QString::number(50))); items.append(new QStandardItem(QString::number(60))); items.append(new QStandardItem(QString::number(70))); items.append(new QStandardItem(QString::number(80))); items.append(new QStandardItem(QString::number(90))); items.append(new QStandardItem(QString::number(100))); m_model->insertColumn(0, items);*/ m_model->setItem(0, 0, new QStandardItem(QString::number(10))); m_model->setItem(1, 0, new QStandardItem(QString::number(20))); m_model->setItem(2, 0, new QStandardItem(QString::number(30))); m_model->setItem(3, 0, new QStandardItem(QString::number(40))); m_model->setItem(4, 0, new QStandardItem(QString::number(50))); m_model->setItem(5, 0, new QStandardItem(QString::number(60))); m_model->setItem(6, 0, new QStandardItem(QString::number(70))); m_model->setItem(7, 0, new QStandardItem(QString::number(80))); m_model->setItem(8, 0, new QStandardItem(QString::number(90))); m_model->setItem(9, 0, new QStandardItem(QString::number(100))); //for (int j = 0; j < 10; j++) //{ // QList<QStandardItem*> items; // /*items.append(new QStandardItem(QString::number((j+1)*10))); // items.append(new QStandardItem(QString::number(QRandomGenerator::global()->bounded(100)))); // items.append(new QStandardItem(QString::number(QRandomGenerator::global()->bounded(100))));*/ // items.append(new QStandardItem(QString::number((j + 1) * 10))); // // int nRan = QRandomGenerator::global()->bounded(100); // items.append(new QStandardItem(QString::number(nRan))); // if (nMin > nRan) // nMin = nRan; // if (nMax < nRan) // nMax = nRan; // // nRan = QRandomGenerator::global()->bounded(100); // items.append(new QStandardItem(QString::number(nRan))); // if (nMin > nRan) // nMin = nRan; // if (nMax < nRan) // nMax = nRan; // m_model->appendRow(items); //} /* for (int n = 0; n < m_model->rowCount(); n++) { for (int k = 0; k < m_model->columnCount(); k++) { } }*/ //! [2] // create table view and add model to it QTableView *tableView = new QTableView; tableView->setModel(m_model); tableView->setMinimumWidth(300); tableView->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch); tableView->verticalHeader()->setSectionResizeMode(QHeaderView::Stretch); m_model->setParent(tableView); //! [2] //! [3] this->chart = new QChart(); this->chart->setAnimationOptions(QChart::AllAnimations); //! [3] // series 1 //! [4] //QBarSeries *series = new QBarSeries; QLineSeries* series = new QLineSeries; int first = 3; int count = 5; //QVBarModelMapper *mapper = new QVBarModelMapper(this); //mapper->setFirstBarSetColumn(1); //mapper->setLastBarSetColumn(4); QVXYModelMapper *mapper = new QVXYModelMapper(this); mapper->setXColumn(0); mapper->setYColumn(1); mapper->setSeries(series); mapper->setModel(m_model); this->chart->addSeries(series); QVXYModelMapper* mapper2 = new QVXYModelMapper(this); QLineSeries* series2 = new QLineSeries; mapper2->setXColumn(0); mapper2->setYColumn(2); mapper2->setSeries(series2); mapper2->setModel(m_model); this->chart->addSeries(series2); /* QVXYModelMapper* mapper = new QHXYModelMapper(this); mapper->setXRow(0); mapper->setYRow(1); mapper->setSeries(series); mapper->setModel(m_model); chart->addSeries(series); QVXYModelMapper* mapper2 = new QHXYModelMapper(this); QLineSeries* series2 = new QLineSeries; mapper2->setXRow(0); mapper2->setYRow(2); mapper2->setSeries(series2); mapper2->setModel(m_model); chart->addSeries(series2);*/ this->chart->createDefaultAxes(); QValueAxis* axisX = new QValueAxis(); axisX->setRange(10, 100); //axisX->setTickCount(9); QValueAxis* axisY = new QValueAxis(); axisY->setRange(nMin, nMax); //axisY->setTickCount(9); this->chart->setAxisX(axisX); this->chart->setAxisY(axisY); /*series->setBrush(QBrush(QColor(255, 0, 0))); mapper = new QVXYModelMapper(this); mapper->setXColumn(2); mapper->setYColumn(3); mapper->setSeries(series); mapper->setModel(m_model); chart->addSeries(series);*/ //! [4] //! [5] // for storing color hex from the series QString seriesColorHex = "#000000"; // get the color of the series and use it for showing the mapped area /* QList<QBarSet *> barsets = series->barSets(); for (int i = 0; i < barsets.count(); i++) { seriesColorHex = "#" + QString::number(barsets.at(i)->brush().color().rgb(), 16).right(6).toUpper(); m_model->addMapping(seriesColorHex, QRect(1 + i, first, 1, barsets.at(i)->count())); }*/ //! [5] /*QBarCategoryAxis *axisX = new QBarCategoryAxis(); axisX->append(categories); chart->addAxis(axisX, Qt::AlignBottom); series->attachAxis(axisX); QValueAxis *axisY = new QValueAxis(); chart->addAxis(axisY, Qt::AlignLeft); series->attachAxis(axisY);*/ //! [6] //! [7] QChartView *chartView = new QChartView(this->chart); chartView->setRenderHint(QPainter::Antialiasing); chartView->setMinimumSize(640, 480); //! [7] //! [8] // create main layout QGridLayout *mainLayout = new QGridLayout; mainLayout->addWidget(tableView, 1, 0); mainLayout->addWidget(chartView, 1, 1); mainLayout->setColumnStretch(1, 1); mainLayout->setColumnStretch(0, 0); setLayout(mainLayout); //! [8] //! //! //QStandardItem *item this->connect(m_model, QOverload<QStandardItem*>::of(&QStandardItemModel::itemChanged), [=](QStandardItem* item) { qDebug() << "*" << item->data().toInt(); }); this->connect(tableView, QOverload<const QModelIndex&>::of(&QAbstractItemView::clicked), [=](const QModelIndex& index) { qDebug() << "**" << index << " | " << m_model->index(index.row(), index.column()).data().toString(); }); this->nRow = 0; this->nCol = 0; m_pTimer = new QTimer(); this->connect(this->m_pTimer, &QTimer::timeout, [=]() { qDebug() << "***" << m_model->columnCount(); qDebug() << "****" << m_model->rowCount(); if (++this->nCol >= m_model->columnCount()) { this->nRow++; this->nCol = 1; } if (nRow >= m_model->rowCount()) { m_pTimer->stop(); QValueAxis* axisx = qobject_cast<QValueAxis*>(this->chart->axes(Qt::Horizontal).first()); axisx->setRange(10, 100); QValueAxis* axisy = qobject_cast<QValueAxis*>(this->chart->axes(Qt::Vertical).first()); axisy->setRange(this->nMin, this->nMax); return; } int nRan = QRandomGenerator::global()->bounded(100); if (this->nMin > nRan) this->nMin = nRan; if (this->nMax < nRan) this->nMax = nRan; m_model->setItem(nRow, nCol, new QStandardItem(QString::number(nRan))); }); m_pTimer->start(500); } -
Can you make it a bit easier for us by providing a minimal, but compilable example?
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wrote on 29 Jun 2022, 23:06 last edited by IknowQT
https://github.com/HaonPAPA/MyRepository/blob/main/barmodelmapper.7z
I've posted an example that I've modified.
If you put data sequentially, it feels like the coordinate system of the chart changes.
I set the range of the Y-axis as 0-100, but it seems to change between 0.5-0.5.
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