How to make the widget to take the whole window with using scene() -> addWidget

Aminsl

I'm currently working with two sample project in qt : zoomline chart and callouts . I've combined these two projects and instead of using scene() -> addItem(m_chart) , I used scene() -> addWidget(chartView) in order to use the whole chartview and it's gesture handlers. But I got this:

I don't know really what to do , when I use addItem() It all works well but I need to use chartView so I need the addWidget() method.

Here is my View.cpp code , if it helps :

#include "view.h"
#include <QtGui/QResizeEvent>
#include <QtWidgets/QGraphicsScene>
#include <QtCharts/QChart>
#include <QtCharts/QLineSeries>
#include <QtCharts/QSplineSeries>
#include <QtWidgets/QGraphicsTextItem>
#include "callout.h"
#include "chart.h"
#include "chartview.h"
#include <QtGui/QMouseEvent>
#include <QtCore/QtMath>
#include <QtCore/QRandomGenerator>

View::View(QWidget *parent)
    : QGraphicsView(new QGraphicsScene, parent),
    m_coordX(0),
    m_coordY(0),
    m_chart(0),
    m_tooltip(0)
{
    setDragMode(QGraphicsView::NoDrag);
    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

    //QLineSeries scope code
    QLineSeries *series = new QLineSeries();
    for (int i = 0; i < 500; i++) {
        QPointF p((qreal) i, qSin(M_PI / 50 * i) * 100);
        p.ry() += QRandomGenerator::global()->bounded(20);
        *series << p;
    }

    m_chart = new Chart();
    m_chart->addSeries(series);
    m_chart->setTitle("Zoom in/out example");
    m_chart->setAnimationOptions(QChart::SeriesAnimations);
    m_chart->legend()->hide();
    m_chart->createDefaultAxes();

    ChartView *chartView = new ChartView(m_chart);
    chartView->setRenderHint(QPainter::Antialiasing);

    scene() -> addWidget(chartView);

    m_coordX = new QGraphicsSimpleTextItem(m_chart);
    m_coordX->setPos(m_chart->size().width()/2 - 50, m_chart->size().height());
    m_coordX->setText("X: ");
    m_coordY = new QGraphicsSimpleTextItem(m_chart);
    m_coordY->setPos(m_chart->size().width()/2 + 50, m_chart->size().height());
    m_coordY->setText("Y: ");

    connect(series, &QLineSeries::clicked, this, &View::keepCallout);
    connect(series, &QLineSeries::hovered, this, &View::tooltip);

    this->setMouseTracking(true);
}

void View::resizeEvent(QResizeEvent *event)
{
    if (scene()) {
        scene()->setSceneRect(QRect(QPoint(0, 0), event->size()));
        m_chart->resize(event->size());
        m_coordX->setPos(m_chart->size().width()/2 - 50, m_chart->size().height() - 20);
        m_coordY->setPos(m_chart->size().width()/2 + 50, m_chart->size().height() - 20);
        const auto callouts = m_callouts;
        for (Callout *callout : callouts)
            callout->updateGeometry();
    }
    QGraphicsView::resizeEvent(event);
}

void View::mouseMoveEvent(QMouseEvent *event)
{
    m_coordX->setText(QString("X: %1").arg(m_chart->mapToValue(event->pos()).x()));
    m_coordY->setText(QString("Y: %1").arg(m_chart->mapToValue(event->pos()).y()));
    QGraphicsView::mouseMoveEvent(event);
}

void View::keepCallout()
{
    m_callouts.append(m_tooltip);
    m_tooltip = new Callout(m_chart);
}

void View::tooltip(QPointF point, bool state)
{
    if (m_tooltip == 0)
        m_tooltip = new Callout(m_chart);

    if (state) {
        m_tooltip->setText(QString("X: %1 \nY: %2 ").arg(point.x()).arg(point.y()));
        m_tooltip->setAnchor(point);
        m_tooltip->setZValue(11);
        m_tooltip->updateGeometry();
        m_tooltip->show();
    } else {
        m_tooltip->hide();
    }
}

SGaist

Hi,

Based on a quick look at the QChartView documentation, you should directly set your QChart object on the scene and not use QChartView.

Aminsl

@SGaist well , I did it but I need to set the ChartView on the scene in order to have my gesture handlers. Is there any way to set the ChartView on the scene ?

SGaist

Then why don't you resize the widget item created to fit the view ?