how to solve QGraphicsscene memory leak
Unsolved
General and Desktop
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Hi, I have a question for you. Use the official Demo Chip example
Set setItemIndexMethod(QGraphicsScene::NoIndex) in QGraphicsScene; And set shortcuts to add and remove QGraphicsItem, but found that memory kept growing.
Please look at my code:MainWindow::MainWindow(QWidget *parent) : QWidget(parent), scene(new QGraphicsScene(this)) , h1Splitter(new QSplitter(this)), h2Splitter(new QSplitter(this)) { scene->setItemIndexMethod(QGraphicsScene::NoIndex); populateScene(); QSplitter *vSplitter = new QSplitter; vSplitter->setOrientation(Qt::Vertical); vSplitter->addWidget(h1Splitter); vSplitter->addWidget(h2Splitter); View *view = new View("Top left view"); view->view()->setScene(scene); h1Splitter->addWidget(view); view = new View("Top right view"); view->view()->setScene(scene); h1Splitter->addWidget(view); view = new View("Bottom left view"); view->view()->setScene(scene); h2Splitter->addWidget(view); view = new View("Bottom right view"); view->view()->setScene(scene); h2Splitter->addWidget(view); QHBoxLayout *layout = new QHBoxLayout; layout->addWidget(vSplitter); setLayout(layout); setWindowTitle(tr("Chip Example")); } void MainWindow::keyPressEvent(QKeyEvent *event) { if(event->key() == Qt::Key_D && event->modifiers()== Qt::CTRL) { scene->clear(); } if(event->key() == Qt::Key_N && event->modifiers()== Qt::CTRL) { populateScene(); } } void MainWindow::populateScene() { QImage image(":/qt4logo.png"); scene->clear(); qInfo()<<"item size:" << scene->items().size(); // Populate scene int xx = 0; int nitems = 0; for (int i = -11000; i < 11000; i += 110) { ++xx; int yy = 0; for (int j = -7000; j < 5000; j += 70) { ++yy; qreal x = (i + 11000) / 22000.0; qreal y = (j + 7000) / 14000.0; QColor color(image.pixel(int(image.width() * x), int(image.height() * y))); QGraphicsItem *item = new Chip(color, xx, yy); item->setPos(QPointF(i, j)); scene->addItem(item); ++nitems; } } }