Qt-users:770 Sample code for tiling images

image_tile.cpp

#include <QtWidgets/QApplication>
#include <QtWidgets/QGraphicsScene>
#include <QtWidgets/QGraphicsView>
#include <QtGui/QPixmap>
#include <QtWidgets/QGraphicsPixmapItem>
#include <QtCore/QDebug>

namespace {
static constexpr int FilePathKey = 1;
void func1();
}

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);
    func1();
    return app.exec();
}

namespace {
void func1() {
    auto view = new QGraphicsView{};
    auto scene = new QGraphicsScene{qApp};
    for (int i = 0; i < 10; ++i) {
        for (int j = 0; j < 10; ++j) {
            auto pixMap = QPixmap(64, 64);
            auto filePath = QString("image/%1_%2.png").arg(i).arg(j);
            pixMap.load(filePath);
            auto item = scene->addPixmap(pixMap);
            item->setFlag(QGraphicsItem::ItemIsFocusable);
            item->setOffset(70 * i, 70 * j);
            item->setData(FilePathKey, filePath);
        }
    }
    view->setScene(scene);
    QObject::connect(scene, &QGraphicsScene::focusItemChanged,
                     qApp, [](QGraphicsItem *newItem, QGraphicsItem *oldItem, Qt::FocusReason reason){
        qDebug() << (newItem ? newItem->data(FilePathKey).toString() : QString{})
                 << (oldItem ? oldItem->data(FilePathKey).toString() : QString{})
                 << reason;
    });
    view->show();
}
}

image_tile.pro

QT += widgets

SOURCES += \
    image_tile.cpp

images.files += image/*
images.path = $$shadowed(image)

INSTALLS += images

I tested on Qt5.12 and Windows 10.