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qthovercursorqwidget

Show a square Cursor

How could I show a square instead of a cursor in QT for eraser in drawing app?

In other words how could I have a square with a side of a specific length instead of a cursor when I am hovering over the QWidget?

Solution

  • You have to create a QPixmap that draws the rectangle creating a QCursor and then set it to the widget you want.

    #include <QApplication>
#include <QGraphicsView>
#include <QHBoxLayout>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QPixmap pixmap(QSize(64, 64));
    pixmap.fill(Qt::transparent);

    QPainter painter(&pixmap);
    QRect r(QPoint(), pixmap.size());
    r.adjust(1, 1, -1, -1);
    painter.drawRect(r);
    painter.end();

    QCursor cursor(pixmap);

    QWidget w;
    QHBoxLayout lay(&w);

    QGraphicsView view1;
    view1.setCursor(cursor);

    QGraphicsView view2;

    lay.addWidget(&view1);
    lay.addWidget(&view2);
    w.show();

    return a.exec();
}