Trying to get scrollerProperties in PySide2 causes crash

Question

I have recently been working on a GUI that will be run on a touch screen in PySide2, and I wanted to implement scrolling by flicking on the touch screen. From what I could tell, the best way to do this would be to use a QScroller. I tried to implement it with this, but I did not like how the scroller would allow horizontal scrolling even though I had disabled the horizontal scroll bar. I saw online that it should be possible to disable this by modifying the scrollerProperties. However, whenever I try to get or set the scroller properties, the entire program immediately crashes. I have the following example, which reproduces my issue:

from PySide2.QtCore import QSize, QPoint, Qt
from PySide2.QtWidgets import QMainWindow, QWidget, QApplication, QLabel, QScrollArea, QScroller


class ScrollerCrash(QMainWindow):

    def __init__(self):
        QMainWindow.__init__(self, None)
        self.setFixedSize(500, 500)
        self._window = QWidget()
        self.setCentralWidget(self._window)
        self.labels = []

        self.panel = QWidget(self)
        self.panel.resize(QSize(500, 10000))
        for i in range(0, 100):
            label = QLabel(self.panel)
            label.setText(f'Label {i}')
            label.resize(QSize(500, 100))
            label.move(QPoint(0, i * 100))
            label.show()
            self.labels.append(label)

        self.scroll_area = QScrollArea(self)
        self.scroll_area.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        self.scroll_area.horizontalScrollBar().setEnabled(False)
        self.scroll_area.resize(QSize(500, 500))
        self.scroll_area.show()
        self.scroll_area.setWidget(self.panel)

        self.scroller = QScroller(self.scroll_area)
        self.scroller.grabGesture(self.scroll_area, QScroller.TouchGesture)
        self.scroller.grabGesture(self.scroll_area, QScroller.LeftMouseButtonGesture)
        print('before getting properties')
        self.props = self.scroller.scrollerProperties()  # Causes a seg fault
        print('after getting properties')


if __name__ == '__main__':
    application = QApplication()
    test = ScrollerCrash()
    test.show()
    application.exec_()

My PySide2 version is 5.15.10.

I can't figure out any way to work around this. Is there something I am missing, or is there a better way to go about what I am doing? Thanks!

Answer 1

Thanks to musicamante, it was as simple as using QScroller.scroller() instead of directly creating a QScroller. I somehow missed that when I was going over the documentation.