PyQT6 make verticalScrollBar() QWheelEvent scroll 1 row instead of 3

Question

I have a QTableView with a verticalScrollBar()

The problem is that when I use the mouse wheel to scroll down/up it moves 3 rows at a time, I'd like to change this to only move 1 row at a time.

Looking at the class reference it seems to implement QWheelEvent,so my best guess is I must overwrite this event...however I have absolutely no idea where to start.

Any help would be much appreciated!

I'm using Python 3.10.5 and Pyqt 6.3 on Arch Linux (Manjaro)

Answer 1

The QApplication class has the setWheelScrollLines method for setting this property globally. But if you only want it to affect one widget, you can create a subclass and utilise it in a reimplemented wheelEvent.

Here's a simple demo:

from PyQt6 import QtGui, QtWidgets

class TableView(QtWidgets.QTableView):
    def __init__(self):
        super().__init__()
        model = QtGui.QStandardItemModel(self)
        for row in range(100):
            model.appendRow(QtGui.QStandardItem())
        self.setModel(model)

    def wheelEvent(self, event):
        lines = QtWidgets.QApplication.wheelScrollLines()
        try:
            QtWidgets.QApplication.setWheelScrollLines(1)
            super().wheelEvent(event)
        finally:
            QtWidgets.QApplication.setWheelScrollLines(lines)
    
app = QtWidgets.QApplication(['Test'])
window = TableView()
window.show()
app.exec()