Simple Kinetic Scroll Example Using PyQt (Only Works On Qt5)

qt_kinetic_scroll.py

import sys

from PyQt5.QtWidgets import (
    QApplication,
    QFormLayout,
    QGridLayout,
    QLabel,
    QScrollArea,
    QScroller,
    QWidget,
)


class MainWindow(QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)
        scroll_area = QScrollArea()
        layout = QGridLayout(self)
        layout.addWidget(scroll_area)

        scroll_widget = QWidget()
        scroll_layout = QFormLayout(scroll_widget)

        for i in range(200):
            scroll_layout.addRow(QLabel('Label #{}'.format(i)))

        scroll_area.setWidget(scroll_widget)

        QScroller.grabGesture(
            scroll_area.viewport(), QScroller.LeftMouseButtonGesture
        )


if __name__ == '__main__':
    app = QApplication(sys.argv)
    main_window = MainWindow()
    main_window.show()
    sys.exit(app.exec_())

QScroller is a new class in Qt5 that makes kinetic scroll easy with sensible defaults for supported Qt platforms.

One gotcha when using with a QScrollArea is that grabbing QScroller.TouchGesture will likely only work if the platform supports touch in a special way. It does not appear to work correctly on Window's devices with touchscreens, but the extent of my testing is limited. QScroller.LeftMouseButtonGesture seems to work perfectly while also allowing you to test on non-touch devices.