01-QScrollBar-功能作用.py

import sys

from PyQt5.Qt import *


class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("QScrollBar")
        self.resize(500, 500)
        self.move(400, 250)
        self.setup_ui()

    def setup_ui(self):
        slb = QScrollBar(Qt.Horizontal, self)
        slb.resize(200, 20)
        slb.move(100, 400)

        slb.valueChanged.connect(lambda val: print(val))
        slb.setPageStep(40)  # PageStep 可以控制滑块长度

        slb.grabKeyboard()  # 默认不捕捉键盘，即不响应PgUp/PgDn


if __name__ == "__main__":
    app = QApplication(sys.argv)

    window = Window()
    window.show()

    sys.exit(app.exec_())