PyQt: 练习 QRubberBand

import sys
from PyQt5.Qt import *


class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setup_ui()

    def setup_ui(self):
        self.setWindowTitle("Qt桌面应用程序")
        self.resize(300, 300)

        for i in range(30):
            self.check_box = QCheckBox(f"复选{i + 1}", self)
            self.check_box.move(i % 4 * 60 + 10, i // 4 * 30 + 10)

        self.rubber_band = QRubberBand(QRubberBand.Rectangle, self)

    def mousePressEvent(self, a0) -> None:
        print(a0.pos())
        self.original_position = a0.pos()
        self.rubber_band.setGeometry(QRect(self.original_position, QPoint()))
        self.rubber_band.setVisible(True)
        return super(Window, self).mousePressEvent(a0)

    def mouseMoveEvent(self, a0) -> None:
        self.rubber_band.setGeometry(QRect(self.original_position, a0.pos()).normalized())
        return super(Window, self).mouseMoveEvent(a0)

    def mouseReleaseEvent(self, a0) -> None:
        for check_box in self.findChildren(QCheckBox):
            if self.rubber_band.geometry().contains(check_box.geometry()):
                check_box.toggle()
        self.rubber_band.setVisible(False)
        return super(Window, self).mouseReleaseEvent(a0)


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