问MainWindow Widget Resize (Pyside)

EN

def setupGridUI(self):
    widget = QWidget()
    layout = QGridLayout()
    width, height = 10, 10

    root_x, root_y = random.randrange(width), random.randrange(height)

    for x in range(width):
        for y in range(height):
            random_wall = random.randrange(3)
            if x == root_x and y == root_y:
                label = ClickableLabel(x, y, False, True)
            else:
                if random_wall == 0:
                    label = ClickableLabel(x, y, True)
                else:
                    label = ClickableLabel(x, y)

            layout.addWidget(label, x+1, y+1) # modified

    # added the following 4 lines
    layout.setRowStretch(0, 1);
    layout.setRowStretch(height+2, 1);
    layout.setColumnStretch(0, 1);
    layout.setColumnStretch(width+2, 1);

    widget.setLayout(layout)
    self.setCentralWidget(widget)

    self.setStyleSheet("QMainWindow {background: 'purple'}")