如何使用Python在GTK-3中显示比例或vscale

Question

我有显示VScale的代码。小部件显示一个指示当前值的数字。它通过更改值来响应分页事件。但是，没有slider.There只是一个小圈子。如何让它正确显示，以便用户可以通过拖动滑块来调整该值？

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下面是我的代码：

class ThresholdingWindow(SuperClass):
    def __init__(self, parent, controller):
        super(ThresholdingWindow, self).__init__(parent, controller)
        self.set_title("Thresholding")

        self.controller = controller

        button = Gtk.Button.new_with_label("Apply")
        self.box.pack_start(button, True, True, 0)

        button2 = Gtk.Button.new_with_label("Back to Main")
        button2.connect("clicked", self.on_back_clicked)
        self.box.pack_start(button2, True, True, 0)

        adjustment = Gtk.Adjustment(0.0,0.0,1.0,.01,.02)
        # scale = Gtk.Scale.new(Gtk.Orientation.VERTICAL, adjustment)
        scale = Gtk.VScale.new(adjustment)
        scale.set_digits(3)
        # scale = Gtk.VScale(adjustment)
        self.box.pack_start(scale, False, False,0)

Answer 1

在stackoverflow上找到：

        scale.set_size_request(30,100)

看起来屏幕上没有足够的“空间”来容纳滑块。