为什么我的Kivy AnchorLayout卡在左下角?

问题描述

我在my.kv文件中有以下代码:

I have the following code in my.kv file:

<UIWidget>:
    AnchorLayout:
        anchor_x: 'right'
        anchor_y: 'top'
        Button:
            size_hint: None, None
            text: 'Build'

UI Widget是一个空的Widget子类.

UI Widget is an empty Widget subclass.

class UIWidget(Widget):
    pass

我的根窗口小部件将UIWidget加载到自身中，如下所示:

My root widget loads UIWidget into itself as follows:

class SimplifiedGameWidget(Widget):
    def __init__(self, **kwargs):
        super().__init__(self, **kwargs)
        self.layout = RelativeLayout(size_hint=(None, None))
        self.layout.size = (1024, 768)
        ui_widget = UIWidget()
        ui_widget.size_hint = (1, 1)
        self.layout.add_widget(ui_widget)
        self.add_widget(self.layout)

 class MyApp(App):
     def build(self):
         return SimplifiedGameWidget()

(完整代码: http://pastie.org/10791067 )

我希望得到的东西:

• GameWidget> RelativeLayout> UIWidget，其大小均按窗口大小
• 屏幕右上方的UIWidget子级的AnchorLayout
• AnchorLayout中的按钮，其大小为右上角的默认大小.

我实际上得到的是:

• GameWidget> RelativeLayout> UIWidget，其大小均按窗口大小
• 位于屏幕左下方的UIWidget子级的AnchorLayout，尺寸为100x100px
• AnchorLayout中按钮的默认大小，左下角为100x100px

我在做什么错了?

推荐答案

Widget不会影响其子代的大小或位置，无论是否带有size_hint/pos_hint-这是Layout s.由于Widget的默认位置为(0, 0)，因此AnchorLayout结束于左下角，默认大小为(100, 100).我可能会改为将SimplifiedGameWidget扩展为FloatLayout，并使UIWidget直接扩展AnchorLayout而不是包含一个:

Widgets don't affect the size or position of their children, with or without size_hint/pos_hint - this is the purpose of Layouts. Since the default position of a Widget is (0, 0), the AnchorLayout ends up in the lower-left corner, with the default size (100, 100). I would maybe switch the SimplifiedGameWidget to extend FloatLayout instead, and make UIWidget extend AnchorLayout directly instead of containing one:

<UIWidget>:
    anchor_x: 'right'
    ...

<SimplifiedGameWidget>:
    UIWidget

和:

class UIWidget(AnchorLayout):
    pass

class SimplifiedGameWidget(FloatLayout):
    pass

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