Kivy 规则继承 add_widget()

Question

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main.py

from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.stacklayout import StackLayout
from kivy.properties import ObjectProperty
from kivy.factory import Factory


class FancyButton(Button):
    imp = ObjectProperty(None)


class Important(StackLayout):

    def NoInspiration(self, smile):
        print("Received: {}".format(smile))

    def AddFancy(self):
        temp = Factory.FancyButton(text='f', imp = self.ids.imp)
        self.ids.boxy.add_widget(temp)


class TestApp(App):
    def build(self):
        pass

if __name__ == '__main__':
    TestApp().run()

test.kv

#:kivy 1.9.0
#:import App kivy.app

<FancyButton>:
    on_release: self.imp.NoInspiration(':)')


<Important>:
    id: imp

    BoxLayout:
        id: boxy
        orientation: 'vertical'

        FancyButton:
            text: "smiley"
            imp: root

        Button:
            text: "add fancy"
            on_release: imp.AddFancy()


BoxLayout:
    Important

在test.kv中，FancyButton中的函数调用函数NoInspiration()有效，因为.kv中定义的FancyButton有imp:root，所以它知道它应该在<重要>中寻找函数:.

问题

然而，当您在 Python 中通过 add_widget 创建 FancyButton 时，imp: root 如何工作？

现在，当我按下按钮 "add fancy" 时，出现错误：

File "main.py", line 18, in AddFancy temp = Factory.FancyButton(text='f', imp = self.ids.imp) File "properties.pyx", line 756, in kivy.properties.ObservableDict.__getattr __ (kivy/properties.c:11093) AttributeError: 'super' object has no attribute '__getattr __'

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Answer 1

Widget.ids 仅包含其子项的 ID（http://kivy.org/docs/api-kivy.uix.widget.html#kivy.uix.widget.Widget.ids。不需要小部件本身的 ID，因为您可以直接传递它 - 在您的情况下使用 self，因为您正在从方法内部传递对小部件的引用：

class Important(StackLayout):
    def NoInspiration(self, smile):
        print("Received: {}".format(smile))

    def AddFancy(self):
        print(self.ids) # only returns {'boxy': <weakproxy at 0000000002D119A8 to BoxLayout at 0000000002D026A8>}
        self.ids.boxy.add_widget(FancyButton(text='f', imp = self)) # no need to use a factory

Kivy 规则继承 add_widget()

Kivy rule inherence with add_widget()

python

kivy

问题

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