跟进问题:Kivy outside rule inherence
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()起作用,因为.kv中定义的FancyButton有imp:root,所以它知道它应该在&lt;中查找函数。重要&gt;:。
但是,当你通过Python中的add_widget创建FancyButton时,imp:root是如何工作的?
现在当我按下按钮&#34;添加花式&#34;我收到错误:
文件&#34; main.py&#34;,第18行,在AddFancy中 temp = Factory.FancyButton(text =&#39; f&#39;,imp = self.ids.imp) 文件&#34; properties.pyx&#34;,第756行,在kivy.properties.ObservableDict .__ getattr __(kivy / properties.c:11093) AttributeError:&#39; super&#39;对象没有属性&#39; __ getattr __&#39;
答案 0 :(得分:1)
Widget.ids
仅包含其子级的ID http://kivy.org/docs/api-kivy.uix.widget.html#kivy.uix.widget.Widget.ids。小部件本身的ID不需要,因为您可以直接传递它 - 在您的情况下使用self
,因为您从方法内部传递了对窗口小部件的引用:
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