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問題描述
I want to specify a special button so I don't have to adjust every button I use, however I want it's event to trigger a function in a different class.
main.py
from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.stacklayout import StackLayout
from kivy.properties import ObjectProperty
class FancyButton(Button):
imp = ObjectProperty(None)
class Important(StackLayout):
def NoInspiration(self, smile):
print("Received: {}".format(smile))
class TestApp(App):
def build(self):
pass
if __name__ == '__main__':
TestApp().run()
test.kv (working)
#:kivy 1.9.0
<FancyButton@Button>:
on_release: self.parent.NoInspiration(':)')
<Important>:
id: imp
FancyButton:
text: "smiley"
BoxLayout:
Important
Received: :)
test.kv (not working)
#:kivy 1.9.0
<FancyButton>:
on_release: self.parent.NoInspiration(':)')
<Important>:
id: imp
BoxLayout:
FancyButton:
text: "smiley"
BoxLayout:
Important
In the 2nd test.kv I added 'BoxLayout:' in front of FancyButton and suddenly I get the error:
AttributeError: 'BoxLayout' object has no attribute 'NoInspiration'
Question
- Why does self.parent only refer to the direct parent and not < Important > in the 2nd example?
- How can I have on_release: in < FancyButton > point to the function NoInspiration() while keeping the function in < Important >?
Follow up questions
- Kivy rule inherence with add_widget()
- Kivy outside rule inherence 2
解決方案
Change the kv to this
<FancyButton>:
on_release: self.imp.NoInspiration(':)')
<Important>:
id: imp
BoxLayout:
FancyButton:
text: "smiley"
imp: root
BoxLayout:
Important
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