Call function from class from function outside class
Kamil Widzyk
from kivy.uix.screenmanager import ScreenManager, Screen
value1 = 0
value2 = 0
def loop(data):
# This function is called every 1s by Clock
# I want to call 'increase' function from 'test1' class
# and 'decrease' function from 'test2' class
pass
class test1(Screen):
global value1
value1 += 1
self.label1.text = "Increasing: " + str(value1)
class test2(Screen):
def decrease(self):
global value2
value2 -= 1
self.label2.text = "Decreasing: " + str(value2)
class MainWindow(App):
def build(self):
sm = ScreenManager()
sm.add_widget(test1(name="test1"))
sm.add_widget(test2(name="test2"))
return sm
Clock.schedule_interval(loop, 1)
MainWindow().run()
<test1>:
label1: label1
BoxLayout:
Button:
text: "Go to test2"
size_hint: 0.5, 0.1
on_release:
app.root.transition = FadeTransition(duration=0.1)
root.manager.current = "test2"
Label:
id: label1
text: "Increasing: 0"
<test2>:
label2: label2
BoxLayout:
Button:
size_hint: 0.5, 0.1
text: "Go to test1"
on_release:
root.manager.current = "test1"
Label:
id: label2
text: "Decreasing: 0"
Elliot Garbus
I have made a number of changes to your code.
I combined the kv code and python code into one file, this is to simplify sharing. This uses Builder.
I moved the 2 global variables value1 and value2 to their respective screens. These values ‘belong’ to the screen, so it make sense to have them be in the class. I used kivy numeric properties to declare these variables.
The kv code was changed to use the kivy NumericProperties.
I moved the ScreenManger and instancing of the screens to kv.
I moved the loop method to be under app, and the Clock.schedule_interval to be called from on_start().
In loop the methods are accessed as:
self.root.get_screen('test1').increase()
self is App
root is the ScreenManager
get_screen() returns the screen widget.
Hope that makes sense.
from kivy.app import App
from kivy.lang import Builder # moved all to on file to simplify posting
from kivy.clock import Clock
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.properties import NumericProperty # use for values
kv = """
#: import FadeTransition kivy.uix.screenmanager.FadeTransition
<test1>:
label1: label1
BoxLayout:
Button:
text: "Go to test2"
size_hint: 0.5, 0.1
on_release:
app.root.transition = FadeTransition(duration=0.1)
root.manager.current = "test2"
Label:
id: label1
text: "Increasing: " + str(root.value1) # printing the property
<test2>:
label2: label2
BoxLayout:
Button:
size_hint: 0.5, 0.1
text: "Go to test1"
on_release:
app.root.transition = FadeTransition(duration=0.1)
root.manager.current = "test1"
Label:
id: label2
text: "Decreasing: " + str(root.value2) # printing from the property
ScreenManager:
Test1:
name: 'test1'
Test2:
name: 'test2'
"""
# value1 = 0 ### These values are associated with the screens - that is where they belong
# value2 = 0
class Test1(Screen):
value1 = NumericProperty()
def increase(self):
self.value1 += 1 # use the property
class Test2(Screen):
value2 = NumericProperty()
def decrease(self):
self.value2 -= 1
class MainWindow2(App):
def build(self):
# sm = ScreenManager() # moved this code to kv
# sm.add_widget(test1(name="test1"))
# sm.add_widget(test2(name="test2"))
# return sm
return Builder.load_string(kv)
def on_start(self):
Clock.schedule_interval(self.loop, 1)
def loop(self, dt): # moved into app, out of global scope
# This function is called every 1s by Clock
# I want to call 'increase' function from 'test1' class
# and 'decrease' function from 'test2' class
self.root.get_screen('test1').increase()
self.root.get_screen('test2').decrease()
MainWindow2().run()
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Kamil Widzyk
@ElliotG, Big thanks to you. Code works perfect. Thanks you again!