Change a variable from another class (KIVY)

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A simplified version of my problem is:

<ValueInput>:
     TextInput:
         id: value_input
         on_text_validate: root.value_input(value_input.text)

<DefineVariables>:
     Button:
        on_press: root.clear_text()

I have two different classes ValueInput and DefineVariables. What I want to happen is that when I press the Button from <definevariables>, the text of which the user has written in TextInput from <valueinput> shall be cleared.

In the .py file:

class MainWidget(BoxLayout):

    ValueInput = NumericProperty(0)


class ValueInput(MainWidget):

    def value_input(self, ValueInput):
        ValueInput = ValueInput
        self.ids.value_input.text = ""  #This clears the TextInput box.


class DefineVariables(MainWidget):

    def clear_text(self):
        CLEAR HERE

If I go to the .py file I figured out that if i do

self.ids.value_input.text

in the ValueInput class, it does clear the text when pressing enter. BUT, I dont want the

self.ids.value_input.text

function to be in that class. I want to do

self.ids.value_input.text

when I press the button of which I have decleared in the Kivy file.

What happens if I do

def clear_text(self):
    self.ids.value_input.text = ""

and call the clear_text function using root.clear_text() in the .kv file is that i get this error:

AttributeError: 'super' object has no attribute '__getattr__'

How could I make this work?

What I have tried:

Using a clear_text function in the DefineVariables but to no success.

Posted 2-Nov-21 0:19am

Daniel Lidén

Updated 29-May-23 1:12am

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Comments

Richard MacCutchan 2-Nov-21 8:12am

You need to call the clear_text method on an instance of the ValueInput class. But I cannot see from your code exactly what is happening, or what produces that error.

Daniel Lidén 2-Nov-21 8:43am

Sorry I do not see what you mean.
Here is the exact code producing the error.
main.py file:

from kivy.app import App
from kivy.properties import NumericProperty
from kivy.uix.boxlayout import BoxLayout


class MainWidget(BoxLayout):

    ValueInput = NumericProperty(0)


class ValueInput(MainWidget):

    def value_input(self, ValueInput):
        Value = ValueInput
        print(Value)


class DefineVariables(MainWidget):

    def clear_text(self):
        self.ids.value_input.text = ""


class CalcApp(App):
    pass


CalcApp().run()

calc.kv file:

MainWidget:
    ValueInput:
    DefineVariables:


<ValueInput>:
    TextInput:
        id: variable_input
        multiline: False
        on_text_validate: root.value_input(variable_input.text)

<DefineVariables>:
    Button:
        text: "Clear"
        on_press: root.clear_text()

I run the application. A TextInput next to a Button appears. I write something in the TextInput and press enter. Then when I press "Clear" button its supposed to remove what I have written in the TextInput box but instead I get

 AttributeError: 'super' object has no attribute '__getattr__'

Could you change the code so I can see what I need to do. First time ever using Kivy.

Richard MacCutchan 2-Nov-21 9:03am

Sorry, I cannot see what the error message means. You need to check the KIVY (whatever that is) documentation to see that your class designs are correct.

Most likely a better place for assistance would be the kivy help forum.

Daniel Lidén 2-Nov-21 9:12am

Ok! Thanks anyways!

Richard MacCutchan 2-Nov-21 9:48am

Try this:

    def clear_text(self):
        self.ids['value_input'] = ""

Daniel Lidén 2-Nov-21 11:05am

At least It removes the error, but unfortunatly does not clear the TextInput.

Richard MacCutchan 2-Nov-21 11:10am

You need to look at the kivy documentation to find out exactly how to set the content of a widget.

Richard MacCutchan 2-Nov-21 9:18am

I have just taken a look at the Kivy example Pong Game Tutorial — Kivy 2.0.0 documentation[^], which I recommend. From what I can understand I am not sure that you can call a method from the Widget object. So you probably need an event handler (on_touch_down or similar) that reacts to the button being pressed..

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Muhammad ali Mansoor · Answer 1 · 2023-05-29T01:12:00

Solution 2

Kv
<ValueInput>:
value_input:value_input
TextInput:
id: value_input
pos: 100, 100

<DefineVariables>:
Button:
on_press: root.clear()
on_release: root.fill()

MainWidget:
<MainWidget>:

ValueInput:
DefineVariables:

Python code

class ValueInput(Widget):

text = 'p'

def __init__(**kwargs)
super ().__init__(**kwargs)
Clock.schedule_interval (self.clear2, 1/60)

def clear1(self):
Valueinput.text = ""

def clear2(self):

if self.text == "":
self.value_input.text = self.text

else:
pass

class DefineVariables(MainWidget):

def clear(self):
ValueInput.clear1(self)

def fill(self):
ValueInput.text = 'p'

class MainWidget(widget):
pass

I write this by mobile so take care of common mistakes
And it's working like you want

Posted 29-May-23 1:12am

Muhammad ali Mansoor

Updated 30-May-23 2:33am

v5

Comments

Richard Deeming 30-May-23 4:42am

"I know the answer, but I'm not telling you unless you reply" is clearly not a solution to this question.

And quite frankly, it stinks of a scam.

Muhammad ali Mansoor 30-May-23 8:30am

Here's your solution

Dave Kreskowiak 30-May-23 8:53am

Considering this is TWO YEARS later, I don't think the OP is still looking for an answer.

Muhammad ali Mansoor 30-May-23 9:04am

Yeah I know for that I say first that if anybody wants answer then reply and someone reply me that you're a scammer

Dave Kreskowiak 30-May-23 9:37am

Yeah, and I agree with him. Just posting that message screams, "I'm a scammer trying to get your email address so I can send you tons of spam!"

Next time, look at the date on the question. If it's years later, chances are really good you're not going to get a reply.

Daniel Lidén 30-May-23 9:54am

Guys. I litteraly don’t even remeber what programing language this is and don't care😂 Ima embedded engineer now🤣 but I like the drama that came from nowhere ;)

Dave Kreskowiak 30-May-23 10:40am

Hey Daniel. Sorry for the notifications you're getting on this. This guy decided to resurrect your two-year-old question.

Muhammad ali Mansoor 30-May-23 10:04am

You said that he will not reply you

Dave Kreskowiak 30-May-23 10:38am

No, I said the chances were "really low".