CODEWITHSUNDEEP
pythonkivy
TryTrystMy
TryTrystMy

Reputation: 73

Kivy ids in python code

main:

from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from kivy.uix.widget import Widget


class testclass:
    def someth(txt):
        print (txt)
        #how get  access to textinput from begin Screen here?
class BeginScreen(Screen):
    def __init__(self,**kwargs):
        super().__init__()
        self.layout =BoxLayout(orientation='vertical',padding=20,spacing=5,)
        self.btn=Label(text=str('Hello'))
        self.layout.add_widget(self.btn)
        self.btn=TextInput(id='test',text='')
        self.layout.add_widget(self.btn)
        self.btn=Button(text='Button!', on_press=testclass.someth('?'))
        # what write in ? to send textinput text to testclass.someth?
        self.layout.add_widget(self.btn)
        self.add_widget(self.layout)
        print(self.layout.ids) #why i have no ids? textinput have id

class TestApp(App):   
    from kivy.config import Config
    Config.set('graphics', 'width', '800')
    Config.set('graphics', 'height', '400')
    def build(self):
        sm = ScreenManager()
        sm.add_widget(BeginScreen(name='test'))
        return sm
TestApp().run()

So how can i access the textinput? I have id='test' but when i printing layouts id is saying i have noone. Why? Someone can explain me what im doing wrong and how can i make it good?

Upvotes: 2

Views: 17135

Answers (1)

ikolim
ikolim

Reputation: 16041

from functools import partial

To access the textinput in your external method, you could use partial functions or lambda function.

self.ids

You are getting None or empty dictionary because you don't have a kv file.

Note

When your kv file is parsed, kivy collects all the widgets tagged with id’s and places them in this self.ids dictionary type property.

Please refer to my example below for deatils.

Example

main.py

from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from functools import partial


class testclass:
    def someth(*args, txt):
        print(txt)


class BeginScreen(Screen):
    def __init__(self, **kwargs):
        super(BeginScreen, self).__init__(**kwargs)
        layout = BoxLayout(orientation='vertical', padding=20, spacing=5)
        layout.add_widget(Label(text=str('Hello')))

    # layout.add_widget(TextInput(id='test', text=''))  # id in python+kivy is deprecated
    txtInput = TextInput(text='text input')
    layout.add_widget(txtInput)
    self.ids['test'] = txtInput

    layout.add_widget(Button(text='Button!', on_press=partial(testclass.someth, txt=self.ids.test.text)))
    self.add_widget(layout)

    print("self.ids={}".format(self.ids))
    print("self.ids['test']={}".format(self.ids['test']))
    print("self.ids['test'].text={}".format(self.ids['test'].text))
    print("self.ids.test.text={}".format(self.ids.test.text))
    for key, val in self.ids.items():
        print("key={0}, val={1}".format(key, val))


class TestApp(App):
    from kivy.config import Config
    Config.set('graphics', 'width', '800')
    Config.set('graphics', 'height', '400')

    def build(self):
        sm = ScreenManager()
        sm.add_widget(BeginScreen(name='test'))
        return sm

TestApp().run()

Output

Button Pressed

Upvotes: 3

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