change label when pushing button

[Luigi Marongiu]

Hello,

Thanks to previous hints, I can now change the icon of a button upon clicking. The page I am building has a button and a label underneath. How can i change the text of the label upon clicking on the kv file? 

The python file is:

```

import kivy

kivy.require('1.10.1')

from kivy.app import App

from kivy.uix.label import Label

from kivy.uix.boxlayout import BoxLayout

from kivy.uix.behaviors import ButtonBehavior

from kivy.uix.image import Image

class myLayout(BoxLayout):

    pass

class ImageButton(ButtonBehavior, Image):

    pass

class MyApp(App):

    def build(self):

        return myLayout()

if __name__ == "__main__":

    MyApp().run()

```

the kivy file is:

```

#:kivy 1.10.1

<myLayout@BoxLayout>:

  orientation: "vertical"

  ImageButton:

    size_hint_x: 1

    size_hint_y: 0.8

    source: './Actions-media-playback-pause-icon.png'

    on_release:

      self.source = './Actions-media-playback-start-icon.png'

    on_press:

      self.source = './Actions-media-playback-pause-icon.png'

  Label:

    size_hint_x: 1

    size_hint_y: 0.2

    text: "pause"

    on_press:

      text:"pause"

    on_release:

      text: "PLAY"

```

but when I run with python3 I get `AttributeError: 'weakref' object has no attribute 'cline_in_traceback'`

Thank you

[Elliot Garbus]

You need to change self.text

 

  Label:

    size_hint_x: 1

    size_hint_y: 0.2

    text: "pause"

    on_press: self.text = "pause"

    on_release: self.text = "PLAY"

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[Kuam]

First off, your Label is just that, a Label that displays text.  It won't have the on_press attribute built into it like a Button does, which is likely where your error is coming from.

Now you could potentially do an on_touch_down event, but that's probably more than you really need.  

If I'm understanding you correctly you want the Label text to change when the button is pressed?  One way to do that would be to give the Label an id and reference it that way, then just add another set of on_press/on_release to handle changing the text.  So your code would be something like this:

ImageButton:

    size_hint_x: 1

    size_hint_y: 0.8

    source: './Actions-media-playback-pause-icon.png'

    on_release:

      self.source = './Actions-media-playback-start-icon.png'

    on_press:

      self.source = './Actions-media-playback-pause-icon.png'

    on_press: playpauselabel.text = 'Pause'

    on_release: playpauselabel.text = 'Play'

Label:

    size_hint_x: 1

    size_hint_y: 0.2

    id: playpauselabel

    text: 'Play'

One other thing, your size hint for your widgets can just be in this format: size_hint: 1,.2   rather than doing both size_hint_x, size_hint_y....save you some typing :)

[Elliot Garbus]

Oops… of course Kuan is correct!

 

From: Kuam
Sent: Wednesday, July 3, 2019 7:35 AM
To: Kivy users support

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[Luigi Marongiu]

Thank you, it worked!

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Best regards,
Luigi

[Prabhat Mohanty]

Give Label an id. then call by id and its text property.