DragBehavior lost when moving widget after creation

[Frédéric]

Hello!

Il I change the position of a  a widget from python, the DragBehavior isn't working anymore.

How can I recover the dragbehavior after changing position?

Here's an exemple showing the non-draggable widget. Without the on_start function, it's draggable

from kivy.uix.label import Label
from kivy.app import App
from kivy.uix.behaviors import DragBehavior
from kivy.lang import Builder


kv = '''
<DragLabel>:
    # Define the properties for the DragLabel
    drag_rectangle: self.x, self.y, self.width, self.height
    drag_timeout: 10000000
    drag_distance: 0

FloatLayout:
    DragLabel:
        id:drag
        size_hint: 0.25, 0.2
        text: 'Drag me'
'''


class DragLabel(DragBehavior, Label):
    pass


class TestApp(App):
    def on_start(self, **kwargs):
        self.root.ids.drag.pos_hint = {"x":0.5, "y":0.5}
       
    def build(self):
        return Builder.load_string(kv)
       

TestApp().run()

[ELLIOT GARBUS]

Do not use a pos_hint to set the position.  The pos_hint is "overriding" drag.

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From: kivy-...@googlegroups.com <kivy-...@googlegroups.com> on behalf of Frédéric <freder...@gmail.com>
Sent: Monday, July 8, 2024 11:03 AM
To: Kivy users support <kivy-...@googlegroups.com>
Subject: [kivy-users] DragBehavior lost when moving widget after creation

 

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[Frédéric]

OK,

I'll change my code to use pos instead of pos_hint

Thanks!

Frederic