Kivy Scrolling Causes to Be Disappear of Results For a While After Removing (Clearing) and Creating Widgets
Mecra Yavcin
Elliot Garbus
Looking at your video, I would suggest setting scroll_y to 1 after repopulating the scrollview.
Not related to your problem – but you can simplify clear_widgets by using the clear_widgets method.
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Mecra Yavcin
I am not as good as in Python and Kivy.
All i studied 500 hours on Python and 15 hours on Kivy.
So i need your support ElliotG.
I did not exactly understand 'setting scroll_y to 1 after repopulating the scrollview'
I thought how to do that.
I tried something and but not worked.
Before i had bought a Kivy course from udemy and i tried Property on this project to solve this.
What i did?
If you help me to fix this bug i will be gratefull.
Elliot Garbus
I don't know why scroll_y 1 or 0 is important for my bug?
It looks to me like the ScrollView is set to a ‘middle value’ the widgets are then removed, and scroll is in the incorrect position. My thought was that resetting the scroll_y value would reposition all of the widgets in the scroll view.
Here is an example that shows a scroll view, and changes the scroll_y value.
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.button import Button
from kivy.uix.scrollview import ScrollView
kv = """
<ScrollButton>:
size_hint_y: None
height: dp(48)
<SV>:
BoxLayout:
orientation: 'vertical'
id: scroll_box
size_hint_y: None
height: self.minimum_height
BoxLayout:
orientation: 'vertical'
spacing: dp(10)
Label:
text: 'Scroll Reset Example'
size_hint_y: None
height: dp(30)
SV:
id: sv
BoxLayout:
size_hint_y: None
height: dp(48)
Button:
text: 'Set scroll_y = 0'
on_release: sv.scroll_y = 0
Button:
text: 'Set Scroll_y = 1'
on_release: sv.scroll_y = 1
Button:
text: 'Clear widgets'
on_release: sv.ids.scroll_box.clear_widgets()
Button:
text: 'Add widgets'
on_release: sv.add_buttons()
Button:
text: 'Add & Scroll'
on_release:
sv.add_buttons()
sv.scroll_y = 1
"""
class ScrollButton(Button):
pass
class SV(ScrollView):
def add_buttons(self):
if not self.ids.scroll_box.children:
for i in range(100):
self.ids.scroll_box.add_widget(ScrollButton(text=f'Button {i}'))
class ScrollApp(App):
def build(self):
return Builder.load_string(kv)
def on_start(self):
self.root.ids.sv.add_buttons()
ScrollApp().run()
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Elliot Garbus
I wonder that Can i enforce the required order with Clock.scheule_once()?
Create a new method for your Clock.schedule_once().
…
Clock.schedule_once(self.two_methods)
def two_methods(self, dt):
fun_one() # these will be called in order
fun_two()
From: Mecra Yavcin
Sent: Thursday, February 9, 2023 12:43 AM
To: Kivy users support
Subject: Re: [kivy-users] Kivy Scrolling Causes to Be Disappear of ResultsForaWhile After Removing (Clearing) and Creating Widgets
Thanks very much. Example code was usefull me and i also fixed my problem. I deleted all Clock.scheule_once() codes and i used mythread =hreading.Thread(target=self.clear_widgets)
mythread.start() to enforce the required order for all defs(). I wonder that Can i enforce the required order with Clock.scheule_once()?
Thanks very much
8 Şubat 2023 Çarşamba tarihinde saat 19:29:38 UTC+3 itibarıyla ElliotG şunları yazdı:
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