About scrollcontainer , The problem is shown in the video

[YTLoudYN]

TEST.mp4

'''
import toga
from toga.constants import COLUMN, ROW, RED
from toga.style import Pack

class TEST(toga.App):
TOGGLE_CHUNK = 10

vscrolling = True
hscrolling = False
scroller = None

def startup(self):

    self.main_box = toga.Box(style=Pack(direction=COLUMN))

    self.box = toga.Box()
    self.box.style.direction = COLUMN
    self.box.style.padding = 10
    self.scroller = toga.ScrollContainer(
        horizontal=self.hscrolling, vertical=self.vscrolling
    )

    self.box2 = toga.Box()
    self.box2.add(
        toga.Label('Thie is a TEST( Print 0 ~ 100 )'),
        toga.Button('START',on_press=self.start_on)
    )
    self.box.add(self.box2)

    self.scroller.content = self.box

    self.main_window = toga.MainWindow(title=self.formal_name)
    self.main_window.content = self.scroller
    self.main_window.show()

def start_on(self,args):

    self.box.remove(self.box2)

    self.box2 = toga.Box(style=Pack(direction=COLUMN))

    for i in range(100):
        self.box2.add(
            toga.Label('>>>' + str(i))
        )

    self.box.add(
        toga.Label('Print 0 ~ 100', style=Pack(color=RED)),
        self.box2
    )
    self.main_window.show()

def main():
return TEST('TEST','id')

if name == 'main':
main().main_loop()
'''

[freakboy3742]

Looks like you've found a bug in ScrollContainer. If I had to guess, I'd say that the scroller isn't responding to dynamic changes in the inner content.

[YTLoudYN]

https://user-images.githubusercontent.com/131869902/235331233-77908ebb-62d2-43c2-99ad-b9128c845a35.mp4
Rolling container example run: video above

This is the same problem as the scrollcontainer in the example, please ask, is there any solution?

[freakboy3742]

You've found a bug. If I had a workaround, I'd provide one. If this is affecting you, I'd suggest investigating the internals and trying to debug the problem.