disable bouncing down when scrolling up with scrollview

[xavier cattelain]

Hi to all !

Using kivy 1.11.1

Hi I tried without success to disable the bounce effect when finger scrolling and reaching the top, kivy bounce back a specific distance.  I created 100 buttons in a vertical gridlayout to see the effect on y axis when I reach by finger scrolling the first button, the scrollview top, and I stop scrollling, kivy bounce back and goes to the 4th button

Do you know how to stop this boucing ?

Here is the sample : 

import kivy

kivy.require('1.11.1')

from kivy.uix.gridlayout import GridLayout

from kivy.uix.boxlayout import BoxLayout

from kivy.uix.button import Button

from kivy.uix.scrollview import ScrollView

from kivy.core.window import Window

from kivy.app import runTouchApp

from kivy.app import App

from kivy.effects.scroll import ScrollEffect

from kivy.effects.dampedscroll import DampedScrollEffect

from kivy.properties import NumericProperty

layout = GridLayout(cols=1, spacing=10, size_hint_y=None)

layout.bind(minimum_height=layout.setter('height'))

for i in range(100):

    btn = Button(text=str(i), size_hint_y= None, height=40)

    layout.add_widget(btn)

root = ScrollView(size_hint=(1, None),\

    size=(Window.width, Window.height),\

    bar_width = 10, bar_color= (0,1,0,1),\

    scroll_type = ['bars', 'content'])

root.add_widget(layout)

root.effect_y = ScrollEffect(overscroll = 0)

print(root.effect_y)

runTouchApp(root)

a=2

[Elliot Garbus]

Your code stops the bounce when I run in on Windows10.   When I comment out the line below, the bounce comes back.  The overscroll arg is not necessary.

root.effect_y = ScrollEffect(overscroll = 0)

 

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[xavier cattelain]

Hi Elliot, thank you for your quick response, I'm running kivy on a windows 10 also.

My issue is still there, mybe i used a confused word (bounce) sorry I will try to be more explicit. Here is my action when the app is running : 

1. I scroll to reach the top with a fast movement of 2 fingers.

2. kivy scrolls up as expected

3. My fingers quit the touchpad

4 kivy continue to going up and its okay

5. kivy goes down, and this is the default reaction I'm trying to stop

Any idea how ? Thanks, i'm trying to modify every class scrollview attributes, I'll comment if i find something but it looks too complicated for me (I'm a kivy beginner)

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[Elliot Garbus]

I don’t see the behavior that you see.  This might be related to a touchpad issue on your machine, a driver or a setting.

 

Something else to try:

2 fingers on the touchpad is interpreted the same as the mouse scroll wheel.

Try setting a lower value scroll_wheel_distance

root.scroll_wheel_distance = 5

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[xavier cattelain]

Hi Elliot,

I figured it out that I have Windows 8.1 *64 :)

Well I've tried to uninstall-install 2 touchpad driver

     -Synaptics 17.0.6.13

     -Elantech 11.6.27.201

I tried to modify screel_wheel_distance to 5

without success

But I found maybe a beginning of a solution that if I take back my previous steps 

1. I scroll to reach the top with a fast movement of 2 fingers.

2. kivy scrolls up as expected

3. My fingers quit the touchpad

4 kivy continue to going up and its okay

5. Before kivy goes down, I do a quick movement on X-axis with 2 fingers, whitch stops the scrolling down, so the idea will be to fake a scroll on X axis maybe ?

Do you know how to do that ?

 

[Elliot Garbus]

I don’t understand your question.

 

From: xavier cattelain
Sent: Friday, June 26, 2020 1:56 AM
To: Kivy users support
Subject: Re: [kivy-users] disable bouncing down when scrolling up with scrollview

 

Hi Elliot,

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[xavier cattelain]

No problem, i can explain in details : 

i noticed that at the 5th step, doing a manual scroll on x-axis with 2 fingers, stopped the scroll down. I thought maybe faking a scroll on X axis worth the try.

But i don't know how. maybe with a event like on_release or other event that is triggered when i stop scrolling and i can do a scroll_to method. I'll try this

Le vendredi 26 juin 2020 14:49:37 UTC+2, Elliot Garbus a écrit :

I don’t understand your question.

 

From: xavier cattelain
Sent: Friday, June 26, 2020 1:56 AM
To: Kivy users support
Subject: Re: [kivy-users] disable bouncing down when scrolling up with scrollview

 

Hi Elliot,

 

I figured it out that I have Windows 8.1 *64 :)

 

Well I've tried to uninstall-install 2 touchpad driver

     -Synaptics 17.0.6.13

     -Elantech 11.6.27.201

 

I tried to modify screel_wheel_distance to 5

without success

 

But I found maybe a beginning of a solution that if I take back my previous steps 

 

1. I scroll to reach the top with a fast movement of 2 fingers.

2. kivy scrolls up as expected

3. My fingers quit the touchpad

4 kivy continue to going up and its okay

5. Before kivy goes down, I do a quick movement on X-axis with 2 fingers, whitch stops the scrolling down, so the idea will be to fake a scroll on X axis maybe ?

 

Do you know how to do that ?

 

 

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[Elliot Garbus]

There Is an event is scrollview, that occurs when scroll touch stops, on_scroll_stop.  Good luck!

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