i everyone, I'm struggling with a touch propagation issue in Kivy. I have a main vertical ScrollView containing several horizontal RecycleViews (categories, features, etc.) and a final vertical RecycleView for a "popular" list. The issue:

Mk2 on the beatz

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Mar 23, 2026, 11:14:01 AM (11 days ago) Mar 23

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from kivy.app import App
from kivy.lang import Builder
from kivy.uix.recycleview import RecycleView
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import StringProperty
from kivy.clock import Clock

class CardHorizontal(BoxLayout):
    title = StringProperty('')

class CardVertical(BoxLayout):
    title = StringProperty('')

KV = '''
<CardHorizontal>:
    orientation: 'vertical'
    size_hint_x: None
    width: 140
    padding: 10
    canvas.before:
        Color:
            rgba: 0.2, 0.2, 0.2, 1
        RoundedRectangle:
            size: self.size
            pos: self.pos
            radius: [10]
    Label:
        text: root.title

<CardVertical>:
    size_hint_y: None
    height: 80
    padding: 10
    canvas.before:
        Color:
            rgba: 0.15, 0.15, 0.15, 1
        Rectangle:
            size: self.size
            pos: self.pos
    Label:
        text: root.title

<HorizontalRV@RecycleView>:
    do_scroll_x: True
    do_scroll_y: False
    size_hint_y: None
    height: 150
    viewclass: 'CardHorizontal'
    scroll_timeout: 100
    RecycleBoxLayout:
        default_size: None, None
        default_size_hint: None, 1
        size_hint_x: None
        width: self.minimum_width
        orientation: 'horizontal'
        spacing: 10
        padding: 10

BoxLayout:
    orientation: 'vertical'
    canvas.before:
        Color:
            rgba: 0.05, 0.05, 0.05, 1
        Rectangle:
            size: self.size
            pos: self.pos

    Label:
        text: "TOUT EST VISIBLE ICI"
        size_hint_y: None
        height: 50
        bold: True

    # --- LE SCROLL PRINCIPAL ---
    ScrollView:
        id: main_scroll
        on_scroll_y: app.check_infinite_scroll(self)

        BoxLayout:
            orientation: 'vertical'
            size_hint_y: None
            height: self.minimum_height
            spacing: 20
            padding: 10

            # 1. Categories
            Label:
                text: "Catégories"
                size_hint_y: None
                height: 30
            HorizontalRV:
                id: rv_cats
                height: 60

            # 2. Features
            Label:
                text: "Features"
                size_hint_y: None
                height: 30
            HorizontalRV:
                id: rv_features
                height: 180

            # 3. Recommandés
            Label:
                text: "Recommandés"
                size_hint_y: None
                height: 30
            HorizontalRV:
                id: rv_reco
                height: 120

            # 4. Populaires (RECYCLEVIEW)
            Label:
                text: "Populaires (Infini)"
                size_hint_y: None
                height: 30
            
            RecycleView:
                id: list_populaire
                viewclass: 'CardVertical'
                size_hint_y: None
                # TRÈS IMPORTANT : On lie la hauteur à son contenu interne
                height: rv_layout.minimum_height
                do_scroll_y: False # On laisse le ScrollView principal scroller
                
                RecycleBoxLayout:
                    id: rv_layout
                    default_size: None, 80
                    default_size_hint: 1, None
                    size_hint_y: None
                    height: self.minimum_height
                    orientation: 'vertical'
                    spacing: 5
'''

class TestApp(App):
    def build(self):
        return Builder.load_string(KV)

    def on_start(self):
        # Données horizontales
        self.root.ids.rv_cats.data = [{'title': f'Cat {i}'} for i in range(15)]
        self.root.ids.rv_features.data = [{'title': f'Feature {i}'} for i in range(10)]
        self.root.ids.rv_reco.data = [{'title': f'Reco {i}'} for i in range(10)]

        # Données verticales
        self.load_more_items()

    def load_more_items(self, *args):
        rv = self.root.ids.list_populaire
        current_data = rv.data
        new_items = [{'title': f"Populaire #{len(current_data) + i}"} for i in range(15)]
        rv.data.extend(new_items)
        rv.refresh_from_data()

    def check_infinite_scroll(self, scrollview):
        # On vérifie le scroll du ScrollView principal
        if scrollview.scroll_y <= 0.05:
            Clock.schedule_once(self.load_more_items, 0.2)

if __name__ == '__main__':
    TestApp().run()

ElliotG

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Mar 23, 2026, 11:22:18 AM (11 days ago) Mar 23

to Kivy users support

Unfortunately Nested ScrollView does not work on V2.3.1. There is an updated on the master branch that does support nested scrolling. https://github.com/kivy/kivy/blob/master/kivy/uix/scrollview.py

You can download the file and replace the current file in your venv. It should be something like:
.venv/Lib/site-packages/kivy/uix/scrollview.py

Tomek CEDRO

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Mar 23, 2026, 3:39:30 PM (11 days ago) Mar 23

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time for 2.3.2 release? :-)

--
CeDeROM, SQ7MHZ, http://www.tomek.cedro.info

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elli...@cox.net

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Mar 23, 2026, 8:02:05 PM (11 days ago) Mar 23

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I had a brief exchange with a maintainer on the Kivy Discord about the next release. This was in regard to a different issue. His response, "I don't think there will be another version of Kivy 2"

The master branch has already been moved over to SDL3 (from SDL2).

From: kivy-...@googlegroups.com <kivy-...@googlegroups.com> on behalf of Tomek CEDRO <to...@cedro.info>
Sent: Monday, March 23, 2026 12:39 PM
To: kivy-...@googlegroups.com <kivy-...@googlegroups.com>
Subject: Re: [kivy-users] Re: i everyone, I'm struggling with a touch propagation issue in Kivy. I have a main vertical ScrollView containing several horizontal RecycleViews (categories, features, etc.) and a final vertical RecycleView for a "popular" list. The...

To view this discussion visit https://groups.google.com/d/msgid/kivy-users/CAFYkXjksNwmYmTi6s1-W4uAcmyZB6U%2BhHemaRdeV40d4xje7xQ%40mail.gmail.com.

Tomek CEDRO

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Mar 23, 2026, 8:18:01 PM (11 days ago) Mar 23

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Thank you Elliot for the info :-)

--
CeDeROM, SQ7MHZ, http://www.tomek.cedro.info

> To view this discussion visit https://groups.google.com/d/msgid/kivy-users/BN8PR05MB6420EC0B8298B796096B8B4BFD4BA%40BN8PR05MB6420.namprd05.prod.outlook.com.

Message has been deleted

pedro h

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Mar 25, 2026, 3:23:57 AM (10 days ago) Mar 25

to Kivy users support

Hey deloinfi,

Give this code a try! I hope it helps with your scrolling issue.

It uses a FloatLayout as the root to separate the header from the main list, which avoids the touch propagation conflicts you usually get with nested ScrollViews in V2.3.1.

Best regards, Pedro

from kivy.app import App

from kivy.lang import Builder
from kivy.uix.recycleview import RecycleView
from kivy.uix.boxlayout import BoxLayout

from kivy.uix.floatlayout import FloatLayout

from kivy.properties import StringProperty
from kivy.clock import Clock

class MainRoot(FloatLayout):
def on_touch_move(self, touch):
rv, header = self.ids.list_populaire, self.ids.header_area
if header.collide_point(*touch.pos) and abs(touch.dy) > abs(touch.dx):
rv.scroll_y = max(0, min(1, rv.scroll_y - (touch.dy / 500)))
return True
return super().on_touch_move(touch)

class CardHorizontal(BoxLayout):
title = StringProperty('')

class CardVertical(BoxLayout):
title = StringProperty('')

KV = '''
<CardHorizontal>:
orientation: 'vertical'
size_hint_x: None
width: 140
padding: 10
canvas.before:
Color:
rgba: 0.2, 0.2, 0.2, 1
RoundedRectangle:
size: self.size
pos: self.pos
radius: [10]
Label:
text: root.title

input_transparent: True

<CardVertical>:
size_hint_y: None
height: 80
padding: 10
canvas.before:
Color:
rgba: 0.15, 0.15, 0.15, 1
Rectangle:
size: self.size
pos: self.pos
Label:
text: root.title

MainRoot:

canvas.before:
Color:
rgba: 0.05, 0.05, 0.05, 1
Rectangle:
size: self.size
pos: self.pos

RecycleView:
id: list_populaire
viewclass: 'CardVertical'

on_scroll_y: app.on_scroll(self)

RecycleBoxLayout:
id: rv_layout
default_size: None, 80
default_size_hint: 1, None
size_hint_y: None
height: self.minimum_height
orientation: 'vertical'
spacing: 5

padding: [10, 590, 10, 10]
BoxLayout:
id: header_area
orientation: 'vertical'
size_hint: 1, None
height: 500
y: root.height - self.height - 80
spacing: 10
padding: 10
canvas.before:
Color:

rgba: 0.05, 0.05, 0.05, 1
Rectangle:
size: self.size
pos: self.pos
Label:

text: "Categories"

size_hint_y: None
height: 30
RecycleView:

id: rv_cats
viewclass: 'CardHorizontal'
size_hint_y: None
height: 40
do_scroll_x: True
do_scroll_y: False

RecycleBoxLayout:
default_size: None, None
default_size_hint: None, 1
size_hint_x: None
width: self.minimum_width
orientation: 'horizontal'
spacing: 10

Label:
text: "Features"
size_hint_y: None
height: 30

RecycleView:
id: rv_features
viewclass: 'CardHorizontal'
size_hint_y: None
height: 160
do_scroll_x: True
do_scroll_y: False

RecycleBoxLayout:
default_size: None, None
default_size_hint: None, 1
size_hint_x: None
width: self.minimum_width
orientation: 'horizontal'
spacing: 10

Label:
text: "Recommended"

size_hint_y: None
height: 30
RecycleView:

id: rv_reco
viewclass: 'CardHorizontal'
size_hint_y: None
height: 100
do_scroll_x: True
do_scroll_y: False

RecycleBoxLayout:
default_size: None, None
default_size_hint: None, 1
size_hint_x: None
width: self.minimum_width
orientation: 'horizontal'
spacing: 10

Label:
text: "Popular (Infinite)"
size_hint_y: None
height: 30
bold: True

Label:
text: "TOUT EST VISIBLE ICI"

size_hint: 1, None
height: 50
pos_hint: {'top': 1}
bold: True
canvas.before:
Color:
rgba: 0.08, 0.08, 0.08, 1

Rectangle:
size: self.size
pos: self.pos

'''

class TestApp(App):
is_loading = False

def build(self): return Builder.load_string(KV)
def on_start(self):

self.root.ids.rv_cats.data = [{'title': f'Cat {i}'} for i in range(15)]
self.root.ids.rv_features.data = [{'title': f'Feature {i}'} for i in range(10)]
self.root.ids.rv_reco.data = [{'title': f'Reco {i}'} for i in range(10)]

self.load_more_items()
def on_scroll(self, rv):
if rv.scroll_y <= 0.1 and not self.is_loading:
self.is_loading = True
self.load_more_items()
header = self.root.ids.header_area
scroll_px = (1.0 - rv.scroll_y) * (rv.children[0].height - rv.height)
header.y = self.root.height - 500 - 80 + min(500, scroll_px)

def load_more_items(self, *args):
rv = self.root.ids.list_populaire

rv.data.extend([{'title': f"Popular #{len(rv.data) + i}"} for i in range(15)])
rv.refresh_from_data()
Clock.schedule_once(lambda dt: setattr(self, 'is_loading', False), 0.5)

if __name__ == '__main__':
TestApp().run()

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i everyone, I'm struggling with a touch propagation issue in Kivy. I have a main vertical ScrollView containing several horizontal RecycleViews (categories, features, etc.) and a final vertical RecycleView for a "popular" list. The issue: > When I

Mk2 on the beatz

ElliotG

Tomek CEDRO

elli...@cox.net

Tomek CEDRO

pedro h