In a ScrollView, can I run a def if I reach the end of the list in a ScrollView or MDList?

Question

How can I receive the event if I reach the bottom or end of the list

In a ScrollView, can I run a def if I reach the end of the list in a ScrollView or MDList?

App.py

from kivy.lang import Builder
from kivymd.app import MDApp
import kivymd_extensions.akivymd
from kivy.uix.screenmanager import ScreenManager, Screen

img = ["https://ar.anime-slayer.com/wp-content/uploads/2022/04/Ashampoo_Snap_2022.04.11_20h41m49s_005_-215x300.webp", "03.jpg", "13.jpg", "15.jpg", "24.jpg", "28.jpg", "29.jpg", "33.jpg", "34.jpg"]
KV = """

<MyTile@SmartTile>
    size_hint_y: None
    height: "240dp"

ScrollView:
    id: scroll
    MDGridLayout: 
        id: grid 
        cols: 3 
        adaptive_height: True 
        padding: dp(4), dp(4) 
        spacing: dp(4)
        MyTile: 
            source:"https://ar.anime-slayer.com/wp-content/uploads/2022/04/Ashampoo_Snap_2022.04.11_20h41m49s_005_-215x300.webp"

        MyTile: 
            source:"15.jpg"
            
        MyTile: 
            source:"24.jpg"
            
        MyTile: 
            source:"13.jpg"                                 
"""


        
class Test(MDApp):
    def build(self):
        #self.ids.grid.add_widget(SmartTile(source = img[0])) 
        return Builder.load_string(KV)
    
Test().run()

Try adding that functionality that you want to implement with scrolling. — ApuCoder, May 17 '22 at 17:02

score 1 · Answer 1 · answered May 21 '22 at 10:19

You can bind a callback method to the prop. scroll_y or override default method on_scroll_y with the necessary logic which, if not implemented properly, can be unstable.

However adding a Button at the end of your widget tree inside ScrollView and triggering an event once you reach the end can be simple and suitable for your needs.

Here is the implementation of that design.

from kivy.lang import Builder
from kivymd.app import MDApp
from kivy.factory import Factory
import kivymd_extensions.akivymd
from kivy.uix.screenmanager import ScreenManager, Screen


img = ["https://ar.anime-slayer.com/wp-content/uploads/2022/04/Ashampoo_Snap_2022.04.11_20h41m49s_005_-215x300.webp", "03.jpg", "13.jpg", "15.jpg", "24.jpg", "28.jpg", "29.jpg", "33.jpg", "34.jpg"]

KV = """

<MyTile@SmartTile>
    size_hint_y: None
    height: "240dp"

ScrollView:
    id: scroll

    MDBoxLayout:
        orientation: "vertical"
        adaptive_height: True

        MDGridLayout: 
            id: grid 
            cols: 3 
            adaptive_height: True
            padding: dp(4), dp(4) 
            spacing: dp(4)
            MyTile: 
                source:"https://ar.anime-slayer.com/wp-content/uploads/2022/04/Ashampoo_Snap_2022.04.11_20h41m49s_005_-215x300.webp"

            MyTile: 
                source:"15.jpg"
            
            MyTile: 
                source:"24.jpg"
            
            MyTile: 
                source:"13.jpg"
        
        Button:
            size_hint_y: None
            height: dp(25)
            text: "Load more photos"
            on_release: app.add_more_images()



"""


        
class Test(MDApp):
    def build(self):
        return Builder.load_string(KV)
    
    def add_more_images(self, *args):
        grid = self.root.ids.grid
        # Add images from the list.
        for img_src in img:
            tile = Factory.MyTile(source = img_src)
            grid.add_widget(tile)
    
Test().run()

In a ScrollView, can I run a def if I reach the end of the list in a ScrollView or MDList?

1 Answers1