Slider don't respond when extending FloatLayout

[Petr Marek]

Hello!

I have noticed, that when I write custom layout (extend FloatLayout class), that when I override function on_touch_down in this class, then slider added on this layout not respond. I have touchscreen, and when I drag slider, it is "frozen".

Here is my code:

import kivy 

from kivy.app import App 

from kivy.uix.floatlayout import FloatLayout

from kivy.uix.slider import Slider

class MainApp(App): 

    def build(self):

        layout = MyLayout(size_hint=(0.4,0.2))

        slider = Slider( min=10, max=100) # create and add slider to MyLayout

        layout.add_widget(slider)

        return layout

        

class MyLayout(FloatLayout):

    def __init__(self, **kwargs):

        super(MyLayout, self).__init__(**kwargs)

        

    def on_touch_down(self, touch):

        if self.collide_point(*touch.pos):

            print("hit")

        else:

            print("miss")

            

app = MainApp()

app.run()

When I remove function on_touch_down(), everything works perfectly!

WHY? I need recognize touch event on this layout...So removing function is not solution for me.

Thanks!

[Elliot Garbus]

When you overload the on_touch_down() you are ‘consuming’ the touch.  You need to pass the touch along, so it can bubble to the other widgets.  See: https://kivy.org/doc/stable/api-kivy.uix.widget.html?highlight=widget#widget-touch-event-bubbling

 

import kivy
from kivy.app import App
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.slider import Slider


class MainApp(App):
    def build(self):
        layout = MyLayout(size_hint=(0.4, 0.2

))
        slider = Slider(min=10, max=100)  # create and add slider to MyLayout
        layout.add_widget(slider)
        return layout

class MyLayout(FloatLayout):
    def __init__(self, **kwargs):
        super(MyLayout, self).__init__(**kwargs)

    def on_touch_down(self, touch):
        if self.collide_point(*touch.pos):
            print("hit")
        else:
            print("miss"

)
        return super().on_touch_down(touch)

app = MainApp()
app.run()

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