ScrollView and Scatter objects...

[Ryan]

Hi,

I was wondering if someone could tell me why adding Scatter objects to a ScrollView object results in the selected object being moved to the end of the list when long clicking on a Scatter object.

To help illustrate what I'm talking about, I've modified the scrollview demo application.

Button objects are now contained in Scatter objects, and the Scatter widgets are added to the ScrollView.

To see the problem, just long click on the any of the buttons... the selected button jumps to the end of the list!

import kivy

kivy.require('1.0.8')

from kivy.app import App

from kivy.core.window import Window

from kivy.uix.button import Button

from kivy.uix.scatter import Scatter

from kivy.uix.scrollview import ScrollView

from kivy.uix.gridlayout import GridLayout

class ScrollViewApp(App):

    def build(self):

        # create a default grid layout with custom width/height

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

                            width=500)

        # when we add children to the grid layout, its size doesn't change at

        # all. we need to ensure that the height will be the minimum required to

        # contain all the childs. (otherwise, we'll child outside the bounding

        # box of the childs)

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

        # add button into that grid

        for i in range(30):

            btn = Button(text=str(i), size=(480, 40),

                         size_hint=(None, None))

            scatter = Scatter(size=btn.size, size_hint=(None, None))

            scatter.add_widget(btn)

            layout.add_widget(scatter)

        # create a scroll view, with a size < size of the grid

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

        root.size = (480, 320)

        root.center = Window.center

        root.add_widget(layout)

        return root

if __name__ == '__main__':

    ScrollViewApp().run()

[Mathieu Virbel]

Hi,

The scatter is a very special object.

By default, it have 'auto_bring_to_front' boolean to True, and then when you touch it, it will remove/readd itself to it's parent.

Swith to False, and you should have what you want.

Mathieu