Nested ScrollView

[ElliotG]

1. I'm delighted to announce the updated implementation of ScrollView is complete.
   I have more work to do prior to a PR - but welcome any feedback. I also want to thank all of the kivy devs that have contributed to ScrollView before me. code and demonstrations are available on GitHub:
2. Nested Scrolling Behavior ------------------------- The ScrollView automatically detects the scrolling configuration and applies appropriate behavior: Orthogonal Scrolling (outer and inner scroll in different directions):

   • Touch scrolling: Each ScrollView handles touches in its scroll direction
     • Mouse wheel: Scrolls innermost ScrollView if it can handle the direction
       • Example: Vertical outer + Horizontal inner

   Parallel Scrolling (outer and inner scroll in the same direction):

   • Touch scrolling: Uses web-style boundary delegation (see below)
     • Mouse wheel: Scrolls innermost ScrollView, no boundary delegation
       • Scrollbar: Does not propagate scroll to the other ScrollView
       • Example: Vertical outer + Vertical inner

   Mixed Scrolling (outer scrolls XY, inner scrolls single axis, or vice versa):

   • Shared axis: Uses web-style boundary delegation
     • Exclusive axes: Immediate delegation or inner-only scrolling
       • Mouse wheel: Scrolls innermost ScrollView if it can handle the direction
       • Example: XY outer + Horizontal inner

[ElliotG]

Here is an image of one of the demo apps.  The app demonstrates 12 scrollviews, nested in an XY scrollview.

[Chisoul Munthali]

Hi Elliot,

That is absolutely fantastic news, seriously impressive work getting the updated ScrollView implementation completed!

I commend your dedication to tackling such a core component. It’s also wonderful that you acknowledged the efforts of the prior Kivy developers; that community spirit is invaluable.

Keep up the strong momentum as you prepare for the PR!

Best regards,

Chisoul

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