How to identify which controls are currently visible within ScrollContainer?

usual_efficiency_410

Suppose I have a ScrollContainer containing a GridContainer with 100 buttons, displaying only 10 buttons at a time. How can I determine which buttons are visible within the ScrollContainer? Is there a way for each button to notify me when it becomes visible, similar to the VisibleOnScreenNotifier nodes but for controls?

xyz

usual_efficiency_410 Why do you need to know which buttons are visible?

Jesusemora

usual_efficiency_410 no (I did the research, queue_draw is run at the start and all nodes are visible but are clipped by the scrollcontainer), but you can get the CanvasItem position with something like:
get_global_transform().origin
and check if the node is within a certain range, something like:
if posx < 50 and posx > 20

usual_efficiency_410

xyz I'm working on a level selector where each button displays a preview of a level. However, generating 100 previews simultaneously is slow, especially since it's in 3D. Therefore, I want to determine which buttons are currently visible on the screen and only create the preview for those.

Jesusemora

DaveTheCoder
Visibility_changed only triggers when visible is changed or queue_draw is called. Nodes in a scrollcontainer are visible, they are just clipped.

DaveTheCoder

Jesusemora

I didn't read your post carefully. I'll remove my faulty reply.

kuligs2

Maybe do some maths, Get the size of the scrollbox, then know the size of one button + margins, then calculate based on scroll position if them buttons gets visible or not

xyz

Yeah, make something like your own visibility management system for this. Shouldn't be too hard to do.