Robust Scrolling Example

[tim-blackbird]

Objective

A more robust scrolling example that doesn't require Pickable { should_block_lower: false, .. } or Pickable::IGNORE, and properly handles nested scrolling nodes.

The current example shows nested scrolling, but this is only functional because the parent scrolls along a different axis than the children.

Solution

Instead of only scrolling the top node that is found in the HoverMap we trigger the OnScroll event on it.
This event then propagates up the hierarchy until any scrolling node that has room to scroll along that axis consumes the event.

The now redundant Pickable components were removed from the example.
The “Nested Scrolling Lists” portion was adjusted to show the new reliable nested scrolling.

Testing

Check out the example. It should work just as it did before.

[viridia]

Looks good. This should also play well with scrollbars (I have a prototype).