How to make a block only be allowed at the top level on pages?

[xavortm]

I have a block named "Section" and I want that to only be allowed as a top-level block or as part of a group. I want it to only show up on the "Pages" as well. The limitation is that nesting it will cause left/right paddings that are unwanted.

The block wraps most patterns too and I don't want the users to be able to add patterns inside the "Section" block. So basically:

1. Can I have block/section only be added at top level
2. Can I have the block/section only be added for pages
3. Can I have patterns blocked from being added if a user tries to add them in a block/section block?

For 3), it can be custom validation too.

[fabiankaegy]

Hey @xavortm 👋

You can ensure that a block only is available at the top level by setting the parent property in your block registration object to [ 'core/post-content' ]. That will only make the block show up at the top level.

As far as post types go there isn't a clear API for this. Instead, you will need to manually maintain an allow/disallow list for post types.

For the third item I don't think we have enough controls over this 🤔