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1. Adrian Cochrane (alcinnz@floss.social)'s status on Thursday, 16-Feb-2023 09:22:42 JST Adrian Cochrane

   Let me talk through my CatTrap layout engine?

   The minimum & natural sizes can be computed in a postorder traversal. A preorder can compute the maximum widths.

   Once I have the min & max widths I can clamp the natural widths to them.

   Once I know the final width I can compute the natural height in a postorder traversal. A preorder traversal can then finalize it within the given bounds.

   That'll give good input to more advanced layout. And yes, I'm not tackling vertical text yet...

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   • Adrian Cochrane (alcinnz@floss.social)'s status on Thursday, 16-Feb-2023 09:45:32 JST Adrian Cochrane

     in reply to

     The trickiest units to support may surprisingly be percentages! Since that has a cyclic data dependency to break.

     During initially computing min size & padding the spec says I should treat the parent as being 0 wide. max & preferred size would be based on the natural width.

     Oh, for autolayout I'd need a postorder traversal to sum fixed/finalized heights.

     ---

     With a minor change to underlying datastructures, I could write accessors for computing min, max, natural, & final width & height!

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   • Adrian Cochrane (alcinnz@floss.social)'s status on Thursday, 16-Feb-2023 12:36:36 JST Adrian Cochrane

     in reply to

     I've just drafted a new CatTrap API, and have just committed it. Now I shouldn't get stuck on implementing this one...

     https://git.argonaut-constellation.org/~alcinnz/cattrap

     This'll definitely be worth a blogpost when I implement it, give webdevs a clearer picture of what these CSS properties do!