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Use logical coordinates for the UI layout #8426

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Use logical coordinates for the UI layout #8426

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ickshonpe
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@ickshonpe ickshonpe commented Apr 17, 2023 •
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Objective

It would be a lot more efficient and less complicated if the UI layout systems only used logical coordinates.

Solution

Just use logical coordinates everywhere except where we can't.
Change flex_node_system and FlexSurface to use logical coordinates.

Changelog

  • Modified flex_node_system and FlexSurface to use logical coordinates.
  • Changed the size paramter of update_window to a Vec2 and renamed it to logical_size.

Migration Guide

@ickshonpe
changes:
21f3304 
* Added a field `logical_size` to `LayoutContext` and changed its `min_size` and `max_size` fields to use logical sizes.
* Modified `flex_node_system` and `FlexSurface` to use logical coordinates.
* Changed the size paramter of `update_window` to a `Vec2` and renamed it to `logical_size`.
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cargo fmt
e2a8123
@alice-i-cecile alice-i-cecile added A-UI Graphical user interfaces, styles, layouts, and widgets C-Code-Quality A section of code that is hard to understand or change labels Apr 17, 2023
@ickshonpe ickshonpe changed the title use logical coordinates for the layout Use logical coordinates for the UI layout Apr 17, 2023
@alice-i-cecile alice-i-cecile added this to the 0.11 milestone Apr 17, 2023
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ickshonpe commented Apr 17, 2023 •
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cargo run --profile stress-test --features trace_tracy --example many_buttons -- no-text
logical_layout

Not as big an improvement as I hoped for, but I'll take it.

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Yeah IMO the primary wins here are code quality. Can you fix up merge conflicts?

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Yeah IMO the primary wins here are code quality. Can you fix up merge conflicts?

yes, will do.

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Hmm... we ideally want to use physical coordinates in Taffy for rounding purposes (although this may not be critical for game UIs). I've been considering added a scale_factor configuration field to Taffy such that it takes logical units in and outputs physical units. Would that work with this approach?

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ickshonpe commented Apr 17, 2023 •
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Hmm... we ideally want to use physical coordinates in Taffy for rounding purposes (although this may not be critical for game UIs). I've been considering added a scale_factor configuration field to Taffy such that it takes logical units in and outputs physical units. Would that work with this approach?

Yeah, I've been looking for rounding issues but I haven't seen anything so far. If Taffy supported scale factor that would probably be ideal though. We'd just convert the output coordinates back immediately when we update the node sizes and transforms etc.

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I think this one probably ought to block on DioxusLabs/taffy#478

@alice-i-cecile alice-i-cecile removed this from the 0.11 milestone Jun 19, 2023
@alice-i-cecile alice-i-cecile added the S-Blocked This cannot move forward until something else changes label Jun 19, 2023
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Yep, I'm not sure about this one at all now.

#8720 fixes a lot of the same problems, and doesn't have any of the possible negatives that this has.

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I'm going to close this in favor of #8720; we can revisit it later if y'all change your minds :)

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