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# Objective `ui_stack_system` generates a tree of `StackingContexts` which it then flattens to get the `UiStack`. But there's no need to construct a new tree. We can query for nodes with a global `ZIndex`, add those nodes to the root nodes list and then build the `UiStack` from a walk of the existing layout tree, ignoring any branches that have a global `Zindex`. Fixes #9877 ## Solution Split the `ZIndex` enum into two separate components, `ZIndex` and `GlobalZIndex` Query for nodes with a `GlobalZIndex`, add those nodes to the root nodes list and then build the `UiStack` from a walk of the existing layout tree, filtering branches by `Without<GlobalZIndex>` so we don't revisit nodes. ``` cargo run --profile stress-test --features trace_tracy --example many_buttons ``` <img width="672" alt="ui-stack-system-walk-split-enum" src="https://github.com/bevyengine/bevy/assets/27962798/11e357a5-477f-4804-8ada-c4527c009421"> (Yellow is this PR, red is main) --- ## Changelog `Zindex` * The `ZIndex` enum has been split into two separate components `ZIndex` (which replaces `ZIndex::Local`) and `GlobalZIndex` (which replaces `ZIndex::Global`). An entity can have both a `ZIndex` and `GlobalZIndex`, in comparisons `ZIndex` breaks ties if two `GlobalZIndex` values are equal. `ui_stack_system` * Instead of generating a tree of `StackingContexts`, query for nodes with a `GlobalZIndex`, add those nodes to the root nodes list and then build the `UiStack` from a walk of the existing layout tree, filtering branches by `Without<GlobalZIndex` so we don't revisit nodes. ## Migration Guide The `ZIndex` enum has been split into two separate components `ZIndex` (which replaces `ZIndex::Local`) and `GlobalZIndex` (which replaces `ZIndex::Global`). An entity can have both a `ZIndex` and `GlobalZIndex`, in comparisons `ZIndex` breaks ties if two `GlobalZindex` values are equal. --------- Co-authored-by: Gabriel Bourgeois <gabriel.bourgeoisv4si@gmail.com> Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com> Co-authored-by: UkoeHB <37489173+UkoeHB@users.noreply.github.com> |
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Bevy UI
