UI does not update in sync with window resizes #14255
Labels
A-UI
Graphical user interfaces, styles, layouts, and widgets
A-Windowing
Platform-agnostic interface layer to run your app in
C-Bug
An unexpected or incorrect behavior
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UkoeHB
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C-Bug
alice-i-cecile
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A-Windowing
github-merge-queue bot
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Aug 4, 2024
) # Objective Fixes #14277. May also fix #14255, needs verification. ## Solution Explicitly order `CameraUpdateSystem` before `UiSystem::Prepare`, so that when the window resizes, `camera_system` will update the `Camera`'s viewport size before `ui_layout_system` also reacts to the window resize and tries to read the new `Camera` viewport size to set UI node sizes accordingly. ## Testing I tested that explicitly ordering `CameraUpdateSystem` _after_ triggers the buggy behavior, and explicitly ordering it _before_ does not trigger the buggy behavior or crash the app (which also demonstrates that the system sets are ambiguous). --- ## Migration Guide `CameraUpdateSystem` is now explicitly ordered before `UiSystem::Prepare` instead of being ambiguous with it.
mockersf
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Sep 5, 2024
) Fixes #14277. May also fix #14255, needs verification. Explicitly order `CameraUpdateSystem` before `UiSystem::Prepare`, so that when the window resizes, `camera_system` will update the `Camera`'s viewport size before `ui_layout_system` also reacts to the window resize and tries to read the new `Camera` viewport size to set UI node sizes accordingly. I tested that explicitly ordering `CameraUpdateSystem` _after_ triggers the buggy behavior, and explicitly ordering it _before_ does not trigger the buggy behavior or crash the app (which also demonstrates that the system sets are ambiguous). --- `CameraUpdateSystem` is now explicitly ordered before `UiSystem::Prepare` instead of being ambiguous with it.
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Bevy version
v0.14.0
[Optional] Relevant system information
MacOS v12.5.1
What you did
cargo run --example ui.What went wrong
The UI jitters because it reacts to window resizes one frame late.
Comments
I tested this on v0.13.0 and it was smooth, so this is a regression.
See #14277 for a related issue.
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