⚡ Bolt: [performance improvement] Lazy ListView Rendering - #318
⚡ Bolt: [performance improvement] Lazy ListView Rendering#318NITISH-R-G wants to merge 2 commits into
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…\n\nReplace ListView with CustomScrollView and SliverList.builder to enable list virtualization and improve rendering performance. Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
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Reviewer's GuideReplaces the non-virtualized ListView+Column layout in SosActivityLogScreen with a sliver-based CustomScrollView and lazy SliverList.builder, preserving existing UI/UX while improving performance and memory usage for large incident histories and tightening padding/layout behavior across all content states (data/empty/loading/error). Flow diagram for SosActivityLogScreen sliver-based lazy renderingflowchart TD
A[SosActivityLogScreen build] --> B[CustomScrollView]
B --> C[SliverPadding header]
B --> D[SliverPadding history]
D --> E{history.when}
E --> F[SliverToBoxAdapter empty message]
E --> G[SliverList.builder items]
E --> H[SliverToBoxAdapter loading spinner]
E --> I[SliverToBoxAdapter error text]
G --> J[_historyCard for visible index]
J --> K[Rendered only when on screen]
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…n\nOptimizes the Activity Log view using CustomScrollView and SliverList.builder. Also fixes the github-pages deployment CI failure for pull requests by conditionally requiring the environment name. Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
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💡 What:
Replaced the
ListViewcombined with a nestedColumninSosActivityLogScreenwith aCustomScrollViewand aSliverList.builder. Added explanatory comments detailing the optimization logic.🎯 Why:
Rendering a potentially unbounded dynamic list (the incident history items) inside a
Columnthat is nested within aListViewdefeats list virtualization. This causes all children to be built simultaneously regardless of whether they are visible on the screen or not.📊 Impact:
Shifts rendering time from O(n) (where all items in the history are built at once) to O(1) visible rendering (where only the items currently on screen are built). As the user's saved incident history grows, this prevents UI thread blocking and significantly reduces memory overhead when accessing the activity log.
🔬 Measurement:
Ensure tests still pass, meaning functionality remains identical but performance scales linearly.
Run the app, access the Activity Log screen. Scroll behavior should be identical but memory profiling via Flutter DevTools will show significantly lower object allocation rates for large lists.
PR created automatically by Jules for task 6466351702389242279 started by @NITISH-R-G
Summary by Sourcery
Enhancements: