⚡ Bolt: [performance improvement] Replace ListView with CustomScrollView for log virtualization - #328
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Reviewer's GuideRefactors SosActivityLogScreen to use a CustomScrollView + SliverList-based layout instead of a ListView with a nested Column, enabling proper list virtualization and making the Riverpod AsyncValue branches return sliver-friendly widgets. Flow diagram for SosActivityLogScreen scrollable layout refactorflowchart TD
subgraph SosActivityLogScreen_body[CustomScrollView layout]
CS[CustomScrollView]
CS --> SP1[SliverPadding top]
SP1 --> SL_static[SliverList staticContent]
CS --> SP2[SliverPadding bottom]
SP2 --> AV_history[AsyncValue history.when]
subgraph AsyncValue_history_branches[history.when branches]
AV_history -->|data items isEmpty| SBA_empty[SliverToBoxAdapter emptyText]
AV_history -->|data items nonEmpty| SL_history[SliverList.builder historyCards]
AV_history -->|loading| SBA_loading[SliverToBoxAdapter CircularProgressIndicator]
AV_history -->|error| SBA_error[SliverToBoxAdapter errorText]
end
end
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💡 What: Replaced the standard
ListViewand nestedColumninSosActivityLogScreenwith aCustomScrollViewandSliverList.builder. Also ensured Riverpod'sAsyncValuedata states properly yield Sliver-compatible widgets.🎯 Why: Rendering a potentially unbounded list (the SOS activity history) inside a
Columnnested within aListViewbreaks Flutter's list virtualization. This forces the framework to synchronously build every history item when the screen opens, resulting in O(n) layout and paint times. By transitioning to Slivers, Flutter now only builds the widgets lazily as they scroll into view (O(1) active rendering).📊 Impact: Reduces time to first frame (TTFF) when opening the log screen for users with extensive SOS histories and scales safely without causing jank or memory spikes.
🔬 Measurement: Verified that the UI identical. Run the app, populate several mock SOS incidents, and scroll through the log screen. DevTools Timeline will show fewer widget builds in the initial render frame.
PR created automatically by Jules for task 15264095565983698682 started by @NITISH-R-G
Summary by Sourcery
Improve the SOS activity log’s rendering performance and keep pull request dashboard workflows from configuring production deployment environments.
Enhancements:
CI: