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⚡ Bolt: [performance improvement] Replace ListView with CustomScrollView for log virtualization - #328

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⚡ Bolt: [performance improvement] Replace ListView with CustomScrollView for log virtualization#328
NITISH-R-G wants to merge 2 commits into
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bolt/virtualize-sos-log-list-15264095565983698682

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@NITISH-R-G

@NITISH-R-G NITISH-R-G commented Aug 20, 2026

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💡 What: Replaced the standard ListView and nested Column in SosActivityLogScreen with a CustomScrollView and SliverList.builder. Also ensured Riverpod's AsyncValue data states properly yield Sliver-compatible widgets.
🎯 Why: Rendering a potentially unbounded list (the SOS activity history) inside a Column nested within a ListView breaks 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:

  • Virtualize SOS activity history rendering with sliver-based scrolling to improve initial load performance and scalability for large histories.

CI:

  • Prevent pull request workflow runs from targeting the GitHub Pages deployment environment.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
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Seems you are using me but didn't get OPENAI_API_KEY seted in Variables/Secrets for this repo. you could follow readme for more information

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Reviewer's Guide

Refactors 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 refactor

flowchart 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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File-Level Changes

Change Details Files
Replace ListView/Column layout with a CustomScrollView and top SliverList for static header and current-session content while preserving existing UI structure and padding.
  • Swap the ListView body for a CustomScrollView with slivers to host the entire screen content.
  • Wrap the static banner, optional current-session section, and section title widgets in a SliverPadding containing a SliverList with a SliverChildListDelegate.
  • Adjust padding so the top section uses top padding only, leaving bottom padding to the history section below.
lib/ui/sos_activity_log_screen.dart
Convert Riverpod AsyncValue-driven history content into sliver-compatible widgets with lazy item building for the activity list.
  • Wrap the history.when(...) result in a SliverPadding to control horizontal and bottom spacing.
  • Change the data branch from building a Column of all history cards to returning a SliverList.builder that lazily builds each history item.
  • Update the empty, loading, and error states to return SliverToBoxAdapter wrappers so they can be composed inside CustomScrollView slivers.
lib/ui/sos_activity_log_screen.dart

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Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

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Seems you are using me but didn't get OPENAI_API_KEY seted in Variables/Secrets for this repo. you could follow readme for more information

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