feat!: rebuild the carousel as 4.0.0 - #70
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- FlutterCarousel and ExpandableCarousel on one engine, with grouped parameters, one FlutterCarouselController and an exact change reason (timed, manual, controller, keyboard). - Ten composable effects, lifecycle-aware autoplay with per-item intervals, repaint-only indicators with tappable labelled dots, keyboard navigation, screen-reader semantics, and flush edges (#58). - widgets.dart only, on a Flutter 3.47 floor; a regression test for every verified 3.1.1 defect; README, MIGRATION and CHANGELOG for 4.0.
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Included review availability: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughVersion 4.0 replaces the previous carousel widgets and options API with list-backed and builder-backed widgets that use a shared engine. The package adds controller, autoplay, sizing, effects, indicators, keyboard navigation, and accessibility APIs. Documentation, package requirements, configuration, and tests are updated. ChangesCarousel 4.0
Priority: ➖ Normal Estimated code review effort: 5 (Critical) | ~120 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant FlutterCarouselController
participant CarouselEngine
participant PageController
participant AutoPlayDriver
FlutterCarouselController->>CarouselEngine: Send navigation request through CarouselBinding
CarouselEngine->>PageController: Animate or jump to target page
PageController->>CarouselEngine: Report scroll position and settled page
AutoPlayDriver->>CarouselEngine: Invoke onTick when timer expires
Merge Risk: 🟡 Moderate · up to Merging this package layer alone can create a 4.0.0 release with an incompatible example, and changing edge alignment can leave an edge slide mispositioned. Do not release this intermediate tree; establish a compatible release tree first. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to The breaking 4.0 release needs coordinated rollout. Merging this package layer alone could publish it while the repository’s example still uses removed APIs. No new security-boundary violation was established, but the release sequence is not enforced by the repository workflows. Retained concerns
Security review detailsSecurity Blast Radius
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Hardening Proposals
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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nixrajput
added this pull request to stack #74
September 28, 2026 05:42
This was referenced Sep 28, 2026
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Actionable comments posted: 4
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @lib/src/engine/carousel_engine.dart:
- Line 274: Update the `edgeAlignment` change handling so switching from `flush`
to `center` recentres the current item on the page grid instead of leaving it at
the flush offset. Extend or replace `_settleFlush` to settle according to the
new alignment, while preserving flush-offset settling when the new alignment is
`flush`.
Review comments at @lib/src/indicators/indicator_view.dart:
- Around line 87-89: Update _DotsPainter to snapshot the relevant geometry
fields when it is created and compare those snapshots in shouldRepaint alongside
the existing indicator and view checks. Add a test that toggles reverse with the
default const CarouselIndicator and verifies the painted dot position changes.
Review comments at @lib/src/indicators/slide_indicator_geometry.dart:
- Around line 34-48: Clamp finite-carousel positions to the valid range before
deriving indicator geometry. In SlideIndicatorGeometry, use the clamped position
for nearest, from, and progress while preserving the raw position for infinite
carousels and empty item sets.
Review comments at @pubspec.yaml:
- Line 3: Update the release configuration around the version declaration so
version 4.0.0 cannot be tagged or published while
example/lib/views/standard.dart still uses the removed FlutterCarouselOptions
API; allow release only once the example is updated to the current API.
After applying the fix, consider running `coderabbit review --agent` for local
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⛔ Files ignored due to path filters (1)
assets/logo.svgis excluded by!**/*.svg
📒 Files selected for processing (75)
.coderabbit.yaml.gitattributes.metadataCHANGELOG.mdCODE_OF_CONDUCT.mdLICENSEMIGRATION.mdREADME.mdanalysis_options.yamllib/flutter_carousel_widget.dartlib/src/_expandable_carousel_widget.dartlib/src/_flutter_carousel_widget.dartlib/src/a11y/carousel_actions.dartlib/src/auto_play/auto_play_driver.dartlib/src/auto_play/carousel_auto_play.dartlib/src/carousel_controller/expandable_carousel_controller.dartlib/src/carousel_controller/flutter_carousel_controller.dartlib/src/carousel_options/base_carousel_options.dartlib/src/carousel_options/expandable_carousel_options.dartlib/src/carousel_options/flutter_carousel_options.dartlib/src/carousel_state/expandable_carousel_state.dartlib/src/carousel_state/flutter_carousel_state.dartlib/src/components/overflow_page.dartlib/src/components/size_reporting_widget.dartlib/src/controller/flutter_carousel_controller.dartlib/src/effects/carousel_effect.dartlib/src/effects/carousel_item_position.dartlib/src/effects/presets.dartlib/src/engine/carousel_config.dartlib/src/engine/carousel_engine.dartlib/src/engine/infinite_index.dartlib/src/engine/reason_tracker.dartlib/src/engine/size_reporter.dartlib/src/engine/sizing.dartlib/src/enums/carousel_page_changed_reason.dartlib/src/enums/center_page_enlarge_strategy.dartlib/src/expandable_carousel.dartlib/src/flutter_carousel.dartlib/src/indicators/carousel_indicator.dartlib/src/indicators/circular_slide_indicator.dartlib/src/indicators/circular_static_indicator.dartlib/src/indicators/circular_wave_indicator.dartlib/src/indicators/circular_wave_slide_indicator.dartlib/src/indicators/indicator_view.dartlib/src/indicators/sequential_fill_indicator.dartlib/src/indicators/slide_indicator.dartlib/src/indicators/slide_indicator_geometry.dartlib/src/indicators/slide_indicator_options.dartlib/src/indicators/slide_indicator_style.dartlib/src/physics/carousel_snap_physics.dartlib/src/typedefs/widget_builder.dartlib/src/types.dartlib/src/utils/flutter_carousel_utils.dartpubspec.yamltest/a11y_test.darttest/architecture_test.darttest/auto_play_test.darttest/config_test.darttest/controller_test.darttest/edge_alignment_test.darttest/effects_test.darttest/engine/infinite_index_test.darttest/engine/reason_tracker_test.darttest/expandable_carousel_test.darttest/flutter_carousel_test.darttest/flutter_test_config.darttest/helpers.darttest/indicators/geometry_test.darttest/indicators/indicator_view_test.darttest/integration_test.darttest/matrix_test.darttest/readme_snippets.darttest/readme_test.darttest/unit_test.darttest/widget_test.dart
💤 Files with no reviewable changes (20)
- lib/src/enums/carousel_page_changed_reason.dart
- lib/src/enums/center_page_enlarge_strategy.dart
- test/widget_test.dart
- lib/src/utils/flutter_carousel_utils.dart
- lib/src/typedefs/widget_builder.dart
- test/unit_test.dart
- test/integration_test.dart
- lib/src/carousel_state/flutter_carousel_state.dart
- lib/src/indicators/slide_indicator_options.dart
- lib/src/_flutter_carousel_widget.dart
- lib/src/components/size_reporting_widget.dart
- lib/src/components/overflow_page.dart
- lib/src/carousel_options/expandable_carousel_options.dart
- lib/src/_expandable_carousel_widget.dart
- lib/src/carousel_state/expandable_carousel_state.dart
- lib/src/carousel_options/flutter_carousel_options.dart
- lib/src/carousel_options/base_carousel_options.dart
- lib/src/carousel_controller/expandable_carousel_controller.dart
- lib/src/carousel_controller/flutter_carousel_controller.dart
- lib/src/indicators/circular_wave_slide_indicator.dart
Included review availability: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review.
- Apply post-review fixes to the indicator view (#70). - shouldRepaint compared the engine object, which never changes, so a flip from reverse or the text direction, a new axis or looping only reached the dots through an unrelated repaint; the painter now compares what it saw at creation. - A regression test pins that switching flush back to centre re-centres the current item.
- Match the other packages: hyphen list markers instead of asterisks, and one doubled space removed. The text is unchanged.
- The enforcement paragraph still broke before the contact email, which starts its own line as an autolink. One line now, same words.
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Summary
flutter_carousel_widget 4.0.0, a rewrite on Flutter 3.47 and
widgets.dartalone.FlutterCarousel(one size) andExpandableCarousel(content-sized) share one private engine with onePageControllerfor the carousel's life, take their options as constructor parameters, share oneFlutterCarouselController, and report exactly what moved them.FlutterCarouselOptionsandExpandableCarouselOptions.FlutterCarouselControllerdrives both widgets; its methods return futures, it exposesindexandposition, and it throws aStateErrorthat says why when detached.CarouselPageChangedReasongainskeyboard.CarouselEffect.builder. Each keeps a constant widget structure, so an item's state survives crossing the centre, and only the effect's wrapper rebuilds while the carousel moves.stopAutoPlaystays stopped; a finite carousel rewinds or, withstopAtEnd, stops.reverse, and run down the trailing edge of a vertical carousel. Dots are tappable, labelled buttons.CarouselEdgeAlignment.flushsettles the first and last items against the edges with the middle ones centred.test/readme_test.dartchecks its claim row, table of contents and links, and every Dart block in it compiles throughtest/readme_snippets.dart. MIGRATION.md maps every 3.x symbol and behaviour change; CHANGELOG has the 4.0.0 entry..coderabbit.yamlskips only the example's binary icons.This layer leaves the 3.x example untouched: the root
analysis_options.yamlexcludesexample/**here, and #71 replaces the example and drops that exclude.Type of change
Related issues
Fixes the verified 3.1.1 defects #16, #29, #48, #59, #60, #62, #65 and #66, and adds what #26, #31, #39 and #58 asked for. The stale bot closed several of these without a fix.
How to test
flutter test(202 tests, leak-tracked) andflutter analyze.Verification checklist
Run locally on this branch, with this branch's own CI steps:
dart format --output=none --set-exit-if-changed .- cleanflutter analyze- 0 issuesflutter test- all tests pass (202)(cd example && flutter test)- not here: the new example and its layout tests arrive in Release v4.0.0 (2/4): repo setup, CI and the new example #71flutter pub publish --dry-run- no warnings, on the finished stack (pana 160/160, dartdoc 258 of 258)pubspec.yamlversion bumped (4.0.0)CHANGELOG.mdhas an entry for that versionreverseand the vertical axis (behaviour matrix and the web demo); screen-reader semantics and announcements are covered by tests, not checked on a deviceSECURITY.mdsupported-versions table still correct - updated to 4.x in Release v4.0.0 (2/4): repo setup, CI and the new example #71🤖 Generated with Claude Code
Summary by CodeRabbit