Add leadingIndex to CarouselController and onItemChanged to CarouselView#180667
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This pull request introduces an onIndexChanged callback to CarouselView and a leadingItem property to CarouselController, enabling developers to track and query the leading item in the carousel. The implementation correctly uses a NotificationListener to detect scroll changes and trigger the callback. The logic for calculating the leading item index, considering different configurations like flexWeights and consumeMaxWeight, has been added to _CarouselPosition. Additionally, comprehensive tests are included to validate the new functionality under various conditions, such as animations and user gestures. The changes are well-structured and thoroughly tested.
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Piinks
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Piinks
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Piinks
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LGTM with some doc comments:)
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…iew (flutter#180667) Adds a `leadingIndex` property to CarouselController and an `onItemChanged` callback to CarouselView. Closes flutter#169207 ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [ ] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord]. <!-- Links --> [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md
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Adds a
leadingIndexproperty to CarouselController and anonItemChangedcallback to CarouselView.Closes #169207
Pre-launch Checklist
///).If you need help, consider asking for advice on the #hackers-new channel on Discord.