Fix the issue where calling showOnScreen on a sliver after a pinned child in SliverMainAxisGroup does not reveal it. #171339
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| /// | ||
| /// Typically used by [RenderViewportBase.getOffsetToReveal] to ensure a particular | ||
| /// child is visible. | ||
| double? childScrollOffsetToReveal(covariant RenderObject child) { |
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Why add this method instead of handling it in the already overridden childScrollOffset in RenderSliverMainAxisGroup?
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Based on the current childScrollOffset documentation, it should return the scroll offset of a child item, not necessarily for making the child visible. However, currently in RenderSliverMainAxisGroup, it seems to only be called during ensureVisible. I tried directly overriding childScrollOffset and all tests in sliver_main_axis_group_test.dart still pass. So I think this approach is also feasible. But I think childScrollOffsetToReveal is also good - it can clearly indicate that it's for revealing a child item's offset. If we don't do this, we might need to modify the documentation description of childScrollOffset. I'll follow your guidance on which approach to use.
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It looks like this is the value people would consider correct and want back from childScrollOffset for RenderSliverMainAxisGroup.
I think it makes sense to update the docs for childScrollOffset to clarify. I think SliverMainAxisGroup was the first, and the only so far, sliver that contains sliver children. We already have childScrollOffset and childMainAxis, adding to this space might be confusing to determine which means what.
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The childScrollOffsetToReveal method also made me think that folks would expect to be able to configure the alignment and have a return type of RevealedOffset, which the other similar API does.
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Roll Flutter from c3279caa127d to 871849e4b6bf (56 revisions) flutter/flutter@c3279ca...871849e 2025-08-01 [email protected] Roll Dart SDK from 6832e04cf2f9 to 6e1bb159c860 (8 revisions) (flutter/flutter#173119) 2025-08-01 [email protected] Add `--profile-startup` flag to `flutter run` (flutter/flutter#172990) 2025-08-01 [email protected] Add `side` to `RadioThemeData` (flutter/flutter#171945) 2025-08-01 [email protected] Update GCA instructions (flutter/flutter#173001) 2025-08-01 [email protected] [engine] Null aware elements clean-ups (flutter/flutter#173075) 2025-08-01 [email protected] Roll Packages from db6988d to f0645d8 (3 revisions) (flutter/flutter#173111) 2025-08-01 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Reland licenses cpp switch 3 (#173063)" (flutter/flutter#173113) 2025-08-01 [email protected] Update embedder API CODEOWNERS (flutter/flutter#173081) 2025-08-01 [email protected] Move android_obfuscate_test from devicelab into tools integration.shard (flutter/flutter#169798) 2025-08-01 [email protected] [A11y] RangeSlider should have 2 focus node (flutter/flutter#172729) 2025-07-31 [email protected] Upload the linux arm64 embedder to cloud buckets. (flutter/flutter#173068) 2025-07-31 [email protected] Reland licenses cpp switch 3 (flutter/flutter#173063) 2025-07-31 [email protected] [ Tool ] Mark IOOverrides subclasses as `final` (flutter/flutter#173078) 2025-07-31 [email protected] [macOS] Remove duplicate object initialization (flutter/flutter#171767) 2025-07-31 [email protected] Redistribute Android test owners (flutter/flutter#172886) 2025-07-31 [email protected] Avoid negatives in the styleguide.md (flutter/flutter#172917) 2025-07-31 [email protected] Roll Skia from 42e3bed42110 to 49e39cd3cf18 (7 revisions) (flutter/flutter#173069) 2025-07-31 [email protected] Fix the issue where calling showOnScreen on a sliver after a pinned child in SliverMainAxisGroup does not reveal it. (flutter/flutter#171339) 2025-07-31 [email protected] Improve assertion message in `EdgeInsetsDirectional.resolve` (flutter/flutter#172099) 2025-07-31 [email protected] licenses_cpp: Switched to lexically_relative for 2x speed boost. (flutter/flutter#173048) 2025-07-31 [email protected] Add dartvm to the dart_sdk_entitlement_config list. (flutter/flutter#173044) 2025-07-31 [email protected] [web] ClickDebouncer workaround for iOS Safari click behavior (flutter/flutter#172995) 2025-07-31 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Reland licenses cpp switch 2 (#172996)" (flutter/flutter#173059) 2025-07-31 [email protected] [web] Text editing test accepts both behaviors in Firefox (flutter/flutter#172767) 2025-07-31 [email protected] Reland licenses cpp switch 2 (flutter/flutter#172996) 2025-07-31 [email protected] Roll Packages from d914120 to db6988d (2 revisions) (flutter/flutter#173039) 2025-07-31 [email protected] Add a SliverList code sample (flutter/flutter#172986) 2025-07-31 [email protected] fix: adjust scrollable size assertion with tolerance (flutter/flutter#171426) 2025-07-31 [email protected] impeller: Shrink `Command` 40 bytes (flutter/flutter#173004) 2025-07-31 [email protected] [web] Remove outdated comment about HTML renderer (flutter/flutter#172877) 2025-07-31 [email protected] Roll Skia from ff4da49305c5 to 42e3bed42110 (1 revision) (flutter/flutter#173038) 2025-07-31 [email protected] Roll Skia from 7d468a4868cb to ff4da49305c5 (3 revisions) (flutter/flutter#173028) 2025-07-31 [email protected] Roll Skia from 951277895c86 to 7d468a4868cb (1 revision) (flutter/flutter#173027) 2025-07-31 [email protected] Manual roll of Dart from 14ea8d342149 to 6832e04cf2f9 (flutter/flutter#173015) 2025-07-31 [email protected] Roll Skia from 8bdf4cdcf4ed to 951277895c86 (2 revisions) (flutter/flutter#173022) 2025-07-31 [email protected] Roll Fuchsia Linux SDK from bQVQlLssTxxLjoDU0... to xo_bqOoFuBKFmgKxn... (flutter/flutter#173021) 2025-07-31 [email protected] feat: Add `cursorHeight` to `DropdownMenu` (flutter/flutter#172615) 2025-07-31 [email protected] Roll Skia from a3347cee2d73 to 8bdf4cdcf4ed (3 revisions) (flutter/flutter#173013) 2025-07-31 [email protected] [ Widget Preview ] Add `--web-server` support (flutter/flutter#172978) 2025-07-30 [email protected] Bump customer tests for zulip fix 2 (flutter/flutter#173003) 2025-07-30 [email protected] Migrate to null aware elements - Part 4 (flutter/flutter#172322) 2025-07-30 [email protected] Marks Linux linux_feature_flags_test to be unflaky (flutter/flutter#172629) 2025-07-30 [email protected] [ Widget Previews ] Add support for `MultiPreview`s (flutter/flutter#172852) 2025-07-30 [email protected] Made licenses_cpp simpatico with google licenses (flutter/flutter#172991) 2025-07-30 [email protected] Roll Skia from d579722d65c6 to a3347cee2d73 (6 revisions) (flutter/flutter#172989) 2025-07-30 [email protected] Migrate to null aware elements - Part 5 (flutter/flutter#172418) ...
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…hild in SliverMainAxisGroup does not reveal it. (flutter#171339) Fixes: flutter#154615 ## 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. - [ ] 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]. - [x] 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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…hild in SliverMainAxisGroup does not reveal it. (flutter#171339) Fixes: flutter#154615 ## 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. - [ ] 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]. - [x] 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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…hild in SliverMainAxisGroup does not reveal it. (flutter#171339) Fixes: flutter#154615 ## 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. - [ ] 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]. - [x] 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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…a pinned child in SliverMainAxisGroup does not reveal it. (flutter/flutter#171339)
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…hild in SliverMainAxisGroup does not reveal it. (flutter#171339) Fixes: flutter#154615 ## 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. - [ ] 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]. - [x] 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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Fixes: #154615
Pre-launch Checklist
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