Change ItemExtentBuilder's return value nullable
#142428
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Piinks
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Thanks so much for picking this up! I was going to look into it this week and you beat me to it. :)
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I feel like this would still be error prone for users. Is it possible we can use https://api.flutter.dev/flutter/rendering/RenderSliverBoxChildManager/childCount.html ? It should be available through the super class childManager, but it may need to be set by passing it through the delegate. What do you think?
Being able to short circuit and not call these methods for indices we don't need to would be more efficient too.
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Oh this is neat, but I don't know if it is necessary. The scenarios I was referring to are when the SliverChildDelegate gives us a fixed childCount.
Such as SliverChildBuilderDelegate.childCount, and SliverChildListDelegate.children.length.
If the sliver does not know how many children it has, then I would totally expect the extent builder to just return null, just like when the child builder delegate returns null to indicate the end of the list when childCount is not set.
Do you think we need to try to cache this extent? The implementation of isFiniteChildren could be very expensive. Do you think we need it?
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| /// See also: | ||
| /// | ||
| /// * [SliverChildDelegate.estimatedChildCount], to which this getter defers. | ||
| int? get estimatedChildCount => null; |
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Manual roll Flutter from 5129806 to efee280 (47 revisions) Manual roll requested by [email protected] flutter/flutter@5129806...efee280 2024-02-22 [email protected] Roll Flutter Engine from bf5c003085fd to 7eeb697687d5 (16 revisions) (flutter/flutter#143911) 2024-02-22 [email protected] Update PR template for dart fix (flutter/flutter#143879) 2024-02-22 [email protected] Re-use methods to calculate leading and trailing garbage in RenderSliverMultiBoxAdaptor (flutter/flutter#143884) 2024-02-21 98614782+auto-submit[bot]@users.noreply.github.com Reverts "[Impeller] Make impeller goldens test blocking. (#143864)" (flutter/flutter#143896) 2024-02-21 [email protected] [Impeller] Make impeller goldens test blocking. (flutter/flutter#143864) 2024-02-21 [email protected] Disable color filter sepia test for Impeller. (flutter/flutter#143861) 2024-02-21 [email protected] Roll Flutter Engine from 52ffcaadea41 to bf5c003085fd (12 revisions) (flutter/flutter#143875) 2024-02-21 [email protected] Roll Flutter Engine from 4128895d79a1 to 52ffcaadea41 (1 revision) (flutter/flutter#143862) 2024-02-21 [email protected] Deprecate redundant itemExtent in RenderSliverFixedExtentBoxAdaptor methods (flutter/flutter#143412) 2024-02-21 [email protected] Add aab as alias for appbundle (flutter/flutter#143855) 2024-02-21 [email protected] Roll Flutter Engine from e16f43eeaaa4 to 4128895d79a1 (1 revision) (flutter/flutter#143856) 2024-02-21 [email protected] Roll Packages from 8bba41b to 48048f6 (2 revisions) (flutter/flutter#143853) 2024-02-21 [email protected] Update `hourMinuteTextStyle` defaults for Material 3 Time Picker (flutter/flutter#143749) 2024-02-21 [email protected] Roll Flutter Engine from 93063f61943a to e16f43eeaaa4 (2 revisions) (flutter/flutter#143827) 2024-02-21 [email protected] Roll Flutter Engine from ed49634486e9 to 93063f61943a (1 revision) (flutter/flutter#143826) 2024-02-21 [email protected] `CalendarDatePicker` doesn't announce selected date on desktop (flutter/flutter#143583) 2024-02-21 [email protected] Roll Flutter Engine from 9100d326475a to ed49634486e9 (2 revisions) (flutter/flutter#143824) 2024-02-21 [email protected] Add `timeSelectorSeparatorColor` and `timeSelectorSeparatorTextStyle` for Material 3 Time Picker (flutter/flutter#143739) 2024-02-21 [email protected] Roll Flutter Engine from efc69946cb1e to 9100d326475a (2 revisions) (flutter/flutter#143820) 2024-02-21 [email protected] Roll Flutter Engine from 700250436e3f to efc69946cb1e (2 revisions) (flutter/flutter#143816) 2024-02-21 [email protected] Roll Flutter Engine from 3557277c575c to 700250436e3f (1 revision) (flutter/flutter#143814) 2024-02-21 [email protected] more fixes to unstable impeller goldens. (flutter/flutter#143811) 2024-02-21 [email protected] Roll Flutter Engine from cb12a8cc97a1 to 3557277c575c (2 revisions) (flutter/flutter#143807) 2024-02-21 [email protected] [flutter_tools] enable wasm compile on beta channel (flutter/flutter#143779) 2024-02-21 [email protected] Fix initialization of time in repeat on AnimationController (flutter/flutter#142887) 2024-02-21 [email protected] Disable debug banner to stabilize impeller goldens. (flutter/flutter#143794) 2024-02-21 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Changing `TextPainter.getOffsetForCaret` implementation to remove the logarithmic search (#143281)" (flutter/flutter#143801) 2024-02-20 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Add UI Benchmarks (#143542)" (flutter/flutter#143798) 2024-02-20 [email protected] Avoid applying partial dartfixes on CI (flutter/flutter#143551) 2024-02-20 [email protected] Add UI Benchmarks (flutter/flutter#143542) 2024-02-20 [email protected] Roll Flutter Engine from 1ae2c10e8071 to cb12a8cc97a1 (1 revision) (flutter/flutter#143791) 2024-02-20 [email protected] Implement `_suspendedNode` fix (flutter/flutter#143556) 2024-02-20 [email protected] Change `ItemExtentBuilder`'s return value nullable (flutter/flutter#142428) 2024-02-20 [email protected] Roll Flutter Engine from 27828054f07a to 1ae2c10e8071 (6 revisions) (flutter/flutter#143783) 2024-02-20 [email protected] Roll Flutter Engine from e16a260265ad to 27828054f07a (1 revision) (flutter/flutter#143769) 2024-02-20 [email protected] [gold] Always provide host ABI to gold config (flutter/flutter#143621) 2024-02-20 [email protected] instead of exiting the tool, print a warning when using --flavor with an incompatible device (flutter/flutter#143735) 2024-02-20 [email protected] Implementing `switch` expressions: everything in `flutter/lib/src/` (flutter/flutter#143634) 2024-02-20 [email protected] Changing `TextPainter.getOffsetForCaret` implementation to remove the logarithmic search (flutter/flutter#143281) 2024-02-20 [email protected] Delete local.properties that shouldn't have been pushed (flutter/flutter#143774) 2024-02-20 [email protected] Clean leaks. (flutter/flutter#142818) 2024-02-20 [email protected] Introduce tone-based surfaces and accent color add-ons - Part 2 (flutter/flutter#138521) 2024-02-20 [email protected] Explain when and why to use CrossAxisAlignment.baseline (flutter/flutter#143632) 2024-02-20 [email protected] Roll Flutter Engine from a41da3701923 to e16a260265ad (2 revisions) (flutter/flutter#143763) ...
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) Manual roll Flutter from 5129806 to efee280 (47 revisions) Manual roll requested by [email protected] flutter/flutter@5129806...efee280 2024-02-22 [email protected] Roll Flutter Engine from bf5c003085fd to 7eeb697687d5 (16 revisions) (flutter/flutter#143911) 2024-02-22 [email protected] Update PR template for dart fix (flutter/flutter#143879) 2024-02-22 [email protected] Re-use methods to calculate leading and trailing garbage in RenderSliverMultiBoxAdaptor (flutter/flutter#143884) 2024-02-21 98614782+auto-submit[bot]@users.noreply.github.com Reverts "[Impeller] Make impeller goldens test blocking. (#143864)" (flutter/flutter#143896) 2024-02-21 [email protected] [Impeller] Make impeller goldens test blocking. (flutter/flutter#143864) 2024-02-21 [email protected] Disable color filter sepia test for Impeller. (flutter/flutter#143861) 2024-02-21 [email protected] Roll Flutter Engine from 52ffcaadea41 to bf5c003085fd (12 revisions) (flutter/flutter#143875) 2024-02-21 [email protected] Roll Flutter Engine from 4128895d79a1 to 52ffcaadea41 (1 revision) (flutter/flutter#143862) 2024-02-21 [email protected] Deprecate redundant itemExtent in RenderSliverFixedExtentBoxAdaptor methods (flutter/flutter#143412) 2024-02-21 [email protected] Add aab as alias for appbundle (flutter/flutter#143855) 2024-02-21 [email protected] Roll Flutter Engine from e16f43eeaaa4 to 4128895d79a1 (1 revision) (flutter/flutter#143856) 2024-02-21 [email protected] Roll Packages from 8bba41b to 48048f6 (2 revisions) (flutter/flutter#143853) 2024-02-21 [email protected] Update `hourMinuteTextStyle` defaults for Material 3 Time Picker (flutter/flutter#143749) 2024-02-21 [email protected] Roll Flutter Engine from 93063f61943a to e16f43eeaaa4 (2 revisions) (flutter/flutter#143827) 2024-02-21 [email protected] Roll Flutter Engine from ed49634486e9 to 93063f61943a (1 revision) (flutter/flutter#143826) 2024-02-21 [email protected] `CalendarDatePicker` doesn't announce selected date on desktop (flutter/flutter#143583) 2024-02-21 [email protected] Roll Flutter Engine from 9100d326475a to ed49634486e9 (2 revisions) (flutter/flutter#143824) 2024-02-21 [email protected] Add `timeSelectorSeparatorColor` and `timeSelectorSeparatorTextStyle` for Material 3 Time Picker (flutter/flutter#143739) 2024-02-21 [email protected] Roll Flutter Engine from efc69946cb1e to 9100d326475a (2 revisions) (flutter/flutter#143820) 2024-02-21 [email protected] Roll Flutter Engine from 700250436e3f to efc69946cb1e (2 revisions) (flutter/flutter#143816) 2024-02-21 [email protected] Roll Flutter Engine from 3557277c575c to 700250436e3f (1 revision) (flutter/flutter#143814) 2024-02-21 [email protected] more fixes to unstable impeller goldens. (flutter/flutter#143811) 2024-02-21 [email protected] Roll Flutter Engine from cb12a8cc97a1 to 3557277c575c (2 revisions) (flutter/flutter#143807) 2024-02-21 [email protected] [flutter_tools] enable wasm compile on beta channel (flutter/flutter#143779) 2024-02-21 [email protected] Fix initialization of time in repeat on AnimationController (flutter/flutter#142887) 2024-02-21 [email protected] Disable debug banner to stabilize impeller goldens. (flutter/flutter#143794) 2024-02-21 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Changing `TextPainter.getOffsetForCaret` implementation to remove the logarithmic search (#143281)" (flutter/flutter#143801) 2024-02-20 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Add UI Benchmarks (#143542)" (flutter/flutter#143798) 2024-02-20 [email protected] Avoid applying partial dartfixes on CI (flutter/flutter#143551) 2024-02-20 [email protected] Add UI Benchmarks (flutter/flutter#143542) 2024-02-20 [email protected] Roll Flutter Engine from 1ae2c10e8071 to cb12a8cc97a1 (1 revision) (flutter/flutter#143791) 2024-02-20 [email protected] Implement `_suspendedNode` fix (flutter/flutter#143556) 2024-02-20 [email protected] Change `ItemExtentBuilder`'s return value nullable (flutter/flutter#142428) 2024-02-20 [email protected] Roll Flutter Engine from 27828054f07a to 1ae2c10e8071 (6 revisions) (flutter/flutter#143783) 2024-02-20 [email protected] Roll Flutter Engine from e16a260265ad to 27828054f07a (1 revision) (flutter/flutter#143769) 2024-02-20 [email protected] [gold] Always provide host ABI to gold config (flutter/flutter#143621) 2024-02-20 [email protected] instead of exiting the tool, print a warning when using --flavor with an incompatible device (flutter/flutter#143735) 2024-02-20 [email protected] Implementing `switch` expressions: everything in `flutter/lib/src/` (flutter/flutter#143634) 2024-02-20 [email protected] Changing `TextPainter.getOffsetForCaret` implementation to remove the logarithmic search (flutter/flutter#143281) 2024-02-20 [email protected] Delete local.properties that shouldn't have been pushed (flutter/flutter#143774) 2024-02-20 [email protected] Clean leaks. (flutter/flutter#142818) 2024-02-20 [email protected] Introduce tone-based surfaces and accent color add-ons - Part 2 (flutter/flutter#138521) 2024-02-20 [email protected] Explain when and why to use CrossAxisAlignment.baseline (flutter/flutter#143632) 2024-02-20 [email protected] Roll Flutter Engine from a41da3701923 to e16a260265ad (2 revisions) (flutter/flutter#143763) ...
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Fixes #138912
Change
ItemExtentBuilder's return value nullable, it should return null if asked to build an item extent with a greater index than exists.