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Avoid calling performLayout when only the relayout boundary is different#99056

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LongCatIsLooong:avoid-performLayout-on-relayout-boundary-changes
Mar 9, 2022
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Avoid calling performLayout when only the relayout boundary is different#99056
fluttergithubbot merged 4 commits intoflutter:masterfrom
LongCatIsLooong:avoid-performLayout-on-relayout-boundary-changes

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@LongCatIsLooong LongCatIsLooong commented Feb 24, 2022 •
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In theory a render subtree shouldn't redo its layout if the incoming constraints are the same and nothing in the tree is dirty. Whether a node is a relayout boundary (or who its relayout boundary is) isn't really "inherent" and shouldn't affect the subtree's layout.

This pull request:

  • Prevents RenderObject.layout from aggressively marking everything dirty in a subtree until the next relayout boundary is reached (instead mark everything dirty until the closest known repaint boundary in RenderObject.markNeedsLayout).
  • Only updates the relayout boundaries if necessary, instead of performing a full layout, for clean nodes that has the same constraints.

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  • I read and followed the Flutter Style Guide, including Features we expect every widget to implement.
  • I signed the CLA.
  • I listed at least one issue that this PR fixes in the description above.
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@flutter-dashboard flutter-dashboard bot added the framework flutter/packages/flutter repository. See also f: labels. label Feb 24, 2022
@LongCatIsLooong LongCatIsLooong force-pushed the avoid-performLayout-on-relayout-boundary-changes branch from bd50354 to b1ffd1e Compare February 24, 2022 08:01
@LongCatIsLooong LongCatIsLooong force-pushed the avoid-performLayout-on-relayout-boundary-changes branch 2 times, most recently from 74050d8 to 51ef6ff Compare March 5, 2022 00:44
@LongCatIsLooong LongCatIsLooong force-pushed the avoid-performLayout-on-relayout-boundary-changes branch from 51ef6ff to f506e5f Compare March 5, 2022 00:55
@LongCatIsLooong LongCatIsLooong marked this pull request as ready for review March 5, 2022 01:27
goderbauer
goderbauer approved these changes Mar 7, 2022
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LGTM

packages/flutter/test/rendering/relayout_boundary_test.dart Outdated
Comment on lines +57 to +59
set layoutCount(int newValue) {
renderObject.layoutCount = newValue;
}
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Do you need this setter? Maybe remove it since it is a bit doggy.

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I'd probably also remove the getter as well and just obtain the current layoutCount value in the test with tester.renderObject<RenderLayoutCount>(find.byType(RenderLayoutCount)).layoutCount. Currently the test reads a little strange with getting the layoutCount off a widget...

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@LongCatIsLooong LongCatIsLooong Mar 8, 2022

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Switched to WidgetToRenderBoxAdapter instead

@fluttergithubbot fluttergithubbot merged commit bf6fcee into flutter:master Mar 9, 2022
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bf6fcee Avoid calling performLayout when only the relayout boundary…
8be1058 
… is different (flutter/flutter#99056)
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bf6fcee Avoid calling performLayout when only the relayout boundary…
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… is different (flutter/flutter#99056)
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bf6fcee Avoid calling performLayout when only the relayout boundary…
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… is different (flutter/flutter#99056)
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bf6fcee Avoid calling performLayout when only the relayout boundary…
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… is different (flutter/flutter#99056)
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… is different (flutter/flutter#99056)
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bf6fcee Avoid calling performLayout when only the relayout boundary…
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bf6fcee Avoid calling performLayout when only the relayout boundary…
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… is different (flutter/flutter#99056)
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… is different (flutter/flutter#99056)
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… is different (flutter/flutter#99056)
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… is different (flutter/flutter#99056)
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bf6fcee Avoid calling performLayout when only the relayout boundary…
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… is different (flutter/flutter#99056)
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bf6fcee Avoid calling performLayout when only the relayout boundary…
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… is different (flutter/flutter#99056)
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bf6fcee Avoid calling performLayout when only the relayout boundary…
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… is different (flutter/flutter#99056)
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bf6fcee Avoid calling performLayout when only the relayout boundary…
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… is different (flutter/flutter#99056)
LongCatIsLooong added a commit that referenced this pull request Mar 14, 2022
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Revert "Avoid calling performLayout when only the relayout boundary…
563ef6f 
… is different (#99056)"

This reverts commit bf6fcee.
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bf6fcee Avoid calling performLayout when only the relayout boundary…
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… is different (flutter/flutter#99056)
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… is different (flutter/flutter#99056)
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… is different (flutter/flutter#99056)
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