Implements `RenderBox.computeDryBaseline` for material render boxes #146027

LongCatIsLooong · 2024-03-30T05:24:34Z

RenderChip and RenderInputDecorator changes are larger so they are not included.

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I read the Contributor Guide and followed the process outlined there for submitting PRs.
I read the Tree Hygiene wiki page, which explains my responsibilities.
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.
I updated/added relevant documentation (doc comments with ///).
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.
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LongCatIsLooong · 2024-03-30T05:29:30Z

packages/flutter/lib/src/material/list_tile.dart

Updating documentation, no behavior changes here.

Also the documentation says "if the titles' overall height is greater than 72" but the code checks tileHeight > 72. Typo?

Hm, what am I missing here? Isn't tileHeight > 72 the same as saying the tile hight is greater than 72?

the documentation says "title" but the comment says "tile". These two have different sizes.

Oh, I missed that one is tile and the other one is title. Probably a typo in the docs? Since nobody seems to have complained about the implementation, lets make the doc match the implementation?

goderbauer · 2024-04-01T17:45:14Z

packages/flutter/lib/src/material/app_bar.dart

-    }
-    final Size size = this.size = _computeSize(constraints, ChildLayoutHelper.layoutChild);
-    final Size childSize = child.size;
+  Size computeDryLayout(BoxConstraints constraints) => child == null ? Size.zero : constraints.biggest;


Oh, nice simplification of what we were doing before. No need to call into the child.

goderbauer · 2024-04-01T17:50:48Z

packages/flutter/lib/src/material/bottom_sheet.dart

+    child.layout(childConstraints, parentUsesSize: !childConstraints.isTight);
+    final BoxParentData childParentData = child.parentData! as BoxParentData;
+    final Size childSize = childConstraints.isTight ? childConstraints.smallest : child.size;
+      childParentData.offset = _getPositionForChild(size, childSize);


nit: indentation

goderbauer · 2024-04-01T17:55:53Z

packages/flutter/lib/src/material/time_picker.dart

+    final Size childSize = child.getDryLayout(constraints);
+    return result + Alignment.center.alongOffset(getDryLayout(constraints) - childSize as Offset).dy;
+  }
+


It seems like this code pattern is repeated in a couple of subclasses of RenderShiftedBox. Would it make sense to have RenderShiftedBox implement this as default?

RenderShiftedBox doesn't specify its layout algorithm. To get the baseline of a child computeDryBaseline have to know the offset of each child. computeDryLayout isn't implemented for this abstract class either.

goderbauer · 2024-04-01T17:58:49Z

packages/flutter/lib/src/rendering/shifted_box.dart

+  /// This is the [alignment] resolved against [textDirection]. Subclasses should
+  /// use [resolvedAlignment] instead of [alignment] directly, for computing the
+  /// child's offset.
+  @protected


Would we still have to expose this if we'd move some dryBaseline base functionality into one of the base classes?

not for _RenderAppBarTitleBox because it changes the constraints before passing it onto its child:

class _RenderAppBarTitleBox extends RenderAligningShiftedBox { @override double? computeDryBaseline(covariant BoxConstraints constraints, TextBaseline baseline) { final BoxConstraints innerConstraints = constraints.copyWith(maxHeight: double.infinity); ... }

goderbauer · 2024-04-01T17:59:34Z

packages/flutter/lib/src/rendering/shifted_box.dart

+  ///
+  /// This is the [alignment] resolved against [textDirection]. Subclasses should
+  /// use [resolvedAlignment] instead of [alignment] directly, for computing the
+  /// child's offset.


If I rely on this, how do I know it has changed and I need to redo the work depending on it?

If alignment or textDirection changes then markNeedsLayout will be called?

Maybe document that layout will be triggered whenever this changes?

goderbauer · 2024-04-01T18:05:16Z

packages/flutter/lib/src/material/list_tile.dart

Hm, what am I missing here? Isn't tileHeight > 72 the same as saying the tile hight is greater than 72?

goderbauer · 2024-04-01T18:09:07Z

packages/flutter/lib/src/material/list_tile.dart


  RenderBox? get leading => childForSlot(_ListTileSlot.leading);
-  RenderBox? get title => childForSlot(_ListTileSlot.title);
+  RenderBox get title => childForSlot(_ListTileSlot.title)!;


This change is kinda odd for breaking the symmetry with the other getters. Why is it guaranteed that we have a title?

Also strange in combination with line 1124 and 1129 where it is assumed that we may not have a title again...

_RenderListTile assumes the title is not null in its layout methods. Also its render object widget has these fields:

final Widget? leading; final Widget title; final Widget? subtitle; final Widget? trailing;

so unless title doesn't create any render objects it's going to be non-null.

But unfortunatly SlottedContainerRenderObjectMixin uses children in its attach implementation so it's possible the title has not been added as a child when attach is called.

goderbauer · 2024-04-01T18:11:22Z

packages/flutter/lib/src/material/list_tile.dart

+    BoxConstraints constraints,
+    { _PositionChild? positionChild, }
+  ) {


nit: our formatting style here (I think) is:

Suggested change

BoxConstraints constraints,

{ _PositionChild? positionChild, }

) {

BoxConstraints constraints, {

_PositionChild? positionChild,

}) {

goderbauer

LGTM

… boxes (flutter/flutter#146027)

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LongCatIsLooong added 2 commits March 29, 2024 15:27

wip

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list tile

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github-actions bot added framework flutter/packages/flutter repository. See also f: labels. f: material design flutter/packages/flutter/material repository. labels Mar 30, 2024

list tile

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LongCatIsLooong force-pushed the material-dry-baseline branch from 6600a16 to 270e4d2 Compare March 30, 2024 05:46

LongCatIsLooong commented Mar 30, 2024

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LongCatIsLooong marked this pull request as ready for review March 30, 2024 20:55

Merge branch 'master' into material-dry-baseline

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LongCatIsLooong requested a review from goderbauer April 1, 2024 17:21

goderbauer reviewed Apr 1, 2024

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Update shifted_box.dart

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LongCatIsLooong added the autosubmit Merge PR when tree becomes green via auto submit App label Apr 2, 2024

auto-submit bot merged commit fd98a2f into flutter:master Apr 2, 2024

LongCatIsLooong deleted the material-dry-baseline branch April 2, 2024 18:43

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fd98a2f Implements RenderBox.computeDryBaseline for material render…

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… boxes (flutter/flutter#146027)

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Roll Flutter from a418568a6498 to 1326c8ee536e (29 revisions) flutter/packages#6454

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fd98a2f Implements RenderBox.computeDryBaseline for material render…

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fd98a2f Implements RenderBox.computeDryBaseline for material render…

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… boxes (flutter/flutter#146027)

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Implements RenderBox.computeDryBaseline for material render boxes #146027

Implements RenderBox.computeDryBaseline for material render boxes #146027

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LongCatIsLooong commented Mar 30, 2024

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Implements `RenderBox.computeDryBaseline` for material render boxes #146027

Implements `RenderBox.computeDryBaseline` for material render boxes #146027