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Use null-aware ? operator #2382

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Merged
domesticmouse merged 2 commits into from
Feb 6, 2026
Merged

Use null-aware ? operator #2382

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b28ed46
Use null-aware `?` operator
domesticmouse Feb 5, 2026
91e03ee
`dart format`
domesticmouse Feb 6, 2026
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18 changes: 6 additions & 12 deletions animations/codelab_rebuild.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -719,17 +719,14 @@ steps:
patch-u: |
--- b/animations/step_03_d/lib/question_screen.dart
+++ a/animations/step_03_d/lib/question_screen.dart
@@ -86,6 +86,15 @@ class QuestionCard extends StatelessWidget {
@@ -86,6 +86,12 @@ class QuestionCard extends StatelessWidget {
@override
Widget build(BuildContext context) {
return AnimatedSwitcher(
+ layoutBuilder: (currentChild, previousChildren) {
+ return Stack(
+ alignment: Alignment.topCenter,
+ children: <Widget>[
+ ...previousChildren,
+ if (currentChild != null) currentChild,
+ ],
+ children: <Widget>[...previousChildren, ?currentChild],
+ );
+ },
transitionBuilder: (child, animation) {
Expand Down Expand Up @@ -831,7 +828,7 @@ steps:
import 'scoreboard.dart';
import 'view_model.dart';

@@ -148,21 +149,24 @@ class AnswerCards extends StatelessWidget {
@@ -145,21 +146,24 @@ class AnswerCards extends StatelessWidget {
if (correctAnswer == index) {
color = Theme.of(context).colorScheme.tertiaryContainer;
}
Expand Down Expand Up @@ -904,7 +901,7 @@ steps:
patch-u: |
--- b/animations/step_04_b/lib/question_screen.dart
+++ a/animations/step_04_b/lib/question_screen.dart
@@ -150,6 +150,7 @@ class AnswerCards extends StatelessWidget {
@@ -147,6 +147,7 @@ class AnswerCards extends StatelessWidget {
color = Theme.of(context).colorScheme.tertiaryContainer;
}
return CardFlipEffect(
Expand Down Expand Up @@ -1133,18 +1130,15 @@ steps:
import 'package:flutter/material.dart';
import 'flip_effect.dart';
import 'scoreboard.dart';
@@ -86,28 +87,15 @@ class QuestionCard extends StatelessWidget {
@@ -86,25 +87,15 @@ class QuestionCard extends StatelessWidget {

@override
Widget build(BuildContext context) {
- return AnimatedSwitcher(
- layoutBuilder: (currentChild, previousChildren) {
- return Stack(
- alignment: Alignment.topCenter,
- children: <Widget>[
- ...previousChildren,
- if (currentChild != null) currentChild,
- ],
- children: <Widget>[...previousChildren, ?currentChild],
- );
+ return PageTransitionSwitcher(
+ layoutBuilder: (entries) {
Expand Down
5 changes: 1 addition & 4 deletions animations/step_03_d/lib/question_screen.dart
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -89,10 +89,7 @@ class QuestionCard extends StatelessWidget {
layoutBuilder: (currentChild, previousChildren) {
return Stack(
alignment: Alignment.topCenter,
children: <Widget>[
...previousChildren,
if (currentChild != null) currentChild,
],
children: <Widget>[...previousChildren, ?currentChild],
);
},
transitionBuilder: (child, animation) {
Expand Down
5 changes: 1 addition & 4 deletions animations/step_04_a/lib/question_screen.dart
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -90,10 +90,7 @@ class QuestionCard extends StatelessWidget {
layoutBuilder: (currentChild, previousChildren) {
return Stack(
alignment: Alignment.topCenter,
children: <Widget>[
...previousChildren,
if (currentChild != null) currentChild,
],
children: <Widget>[...previousChildren, ?currentChild],
);
},
transitionBuilder: (child, animation) {
Expand Down
5 changes: 1 addition & 4 deletions animations/step_04_b/lib/question_screen.dart
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -90,10 +90,7 @@ class QuestionCard extends StatelessWidget {
layoutBuilder: (currentChild, previousChildren) {
return Stack(
alignment: Alignment.topCenter,
children: <Widget>[
...previousChildren,
if (currentChild != null) currentChild,
],
children: <Widget>[...previousChildren, ?currentChild],
);
},
transitionBuilder: (child, animation) {
Expand Down
5 changes: 1 addition & 4 deletions animations/step_04_c/lib/question_screen.dart
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -90,10 +90,7 @@ class QuestionCard extends StatelessWidget {
layoutBuilder: (currentChild, previousChildren) {
return Stack(
alignment: Alignment.topCenter,
children: <Widget>[
...previousChildren,
if (currentChild != null) currentChild,
],
children: <Widget>[...previousChildren, ?currentChild],
);
},
transitionBuilder: (child, animation) {
Expand Down
5 changes: 1 addition & 4 deletions animations/step_04_d/lib/question_screen.dart
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -90,10 +90,7 @@ class QuestionCard extends StatelessWidget {
layoutBuilder: (currentChild, previousChildren) {
return Stack(
alignment: Alignment.topCenter,
children: <Widget>[
...previousChildren,
if (currentChild != null) currentChild,
],
children: <Widget>[...previousChildren, ?currentChild],
);
},
transitionBuilder: (child, animation) {
Expand Down
5 changes: 1 addition & 4 deletions animations/step_05_a/lib/question_screen.dart
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -90,10 +90,7 @@ class QuestionCard extends StatelessWidget {
layoutBuilder: (currentChild, previousChildren) {
return Stack(
alignment: Alignment.topCenter,
children: <Widget>[
...previousChildren,
if (currentChild != null) currentChild,
],
children: <Widget>[...previousChildren, ?currentChild],
);
},
transitionBuilder: (child, animation) {
Expand Down
5 changes: 1 addition & 4 deletions animations/step_05_b/lib/question_screen.dart
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -90,10 +90,7 @@ class QuestionCard extends StatelessWidget {
layoutBuilder: (currentChild, previousChildren) {
return Stack(
alignment: Alignment.topCenter,
children: <Widget>[
...previousChildren,
if (currentChild != null) currentChild,
],
children: <Widget>[...previousChildren, ?currentChild],
);
},
transitionBuilder: (child, animation) {
Expand Down
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