type 'List<Widget?>' is not a subtype of type 'List<Widget>' in type cast about flutter_inner_drawer

[hukjordanjanaq]

Hi, i used a pull request. In the pubspec.yaml, i change for this:
flutter_inner_drawer: git: url: https://github.com/kenjishiromajp/flutter_inner_drawer ref: kenjishiromajp-update-for-2.12-null-safety-casting

[swiftdev69]

hello @jordanjanaq did you get any solutiion?

[swiftdev69]

Hi, i used a pull request. In the pubspec.yaml, i change for this:
flutter_inner_drawer: git: url: https://github.com/kenjishiromajp/flutter_inner_drawer ref: kenjishiromajp-update-for-2.12-null-safety-casting

This worked for me.

[Wentris71]

thx, solution worked like a charm.

[kksys]

I've encountered this issue.
And, this solution is worked for me.

[yeasin50]

The issue is coming from

flutter_inner_drawer/lib/inner_drawer.dart

Lines 435 to 437 in 9dbe02e

	children: <Widget?>[widget.scaffold, invC != null ? invC : null]
	.where((a) => a != null)
	.toList() as List<Widget>,

children doesn't accept any nullable widget.

Also _trigger(..) method returning nullable widget

flutter_inner_drawer/lib/inner_drawer.dart

Lines 544 to 563 in 9dbe02e

	Widget? _trigger(AlignmentDirectional alignment, Widget? child) {
	assert(alignment != null);
	final bool drawerIsStart = _position == InnerDrawerDirection.start;
	final EdgeInsets padding = MediaQuery.of(context).padding;
	double dragAreaWidth = drawerIsStart ? padding.left : padding.right;
	if (Directionality.of(context) == TextDirection.rtl)
	dragAreaWidth = drawerIsStart ? padding.right : padding.left;
	dragAreaWidth = max(dragAreaWidth, _kEdgeDragWidth);
	if (_controller.status == AnimationStatus.completed &&
	_swipe &&
	child != null)
	return Align(
	alignment: alignment,
	child: Container(color: Colors.transparent, width: dragAreaWidth),
	);
	else
	return null;
	}

And It is being used on

flutter_inner_drawer/lib/inner_drawer.dart

Lines 600 to 620 in 9dbe02e

	children: <Widget?>[
	///Gradient
	Container(
	width: _controller.value == 0 ||
	_animationType == InnerDrawerAnimation.linear
	? 0
	: null,
	color: _colorTransitionChild.evaluate(_controller),
	),
	Align(
	alignment: _drawerOuterAlignment!,
	child: Align(
	alignment: _drawerInnerAlignment!,
	widthFactor: wFactor,
	child: RepaintBoundary(child: _scaffold())),
	),
	///Trigger
	_trigger(AlignmentDirectional.centerStart, _leftChild),
	_trigger(AlignmentDirectional.centerEnd, _rightChild),
	].where((a) => a != null).toList() as List<Widget>,

While the children can't be null anymore, we can remove or replace _trigger() widget when it returns null.