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_DefaultTabControllerState should dispose all created TabContoller instances. (#136608)
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@ -132,8 +132,11 @@ class TabController extends ChangeNotifier {
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}) : _index = index,
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_previousIndex = previousIndex,
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_animationController = animationController,
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_animationDuration = animationDuration;
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_animationDuration = animationDuration {
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if (kFlutterMemoryAllocationsEnabled) {
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ChangeNotifier.maybeDispatchObjectCreation(this);
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}
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}
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/// Creates a new [TabController] with `index`, `previousIndex`, `length`, and
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/// `animationDuration` if they are non-null.
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@ -142,7 +145,10 @@ class TabController extends ChangeNotifier {
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///
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/// When [DefaultTabController.length] is updated, this method is called to
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/// create a new [TabController] without creating a new [AnimationController].
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TabController _copyWith({
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///
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/// This instance of [TabController] will be disposed and must not be used
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/// anymore.
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TabController _copyWithAndDispose({
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required int? index,
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required int? length,
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required int? previousIndex,
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@ -151,13 +157,20 @@ class TabController extends ChangeNotifier {
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if (index != null) {
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_animationController!.value = index.toDouble();
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}
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return TabController._(
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final TabController newController = TabController._(
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index: index ?? _index,
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length: length ?? this.length,
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animationController: _animationController,
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previousIndex: previousIndex ?? _previousIndex,
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animationDuration: animationDuration ?? _animationDuration,
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);
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// Nulling _animationController to not dispose it. It will be disposed by
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// the newly created instance of the TabController.
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_animationController = null;
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dispose();
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return newController;
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}
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/// An animation whose value represents the current position of the [TabBar]'s
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@ -485,7 +498,7 @@ class _DefaultTabControllerState extends State<DefaultTabController> with Single
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newIndex = math.max(0, widget.length - 1);
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previousIndex = _controller.index;
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}
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_controller = _controller._copyWith(
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_controller = _controller._copyWithAndDispose(
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length: widget.length,
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animationDuration: widget.animationDuration,
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index: newIndex,
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@ -494,7 +507,7 @@ class _DefaultTabControllerState extends State<DefaultTabController> with Single
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}
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if (oldWidget.animationDuration != widget.animationDuration) {
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_controller = _controller._copyWith(
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_controller = _controller._copyWithAndDispose(
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length: widget.length,
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animationDuration: widget.animationDuration,
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index: _controller.index,
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