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Fix sample code (#67940)
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Kate Lovett
GitHub
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9464661a98
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@ -61,7 +61,7 @@ typedef NestedScrollViewHeaderSliversBuilder = List<Widget> Function(BuildContex
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/// (those inside the [TabBarView], hooking them together so that they appear,
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/// to the user, as one coherent scroll view.
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///
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/// {@tool sample --template=stateless_widget_scaffold}
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/// {@tool sample --template=stateless_widget_material}
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///
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/// This example shows a [NestedScrollView] whose header is the combination of a
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/// [TabBar] in a [SliverAppBar] and whose body is a [TabBarView]. It uses a
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@ -76,101 +76,103 @@ typedef NestedScrollViewHeaderSliversBuilder = List<Widget> Function(BuildContex
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/// final List<String> _tabs = ['Tab 1', 'Tab 2'];
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/// return DefaultTabController(
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/// length: _tabs.length, // This is the number of tabs.
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/// child: NestedScrollView(
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/// headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
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/// // These are the slivers that show up in the "outer" scroll view.
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/// return <Widget>[
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/// SliverOverlapAbsorber(
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/// // This widget takes the overlapping behavior of the SliverAppBar,
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/// // and redirects it to the SliverOverlapInjector below. If it is
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/// // missing, then it is possible for the nested "inner" scroll view
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/// // below to end up under the SliverAppBar even when the inner
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/// // scroll view thinks it has not been scrolled.
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/// // This is not necessary if the "headerSliverBuilder" only builds
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/// // widgets that do not overlap the next sliver.
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/// handle: NestedScrollView.sliverOverlapAbsorberHandleFor(context),
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/// sliver: SliverAppBar(
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/// title: const Text('Books'), // This is the title in the app bar.
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/// pinned: true,
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/// expandedHeight: 150.0,
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/// // The "forceElevated" property causes the SliverAppBar to show
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/// // a shadow. The "innerBoxIsScrolled" parameter is true when the
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/// // inner scroll view is scrolled beyond its "zero" point, i.e.
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/// // when it appears to be scrolled below the SliverAppBar.
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/// // Without this, there are cases where the shadow would appear
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/// // or not appear inappropriately, because the SliverAppBar is
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/// // not actually aware of the precise position of the inner
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/// // scroll views.
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/// forceElevated: innerBoxIsScrolled,
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/// bottom: TabBar(
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/// // These are the widgets to put in each tab in the tab bar.
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/// tabs: _tabs.map((String name) => Tab(text: name)).toList(),
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/// child: Scaffold(
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/// body: NestedScrollView(
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/// headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
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/// // These are the slivers that show up in the "outer" scroll view.
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/// return <Widget>[
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/// SliverOverlapAbsorber(
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/// // This widget takes the overlapping behavior of the SliverAppBar,
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/// // and redirects it to the SliverOverlapInjector below. If it is
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/// // missing, then it is possible for the nested "inner" scroll view
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/// // below to end up under the SliverAppBar even when the inner
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/// // scroll view thinks it has not been scrolled.
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/// // This is not necessary if the "headerSliverBuilder" only builds
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/// // widgets that do not overlap the next sliver.
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/// handle: NestedScrollView.sliverOverlapAbsorberHandleFor(context),
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/// sliver: SliverAppBar(
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/// title: const Text('Books'), // This is the title in the app bar.
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/// pinned: true,
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/// expandedHeight: 150.0,
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/// // The "forceElevated" property causes the SliverAppBar to show
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/// // a shadow. The "innerBoxIsScrolled" parameter is true when the
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/// // inner scroll view is scrolled beyond its "zero" point, i.e.
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/// // when it appears to be scrolled below the SliverAppBar.
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/// // Without this, there are cases where the shadow would appear
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/// // or not appear inappropriately, because the SliverAppBar is
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/// // not actually aware of the precise position of the inner
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/// // scroll views.
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/// forceElevated: innerBoxIsScrolled,
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/// bottom: TabBar(
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/// // These are the widgets to put in each tab in the tab bar.
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/// tabs: _tabs.map((String name) => Tab(text: name)).toList(),
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/// ),
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/// ),
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/// ),
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/// ),
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/// ];
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/// },
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/// body: TabBarView(
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/// // These are the contents of the tab views, below the tabs.
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/// children: _tabs.map((String name) {
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/// return SafeArea(
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/// top: false,
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/// bottom: false,
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/// child: Builder(
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/// // This Builder is needed to provide a BuildContext that is
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/// // "inside" the NestedScrollView, so that
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/// // sliverOverlapAbsorberHandleFor() can find the
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/// // NestedScrollView.
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/// builder: (BuildContext context) {
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/// return CustomScrollView(
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/// // The "controller" and "primary" members should be left
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/// // unset, so that the NestedScrollView can control this
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/// // inner scroll view.
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/// // If the "controller" property is set, then this scroll
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/// // view will not be associated with the NestedScrollView.
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/// // The PageStorageKey should be unique to this ScrollView;
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/// // it allows the list to remember its scroll position when
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/// // the tab view is not on the screen.
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/// key: PageStorageKey<String>(name),
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/// slivers: <Widget>[
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/// SliverOverlapInjector(
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/// // This is the flip side of the SliverOverlapAbsorber
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/// // above.
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/// handle: NestedScrollView.sliverOverlapAbsorberHandleFor(context),
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/// ),
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/// SliverPadding(
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/// padding: const EdgeInsets.all(8.0),
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/// // In this example, the inner scroll view has
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/// // fixed-height list items, hence the use of
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/// // SliverFixedExtentList. However, one could use any
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/// // sliver widget here, e.g. SliverList or SliverGrid.
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/// sliver: SliverFixedExtentList(
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/// // The items in this example are fixed to 48 pixels
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/// // high. This matches the Material Design spec for
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/// // ListTile widgets.
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/// itemExtent: 48.0,
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/// delegate: SliverChildBuilderDelegate(
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/// (BuildContext context, int index) {
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/// // This builder is called for each child.
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/// // In this example, we just number each list item.
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/// return ListTile(
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/// title: Text('Item $index'),
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/// );
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/// },
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/// // The childCount of the SliverChildBuilderDelegate
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/// // specifies how many children this inner list
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/// // has. In this example, each tab has a list of
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/// // exactly 30 items, but this is arbitrary.
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/// childCount: 30,
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/// ];
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/// },
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/// body: TabBarView(
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/// // These are the contents of the tab views, below the tabs.
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/// children: _tabs.map((String name) {
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/// return SafeArea(
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/// top: false,
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/// bottom: false,
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/// child: Builder(
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/// // This Builder is needed to provide a BuildContext that is
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/// // "inside" the NestedScrollView, so that
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/// // sliverOverlapAbsorberHandleFor() can find the
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/// // NestedScrollView.
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/// builder: (BuildContext context) {
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/// return CustomScrollView(
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/// // The "controller" and "primary" members should be left
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/// // unset, so that the NestedScrollView can control this
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/// // inner scroll view.
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/// // If the "controller" property is set, then this scroll
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/// // view will not be associated with the NestedScrollView.
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/// // The PageStorageKey should be unique to this ScrollView;
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/// // it allows the list to remember its scroll position when
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/// // the tab view is not on the screen.
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/// key: PageStorageKey<String>(name),
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/// slivers: <Widget>[
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/// SliverOverlapInjector(
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/// // This is the flip side of the SliverOverlapAbsorber
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/// // above.
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/// handle: NestedScrollView.sliverOverlapAbsorberHandleFor(context),
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/// ),
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/// SliverPadding(
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/// padding: const EdgeInsets.all(8.0),
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/// // In this example, the inner scroll view has
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/// // fixed-height list items, hence the use of
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/// // SliverFixedExtentList. However, one could use any
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/// // sliver widget here, e.g. SliverList or SliverGrid.
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/// sliver: SliverFixedExtentList(
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/// // The items in this example are fixed to 48 pixels
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/// // high. This matches the Material Design spec for
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/// // ListTile widgets.
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/// itemExtent: 48.0,
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/// delegate: SliverChildBuilderDelegate(
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/// (BuildContext context, int index) {
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/// // This builder is called for each child.
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/// // In this example, we just number each list item.
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/// return ListTile(
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/// title: Text('Item $index'),
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/// );
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/// },
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/// // The childCount of the SliverChildBuilderDelegate
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/// // specifies how many children this inner list
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/// // has. In this example, each tab has a list of
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/// // exactly 30 items, but this is arbitrary.
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/// childCount: 30,
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/// ),
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/// ),
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/// ),
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/// ),
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/// ],
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/// );
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/// },
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/// ),
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/// );
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/// }).toList(),
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/// ],
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/// );
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/// },
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/// ),
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/// );
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/// }).toList(),
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/// ),
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/// ),
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/// ),
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/// );
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