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Unverified Commit 9464661a authored by Kate Lovett's avatar Kate Lovett Committed by GitHub
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Fix sample code (#67940)

parent 7f1540f3
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packages/flutter/lib/src/widgets/nested_scroll_view.dart
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......@@ -61,7 +61,7 @@ typedef NestedScrollViewHeaderSliversBuilder = List<Widget> Function(BuildContex
/// (those inside the [TabBarView], hooking them together so that they appear,
/// to the user, as one coherent scroll view.
///
/// {@tool sample --template=stateless_widget_scaffold}
/// {@tool sample --template=stateless_widget_material}
///
/// This example shows a [NestedScrollView] whose header is the combination of a
/// [TabBar] in a [SliverAppBar] and whose body is a [TabBarView]. It uses a
......@@ -76,101 +76,103 @@ typedef NestedScrollViewHeaderSliversBuilder = List<Widget> Function(BuildContex
/// final List<String> _tabs = ['Tab 1', 'Tab 2'];
/// return DefaultTabController(
/// length: _tabs.length, // This is the number of tabs.
/// child: NestedScrollView(
/// headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
/// // These are the slivers that show up in the "outer" scroll view.
/// return <Widget>[
/// SliverOverlapAbsorber(
/// // This widget takes the overlapping behavior of the SliverAppBar,
/// // and redirects it to the SliverOverlapInjector below. If it is
/// // missing, then it is possible for the nested "inner" scroll view
/// // below to end up under the SliverAppBar even when the inner
/// // scroll view thinks it has not been scrolled.
/// // This is not necessary if the "headerSliverBuilder" only builds
/// // widgets that do not overlap the next sliver.
/// handle: NestedScrollView.sliverOverlapAbsorberHandleFor(context),
/// sliver: SliverAppBar(
/// title: const Text('Books'), // This is the title in the app bar.
/// pinned: true,
/// expandedHeight: 150.0,
/// // The "forceElevated" property causes the SliverAppBar to show
/// // a shadow. The "innerBoxIsScrolled" parameter is true when the
/// // inner scroll view is scrolled beyond its "zero" point, i.e.
/// // when it appears to be scrolled below the SliverAppBar.
/// // Without this, there are cases where the shadow would appear
/// // or not appear inappropriately, because the SliverAppBar is
/// // not actually aware of the precise position of the inner
/// // scroll views.
/// forceElevated: innerBoxIsScrolled,
/// bottom: TabBar(
/// // These are the widgets to put in each tab in the tab bar.
/// tabs: _tabs.map((String name) => Tab(text: name)).toList(),
/// child: Scaffold(
/// body: NestedScrollView(
/// headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
/// // These are the slivers that show up in the "outer" scroll view.
/// return <Widget>[
/// SliverOverlapAbsorber(
/// // This widget takes the overlapping behavior of the SliverAppBar,
/// // and redirects it to the SliverOverlapInjector below. If it is
/// // missing, then it is possible for the nested "inner" scroll view
/// // below to end up under the SliverAppBar even when the inner
/// // scroll view thinks it has not been scrolled.
/// // This is not necessary if the "headerSliverBuilder" only builds
/// // widgets that do not overlap the next sliver.
/// handle: NestedScrollView.sliverOverlapAbsorberHandleFor(context),
/// sliver: SliverAppBar(
/// title: const Text('Books'), // This is the title in the app bar.
/// pinned: true,
/// expandedHeight: 150.0,
/// // The "forceElevated" property causes the SliverAppBar to show
/// // a shadow. The "innerBoxIsScrolled" parameter is true when the
/// // inner scroll view is scrolled beyond its "zero" point, i.e.
/// // when it appears to be scrolled below the SliverAppBar.
/// // Without this, there are cases where the shadow would appear
/// // or not appear inappropriately, because the SliverAppBar is
/// // not actually aware of the precise position of the inner
/// // scroll views.
/// forceElevated: innerBoxIsScrolled,
/// bottom: TabBar(
/// // These are the widgets to put in each tab in the tab bar.
/// tabs: _tabs.map((String name) => Tab(text: name)).toList(),
/// ),
/// ),
/// ),
/// ),
/// ];
/// },
/// body: TabBarView(
/// // These are the contents of the tab views, below the tabs.
/// children: _tabs.map((String name) {
/// return SafeArea(
/// top: false,
/// bottom: false,
/// child: Builder(
/// // This Builder is needed to provide a BuildContext that is
/// // "inside" the NestedScrollView, so that
/// // sliverOverlapAbsorberHandleFor() can find the
/// // NestedScrollView.
/// builder: (BuildContext context) {
/// return CustomScrollView(
/// // The "controller" and "primary" members should be left
/// // unset, so that the NestedScrollView can control this
/// // inner scroll view.
/// // If the "controller" property is set, then this scroll
/// // view will not be associated with the NestedScrollView.
/// // The PageStorageKey should be unique to this ScrollView;
/// // it allows the list to remember its scroll position when
/// // the tab view is not on the screen.
/// key: PageStorageKey<String>(name),
/// slivers: <Widget>[
/// SliverOverlapInjector(
/// // This is the flip side of the SliverOverlapAbsorber
/// // above.
/// handle: NestedScrollView.sliverOverlapAbsorberHandleFor(context),
/// ),
/// SliverPadding(
/// padding: const EdgeInsets.all(8.0),
/// // In this example, the inner scroll view has
/// // fixed-height list items, hence the use of
/// // SliverFixedExtentList. However, one could use any
/// // sliver widget here, e.g. SliverList or SliverGrid.
/// sliver: SliverFixedExtentList(
/// // The items in this example are fixed to 48 pixels
/// // high. This matches the Material Design spec for
/// // ListTile widgets.
/// itemExtent: 48.0,
/// delegate: SliverChildBuilderDelegate(
/// (BuildContext context, int index) {
/// // This builder is called for each child.
/// // In this example, we just number each list item.
/// return ListTile(
/// title: Text('Item $index'),
/// );
/// },
/// // The childCount of the SliverChildBuilderDelegate
/// // specifies how many children this inner list
/// // has. In this example, each tab has a list of
/// // exactly 30 items, but this is arbitrary.
/// childCount: 30,
/// ];
/// },
/// body: TabBarView(
/// // These are the contents of the tab views, below the tabs.
/// children: _tabs.map((String name) {
/// return SafeArea(
/// top: false,
/// bottom: false,
/// child: Builder(
/// // This Builder is needed to provide a BuildContext that is
/// // "inside" the NestedScrollView, so that
/// // sliverOverlapAbsorberHandleFor() can find the
/// // NestedScrollView.
/// builder: (BuildContext context) {
/// return CustomScrollView(
/// // The "controller" and "primary" members should be left
/// // unset, so that the NestedScrollView can control this
/// // inner scroll view.
/// // If the "controller" property is set, then this scroll
/// // view will not be associated with the NestedScrollView.
/// // The PageStorageKey should be unique to this ScrollView;
/// // it allows the list to remember its scroll position when
/// // the tab view is not on the screen.
/// key: PageStorageKey<String>(name),
/// slivers: <Widget>[
/// SliverOverlapInjector(
/// // This is the flip side of the SliverOverlapAbsorber
/// // above.
/// handle: NestedScrollView.sliverOverlapAbsorberHandleFor(context),
/// ),
/// SliverPadding(
/// padding: const EdgeInsets.all(8.0),
/// // In this example, the inner scroll view has
/// // fixed-height list items, hence the use of
/// // SliverFixedExtentList. However, one could use any
/// // sliver widget here, e.g. SliverList or SliverGrid.
/// sliver: SliverFixedExtentList(
/// // The items in this example are fixed to 48 pixels
/// // high. This matches the Material Design spec for
/// // ListTile widgets.
/// itemExtent: 48.0,
/// delegate: SliverChildBuilderDelegate(
/// (BuildContext context, int index) {
/// // This builder is called for each child.
/// // In this example, we just number each list item.
/// return ListTile(
/// title: Text('Item $index'),
/// );
/// },
/// // The childCount of the SliverChildBuilderDelegate
/// // specifies how many children this inner list
/// // has. In this example, each tab has a list of
/// // exactly 30 items, but this is arbitrary.
/// childCount: 30,
/// ),
/// ),
/// ),
/// ),
/// ],
/// );
/// },
/// ),
/// );
/// }).toList(),
/// ],
/// );
/// },
/// ),
/// );
/// }).toList(),
/// ),
/// ),
/// ),
/// );
......
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