flutter 当在NestedScrollView中滚动第一页时,第二页也会滚动到SliverPersistentHeader下面

soat7uwm  于 2023-05-01  发布在  Flutter
关注(0)|答案(1)|浏览(262)

我有这样的NestedScrollView:

headers: [
  SliverToBox(), // This scrolls away
  SliverPersistentHeader(), // This needs to pin
]
body: TabBarView() // Classic TabBar view with multiple pages

这是它看起来unscrolled:

这是我开始滚动第一页时的样子(到目前为止都很好):

这是当我滑动到下一个标签时的样子。请注意,下一页已经滚动了一点(从2开始,它应该从0开始)。不同之处在于PersistentSliverHeader的高度,基本上第二个页面会滚动到标题下面。如何使第1页的滚动条不影响第2页的滚动条?

代码:这里是Gist,不幸的是它不工作在web/dartpad,但在移动的运行没有问题:https://gist.github.com/itsJoKr/eca5b57c2f290f517862dcd118a16d4d

lhcgjxsq

lhcgjxsq1#

答案是使用SliverOverlapAbsorber

SliverOverlapAbsorber(
                handle: NestedScrollView.sliverOverlapAbsorberHandleFor(context),
                sliver: SliverPersistentHeader(
                  pinned: true,
                  delegate: ChipTabBarSliverDelegate2(
                    tabController,
                    [
                      'tab 1',
                      'tab 2',
                      'tab 3',
                    ],
                    MediaQuery.of(context).padding.top,
                  ),
                ),
              ),

钥匙这是手柄。正如文档中所说:

// 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.

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