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NestedScrollView: extended nested scroll view to fix following issues.

1.pinned sliver header issue

2.inner scrollables in tabview sync issue

3.do without ScrollController in NestedScrollView's body

Web demo for ExtendedNestedScrollView

Example for issue 1

give total height of pinned sliver headers in pinnedHeaderSliverHeightBuilder callback

 var tabBarHeight = primaryTabBar.preferredSize.height;
      var pinnedHeaderHeight =
          //statusBar height
          statusBarHeight +
              //pinned SliverAppBar height in header

        pinnedHeaderSliverHeightBuilder: () {
          return pinnedHeaderHeight;
       )   ,

Example for issue 2

We usually keep list scroll position with following:

AutomaticKeepAliveClientMixintrueScrollPosition will not be disposed, set onlyOneScrollInBody to true so that we can know which list is isActived.
PageStorageKeyfalseScrollPosition will be disposed, PageStorageKey just record the position info,the scroll positions in ExtendedNestedScrollView will always single one.
       onlyOneScrollInBody: true,


Provide ExtendedVisibilityDetector to point out which list is visible

      uniqueKey: const Key('Tab1'),
      child: ListView(),

Do without ScrollController in NestedScrollView's body

  • due to we can't set ScrollController for list in NestedScrollView's body(it will breaking behaviours of InnerScrollController in NestedScrollView),provide Demos

  • pull to refresh

  • load more

  • scroll to top

    show how to do it without ScrollController