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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

• extended_nested_scroll_view
• Example for issue 1
• Example for issue 2
• Do without ScrollController in NestedScrollView's body

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
              kToolbarHeight;

    ExtendedNestedScrollView(
        pinnedHeaderSliverHeightBuilder: () {
          return pinnedHeaderHeight;
        }
       )   ,
       

    ExtendedNestedScrollView(
       onlyOneScrollInBody: true,
    )

• 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

• pinned header height

  show how to change pinned header height dynamically.