extended_nested_scroll_view

pub package GitHub stars GitHub forks GitHub license GitHub issues flutter-candies

Language: English | 中文简体

NestedScrollView: extended nested scroll view to fix following issues.

1.pinned sliver header issue

2.inner scrollables in tabview sync issue

3.pull to refresh is not work.

4.do without ScrollController in NestedScrollView's body

Chinese blog

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
              kToolbarHeight;

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

Example for issue 2

Step1

Put your list which in tabview into NestedScrollViewInnerScrollPositionKeyWidget,and get unique a key

 return extended.NestedScrollViewInnerScrollPositionKeyWidget(
        widget.tabKey,
        ListView.builder(
            itemBuilder: (c, i) {
              return Container(
                alignment: Alignment.center,
                height: 60.0,
                child: Text(widget.tabKey.toString() + ": List$i"),
              );
            },
            itemCount: 100)
        );

Step2

get current tab key in innerScrollPositionKeyBuilder callback. this key should as same as in step 1 given.

 extended.NestedScrollView(
        innerScrollPositionKeyBuilder: () {
          var index = "Tab";
          if (primaryTC.index == 0) {
            index +=
                (primaryTC.index.toString() + secondaryTC.index.toString());
          } else {
            index += primaryTC.index.toString();
          }
          return Key(index);
        },

Example for NestedScrollView pull to refresh

NestedScrollViewRefreshIndicator is as the same as Flutter RefreshIndicator.

 NestedScrollViewRefreshIndicator(
       onRefresh: onRefresh,
       child: extended.NestedScrollView(
         headerSliverBuilder: (c, f) {
           return _buildSliverHeader(primaryTabBar);
         },

Better one to pull to refresh

Please see the example app of this for a full example.

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

    to show how to do it without ScrollController

Libraries

extended_nested_scroll_view