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Description:

extended nested scroll view

extended_nested_scroll_view #

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.do without ScrollController in NestedScrollView's body
Web demo for ExtendedNestedScrollView

extended_nested_scroll_view
Example for issue 1
Example for issue 2

ExtendedVisibilityDetector

Do without ScrollController in NestedScrollView's body

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;

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

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Example for issue 2 #
We usually keep list scroll position with following:

scene
onlyOneScrollInBody
description

AutomaticKeepAliveClientMixin
true
ScrollPosition will not be disposed, set onlyOneScrollInBody to true so that we can know which list is isActived.

PageStorageKey
false
ScrollPosition will be disposed, PageStorageKey just record the position info,the scroll positions in ExtendedNestedScrollView will always single one.

ExtendedNestedScrollView(
onlyOneScrollInBody: true,
)
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ExtendedVisibilityDetector #
Provide ExtendedVisibilityDetector to point out which list is visible
ExtendedVisibilityDetector(
uniqueKey: const Key('Tab1'),
child: ListView(),
)
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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

pinned header height
show how to change pinned header height dynamically.