[How to use] 这个好像对WaterfallFlow不起作用

[chenxuyuan2016]

Platforms

Android, iOS

Description

我看例子也没有对WaterfallFlow的使用，调用了jumpTo方法，但是界面上面一点响应都没有

My code

ScrollController scrollController = ScrollController();
SliverObserverController gridObserverController = SliverObserverController(controller: scrollController);

Widget createList() {
return SliverViewObserver(
controller: gridObserverController,
child: WaterfallFlow.builder(
controller: scrollController,
itemCount: state.length,
padding: EdgeInsets.symmetric(horizontal: 10.w),
gridDelegate: SliverWaterfallFlowDelegateWithFixedCrossAxisCount(
crossAxisCount: 2,
mainAxisSpacing: 2.w,
crossAxisSpacing: 2.w,
),
itemBuilder: (BuildContext context, int index) {
return GestureDetector(
behavior: HitTestBehavior.deferToChild,
onTap: () => _cardClick(context, index),
child: Hero(
tag: "$squareId:card:$index",
child: SquareCard(state.squareId, state.getItem(index), index,
_devicesClick, _heartLikeClick)),
);
},
),
);
}

 `gridObserverController.jumpTo(index: state.currentIndex, renderSliverType: ObserverRenderSliverType.grid,);`

Try do it

No response

[LinXunFeng]

针对第三方滚动视图，需要告诉 scrollview_observer 如何处理观察

• 1.5、customHandleObserve 回调
• 1.6、extendedHandleObserve 回调

flutter_scrollview_observer/example/lib/features/scene/waterfall_flow_demo/waterfall_flow_page.dart

Lines 45 to 66 in a4794ef

	extendedHandleObserve: (context) {
	// An extension of the original observation logic.
	final _obj = ObserverUtils.findRenderObject(context);
	if (_obj is RenderSliverWaterfallFlow) {
	return ObserverCore.handleGridObserve(
	context: context,
	fetchLeadingOffset: () => observeOffset,
	);
	}
	return null;
	},
	// customHandleObserve: (context) {
	// // Here you can customize the observation logic.
	// final _obj = ObserverUtils.findRenderObject(context);
	// if (_obj is RenderSliverList) {
	// ObserverCore.handleListObserve(context: context);
	// }
	// if (_obj is RenderSliverGrid || _obj is RenderSliverWaterfallFlow) {
	// return ObserverCore.handleGridObserve(context: context);
	// }
	// return null;
	// },