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1、监听滚动视图中正在显示的子部件
sliverListContexts 否 该回调中返回需要被观察的 ListView 的 BuildContext,在需要精确指定 BuildContext 时才会用到该参数 onObserve 否 该回调可以监听到当前 第一个 Sliver 中正在显示中的子部件的相关信息 onObserveAll 否 该回调可以监听到当前 所有 Sliver 正在显示中的子部件 ...
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