如何在Flutter中检测ListView的滚动位置 [英] How to detect scroll position of ListView in Flutter

问题描述

我正在使用 ListView 小部件将项目显示为列表.在三个窗口中，查看项目必须将中间项目放置在中间.

I'm using ListView widget to show items as a list. In a window three, items viewing must the middle item place in the middle.

那么在滚动停止时如何检测 ListView 的位置?

So how can I detect position of ListView when scrolling stop?

如何检测ListView滚动停止?

How to detect ListView Scrolling stopped?

推荐答案

我使用了 NotificationListener ，它是一个小部件，用于监听气泡冒泡的通知.然后使用 ScrollEndNotification ，这表明滚动已停止.

I used NotificationListener that is a widget that listens for notifications bubbling up the tree. Then use ScrollEndNotification, which indicates that scrolling has stopped.

对于滚动位置，我使用了 _scrollController ，其类型为 ScrollController .

For scroll position I used _scrollController that type is ScrollController.

new NotificationListener(
  child: new ListView(
    controller: _scrollController,
    children: ...
  ),
  onNotification: (t) {
    if (t is ScrollEndNotification) {
      print(_scrollController.position.pixels);
    }
  },
),

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