相当于Flutter中的Android RecyclerView.SCROLL_STATE_IDLE [英] What is the equivalent of Android's RecyclerView.SCROLL_STATE_IDLE in Flutter

问题描述

Android提供类似于RecyclerView.SCROLL_STATE_IDLE的滚动状态，该状态指示用户何时停止滚动.我无法在Pageview或ListView ScrollListener的颤振中找到任何替代.

Android gives scroll states like RecyclerView.SCROLL_STATE_IDLE which tells when user stops the scroll. I'm not able to find any alternative in flutter for Pageview or ListView ScrollListener.

我需要检测PageView中的向上/向下滚动，以基于此执行一些操作. Flutter提供了方向(_myPageViewController.position.userScrollDirection)，但提供了连续的回调.我只需要在用户停止滚动时才能检测到它.

I need to detect scroll up/down in PageView to perform some operation based on that. Flutter gives the direction (_myPageViewController.position.userScrollDirection) but it gives a continuous callback. I need to detect it only when the user stops scrolling.

我需要在listView中自动播放视频.因此，我需要检测用户何时停止滚动，然后获取位置并进行播放.

I need to do auto-play videos in a listView. So I need to detect when the user stops scrolling and then get the position and play that.

在android中，我会使用RecyclerView's scrollListener中的帮助RecyclerView.SCROLL_STATE_IDLE状态来完成此操作.需要一些类似的东西.

In android I would have done this with the help RecyclerView.SCROLL_STATE_IDLE state in RecyclerView's scrollListener. Need something similar in flutter.

推荐答案

根据 @pskink 和@doc NotificationListener<ScrollNotification>给出了滚动开始，滚动结束的回调.

According to @pskink and @doc NotificationListener<ScrollNotification> gives the callback of scroll start, scroll end.

NotificationListener<ScrollNotification>(
  onNotification: (scrollNotification) {
    if (scrollNotification is ScrollEndNotification) {
      print("Scroll End"); //Scroll end callback
     }
    return false;
    },
  child: ListView.builder(
      //...
      ),
)

这也可以与其他可滚动小部件(例如PageView)一起使用.

This also works with other scrollable widgets like PageView.

这篇关于相当于Flutter中的Android RecyclerView.SCROLL_STATE_IDLE的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！