本文介绍了找出 ListView 中的哪些项目是可见的的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如何在 ListView
中找出当前 visible
或 invisible
的项目?
例如,我在 ListView
中有 100 个项目,当我滚动到屏幕或列表顶部时,我想检测哪些项目从视口中出现或消失.
插图:
解决方案
你也可以使用
How can I find out which items are currently visible
or invisible
in a ListView
?
For example, I have 100 items in ListView
and when i scroll to top of screen or list, I want to detect which items appear or disappear from the viewport.
Illustration:
解决方案
You can also use inview_notifier_list. It's basically a normal ListView which defines a visible region and it's children get notified when they are in that region.
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