Flutter:如何避免ListView动态滚动(或更改其物理特性) [英] Flutter: How to avoid ListView to scroll (or change its physics) dynamically

问题描述

我有一个 ListView 小部件，我希望允许它是可滚动的还是基于某种逻辑的.

I have a ListView widget and i would like to allow it to be scrollable or not based on some logic.

NeverScrollableScrollPhysics 阻止滚动，但是由于物理参数是最终的之后就无法更改.

NeverScrollableScrollPhysics prevents scrolling, but since physics parameter is final i can't change it afterwards.

我本以为可以使用状态来通过不同的物理学来重建ListView，但是我想这是一个相当繁重的操作，可以重建整个ListView.

I thought to use state to rebuild the ListView using different physics, but i guess is a quite heavy operation to rebuild the entirely ListView.

有人知道或如何处理这种情况，在这种情况下，用户在完成其他用户操作之前不应该滚动ListView?

Does anyone knows or how to deal with this situation, where the user should not scroll a ListView until other user action got accomplished?

推荐答案

您可以在ListView中有条件地应用物理学:

You can apply the physics conditionally in your ListView:

shrinkWrap: true,
physics: !isScrolable? const NeverScrollableScrollPhysics(): 
         const AlwaysScrollableScrollPhysics(),

然后，在需要时可以更改状态以修改变量的值.

Then when you need you can change the state modifying the value of your variable.

setState(() {
    isScrolable = !isScrolable;
}); 

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