我如何检测拖放操作结束？ [英] How do I detect that Drag and Drop operation ended?

问题描述

这是参照<一个href="http://stackoverflow.com/questions/2105579/flex-tree-droplocation-indicator-stuck-edit-2-4-10-almost-a-totaly-different-qu">My其他问题

如何可以为您检测和调度事件时，拖放操作结束prematurely？ 我需要知道用户不再拖动某一项。即使的DragDrop和dragComplete事件做无火灾。它几乎一样，如果我需要一个事件侦听器添加到DragManager的，但是这不是真的有可能......是什么呢？

How do can you detect and dispatch an event when a drag and drop operation ends prematurely? I need to know that the user is no longer dragging an item. Even if the dragDrop and dragComplete events do no fire. Its almost as if I need to add an event listener to the dragManager, but that's not really possible... is it?

推荐答案

看起来基本上你需要能够告诉如果DragManager的胡扯出来。即使是在拖/放系统的错误事件（没有，我已经看到，但也许我错过了一些明显的），你可能不能总是指望它。

It looks like basically you need to be able to tell if the DragManager craps out. Even if there was an ERROR event in the drag/drop system (there isn't that I've seen, but maybe I've missed something obvious), you probably couldn't always count on it.

有点像试图建立一个客户知道什么时候服务器已经死了之类的话，是吗？

Sort of like trying to set up a client to know when the server has died kind of thing, yeah?

我可能是遥远，但我想，当你开始你拖，你可以添加的mouseMove侦听器，并不断检查，看看是否你还在拖着。我相信你可以动态地设置多久的mouseMove事件触发。

I may be way off, but I'm thinking you could add a mouseMove listener when you begin your drag and constantly check to see if you are still dragging. I believe you can dynamically set how often that mouseMove event fires.

和，当然，一旦你完成了拖 - 无论成熟或prematurely - 删除鼠标移动监听器

And, of course, once you complete the drag - whether maturely or prematurely - remove the mouseMove listener.

我真的不是疯了做这样的事情。添加一个保姆的工作。但我认为它会做需要做的，我不认为它需要是混乱。

I'm really not crazy about doing something like this. Adding a babysitter to an operation. But I think it'd do what needs doing, and I don't think it needs to be messy.

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