Flex 4 List - 拖放问题

发布于 2024-10-21 23:08:02 字数 1124 浏览 5 评论 0原文

我有两个不同的 Spark Lists，有两个不同的 ItemRenderer，其中一个带有 dragEnabled="true"，另一个带有 dropEnabled ="true"，这样每当我从一个列表拖放到另一个列表中时，就会创建所删除对象的副本并将其插入到第二个列表的 dataProvider 中。

<s:List id="source"
        itemRenderer="componentsRenderers.SourceItemRenderer"
        dragEnabled="true"
        dataProvider="{elements}"/>

<s:List id="destination"
        itemRenderer="componentsRenderers.DestinationItemRenderer"
        dragEnabled="false"
        dropEnabled="true"
        change="destinationChanged(event)"/>

事件处理程序 destinationChanged() 是一种方法，用于解析最近添加的对象、将其删除并创建一个新对象，该新对象除其他外，还具有一个 UIComponent ，该对象必须被渲染。

这个洞的东西工作得很好，除了一件事：一旦我加载应用程序，要放到 destination 中的第一个项目的 UIComponent 就永远不会获得渲染器。完整的对象就在那里，并且与其相关的所有其他功能都可以工作，但组件不会被渲染。如果我删除该对象，使列表再次为空，然后再次插入它，它就会被渲染！

另外，插入“不可见”的插入后，以下所有插入都将起作用。

有想法吗？谢谢！

Update: I just found out that the itemRenderer DestinationItemRenderer gets rendered twice for the first element to be dropped.

原文

I have two different Spark Lists, with two different ItemRenderers, one of them with dragEnabled="true" and the other with dropEnabled="true", in such a way that whenever I drag from one and drop in the other, a copy of the object dropped is created and inserted in the second List's dataProvider.

<s:List id="source"
        itemRenderer="componentsRenderers.SourceItemRenderer"
        dragEnabled="true"
        dataProvider="{elements}"/>

<s:List id="destination"
        itemRenderer="componentsRenderers.DestinationItemRenderer"
        dragEnabled="false"
        dropEnabled="true"
        change="destinationChanged(event)"/>

The event handler destinationChanged() is a method that parses the recently added object, removes it, and creates a new one that, among other stuff, has an UIComponent that has to be rendered.

The hole thing works well, except by one thing: as soon as the I load the application, the UIComponent of the first item to be dropped in destination never gets renderer. The full object is there and all the other functionalities related to it work, but the component doesn't get rendered. If I delete the object, making the List empty again, and insert it again, it gets rendered!

Also, after inserting the 'invisible' one, all the following inserts works.

Ideas?
Thanks!

Update: I just found out that the itemRenderer DestinationItemRenderer gets rendered twice for the first element to be dropped.

分享到QQ

分享到微博