How to fast reorder child elements in flex 4?

I have a control which contains many child elements (about 1000), and I ne开发者_StackOverflow中文版ed to sort them.

Now I doing that like this:

_elements.sortOn(...);

for (var i: int = 0; i < _elements.length; i++) {
    setItemIndex(_childItems[_elements[i].id], i);
}

• _childElement - object that contains UI-child elements, which i need to sort (key of the dictionary is an identifier from data-object
• _elements - array contains data-objects

But this is too slow! How to reorder the childs by my criteria as fast as possible?

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I don't have enough info to be sure my answer is correct but... if "_elements" is an arraycollection and it's bound to the control as dataprovider

somethink like < ns:mycontrol dataProvider="{_elements}"/>

each time you change "_elements" the binding makes the control parse and render the data in the dataprovider, so, for a list 1000+ long it's going to be painful.

in this case I'd storethe _elements array (the data of the array collection) in a tmp variable and replace it with a new blank array. then do all your sorting stuff on the tmp and set it back again as the _elements data. by doing this you're just forcing parsing and rendering twice...not 1000+ times :)

my 2 cents, ciao