CODEWITHSUNDEEP
apache-flexactionscriptarraycollection
Dukeatcoding
Dukeatcoding

Reputation: 1393

Iterating over ArrayCollection while adding and removing items

I want to iterate over an ArrayCollection in Flex while there can be items added and removed.

Since i didn't find a way to use a "classic" Iterator like in Java, which would do the job. I tried the Cursor. But it doesn't really work the way i want it to be ;) So how do I do it nicely ?


    var cursor:IViewCursor = workingStack.createCursor();

    while (!cursor.afterLast)
    {
        // Search
                    deepFirstSearchModified(cursor.current.node,nodeB,cursor.current.way);
        // Delete Node
        cursor.remove();
        // Next Node
        cursor.moveNext();

    }

Upvotes: 3

Views: 11540

Answers (5)

artaxerxe
artaxerxe

Reputation: 6411

In flex (or actionscript) any change that you do, is visible instantly. So you can do what you want in a for:

    for (var i : Number = myArrayCollection.length; i > 0; i--) {
       myArrayCollection.removeItemAt(i - 1);
    }

I think that should work fine.

Upvotes: -1

Constantiner
Constantiner

Reputation: 14221

Try to use the following:

for (var i:int = myArrayCollection.length - 1; i >= 0; i--) {
   myArrayCollection.removeItemAt(i);
}

Upvotes: 2

Brian Genisio
Brian Genisio

Reputation: 48127

Take a look at ActionLinq. It implements the .Net Linq2Objects pattern, including IEnumerable. Of course, you need to be careful, because you are modifying the items you are iterating over...

var workingStack:ArrayCollection = getData();
var iterator:IEnumerable = Enumerable.from(workingStack);

for each(var item:String in iterator) {
  doSomethingTo(workingStack);
}

Upvotes: 0

Imran
Imran

Reputation: 3024

I think better to use New Collection/Array for opertations as

private function parseSelectedItem(value:IListViewCollection):IListViewCollection{
 var result:Array = new Array();
    for each(var item:Object in value)
    {
        //result.push();
        //result.pop();
    }
    return new ArrayCollection(result) ;
}

Hopes that helps

Upvotes: 3

Dennis Jaamann
Dennis Jaamann

Reputation: 3565

There is a solution for your problem:

http://www.ericfeminella.com/blog/actionscript-3-apis/

Have a look at the CollectionIterator class.

Cheers

Upvotes: 1

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