Comments on: Drag-and-Drop in Flex 4

By: lu

lu — Mon, 31 Oct 2011 13:40:03 +0000

I want to add a text in a List on position X, anybody know how to do it?

By: fox

fox — Thu, 22 Sep 2011 05:24:02 +0000

found in your follow up post, Drag-and-Drop Revisited, thank you very much!!!

By: fox

fox — Thu, 22 Sep 2011 05:14:20 +0000

How could we use this to sort or reorder a list? At the moment the dragged items ar always added as last item. How could we add a drag target indicator?

By: justin

justin — Mon, 08 Aug 2011 16:39:49 +0000

@Alek: you just need some way to track state, then a reset button could revert everything back to the saved state.

For a simple impl, I’d probably use a hash of arrays, like this:

_saved = { colA:[0,1,2], colB:[3] };

Then a reset button would just walk the hash and make each column match the saved state.

By: Alek

Alek — Mon, 08 Aug 2011 15:37:50 +0000

i am curious how you would go about using a reset button with this example

By: justin

justin — Thu, 09 Jun 2011 19:57:48 +0000

@Steve: You are off in custom world...but it is probably not too bad. In mouseDownHandler() on the object you are dragging you'll need to figure out the bounds of the object relative to the mouse. Then in your dragEnterHandler() on the target, don't call

acceptDragDrop(), instead you'll need to use a mouseMove() handler (probably on the stage) to accept only when the object completely inside your drop target container.

Good luck.



By: Steve
Steve — Thu, 09 Jun 2011 19:34:29 +0000
Any easy way to detect if the whole image is over the drop container instead of the mouse cursor?
For instance, if I click on the middle of the square, once my mouse cursor is over the target, Flex accepts it even though the entire image of the square isn’t over the target.



By: justin
justin — Mon, 18 Apr 2011 15:23:08 +0000
@vasu:  The short answer is you can use the events mouseDown, dragEnter, dragDrop to do whatever you want.

The long answer is it's not gonna be easy.  Depending on how tightly you want to control the UI, you might need to create a completely custom d&d impl.


By: vasu
vasu — Mon, 18 Apr 2011 06:04:44 +0000
is it possible to add easing effects?



By: Daniel McQuillen
Daniel McQuillen — Wed, 01 Dec 2010 23:57:30 +0000
I’m trying to use a Flex 4 list as a component to drag stuff from, but only for the visual effect (I have some code that handles the business logic of a drop). However, the list item dragged disappears after a drop, even though I’m not doing anything with it. Any insight into why this might happen?
Thanks for any thoughts, Justin. As always, thanks for the great posts.