On Fri, May 22, 2009 at 5:47 AM, lampei <lam...@gmail.com> wrote:
> Until recently, I did not know that you could reset the combobox back to the
> "prompt" value by ctrl-clicking the value in the combobox dropdown. However,
> as most people don't know that this is a possiblity with the combobox, I'm
> trying to mimic this functionality by setting the selectedIndex to -1 if a
> person clicks (without the ctrl key) the same value that is already selected.
>
> I have yet to find the "selectedIndexChanged" property change to anything
> other than false when the "change" event fires, so I'm unable to use that
> (same for selectedItemChanged). I tried setting the item under the mouse
> when "itemRollOver" fires to a property, then set it to null when
> "itemRollOut" fires. Then when the person clicks, I said if the selectedItem
> == the value underneath the mouse during itemRollOver, set the selectedIndex
> = -1, however, the itemRollOut seems to fire before the click event is fired.
> I've also yet to find where the code is for the ctrl-left click, or what
> causes that event to fire.
>
The code is in ListBase.as: the selectItem function (called from
mouseDownHandler).
// allow unselecting via ctrl-click
if (ctrlKey && selectedData[uid])
{
selectionChange = true;
clearSelected(transition);
}
Here's the solution.
1. Make a custom class, MyList.
public class MyList extends List
{
override protected function selectItem(item:IListItemRenderer,
shiftKey:Boolean, ctrlKey:Boolean,
transition:Boolean = true):Boolean
{
var index:int = itemRendererToIndex(item);
if (index == selectedIndex)
ctrlKey = true;
return super.selectItem(item, shiftKey, ctrlKey, transition);
}
}
2. Use this class as the dropdown in the ComboBox.
<mx:ComboBox id="cb" prompt="-- select --" dataProvider="{['1', '2', '3']}"
dropdownFactory="{new ClassFactory(MyList)}" />
Tada!
Manish
--
www.manishjethani.com
