DataGrid - distinct single event for data change

[vivoices]

I am looking for an event that a DataGrid dispatches ONCE when the data in its DataProvider changes.
I set up a test DataGrid that displays the row data of a "clicked item" directly from the ArrayCollection being assigned as the DataProvider.dg.addEventListener( ListEvent.ITEM_CLICK, itemClick );I spent hours looking for an event that is dispached once from either the DataGrid or the ArrayCollection to react to that change of data. NeitherdataToDisplay.addEventListener( FlexEvent.DATA_CHANGE, dataChange );nordg.addEventListener( FlexEvent.DATA_CHANGE, dataChange );are dispatching.
Events like "DataGridEvent.ITEM_EDIT_BEGIN", "DataGridEvent.ITEM_EDIT_BEGINNING" or "DataGridEvent.ITEM_EDIT_END" are unreliable with the default and my custom ItemRenderers.
Other events relate only to the display aspect of the DataGrid and not the underlying data.

Any ideas?

Thanks,
David

[JeTSpice]

perhaps removing the event listener after it is dispatched once?

[wvxvw]

Sorry, there was a discussion about it, but I couldn't find that thread... but there should be a way to:
- prevent ArrayCollection from autorefreshing.
- prevent it from dispatching a "change" even on every added / removed item (even when you are adding / removing multiple items at a time).
- finally make it dispatch a sort of "multiple change" event...

Well, honestly, I'd simply turn off autoupdates and update array collection manually (through the ArrayCollection#source) when I need...

[vivoices]

I think, I will write my own RowData dynamic class that dispatches all events I need (get and set functions) in an all-static GlobalEvents class.
The data for the DataGrid will be built likedataToDisplay = new ArrayCollection();
dataToDisplay.addItem( new RowData() ); . . . thus getting a (hopefully) rock-solid event behaviour dispached right at the datasource.

All the tests I was running today on the DataGrid events gave me the impression that the DataGrid is still a very messy object.

David

[vivoices]

The solution is simpler than I thought: ObjectProxy did the job.dataToDisplay = new ArrayCollection();
rowItem = new Object();

// populate rowItem with data

rowProxy = new ObjectProxy( rowItem, "row" + c )
rowProxy.addEventListener( PropertyChangeEvent.PROPERTY_CHANGE, dataChange );
dataToDisplay.addItem( rowProxy );
dataGrid.dataProvider = dataToDisplay;

private function dataChange( event:PropertyChangeEvent ):void
{
// data change handeling code
}now a reliable, single event is fired directly from the data source when a value changes. I did not try to wrap the whole ArrayCollection in a single ObjectProxy yet.