Thanks for the reply, Dimitros. In this case setting the vertical
scroll won't work since the application doesn't know what position to
scroll to (the list could be hundreds of items long). I've found a
compromise since I last posted by using a second row selection as the
"hover" state, then deselecting it on mouse out. Now I just need to
change the background colors of the selected cells to "spoof" the hover
state of the grid via Sreenivas's ADGItemRendererEx
<http://flexpearls.blogspot.com/2008/02/row-background-color-in.html> .
Here is the code in case anyone else needs to replicate this
functionality;
private var highlighted:Object;
private var selected:Object;
private function nodeOverHandler(e:NodeEvent):void
{
highlighted = e.target.nodeSource;
var hIndex:uint;
if (selected && grid.selectedItems.length > 0)
{
grid.selectedItems = [selected, highlighted];
hIndex = grid.selectedItems.indexOf(highlighted);
}
else
{
grid.selectedItems = [highlighted];
hIndex = 0;
}
grid.scrollToIndex(grid.selectedIndices[hIndex]);
}
private function nodeOutHandler(e:NodeEvent):void
{
if (selected)
{
grid.selectedItems = [selected];
grid.scrollToIndex(grid.selectedIndices[0]);
}
else
{
grid.selectedItems = [null];
}
}
private function nodeClickHandler(e:NodeEvent):void
{
selected = e.target.nodeSource;
grid.selectedItems = [selected];
grid.expandItem(grid.selectedItems[0], true, true);
grid.scrollToIndex(grid.selectedIndices[0]);
}
--- In flexcoders@yahoogroups.com, "Dimitrios Gianninas"
<[EMAIL PROTECTED]> wrote:
>
> try changing the verticalScrollPosition property.
>
> adg.verticalScrollPosition = 5;
>
> Dimitrios Gianninas
> RIA Developer and Team Lead
> Optimal Payments Inc.
>
>
> ________________________________
>
> From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED]
On Behalf Of Parker Ault
> Sent: Tuesday, August 05, 2008 12:12 AM
> To: flexcoders@yahoogroups.com
> Subject: [flexcoders] scroll to non-visible item in hierarchical
AdvancedDataGrid
>
>
>
> Hey all,
>
> I need to programmatically scroll an AdvancedDataGrid component,
without changing the currently selected row, to an arbitrary item in a
HierarchicalData provider. I have another component that displays the
samedataset, and I want to synchronize the display states of
both,including select, mouseOver and mouseOut. The grid needs to scroll
as themouse is hovered over a new item in the other component. I've
posted an image here
<http://client.designcommission.com/temp/flex_component.jpg> to
illustrate.
>
> This seems like it should be a fairly straightforward feature to
implement, but I've already wasted at least 10 hours struggling with it.
The issue, of course, is that scrollToIndex won't work since the list
item is most likely non-visible and doesn't have an item renderer
associated with it to pull an index from.
>
> This is the event listener for the click event on the second graph,
which changes & scrolls to the new selection, and expands the newly
selected node. No problems there:
>
> private function nodeClickHandler(e:NodeEvent):void
> {
> grid.selectedItem = e.target.nodeSource;
> grid.expandItem(grid.selectedItem, true, true);
> grid.scrollToIndex(grid.selectedIndex);
> }
>
> I also tried holding the current selection in a temporary variable,
changing the selection, then switching back to the original selection.
Doesn't work. I tried doing the same but delaying the reset for a frame
to give the list a chance to update, but that caused all kinds of odd
behavior with the indices.
>
> var temp:Object = grid.selectedItem;
> grid.selectedItem = e.target.nodeSource;
> var itemIndex:uint = grid.selectedIndex;
> grid.invalidateList();
> grid.invalidateDisplayList();
> grid.selectedItem = temp;
> grid.scrollToIndex(itemIndex);
>
> The only other method I could think of was to use a frameloop and
iterate through the list until the item came into view and returned a
renderer, but it started returning renderers even when the item was off
screen, and attempting to scroll to the renderer's index did nothing.
I'm at a complete loss here! Can anyone point me in the right
direction!?
>
> Parker
>
>
>
>
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