Hi All
I am facing an NPE with tooltips, the problem is outlined below.
Set up: (I use Flex 2.0)
I have a UI where I have a datagrid that gets populated by data coming from
a remote server call. My module contains a timer that sends out a refresh
request (server call) to paint the datagrid with the latest data. This timer
fires every 20 seconds. Also, when I point to a datagrid cell, I see the
tooltip that shows the content of this cell.
This is what I have done to disable and enable tooltips during the server
call.
a) Prior to makign the server call, I destroy the current tooltip using
ToolTipManager.destroyToolTip(). I also set the
ToolTipManager.currentToolTip to null. I also make ToolTipManager.enabled as
false.
b) On getting a response from the server, I set ToolTipManager.enabled as
true.
Now, here's the problem.
I keep my mouse on a cell and a tooltip is displayed. At some time T, the 20
second timer fires that makes a server call. At this very same moment, I
move my mouse out of the cell, so the tooltip's mouseouthandler gets called.
I get an exception in ToolTipManagerImpl/reset() method. From the trace, it
shows an NPE. This happens only when I move the mouse out of a tooltip and a
refresh call to the server goes.
The lines around getSystemManager(previousTarget) is where I think I hit an
exception, probably because the system manager for the previousTarget is
null and the next line throws an NPE, although I am not a 100% sure.
>From ToolTipManagerImpl.reset() method
private function reset():void
{
....
....
if (currentToolTip)
{
....
....
// Remove it.
var sm:ISystemManager = getSystemManager(previousTarget);
sm.toolTipChildren.removeChild(DisplayObject(currentToolTip));
currentToolTip = null;
....
....
}
}
Any pointers to overcome this would really help.
Thanks
Ram
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