The doc says don't call destroyToolTIp on the current tooltip. I'd search around to see if anyone else has a way of causing a tooltip to go away, but I'd probably do it by faking a mouse event instead of calling an mx_internal method.
From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of rviswanathan Sent: Sunday, November 30, 2008 11:52 AM To: [email protected] Subject: [flexcoders] NPE on ToolTipManagerImpl/reset() 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 -- View this message in context: http://www.nabble.com/NPE-on-ToolTipManagerImpl-reset%28%29-tp20761439p20761439.html Sent from the FlexCoders mailing list archive at Nabble.com.
