well if it is synchronous then this will help squat unless a separate thread gets spawned, since the drawing cycle and the render cycle are split in the vm. so, if it does not lock up the vm (which basically renders you powerless) then it ain't synchronous.
On Thu, Nov 19, 2009 at 2:57 AM, ag_rcuren <[email protected]>wrote: > > > Here is some code that will show a very simply way using a timer to show > some UI before you start your sync stuff. NOTE using a timer is bad because > you can not guarantee how much time it will take for your UI to display. The > best thing to do would be create some sort of popup that fires an event when > it is fully visible. Listen for that even and once that happens then you > start your synchronous process because at that time you will be sure your UI > is ready. > > <?xml version="1.0" encoding="utf-8"?> > <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; > layout="absolute"> > <mx:Script> > <![CDATA[ > import mx.managers.CursorManager; > import mx.events.FlexEvent; > import mx.controls.Alert; > > private function bigNastySynchronousThing():void > { > trace("running"); > var i:int = 0; > for (i; i < 20000000; i++) > { > //trace really slows things down > var x:Number = Math.sqrt(500) / Math.sqrt(20); > } > trace("done"); > } > > private function noGood(event:MouseEvent):void > { > mx.controls.Alert.show("You wont see this untill we are done because the ui > cant update"); > bigNastySynchronousThing(); > } > > private function kindGood(event:MouseEvent):void > { > Alert.show("This will take some time, hold on"); > CursorManager.setBusyCursor(); > var t:Timer = new Timer(1000, 1); > t.addEventListener(TimerEvent.TIMER_COMPLETE, tc); > t.start(); > } > > private function tc(event:TimerEvent):void > { > trace(event.target); > EventDispatcher(event.target).removeEventListener(event.type, > arguments.callee); > this.callLater(bigNastySynchronousThing); > CursorManager.removeBusyCursor(); > > } > ]]> > </mx:Script> > <mx:Button label="no good" click="noGood(event);"/> > <mx:Button label="kinda good" click="kindGood(event);" x="81"/> > </mx:Application> > > > --- In [email protected] <flexcoders%40yahoogroups.com>, Richard > Rodseth <rrods...@...> wrote: > > > > What's a good way to display progress or a busy cursor for a potentially > > long-running, but synchronous operation (in my case generating a PDF > using > > AlivePDF) ? > > > > As noted here, CursorManager.setBusyCursor doesn't display the cursor > until > > there is no code running, and PopupManager seems to act similarly. > > > > Defer initiation of the operation using a timer? > > > > > -- j:pn \\no comment
