Effect of movement not executed on the transition from State

I have the following problem using view States, of transitions and the effect of movement

I have a component panel and States state1 and state2.

Panel is included in state1 but not in state2.

When view state is changed from state1 to state2 I want to animate the front panel is removed.

However, if I put a motion effect in my state of transition that it never runs because the Panel is removed before the effect plays.

The only solution I found was to add a fade transition effect. This prevents the Panel to detach and the effect of movement is plays correctly.

What continues? Is there a documentation explaining this? This could be a bug?

Here is a sample application to demonstrate the problem. Panel1 has the problem and workaround Panel2.

<? XML version = "1.0" encoding = "utf-8"? >

" < = xmlns:fx s:Application ' http://ns.Adobe.com/MXML/2009 "xmlns:s ="library://ns.adobe.com/flex/spark" "

xmlns:MX = "library://ns.adobe.com/flex/halo" >

< s: states >

< name s: State = "state1" / >

< name s: State = 'state2' / >

< / s: states >

< s:Group >

< s:Panel id = "panel1" y = "0" y.state2 = "100" title = "Group 1" includeIn = "state1" / > "

< s:Panel id = "panel2" x = "150" y = "0" y.state2 = "100" title = "Group 2" includeIn = "state1" / > "

< s:Button left = "300" label = "toggleState" click = "currentState = currentState == 'state1'? 'state2':"state1"" / > "

< / s:Group >

< s:transitions >

< s:Transition fromState = toState 'state1' = 'state2' >

< s:Parallel >

<!-strange! 1 Panel is removed before the effect of movement time->

< s:Move target = yTo "{panel1}" = "100" / >

<!-the workarount. With a mannequin fade effect panel2 stays visible and move effect is executed->

< s:Move target = yTo "{panel2}" = "100" / >

< s: bland target = alphaTo "{panel2}" = "1" / >

< / s:Parallel >

< / s:Transition >

< / s:transitions >

< / s:Application >

What is happening here is the Panel is removed from the DisplayList at the beginning of the transition before the passage has a chance to occur.  This happens by default unless someone tells the transition to remove the item at another time.

There is a special logic built into bland who knows when an element is removed from the DisplayList so that he knows to say the transition to weaken the element before removing it.  This is why the workaround you mentioned works for your case.

You will notice that if you use:


The target fades out as long as his movement before retiring from the DisplayList.

Normally, in this situation the transition must know when to remove the item from the DisplayList and you can tell him that using the RemoveAction tag, for example:

http://ns.Adobe.com/MXML/2009"xmlns:s ="library://ns.adobe.com/flex/spark">
   
       
       
   

   
   


       
   
   
   
   
   
       
           
               
               
           

       

   

Note that in this transition, I use a sequence and put the RemoveAction after the move, so the transition knows to move the item before removing it.

By the way, thanks for the great code example!  When posting code on here is compile concise, complete, and I can quickly copy and paste into Flash Builder, I'm much more likely to focus on the issue.

Tags: Flex

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