[Flashcoders] using scrollRect and the width / height properties in AS3 F9 - weirdness

2008-04-01 Thread John Axel Eriksson 

Hi.


I'm building a simple scrollbar and a scrollcontent class. I'm using  
these in dialogs among other things.
These dialogs draw a frame around their content based on the contents  
width and height + a margin (to
describe it simply). I've not had any problems with this until I  
started using my scroll classes and, to be more

precise, using scrollRects.

What I've found out is that when a scrollRect is set on a  
DisplayObject, the width and height properties on that
DisplayObject do not reflect the scrollRects values until some time in  
the future (perhaps next frame) - I've tested
using a timer which traces out the width and height values at  
different times.


My problem is that this messes up the whole displayList hierarchy and  
the only way to get my dialogs to draw right
is to set some arbitrary timer to fire an event which updates the  
dialog and spefically the frame around the content at
some time in the future (50-100 ms seems to work, but perhaps a  
shorter period could work as well). This is completely

INSANE in my opinion and it doesn't even fix all problems for me.

Why do scrollRects work like that? I can't see ANY benefit to it, only  
trouble. Could anyone help out or explain why this

works the way it does?


Try it yourselves:


import flash.display.*;
import flash.geom.*;
import flash.events.TimerEvent;
import flash.utils.Timer;

var sp1:Sprite=new Sprite();
sp1.graphics.beginFill(0x99,1.0);
sp1.graphics.drawRect(0,0,100,100);

var sp2:Sprite=new Sprite();
sp2.scrollRect=new Rectangle(0,0,20,20);

sp2.addChild(sp1);
addChild(sp2);


function traceValues(te:TimerEvent=null){
trace('container width: '+sp2.width);
trace('child width: '+sp1.width);
}

traceValues();

var t:Timer=new Timer(100, 1);
t.addEventListener(TimerEvent.TIMER, traceValues);
t.start();

stop();
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Re: [Flashcoders] using scrollRect and the width / height properties in AS3 F9 - weirdness

2008-04-01 Thread Pedro Kostelec 
I don't get your problem. What is this code about? It has no scrollbar??!!
If you want to refresh the stage faster (using a timer) just add
t.updateAfterEvent();

On Tue, Apr 1, 2008 at 8:26 PM, John Axel Eriksson [EMAIL PROTECTED] wrote:

 Hi.


 I'm building a simple scrollbar and a scrollcontent class. I'm using
 these in dialogs among other things.
 These dialogs draw a frame around their content based on the contents
 width and height + a margin (to
 describe it simply). I've not had any problems with this until I
 started using my scroll classes and, to be more
 precise, using scrollRects.

 What I've found out is that when a scrollRect is set on a
 DisplayObject, the width and height properties on that
 DisplayObject do not reflect the scrollRects values until some time in
 the future (perhaps next frame) - I've tested
 using a timer which traces out the width and height values at
 different times.

 My problem is that this messes up the whole displayList hierarchy and
 the only way to get my dialogs to draw right
 is to set some arbitrary timer to fire an event which updates the
 dialog and spefically the frame around the content at
 some time in the future (50-100 ms seems to work, but perhaps a
 shorter period could work as well). This is completely
 INSANE in my opinion and it doesn't even fix all problems for me.

 Why do scrollRects work like that? I can't see ANY benefit to it, only
 trouble. Could anyone help out or explain why this
 works the way it does?


 Try it yourselves:


 import flash.display.*;
 import flash.geom.*;
 import flash.events.TimerEvent;
 import flash.utils.Timer;

 var sp1:Sprite=new Sprite();
 sp1.graphics.beginFill(0x99,1.0);
 sp1.graphics.drawRect(0,0,100,100);

 var sp2:Sprite=new Sprite();
 sp2.scrollRect=new Rectangle(0,0,20,20);

 sp2.addChild(sp1);
 addChild(sp2);


 function traceValues(te:TimerEvent=null){
trace('container width: '+sp2.width);
trace('child width: '+sp1.width);
 }

 traceValues();

 var t:Timer=new Timer(100, 1);
 t.addEventListener(TimerEvent.TIMER, traceValues);
 t.start();

 stop();
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-- 
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Re: [Flashcoders] using scrollRect and the width / height properties in AS3 F9 - weirdness

2008-04-01 Thread John Eriksson 
This code is about the width and height properties not getting changed until
some time in the future (perhaps one frame ahead or a few ms ahead) when
setting a scrollRect. This causes all kinds of problems. The code was very
very simple, just to show that the values are not immediately changed when
setting a scrollRect... I would like to know why that is and what possible
benefits there could be?

The code only shows that setting a scrollRect does NOT immediately change a
DisplayObject's width and height props.

/John

2008/4/1, Pedro Kostelec [EMAIL PROTECTED]:

 I don't get your problem. What is this code about? It has no scrollbar??!!
 If you want to refresh the stage faster (using a timer) just add
 t.updateAfterEvent();


 On Tue, Apr 1, 2008 at 8:26 PM, John Axel Eriksson [EMAIL PROTECTED] wrote:

  Hi.
 
 
  I'm building a simple scrollbar and a scrollcontent class. I'm using
  these in dialogs among other things.
  These dialogs draw a frame around their content based on the contents
  width and height + a margin (to
  describe it simply). I've not had any problems with this until I
  started using my scroll classes and, to be more
  precise, using scrollRects.
 
  What I've found out is that when a scrollRect is set on a
  DisplayObject, the width and height properties on that
  DisplayObject do not reflect the scrollRects values until some time in
  the future (perhaps next frame) - I've tested
  using a timer which traces out the width and height values at
  different times.
 
  My problem is that this messes up the whole displayList hierarchy and
  the only way to get my dialogs to draw right
  is to set some arbitrary timer to fire an event which updates the
  dialog and spefically the frame around the content at
  some time in the future (50-100 ms seems to work, but perhaps a
  shorter period could work as well). This is completely
  INSANE in my opinion and it doesn't even fix all problems for me.
 
  Why do scrollRects work like that? I can't see ANY benefit to it, only
  trouble. Could anyone help out or explain why this
  works the way it does?
 
 
  Try it yourselves:
 
 
  import flash.display.*;
  import flash.geom.*;
  import flash.events.TimerEvent;
  import flash.utils.Timer;
 
  var sp1:Sprite=new Sprite();
  sp1.graphics.beginFill(0x99,1.0);
  sp1.graphics.drawRect(0,0,100,100);
 
  var sp2:Sprite=new Sprite();
  sp2.scrollRect=new Rectangle(0,0,20,20);
 
  sp2.addChild(sp1);
  addChild(sp2);
 
 
  function traceValues(te:TimerEvent=null){
 trace('container width: '+sp2.width);
 trace('child width: '+sp1.width);
  }
 
  traceValues();
 
  var t:Timer=new Timer(100, 1);
  t.addEventListener(TimerEvent.TIMER, traceValues);
  t.start();
 
  stop();

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 --
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