Solved

How to get actionscript generated component to update its properties

Posted on 2008-06-10
6
555 Views
Last Modified: 2008-06-13
Oh man I am obviously missing something here but not sure what it is.  How can I get the HBox to update its width after an addChild().  I am tracing our the width before and after the addChild but it doesnt change.
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
	 layout="absolute"
	 creationComplete="init();">
	<mx:Script>
		<![CDATA[
			import mx.controls.Label;
			import mx.containers.HBox;
			
			private function init():void {
				var row:HBox = new HBox();
				var txt:Label = new Label();
				txt.text = "just some text";
				
				trace(row.width.toString());
				row.addChild(txt);
				trace(row.width.toString());
			}	
		]]>
	</mx:Script>
</mx:Application>

Open in new window

0
Comment
Question by:joebox
  • 3
  • 2
6 Comments
 
LVL 3

Expert Comment

by:taus01
ID: 21749527
Try calling the one or both of following Methods before you add the child:

/* Marks a component so that its updateDisplayList() method gets called during a later screen update */
row.invalidateDisplayList();
 
/* Marks a component so that its measure() method gets called during a later screen update. */
row.invalidateSize();

Open in new window

0
 

Author Comment

by:joebox
ID: 21749747
thanks for the tip but it didn't bring any luck.  Both traces are still coming up as 0.  Here is the updated code that i ran.
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
	 layout="absolute"
	 creationComplete="init();">
	<mx:Script>
		<![CDATA[
			import mx.controls.Label;
			import mx.containers.HBox;
			
			private function init():void {
				var row:HBox = new HBox();
				this.addChild(row);
				var txt:Label = new Label();
				txt.text = "just some text";
				
				trace(row.width.toString());
				row.invalidateDisplayList();
				row.invalidateSize();
				row.addChild(txt);
				trace(row.width.toString());
			}	
		]]>
	</mx:Script>
</mx:Application>

Open in new window

0
 
LVL 19

Accepted Solution

by:
Gary Benade earned 500 total points
ID: 21757188

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
	 layout="absolute" creationComplete="init()">
	<mx:Script>
		<![CDATA[
			import mx.controls.Label;
			import mx.containers.HBox;
			
			private function init():void 
			{
				var row:HBox = new HBox();
				this.addChild(row);
				var txt:Label = new Label();
				txt.text = "just some text";
				row.addChild( txt);
				trace(txt.measuredWidth);
				trace(row.measuredWidth);
				row.validateNow();
				trace(txt.measuredWidth);
				trace(row.measuredWidth);
			}	
		]]>
	</mx:Script>
</mx:Application>

Open in new window

0
VMware Disaster Recovery and Data Protection

In this expert guide, you’ll learn about the components of a Modern Data Center. You will use cases for the value-added capabilities of Veeam®, including combining backup and replication for VMware disaster recovery and using replication for data center migration.

 

Author Comment

by:joebox
ID: 21777086
Sorry took so long to get back to you.  You rock for helping out.   Your solution does work I just wanted to ask you one more thing about it.  Is there any way to get the length of the string before you add it to the container.

var txt:Label = new Label();
txt.text = "just some text";
txt.validateNow():
trace(txt.measuredWidth);

this doesnt work.
.  
0
 
LVL 19

Expert Comment

by:Gary Benade
ID: 21778203
Check out
http://livedocs.adobe.com/labs/air/1/aslr/flash/text/TextLineMetrics.html
http://blog.greensock.com/textmetrics/

From my experience these classes don't bother measuring themselves until they are added to the display list.
0
 

Author Comment

by:joebox
ID: 21778298
hey I thank you very very much for all your help.
0

Featured Post

Problems using Powershell and Active Directory?

Managing Active Directory does not always have to be complicated.  If you are spending more time trying instead of doing, then it's time to look at something else. For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

First things first - Preparation We need all the part for this install and it's much nicer to have them all on hand when you need them so here's what's required. Download Eclipse 3.5 32 bit (I like the Classic flavour) from here. (http://www.e…
February 24, 2017 — On February 23, Travis Ormandy, a vulnerability researcher at Google, reported on Twitter (https://twitter.com/taviso/status/834900838837411840) that massive stores of data have been leaked by CloudFlare, a company that provide…
This video shows how to use Hyena, from SystemTools Software, to bulk import 100 user accounts from an external text file. View in 1080p for best video quality.

821 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question