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Need Help with Nested View stacks in Flex3

Posted on 2010-09-15
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Last Modified: 2012-05-10
I am in the process of learning Flex and experimenting various controls and layout properties.
In my application i have viewstack1 which is controlled by a buton bar which is working fine, then inside viewstack1 and in one of the stacks i have a another view stack (viewstack_2) which i am trying to control by the accordion.

View stack 2 does work in view stack 1, but if take out viewstack 2 from viewstack 1 then view stack 2 works.

Is this not possible in Flex or i am doing something wrong?

Thanks
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Question by:X-quisite
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Expert Comment

by:ChristoferDutz
ID: 33682832
Is the Accordeon on the same view-stack page of viewstack1?

Even if you have created the viewstack2 inside the viewstack1, flex doesn't automatically create it right away. Usually as soon as you switch to the tab containing viewstack2 this will be created. I assume that the Accordeon is outside the viewstack1. Then it will try to bind to an object that doesn't exist. When changing to the layer containing viewstack2 the two components are not completely linked together.

If you paste your code here, I'll try to fix it for you and explain why it didn't work (This way you'll have it working and know why it didn't work)
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Author Comment

by:X-quisite
ID: 33683280
on test 2, there is another viewstack which i am trying to control
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
	<mx:Script>
            <![CDATA[
                  import mx.binding.utils.BindingUtils;
                  
            
                  private function init():void
                  {
                        BindingUtils.bindSetter(setVS, accordion, "selectedIndex");      
                  }
                  
                  private function setVS(selectedIndex:Number):void
                  {
                        viewstack2.selectedIndex = selectedIndex;
                  }
            ]]>
      </mx:Script>

	
	<mx:ApplicationControlBar x="27" y="10" width="624">
		<mx:ButtonBar dataProvider="viewstack1">
		</mx:ButtonBar>
	</mx:ApplicationControlBar>
	<mx:ViewStack x="27" y="62" id="viewstack1" width="624" height="264">
		<mx:Panel label="test1" width="100%" height="100%">
			<mx:Label text="its view 1"/>
		</mx:Panel>
		<mx:Panel label="test2" width="100%" height="100%">
			<mx:VDividedBox width="100%" height="100%">
				<mx:HDividedBox width="100%" height="100%">
					<mx:Accordion id="accordion" width="200" height="200">
						<mx:Canvas label="Accordion Pane 1" width="100%" height="100%">
						</mx:Canvas>
						<mx:Canvas label="second" width="100%" height="100%">
						</mx:Canvas>
					</mx:Accordion>
					<mx:ViewStack id="viewstack2" width="200" height="200">
						<mx:Canvas label="View 1" width="100%" height="100%">
							<mx:Label x="64" y="135" text="accordion 1"/>
						</mx:Canvas>
						<mx:Panel label="second view" width="100%" height="100%">
						</mx:Panel>
					</mx:ViewStack>
				</mx:HDividedBox>
			</mx:VDividedBox>
		</mx:Panel>
	</mx:ViewStack>
	
</mx:Application>

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Accepted Solution

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ChristoferDutz earned 500 total points
ID: 33683543
Ok ... now I can see the problem. Even if the structure is different, the problem is the same. The callback "init" is called before the viewstack-page with the accoridon is created. So the accordion variable is null at the time the init method is executed resulting in nothing beeing bound at all.

The following code works, but it does not make use of the Bindingutils ... I'll build a version using that approach and post it in a few minutes.
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
	<mx:ApplicationControlBar x="27" y="10" width="624">
		<mx:ButtonBar dataProvider="viewstack1">
		</mx:ButtonBar>
	</mx:ApplicationControlBar>
	<mx:ViewStack x="27" y="62" id="viewstack1" width="624" height="264">
		<mx:Panel label="test1" width="100%" height="100%">
			<mx:Label text="its view 1"/>
		</mx:Panel>
		<mx:Panel label="test2" width="100%" height="100%">
			<mx:VDividedBox width="100%" height="100%">
				<mx:HDividedBox width="100%" height="100%">
					<mx:Accordion id="accordion" width="200" height="200">
						<mx:Canvas label="Accordion Pane 1" width="100%" height="100%">
						</mx:Canvas>
						<mx:Canvas label="second" width="100%" height="100%">
						</mx:Canvas>
					</mx:Accordion>
					<mx:ViewStack id="viewstack2" selectedIndex="{accordion.selectedIndex}" width="200" height="200">
						<mx:Canvas label="View 1" width="100%" height="100%">
							<mx:Label x="64" y="135" text="accordion 1"/>
						</mx:Canvas>
						<mx:Panel label="second view" width="100%" height="100%">
						</mx:Panel>
					</mx:ViewStack>
				</mx:HDividedBox>
			</mx:VDividedBox>
		</mx:Panel>
	</mx:ViewStack>
	
</mx:Application>

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Expert Comment

by:ChristoferDutz
ID: 33683591
Ok ... it worked a lot faster than I anticipated :-)

While doing it I could notice that your init method was propably never called. In my example I added the init method as listener for the creationComplete event of the second viewstack page of viewstack1. This event is fired as soon as the element is finished initializing and therefore the bindingutils can do the binding magic.

Hope this makes things a little clearer for you :-)
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
	<mx:Script>
		<![CDATA[
			import mx.binding.utils.BindingUtils;
			
			private function init():void
			{
				BindingUtils.bindSetter(setVS, accordion, "selectedIndex");      
			}
			
			private function setVS(selectedIndex:Number):void
			{
				viewstack2.selectedIndex = selectedIndex;
			}
		]]>
	</mx:Script>
	
	<mx:ApplicationControlBar x="27" y="10" width="624">
		<mx:ButtonBar dataProvider="viewstack1">
		</mx:ButtonBar>
	</mx:ApplicationControlBar>
	<mx:ViewStack x="27" y="62" id="viewstack1" width="624" height="264">
		<mx:Panel label="test1" width="100%" height="100%">
			<mx:Label text="its view 1"/>
		</mx:Panel>
		<mx:Panel label="test2" width="100%" height="100%">
			<mx:VDividedBox width="100%" height="100%">
				<mx:HDividedBox width="100%" height="100%" creationComplete="init()">
					<mx:Accordion id="accordion" width="200" height="200">
						<mx:Canvas label="Accordion Pane 1" width="100%" height="100%">
						</mx:Canvas>
						<mx:Canvas label="second" width="100%" height="100%">
						</mx:Canvas>
					</mx:Accordion>
					<mx:ViewStack id="viewstack2" width="200" height="200">
						<mx:Canvas label="View 1" width="100%" height="100%">
							<mx:Label x="64" y="135" text="accordion 1"/>
						</mx:Canvas>
						<mx:Panel label="second view" width="100%" height="100%">
						</mx:Panel>
					</mx:ViewStack>
				</mx:HDividedBox>
			</mx:VDividedBox>
		</mx:Panel>
	</mx:ViewStack>
	
</mx:Application>

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Author Closing Comment

by:X-quisite
ID: 33685050
Just the right solution
Thank you.
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