Archive for May, 2008

May
7
Changing Flex3 ScrollBar maxScrollPosition at runtime


Posted: 7th May 2008
Posted in Uncategorized
Comments: 1 Comment »

A quick tip if you have a dynamic scroll bar and want to bind it’s maxScrollPosition to a value at runtime unfortunately you can’t use the MXML binding, i.e. maxScrollPosition={value}.

Alternatively you need to set the value programatically in an event handler, AND importantly call updateDisplayList() on the scrollbar. i.e.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical">
	<mx:Script>
		<![CDATA[
			private function handleSlideChange():void {
				scroll.maxScrollPosition = slider.value;
				scroll.invalidateDisplayList();
			}
		]]>
	</mx:Script>
	<mx:HSlider minimum="1" maximum="10" value="1" tickInterval="1"
		liveDragging="true" id="slider" width="50%"
		change="handleSlideChange()" snapInterval="1"/>
 
	<mx:HScrollBar scrollPosition="0" width="50%" id="scroll" pageSize="1"/>
</mx:Application>




Permalink | dzone | 1 Comment »