Helps the checkbox column layout

Here's what I need to accomplish:
I need to display a long list(50-200) of boxes w / labels in the form of multiple columns.  They should be sorted alphabetically down and across all columns. If scrolling is required, then it should only scroll vertically.  Something like the image below.

What I tried was to use a TileList component with an itemRenderer checkbox.  It works very well for 1 column and scrolls vertically very well.  It works very well for 3 columns, but when it scrolls it scrolls horizontally and I need to scroll vertically.  I have attached my code.
I noticed one thing is when you define '= vertical direction' for a component TileList list sorted vertically but horizontally scrolls.  If we leave it as default (= horizontal direction), then sort horizontally, it scrolls vertically.  I need to sort vertically and scroll vertically.  I tried to set the VerticallyScollPolicy and HorizontalScrollPolicy but just cut the data instead of changing the direction of travel.
I guess my second question is that if this feature is impossible with a TileList component, then which component would be a better option.
Thanks in advance for taking the time to answer my questions.


checkboxlist.jpg



<? XML version = "1.0" encoding = "utf-8"? >
" < = xmlns:mx mx:Application ' http://www.Adobe.com/2006/MXML "
xmlns:CSC = "" com.facl.uaf.Common.Shared.widget. * ""
Layout = "vertical".
verticalAlign = "top".
horizontalAlign = "center".
backgroundGradientColors = "[0x000000, 0 x 323232]."
paddingTop = "20".
paddingBottom = "20" >

< mx:ArrayCollection id = 'collection' >
< mx:Object label = "Alameda" / >
< mx:Object label = "Alpine" / >
< mx:Object label = "Amador" / >
< mx:Object label = "Butte" / >
< mx:Object label = "Calaveras" / >
< mx:Object label = "Del Norte" / >
< mx:Object label = "El Dorado" / >
< mx:Object label = "Fresno" / >
< mx:Object label = "Kern" / >
< mx:Object label = 'Los Angeles' / >
< mx:Object label = "Orange" / >
< mx:Object label = "Place" / >
< mx:Object label = "Plumas" / >
< mx:Object label = "Riverside" / >
< mx:Object label = "Sacramento" / >

< mx:Object label = "San Diego" / >
< mx:Object label = "San Francisco" / >
< mx:Object label = "Santa Barbara" / >
< mx:Object label = "Santa Clara" / >
< mx:Object label = "Santa Cruz" / >
< / mx:ArrayCollection >

" < = xmlns:mx mx:TileList ' http://www.Adobe.com/2006/MXML "
Color = "#323232".
textAlign = "left".
paddingLeft = "20".
itemRenderer = "mx.controls.CheckBox"
verticalScrollPolicy = "auto".
themeColor = "#FFFFFF."

dataProvider = "{collection}."
columnCount = '3 '.
width = "500".
Height = "100".
direction = "vertical" >
< / mx:TileList >

< / mx:Application >

A list like the TileList class made a number of important things.  It creates enough converters to fill the visible part, so you don't end up allocate tons of memory for thousands of pieces of data, and there a selection model where you can select one or more items of data, and he draws a reversal and selection of background color on the entire rendering engine.

What should you?  If this is not the case, a VBox with 3 HBoxes with 1/3 of the checkboxes in each HBox is all you need.  You can use a Repeater to generate checkboxes or just add it in a loop.

Alex Harui

Flex SDK Developer

Adobe Systems Inc..

Blog: http://blogs.adobe.com/aharui

Tags: Flex

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