Flex Examples
The following example shows how you can align tabs within a Flex TabBar control by setting the horizontalAlign style.
Full code after the jump.
<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/03/19/horizontally-aligning-tabs-within-a-tabbar-control-in-flex/ -->
<mx:Application name="TabBar_horizontalAlign_test"
xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="middle"
backgroundColor="white">
<mx:Array id="arr">
<mx:Object label="Button" />
<mx:Object label="ButtonBar" />
<mx:Object label="ColorPicker" />
<mx:Object label="ComboBox" />
</mx:Array>
<mx:ApplicationControlBar dock="true">
<mx:Form styleName="plain">
<mx:FormItem label="horizontalAlign:">
<mx:ComboBox id="comboBox">
<mx:dataProvider>
<mx:Array>
<mx:Object label="left" />
<mx:Object label="center" />
<mx:Object label="right" />
</mx:Array>
</mx:dataProvider>
</mx:ComboBox>
</mx:FormItem>
</mx:Form>
</mx:ApplicationControlBar>
<mx:Box backgroundColor="haloSilver">
<mx:TabBar id="tabBar"
dataProvider="{arr}"
width="600"
tabWidth="100"
tabHeight="40"
horizontalAlign="{comboBox.selectedItem.label}"
direction="horizontal" />
</mx:Box>
</mx:Application>
View source is enabled in the following example.
You can also set the horizontalAlign style in an external .CSS file or <mx:Style /> block, as seen in the following example:
<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/03/19/horizontally-aligning-tabs-within-a-tabbar-control-in-flex/ -->
<mx:Application name="TabBar_horizontalAlign_test"
xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="middle"
backgroundColor="white">
<mx:Style>
TabBar {
horizontalAlign: center;
tabWidth: 100;
tabHeight: 40;
}
</mx:Style>
<mx:Array id="arr">
<mx:Object label="Button" />
<mx:Object label="ButtonBar" />
<mx:Object label="ColorPicker" />
<mx:Object label="ComboBox" />
</mx:Array>
<mx:Box backgroundColor="haloSilver">
<mx:TabBar id="tabBar"
dataProvider="{arr}"
width="600"
direction="horizontal" />
</mx:Box>
</mx:Application>
Or, you can set the horizontalAlign style using ActionScript, as seen in the following example:
<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/03/19/horizontally-aligning-tabs-within-a-tabbar-control-in-flex/ -->
<mx:Application name="TabBar_horizontalAlign_test"
xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="middle"
backgroundColor="white">
<mx:Script>
<![CDATA[
import mx.events.ListEvent;
private function comboBox_change(evt:ListEvent):void {
tabBar.setStyle("horizontalAlign", comboBox.selectedItem.label);
}
]]>
</mx:Script>
<mx:Array id="arr">
<mx:Object label="Button" />
<mx:Object label="ButtonBar" />
<mx:Object label="ColorPicker" />
<mx:Object label="ComboBox" />
</mx:Array>
<mx:ApplicationControlBar dock="true">
<mx:Form styleName="plain">
<mx:FormItem label="horizontalAlign:">
<mx:ComboBox id="comboBox"
change="comboBox_change(event);">
<mx:dataProvider>
<mx:Array>
<mx:Object label="left" />
<mx:Object label="center" />
<mx:Object label="right" />
</mx:Array>
</mx:dataProvider>
</mx:ComboBox>
</mx:FormItem>
</mx:Form>
</mx:ApplicationControlBar>
<mx:Box backgroundColor="haloSilver">
<mx:TabBar id="tabBar"
dataProvider="{arr}"
width="600"
tabWidth="100"
tabHeight="40"
direction="horizontal" />
</mx:Box>
</mx:Application>
Due to popular demand, here is the “same” example in a more ActionScript friendly format:
<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/03/19/horizontally-aligning-tabs-within-a-tabbar-control-in-flex/ -->
<mx:Application name="TabBar_horizontalAlign_test"
xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="middle"
backgroundColor="white"
initialize="init();">
<mx:Script>
<![CDATA[
import mx.containers.BoxDirection;
import mx.containers.Box;
import mx.containers.ApplicationControlBar;
import mx.containers.Form;
import mx.containers.FormItem;
import mx.controls.TabBar;
import mx.controls.ComboBox;
import mx.events.ListEvent;
private var arr:Array;
private var comboBox:ComboBox;
private var tabBar:TabBar;
private function init():void {
arr = [];
arr.push({label:"Button"});
arr.push({label:"ButtonBar"});
arr.push({label:"ColorPicker"});
arr.push({label:"ComboBox"});
var dp:Array = [];
dp.push({label:"left"});
dp.push({label:"center"});
dp.push({label:"right"});
comboBox = new ComboBox();
comboBox.dataProvider = dp;
comboBox.addEventListener(ListEvent.CHANGE,
comboBox_change);
var formItem:FormItem = new FormItem();
formItem.label = "horizontalAlign:";
formItem.addChild(comboBox);
var form:Form = new Form();
form.styleName = "plain";
form.addChild(formItem);
var appControlBar:ApplicationControlBar;
appControlBar = new ApplicationControlBar();
appControlBar.dock = true;
appControlBar.addChild(form);
addChildAt(appControlBar, 0)
tabBar = new TabBar();
tabBar.dataProvider = arr;
tabBar.width = 600;
tabBar.setStyle("tabWidth", 100);
tabBar.setStyle("tabHeight", 40);
tabBar.direction = BoxDirection.HORIZONTAL;
var box:Box = new Box();
box.setStyle("backgroundColor", "haloSilver");
box.addChild(tabBar);
addChild(box);
}
private function comboBox_change(evt:ListEvent):void {
tabBar.setStyle("horizontalAlign",
comboBox.selectedItem.label);
}
]]>
</mx:Script>
</mx:Application>
Peter deHaan
Peter deHaan currently works for Adobe on the Flex SDK QA team. While not working on Flex, Flash, and ColdFusion applications, Peter enjoys making up bios and writing in 3rd person. Peter's rarely updated blog can be found at blogs.adobe.com/pdehaan/, actionscriptexamples.com, airexamples.com, and coldfusionexamples.com.
Share
