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>
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