Flex Examples

The following example shows how you can set the tab width on a Flex TabBar control by setting the aptly named tabWidth style.

Full code after the jump.

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/10/04/setting-the-tab-width-on-a-tabbar-control-in-flex/ -->
<mx:Application name="TabBar_tabWidth_test"
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Array id="arr">
        <mx:Object label="Red" />
        <mx:Object label="Orange" />
        <mx:Object label="Yellow" />
        <mx:Object label="Green" />
        <mx:Object label="Blue" />
    </mx:Array>

    <mx:ApplicationControlBar dock="true">
        <mx:Form styleName="plain">
            <mx:FormItem label="tabWidth:">
                <mx:HSlider id="slider"
                        minimum="40"
                        maximum="120"
                        value="100"
                        snapInterval="1"
                        tickInterval="10"
                        liveDragging="true" />
            </mx:FormItem>
        </mx:Form>
    </mx:ApplicationControlBar>

    <mx:TabBar id="tabBar"
            dataProvider="{arr}"
            tabWidth="{slider.value}" />

</mx:Application>

View source is enabled in the following example.

You can also set the tabWidth style in an external .CSS file or <mx:Style /> block, as seen in the following example:

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/10/04/setting-the-tab-width-on-a-tabbar-control-in-flex/ -->
<mx:Application name="TabBar_tabWidth_test"
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Style>
        TabBar {
            tabWidth: 120;
        }
    </mx:Style>

    <mx:Array id="arr">
        <mx:Object label="Red" />
        <mx:Object label="Orange" />
        <mx:Object label="Yellow" />
        <mx:Object label="Green" />
        <mx:Object label="Blue" />
    </mx:Array>

    <mx:TabBar id="tabBar"
            dataProvider="{arr}" />

</mx:Application>

Or, you can set the tabWidth style using ActionScript, as seen in the following example:

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/10/04/setting-the-tab-width-on-a-tabbar-control-in-flex/ -->
<mx:Application name="TabBar_tabWidth_test"
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Script>
        <![CDATA[
            import mx.events.SliderEvent;

            private function slider_change(evt:SliderEvent):void {
                tabBar.setStyle("tabWidth", evt.value);
            }
        ]]>
    </mx:Script>

    <mx:Array id="arr">
        <mx:Object label="Red" />
        <mx:Object label="Orange" />
        <mx:Object label="Yellow" />
        <mx:Object label="Green" />
        <mx:Object label="Blue" />
    </mx:Array>

    <mx:ApplicationControlBar dock="true">
        <mx:Form styleName="plain">
            <mx:FormItem label="tabWidth:">
                <mx:HSlider id="slider"
                        minimum="40"
                        maximum="120"
                        value="100"
                        snapInterval="1"
                        tickInterval="10"
                        liveDragging="true"
                        change="slider_change(event);" />
            </mx:FormItem>
        </mx:Form>
    </mx:ApplicationControlBar>

    <mx:TabBar id="tabBar"
            dataProvider="{arr}"
            tabWidth="100" />

</mx:Application>

Due to popular demand, here is the “same” example in a more ActionScript friendly format:

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/10/04/setting-the-tab-width-on-a-tabbar-control-in-flex/ -->
<mx:Application name="TabBar_tabWidth_test"
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white"
        initialize="init();">

    <mx:Script>
        <![CDATA[
            import mx.containers.ApplicationControlBar;
            import mx.containers.Form;
            import mx.containers.FormItem;
            import mx.controls.HSlider;
            import mx.controls.TabBar;
            import mx.events.SliderEvent;

            private var arr:Array;
            private var slider:HSlider;
            private var tabBar:TabBar;

            private function init():void {
                arr = [];
                arr.push({label:"Red"});
                arr.push({label:"Orange"});
                arr.push({label:"Yellow"});
                arr.push({label:"Green"});
                arr.push({label:"Blue"});

                slider = new HSlider();
                slider.minimum = 40;
                slider.maximum = 120;
                slider.value = 100;
                slider.snapInterval = 1;
                slider.tickInterval = 10;
                slider.liveDragging = true;
                slider.addEventListener(SliderEvent.CHANGE,
                            slider_change);

                var formItem:FormItem = new FormItem();
                formItem.label = "tabWidth:";
                formItem.addChild(slider);

                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.setStyle("tabWidth", slider.value);
                addChild(tabBar);
            }

            private function slider_change(evt:SliderEvent):void {
                tabBar.setStyle("tabWidth", evt.value);
            }
        ]]>
    </mx:Script>

</mx:Application>