Setting text alignment on a Spark TextArea control in Flex 4

The following example shows how you can set the text alignment and text direction in a Spark TextArea control in Flex 4 by setting the textAlign and direction styles.

Full code after the jump.

The following example(s) require Flash Player 10 and the Adobe Flex 4 SDK. To download the Adobe Flash Builder 4 trial, see http://www.adobe.com/products/flex/. To download the latest nightly build of the Flex 4 SDK, see http://opensource.adobe.com/wiki/display/flexsdk/Download+Flex+4.
For more information on getting started with Flex 4 and Flash Builder 4, see the official Adobe Flex Team blog.

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/10/22/setting-text-alignment-on-an-fxtextarea-control-in-flex-gumbo/ -->
<Application name="FxTextArea_textAlign_test"
        xmlns="http://ns.adobe.com/mxml/2009"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <Script>
        <![CDATA[
            import flashx.textLayout.formats.Direction;
            import flashx.textLayout.formats.TextAlign;
        ]]>
    </Script>

    <Declarations>
        <Array id="textAlignDP">
            <String>{TextAlign.START}</String>
            <String>{TextAlign.LEFT}</String>
            <String>{TextAlign.CENTER}</String>
            <String>{TextAlign.RIGHT}</String>
            <String>{TextAlign.END}</String>
            <String>{TextAlign.JUSTIFY}</String>
        </Array>
        <Array id="directionDP">
            <String>{Direction.LTR}</String>
            <String>{Direction.RTL}</String>
        </Array>
        <String id="lorem" source="data/lorem.html" />
    </Declarations>

    <ApplicationControlBar dock="true">
        <Form styleName="plain">
            <FormItem label="textAlign:">
                <ComboBox id="textAlignComboBox"
                        dataProvider="{textAlignDP}" />
            </FormItem>
            <FormItem label="direction:">
                <ComboBox id="directionComboBox"
                        dataProvider="{directionDP}" />
            </FormItem>
        </Form>
    </ApplicationControlBar>

    <FxTextArea id="fxTextArea"
            content="{lorem}"
            textAlign="{textAlignComboBox.selectedItem}"
            direction="{directionComboBox.selectedItem}"
            widthInChars="80"
            heightInLines="25"
            marginTop="20" />

</Application>

View source is enabled in the following example.

You can also set the textAlign and direction styles 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/2008/10/22/setting-text-alignment-on-an-fxtextarea-control-in-flex-gumbo/ -->
<Application name="FxTextArea_textAlign_test"
        xmlns="http://ns.adobe.com/mxml/2009"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <Style>
        FxTextArea {
            textAlign: "justify";
            direction: "rtl";
            marginTop: 20;
        }
    </Style>

    <Declarations>
        <String id="lorem" source="data/lorem.html" />
    </Declarations>

    <FxTextArea id="fxTextArea"
            content="{lorem}"
            widthInChars="80"
            heightInLines="25" />

</Application>

Or, you can set the textAlign and direction styles using ActionScript, as seen in the following example:

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/10/22/setting-text-alignment-on-an-fxtextarea-control-in-flex-gumbo/ -->
<Application name="FxTextArea_textAlign_test"
        xmlns="http://ns.adobe.com/mxml/2009"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <Script>
        <![CDATA[
            import flashx.textLayout.formats.Direction;
            import flashx.textLayout.formats.TextAlign;
            import mx.events.ListEvent;

            private function textAlignComboBox_change(evt:ListEvent):void {
                var value:String = evt.currentTarget.selectedItem;
                fxTextArea.setStyle("textAlign", value);
            }

            private function directionComboBox_change(evt:ListEvent):void {
                var value:String = evt.currentTarget.selectedItem;
                fxTextArea.setStyle("direction", value);
            }
        ]]>
    </Script>

    <Declarations>
        <Array id="textAlignDP">
            <String>{TextAlign.START}</String>
            <String>{TextAlign.LEFT}</String>
            <String>{TextAlign.CENTER}</String>
            <String>{TextAlign.RIGHT}</String>
            <String>{TextAlign.END}</String>
            <String>{TextAlign.JUSTIFY}</String>
        </Array>
        <Array id="directionDP">
            <String>{Direction.LTR}</String>
            <String>{Direction.RTL}</String>
        </Array>
        <String id="lorem" source="data/lorem.html" />
    </Declarations>

    <ApplicationControlBar dock="true">
        <Form styleName="plain">
            <FormItem label="textAlign:">
                <ComboBox id="textAlignComboBox"
                        dataProvider="{textAlignDP}"
                        change="textAlignComboBox_change(event);" />
            </FormItem>
            <FormItem label="direction:">
                <ComboBox id="directionComboBox"
                        dataProvider="{directionDP}"
                        change="textAlignComboBox_change(event)" />
            </FormItem>
        </Form>
    </ApplicationControlBar>

    <FxTextArea id="fxTextArea"
            content="{lorem}"
            widthInChars="80"
            heightInLines="25"
            marginTop="20" />

</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/2008/10/22/setting-text-alignment-on-an-fxtextarea-control-in-flex-gumbo/ -->
<Application name="FxTextArea_textAlign_test"
        xmlns="http://ns.adobe.com/mxml/2009"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white"
        initialize="init();">

    <Declarations>
        <String id="lorem" source="data/lorem.html" />
    </Declarations>

    <Script>
        <![CDATA[
            import flashx.textLayout.formats.Direction;
            import flashx.textLayout.formats.TextAlign;
            import mx.events.ListEvent;
            import mx.controls.ComboBox;
            import mx.components.FxTextArea;
            import mx.containers.Form;
            import mx.containers.FormItem;
            import mx.containers.ApplicationControlBar;

            private var textAlignDP:Array;
            private var directionDP:Array;
            private var textAlignComboBox:ComboBox;
            private var directionComboBox:ComboBox;
            private var fxTextArea:FxTextArea;

            private function init():void {
                textAlignDP = [];
                textAlignDP.push(TextAlign.START);
                textAlignDP.push(TextAlign.LEFT);
                textAlignDP.push(TextAlign.CENTER);
                textAlignDP.push(TextAlign.RIGHT);
                textAlignDP.push(TextAlign.END);
                textAlignDP.push(TextAlign.JUSTIFY);

                directionDP = [];
                directionDP.push(Direction.LTR);
                directionDP.push(Direction.RTL);

                textAlignComboBox = new ComboBox();
                textAlignComboBox.dataProvider = textAlignDP;
                textAlignComboBox.addEventListener(ListEvent.CHANGE,
                            textAlignComboBox_change);

                directionComboBox = new ComboBox();
                directionComboBox.dataProvider = directionDP;
                directionComboBox.addEventListener(ListEvent.CHANGE,
                            directionComboBox_change);

                var formItem1:FormItem = new FormItem();
                formItem1.label = "textAlign:";
                formItem1.addChild(textAlignComboBox);

                var formItem2:FormItem = new FormItem();
                formItem2.label = "direction:";
                formItem2.addChild(directionComboBox);

                var form:Form = new Form();
                form.styleName = "plain";
                form.addChild(formItem1);
                form.addChild(formItem2);

                var appControlBar:ApplicationControlBar;
                appControlBar = new ApplicationControlBar();
                appControlBar.dock = true;
                appControlBar.addChild(form);
                addChildAt(appControlBar, 0);

                fxTextArea = new FxTextArea();
                fxTextArea.content = lorem;
                fxTextArea.widthInChars = 80;
                fxTextArea.heightInLines = 25;
                fxTextArea.setStyle("marginTop", 20);
                addChild(fxTextArea);
            }

            private function textAlignComboBox_change(evt:ListEvent):void {
                var value:String = evt.currentTarget.selectedItem;
                fxTextArea.setStyle("textAlign", value);
            }

            private function directionComboBox_change(evt:ListEvent):void {
                var value:String = evt.currentTarget.selectedItem;
                fxTextArea.setStyle("direction", value);
            }
        ]]>
    </Script>

</Application>

This entry is based on a beta version of the Flex 4 SDK and therefore is very likely to change as development of the Flex SDK continues. The API can (and will) change causing examples to possibly not compile in newer versions of the Flex 4 SDK.