Removing the vertical separator from the Halo ComboBox control in Flex 4

In a previous example, “Removing the vertical separator from the ComboBox control in Flex”, we saw how you could remove the vertical separator from the Flex ComboBox control by creating a custom ComboBox skin using ActionScript.

The following example shows how you can remove the vertical separator fro a Halo ComboBox control (with default Spark skin) in Flex 4 by creating a custom skin and setting the skin style.

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 www.adobe.com/products/flex/. To download the latest nightly build of the Flex 4 SDK, see 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.

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2009/07/11/removing-the-vertical-separator-from-the-halo-combobox-control-in-flex-4/ -->
<s:Application name="Halo_ComboBox_skin_test"
        xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:mx="library://ns.adobe.com/flex/halo">
 
    <mx:ComboBox id="comboBox"
            dataProvider="[The,Quick,Brown,Fox,Jumps,Over,The,Lazy,Dog]"
            skin="skins.CustomComboBoxSkin"
            horizontalCenter="0" verticalCenter="-60" />
 
</s:Application>

And the custom ComboBox skin class, skins/CustomComboBoxSkin.mxml, is as follows:

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2009/07/11/removing-the-vertical-separator-from-the-halo-combobox-control-in-flex-4/ -->
<local:SparkSkinForHalo name="CustomComboBoxSkin"
        xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:local="mx.skins.spark.*"
        minWidth="21" minHeight="21"
        alpha.disabled="0.5">
    <!-- states -->
    <local:states>
        <s:State name="up" />
        <s:State name="over" />
        <s:State name="down" />
        <s:State name="disabled" />
    </local:states>
 
    <fx:Script>
        /* Define the skin elements that should not be colorized. 
           For button, the graphics are colorized but the arrow is not. */
        static private const exclusions:Array = ["arrow"];
        override public function get colorizeExclusions():Array {
            return exclusions;
        }
 
        /* Define the symbol fill items that should be colored by the "symbolColor" style. */
        static private const symbols:Array = ["arrowFill1", "arrowFill2"];
        override public function get symbolItems():Array {
            return symbols
        }
 
        /* Define the border items.*/
        static private const borderItem:Array = ["borderEntry1", "borderEntry2"];
        override protected function get borderItems():Array {
            return borderItem;
        }
    </fx:Script>
 
    <!-- layer 1: shadow -->
    <s:Rect left="-1" right="-1" top="-1" bottom="-1" radiusX="2" radiusY="2">
        <s:fill>
            <s:LinearGradient rotation="90">
                <s:GradientEntry color="0x000000" 
                        color.down="0xFFFFFF"
                        alpha="0.01"
                        alpha.down="0" />
                <s:GradientEntry color="0x000000" 
                        color.down="0xFFFFFF" 
                        alpha="0.07"
                        alpha.down="0.5" />
            </s:LinearGradient>
        </s:fill>
    </s:Rect>
 
    <!-- layer 2: fill -->
    <s:Rect left="1" right="1" top="1" bottom="1" radiusX="2" radiusY="2">
        <s:fill>
            <s:LinearGradient rotation="90">
                <s:GradientEntry color="0xFFFFFF" 
                        color.over="0xBBBDBD" 
                        color.down="0xAAAAAA" 
                        alpha="0.85" />
                <s:GradientEntry color="0xD8D8D8" 
                        color.over="0x9FA0A1" 
                        color.down="0x929496" 
                        alpha="0.85" />
            </s:LinearGradient>
        </s:fill>
    </s:Rect>
 
    <!-- layer 3: fill lowlight -->
    <s:Rect left="1" right="1" bottom="1" height="9" radiusX="2" radiusY="2">
        <s:fill>
            <s:LinearGradient rotation="90">
                <s:GradientEntry color="0x000000" alpha="0.0099" />
                <s:GradientEntry color="0x000000" alpha="0.0627" />
            </s:LinearGradient>
        </s:fill>
    </s:Rect>
 
    <!-- layer 4: fill highlight -->
    <s:Rect left="1" right="1" top="1" height="9" radiusX="2" radiusY="2">
        <s:fill>
            <s:SolidColor color="0xFFFFFF" 
                    alpha="0.33" 
                    alpha.over="0.22" 
                    alpha.down="0.12" />
        </s:fill>
    </s:Rect>
 
    <!-- layer 5: highlight stroke (all states except down) -->
    <s:Rect left="1" right="1" top="1" bottom="1" radiusX="2" radiusY="2" excludeFrom="down">
        <s:stroke>
            <s:LinearGradientStroke rotation="90" weight="1">
                <s:GradientEntry color="0xFFFFFF" alpha.over="0.22" />
                <s:GradientEntry color="0xD8D8D8" alpha.over="0.22" />
            </s:LinearGradientStroke>
        </s:stroke>
    </s:Rect>
 
    <!-- layer 6: highlight stroke (down state only) -->
    <s:Rect left="1" top="1" bottom="1" width="1" includeIn="down">
        <s:fill>
            <s:SolidColor color="0x000000" alpha="0.07" />
        </s:fill>
    </s:Rect>
    <s:Rect right="1" top="1" bottom="1" width="1" includeIn="down">
        <s:fill>
            <s:SolidColor color="0x000000" alpha="0.07" />
        </s:fill>
    </s:Rect>
    <s:Rect left="2" top="1" right="2" height="1" includeIn="down">
        <s:fill>
            <s:SolidColor color="0x000000" alpha="0.25" />
        </s:fill>
    </s:Rect>
    <s:Rect left="1" top="2" right="1" height="1" includeIn="down">
        <s:fill>
            <s:SolidColor color="0x000000" alpha="0.09" />
        </s:fill>
    </s:Rect>
 
    <!-- layer 7: border - put on top of the fill so it doesn't disappear when scale is less than 1 -->
    <s:Rect left="0" right="0" top="0" bottom="0" width="69" height="20" radiusX="2" radiusY="2">
        <s:stroke>
            <s:LinearGradientStroke rotation="90" weight="1">
                <s:GradientEntry id="borderEntry1" 
                        alpha="0.5625"
                        alpha.down="0.6375" />
                <s:GradientEntry id="borderEntry2" 
                        alpha="0.75" 
                        alpha.down="0.85" />
            </s:LinearGradientStroke>
        </s:stroke>
    </s:Rect>
 
    <!-- layer 8: arrow -->
    <s:Path right="6" verticalCenter="0" id="arrow"
          data="M 4.0 4.0 L 4.0 3.0 L 5.0 3.0 L 5.0 2.0 L 6.0 2.0 L 6.0 1.0 L 7.0 1.0 L 7.0 0.0 L 0.0 0.0 L 0.0 1.0 L 1.0 1.0 L 1.0 2.0 L 2.0 2.0 L 2.0 3.0 L 3.0 3.0 L 3.0 4.0 L 4.0 4.0">
        <s:fill>
            <s:RadialGradient rotation="90" focalPointRatio="1">
                <s:GradientEntry id="arrowFill1" color="0" alpha="0.6" />
                <s:GradientEntry id="arrowFill2" color="0" alpha="0.8" />
            </s:RadialGradient>
        </s:fill>
    </s:Path>
 
</local:SparkSkinForHalo>

[HaloSparkSkins]

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.