Flex 4 Spark Panel - Hide the title bar

Question

I used the Spark panel to display an object inside a container. The panel and internal elements are created dynamically. (using ActionScript). I need to remove the panel title bar in actionscript. When I tried to remove this, I cannot hide the same.

Tried below.

• The style used (class name) and set headerheight = 0 .

• Cancel the panel component and use the property this.titleBar.visible = false .

But you can’t hide the title.

I used the Panel component and Flash Builder 4.5 for development.

If there is any other way to achieve this, please let me know.

Answer 1

It’s best to create your own skin and transfer header fragments from the skin. Collect sample very quickly.

This is your own skin; Created as a copy of PanelSkin with comments on visual elements.

 <?xml version="1.0" encoding="utf-8"?> <!-- ADOBE SYSTEMS INCORPORATED Copyright 2008 Adobe Systems Incorporated All Rights Reserved. NOTICE: Adobe permits you to use, modify, and distribute this file in accordance with the terms of the license agreement accompanying it. --> <!--- The default skin class for a Spark Panel container. @see spark.components.Panel @langversion 3.0 @playerversion Flash 10 @playerversion AIR 1.5 @productversion Flex 4 --> <s:SparkSkin xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:fb="http://ns.adobe.com/flashbuilder/2009" blendMode="normal" mouseEnabled="false" minWidth="131" minHeight="127" alpha.disabled="0.5" alpha.disabledWithControlBar="0.5"> <fx:Metadata> <![CDATA[ /** * @copy spark.skins.spark.ApplicationSkin#hostComponent */ [HostComponent("spark.components.Panel")] ]]> </fx:Metadata> <fx:Script fb:purpose="styling"> <![CDATA[ import mx.core.FlexVersion; /* Define the skin elements that should not be colorized. For panel, border and title background are skinned, but the content area, background, border, and title text are not. */ static private const exclusions:Array = ["background", "titleDisplay", "contentGroup", "controlBarGroup", "border"]; /* exclusions before Flex 4.5 for backwards-compatibility purposes */ static private const exclusions_4_0:Array = ["background", "titleDisplay", "contentGroup", "controlBarGroup"]; /** * @private */ override public function get colorizeExclusions():Array { // Since border is styleable via borderColor, no need to allow chromeColor to affect // the border. This is wrapped in a compatibility flag since this change was added // in Flex 4.5 if (FlexVersion.compatibilityVersion < FlexVersion.VERSION_4_5) { return exclusions_4_0; } return exclusions; } /** * @private */ override protected function initializationComplete():void { useChromeColor = true; super.initializationComplete(); } /** * @private */ override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void { if (getStyle("borderVisible") == true) { border.visible = true; background.left = background.top = background.right = background.bottom = 1; contents.left = contents.top = contents.right = contents.bottom = 1; } else { border.visible = false; background.left = background.top = background.right = background.bottom = 0; contents.left = contents.top = contents.right = contents.bottom = 0; } dropShadow.visible = getStyle("dropShadowVisible"); var cr:Number = getStyle("cornerRadius"); var withControls:Boolean = (currentState == "disabledWithControlBar" || currentState == "normalWithControlBar"); if (cornerRadius != cr) { cornerRadius = cr; dropShadow.tlRadius = cornerRadius; dropShadow.trRadius = cornerRadius; dropShadow.blRadius = withControls ? cornerRadius : 0; dropShadow.brRadius = withControls ? cornerRadius : 0; setPartCornerRadii(topMaskRect, withControls); setPartCornerRadii(border, withControls); setPartCornerRadii(background, withControls); } if (bottomMaskRect) setPartCornerRadii(bottomMaskRect, withControls); borderStroke.color = getStyle("borderColor"); borderStroke.alpha = getStyle("borderAlpha"); backgroundFill.color = getStyle("backgroundColor"); backgroundFill.alpha = getStyle("backgroundAlpha"); super.updateDisplayList(unscaledWidth, unscaledHeight); } /** * @private */ private function setPartCornerRadii(target:Rect, includeBottom:Boolean):void { target.topLeftRadiusX = cornerRadius; target.topRightRadiusX = cornerRadius; target.bottomLeftRadiusX = includeBottom ? cornerRadius : 0; target.bottomRightRadiusX = includeBottom ? cornerRadius : 0; } private var cornerRadius:Number; ]]> </fx:Script> <s:states> <s:State name="normal" /> <s:State name="disabled" /> <s:State name="normalWithControlBar" stateGroups="withControls" /> <s:State name="disabledWithControlBar" stateGroups="withControls" /> </s:states> <!-- drop shadow can't be hittable so it stays sibling of other graphics --> <!--- @private --> <s:RectangularDropShadow id="dropShadow" blurX="20" blurY="20" alpha="0.32" distance="11" angle="90" color="#000000" left="0" top="0" right="0" bottom="0"/> <!-- drop shadow can't be hittable so all other graphics go in this group --> <s:Group left="0" right="0" top="0" bottom="0"> <!-- top group mask --> <!--- @private --> <s:Group left="1" top="1" right="1" bottom="1" id="topGroupMask" > <!--- @private --> <s:Rect id="topMaskRect" left="0" top="0" right="0" bottom="0"> <s:fill> <s:SolidColor alpha="0"/> </s:fill> </s:Rect> </s:Group> <!-- bottom group mask --> <!--- @private --> <s:Group left="1" top="1" right="1" bottom="1" id="bottomGroupMask" includeIn="normalWithControlBar, disabledWithControlBar"> <!--- @private --> <s:Rect id="bottomMaskRect" left="0" top="0" right="0" bottom="0"> <s:fill> <s:SolidColor alpha="0"/> </s:fill> </s:Rect> </s:Group> <!-- layer 1: border --> <!--- @private --> <s:Rect id="border" left="0" right="0" top="0" bottom="0" > <s:stroke> <!--- @private --> <s:SolidColorStroke id="borderStroke" weight="1" /> </s:stroke> </s:Rect> <!-- layer 2: background fill --> <!--- Defines the appearance of the PanelSkin class background. --> <s:Rect id="background" left="1" top="1" right="1" bottom="1"> <s:fill> <!--- @private Defines the PanelSkin class background fill. The default color is 0xFFFFFF. --> <s:SolidColor id="backgroundFill" color="#FFFFFF"/> </s:fill> </s:Rect> <!-- layer 3: contents --> <!--- Contains the vertical stack of titlebar content and controlbar. --> <s:Group left="1" right="1" top="1" bottom="1" id="contents"> <s:layout> <s:VerticalLayout gap="0" horizontalAlign="justify" /> </s:layout> <!--- @private --> <!-- <s:Group id="topGroup" mask="{topGroupMask}"> --> <!-- layer 0: title bar fill --> <!--- @private --> <!-- <s:Rect id="tbFill" left="0" right="0" top="0" bottom="1"> <s:fill> <s:LinearGradient rotation="90"> <s:GradientEntry color="0xE2E2E2" /> <s:GradientEntry color="0xD9D9D9" /> </s:LinearGradient> </s:fill> </s:Rect> --> <!-- layer 1: title bar highlight --> <!--- @private --> <!-- <s:Rect id="tbHilite" left="0" right="0" top="0" bottom="0"> <s:stroke> <s:LinearGradientStroke rotation="90" weight="1"> <s:GradientEntry color="0xEAEAEA" /> <s:GradientEntry color="0xD9D9D9" /> </s:LinearGradientStroke> </s:stroke> </s:Rect> --> <!-- layer 2: title bar divider --> <!--- @private --> <!-- <s:Rect id="tbDiv" left="0" right="0" height="1" bottom="0"> <s:fill> <s:SolidColor color="0xC0C0C0" /> </s:fill> </s:Rect> --> <!-- layer 3: text --> <!--- @copy spark.components.Panel#titleDisplay --> <!-- <s:Label id="titleDisplay" maxDisplayedLines="1" left="9" right="3" top="1" bottom="0" minHeight="30" verticalAlign="middle" textAlign="start" fontWeight="bold"> </s:Label> --> <!-- </s:Group> --> <!-- Note: setting the minimum size to 0 here so that changes to the host component's size will not be thwarted by this skin part minimum size. This is a compromise, more about it here: http://bugs.adobe.com/jira/browse/SDK-21143 --> <!--- @copy spark.components.SkinnableContainer#contentGroup --> <s:Group id="contentGroup" width="100%" height="100%" minWidth="0" minHeight="0"> </s:Group> <!--- @private --> <s:Group id="bottomGroup" minWidth="0" minHeight="0" includeIn="normalWithControlBar, disabledWithControlBar" > <s:Group left="0" right="0" top="0" bottom="0" mask="{bottomGroupMask}"> <!-- layer 0: control bar divider line --> <s:Rect left="0" right="0" top="0" height="1" alpha="0.22"> <s:fill> <s:SolidColor color="0x000000" /> </s:fill> </s:Rect> <!-- layer 1: control bar highlight --> <s:Rect left="0" right="0" top="1" bottom="0"> <s:stroke> <s:LinearGradientStroke rotation="90" weight="1"> <s:GradientEntry color="0xE5E5E5" /> <s:GradientEntry color="0xD8D8D8" /> </s:LinearGradientStroke> </s:stroke> </s:Rect> <!-- layer 2: control bar fill --> <s:Rect left="1" right="1" top="2" bottom="1"> <s:fill> <s:LinearGradient rotation="90"> <s:GradientEntry color="0xDADADA" /> <s:GradientEntry color="0xC5C5C5" /> </s:LinearGradient> </s:fill> </s:Rect> </s:Group> <!-- layer 3: control bar --> <!--- @copy spark.components.Panel#controlBarGroup --> <s:Group id="controlBarGroup" left="0" right="0" top="1" bottom="1" minWidth="0" minHeight="0"> <s:layout> <s:HorizontalLayout paddingLeft="10" paddingRight="10" paddingTop="7" paddingBottom="7" gap="10" /> </s:layout> </s:Group> </s:Group> </s:Group> </s:Group> </s:SparkSkin> 

And this application:

 <?xml version="1.0" encoding="utf-8"?> <s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx"> <fx:Declarations> <!-- Place non-visual elements (eg, services, value objects) here --> </fx:Declarations> <s:VGroup> <s:Panel /> <s:Panel skinClass="PanelNoTitleBar"/> </s:VGroup> </s:WindowedApplication> 

The first panel displays the original skin; the second panel displays the user skin; No title.

Answer 2

Skinning is general advice, and apparently this is the intended design. Another answer gives an excellent job of showing this method.

However, there is also a good subclassical solution to the relevant issue: Flex 4 spark Panel has an ugly gray top . This may be enough if you want to remove the title bar.