Flex - Panel

Introduction

The Panel class is a container that includes a title bar, a caption, a border, and a content area for its children.

Class Declaration

Following is the declaration for spark.components.Panel class −

public class Panel
   extends SkinnableContainer

Public Properties

Sr.No	Property & Description
1	controlBarContent : Array The set of components to include in the control bar area of the Panel container.
2	controlBarLayout : LayoutBase Defines the layout of the control bar area of the container.
3	controlBarVisible : Boolean If true, the control bar is visible.
4	title : String Title or caption displayed in the title bar.

Public Methods

Sr.No	Method & Description
1	Panel() Constructor.

Methods Inherited

This class inherits methods from the following classes −

spark.components.SkinnableContainer
spark.components.supportClasses.SkinnableContainerBase
spark.components.supportClasses.SkinnableComponent
mx.core.UIComponent
mx.core.FlexSprite
flash.display.Sprite
flash.display.DisplayObjectContainer
flash.display.InteractiveObject
flash.display.DisplayObject
flash.events.EventDispatcher
Object

Flex Panel Example

Let us follow the following steps to check usage of Panel in a Flex application by creating a test application −

Step	Description
1	Create a project with a name HelloWorld under a package com.tutorialspoint.client as explained in the Flex - Create Application chapter.
2	Modify HelloWorld.mxml as explained below. Keep rest of the files unchanged.
3	Compile and run the application to make sure business logic is working as per the requirements.

Following is the content of the modified mxml file src/com.tutorialspoint/HelloWorld.mxml.

<?xml version = "1.0" encoding = "utf-8"?>
<s:Application xmlns:fx = "http://ns.adobe.com/mxml/2009"
   xmlns:s = "library://ns.adobe.com/flex/spark"
   xmlns:mx = "library://ns.adobe.com/flex/mx
   width = "100%" height = "100%" minWidth = "500" minHeight = "500">

   <fx:Style source = "/com/tutorialspoint/client/Style.css" />
   <s:BorderContainer width = "630" height = "480" id = "mainContainer"
      styleName = "container">
      <s:VGroup width = "100%" height = "100%" gap = "50"
         horizontalAlign = "center" verticalAlign = "middle">
         <s:Label id = "lblHeader" text = "Layout Panels Demonstration"
            fontSize = "40" color = "0x777777" styleName = "heading" />

         <s:Panel id = "panelPanel" title = "Using Panel" width = "500"
            height = "300">
            <s:layout>
               <s:HorizontalLayout  gap = "10"
                  verticalAlign = "middle" horizontalAlign = "center" />
            </s:layout>

            <s:Panel title = "Basic Layout Panel" top = "0"
               left = "5" height = "200" width = "150" >
               <s:BorderContainer width = "50" height = "50"
                  borderWeight = "2" color = "0x323232" top = "0" />
               <s:BorderContainer width = "50" height = "50"
                  borderWeight = "2" color = "0x323232" top = "55" />
               <s:BorderContainer width = "50" height = "50"
                  borderWeight = "2" color = "0x323232" top = "110" />
            </s:Panel>

            <s:Panel title = "Horizontal Layout Panel" top = "0"
               left = "5" height = "200" width = "170" >
               <s:layout>
                  <s:HorizontalLayout/>
               </s:layout>
               
               <s:BorderContainer width = "50" height = "50"
                  borderWeight = "2" color = "0x323232" top = "0" />
               <s:BorderContainer width = "50" height = "50"
                  borderWeight = "2" color = "0x323232" top = "55" />
               <s:BorderContainer width = "50" height = "50"
                  borderWeight = "2" color = "0x323232" top = "110" />
            </s:Panel>
            
            <s:Panel title = "Vertical Layout Panel" top = "0"
               left = "5" height = "200" width = "150" >
               <s:layout>
                  <s:VerticalLayout />
               </s:layout>
               
               <s:BorderContainer width = "50" height = "50"
                  borderWeight = "2" color = "0x323232" top = "0" />
               <s:BorderContainer width = "50" height = "50"
                  borderWeight = "2" color = "0x323232" top = "55" />
               <s:BorderContainer width = "50" height = "50"
                  borderWeight = "2" color = "0x323232" top = "110" />
            </s:Panel>
         </s:Panel>
      </s:VGroup>
   </s:BorderContainer>
</s:Application>

Once you are ready with all the changes done, let us compile and run the application in normal mode as we did in Flex - Create Application chapter. If everything is fine with your application, it will produce the following result: [ Try it online ]

flex_layout_panels.htm