Flex - Accordian Control
Introduction
The Accordian control is a navigator container which has a collection of child containers, but only one of them at a time is visible.
Class declaration
Following is the declaration for mx.containers.Accordian class:
public class Accordion
extends Container
implements IHistoryManagerClient, IFocusManagerComponent
Public properties
| S.N. | Property & Description |
|---|---|
| 1 | headerRenderer : IFactory A factory used to create the navigation buttons for each child. |
| 2 | historyManagementEnabled : Boolean If set to true, this property enables history management within this Accordion container. |
| 3 | resizeToContent : Boolean If set to true, this Accordion automatically resizes to the size of its current child. |
| 4 | selectedChild : INavigatorContent A reference to the currently visible child container. |
| 5 | selectedIndex : int The zero-based index of the currently visible child container. |
Protected properties
| S.N. | Property & Description |
|---|---|
| 1 | contentHeight : Number [read-only] The height of the area, in pixels, in which content is displayed. |
| 2 | contentWidth : Number [read-only] The width of the area, in pixels, in which content is displayed. |
Public methods
| S.N. | Method & Description |
|---|---|
| 1 | Accordion() Constructor. |
| 2 | getHeaderAt(index:int):Button Returns a reference to the navigator button for a child container. |
| 3 | loadState(state:Object):void Loads the state of this object. |
| 4 | saveState():Object Saves the state of this object. |
Events
| S.N. | Event & Description |
|---|---|
| 1 | change Dispatched when the selected child container changes. |
Methods inherited
This class inherits methods from the following classes:
mx.core.Container
mx.core.UIComponent
mx.core.FlexSprite
flash.display.Sprite
flash.display.DisplayObjectContainer
flash.display.InteractiveObject
flash.display.DisplayObject
flash.events.EventDispatcher
Object
Flex Accordian Control Example
Let us follow the following steps to check usage of Accordian control 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="Complex Controls Demonstration"
fontSize="40" color="0x777777" styleName="heading"/>
<s:Panel id="accordianPanel" title="Using Accordian"
width="500" height="300" >
<s:layout>
<s:HorizontalLayout gap="10" verticalAlign="middle"
horizontalAlign="center"/>
</s:layout>
<mx:Accordion id="accordion" width="95%" height="90%">
<s:NavigatorContent label="Section 1" width="100%"
height="100%">
<s:VGroup verticalAlign="middle" horizontalAlign="center"
width="100%" height="100%">
<s:Label text="Contents for Section 1"/>
</s:VGroup>
</s:NavigatorContent>
<s:NavigatorContent label="Section 2" width="100%"
height="100%">
<s:VGroup verticalAlign="middle" horizontalAlign="center"
width="100%" height="100%">
<s:Label text="Contents for Section 2"/>
</s:VGroup>
</s:NavigatorContent>
<s:NavigatorContent label="Section 3" width="100%"
height="100%">
<s:VGroup verticalAlign="middle" horizontalAlign="center"
width="100%" height="100%">
<s:Label text="Contents for Section 3"/>
</s:VGroup>
</s:NavigatorContent>
<s:NavigatorContent label="Section 4" width="100%"
height="100%">
<s:VGroup verticalAlign="middle" horizontalAlign="center"
width="100%" height="100%">
<s:Label text="Contents for Section 4"/>
</s:VGroup>
</s:NavigatorContent>
</mx:Accordion>
</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, this will produce following result: [ Try it online ]
