ArtsAutosBooksBusinessEducationEntertainmentFamilyFashionFoodGamesGenderHealthHolidaysHomeHubPagesPersonal FinancePetsPoliticsReligionSportsTechnologyTravel
  • »
  • Technology»
  • Computers & Software»
  • Computer Science & Programming

Flex cairngorm overview and tutorial

Updated on March 27, 2011

Cairngorm is a framework in flex which is developed based on the front controller pattern, This framework is used to develop the rich interface applications (RIA) in flex. In a normal MVC framework such as struts, the controller role is played by a xml named struts-config.xml. In cairngorm there is no such xml is used. Instead a action script class should be created which would extend the FrontController class defined in the cairngorm framework. The workflow of cairnform framework in a flex application is explained below.

creating an application class

As you may already know that the flex application would load the .mxml file which is defined with the application tag as the home page, define a class which would extend the application class and then use the new class for defining the application the tag. This is as below. When the application starts loading, it would call the 'onCreationComplete' method in the below class.

import mx.core.Application;
/**
 * 
 * Main application class.
 * 
 */
  public class W2PApplicationClass extends Application
   {
	/**
		 * Starts application configuration process.   
		 * 
		 */
		protected function onCreationComplete() : void 
		{
		// write the logic to start loading the application.
		}
   }
<?xml version="1.0" encoding="utf-8"?>
<app:W2PApplicationClass
 xmlns:app="*"
 xmlns:mx="http://www.adobe.com/2006/mxml" 
</app:W2PApplicationClass>

Define the cairngorm events

As the workflow in flex cairngorm framework happens through cairrngorm events, create custom events which would extend the cairngorm event. An example is given below.

import com.adobe.cairngorm.control.CairngormEvent;

public class NavClickEvent extends CairngormEvent
 {
  public static var EVENT_NAV_CLICK : String = "navClick";
  
  public function NavClickEvent(state:String)
    {
	 super(EVENT_NAV_CLICK);
	 this.state = state;
    }
 }

Define command and responders

When a cairngorm event is dispatched, the event should be handled by a command. The mapping for a cairngorm event to a command will be defined in a controller class which extends the front controller class. This controller will be deined in the mxml file of application defined above.

import com.adobe.cairngorm.commands.ICommand;
import com.adobe.cairngorm.control.CairngormEvent;

public class NavClickCommand implements ICommand
  {
	public function execute(event : CairngormEvent) : void
	{
	// logic to handle the event
	}
  }
package com.personal.cairngorm.control

public class MyController extends FrontController
{
 addCommand(NavClickEvent.EVENT_NAV_CLICK, NavClickCommand);
}

The appliation.mxml file will include the controller as shown below. The controller would dispatch the event to the execute method of the command.

<app:W2PApplicationClass
xmlns:app="*"
	xmlns:mx="http://www.adobe.com/2006/mxml" 
	xmlns:view="com.deluxe.view.*"
	xmlns:control="com.personal.cairngorm.control.*"		
	layout="absolute" 
	creationComplete="onCreationComplete();">
<control:MyController id="controller" />
</app:W2PApplicationClass>

The remaining part is in another hub here.

Comments

    0 of 8192 characters used
    Post Comment

    • klanguedoc profile image

      Kevin Languedoc 6 years ago from Canada

      I have been developing with Adobe Flex for 4 years now but I have never used the Cairngorm framework. To provided a nice tutorial which I will try later this week. Thanks

    working

    This website uses cookies

    As a user in the EEA, your approval is needed on a few things. To provide a better website experience, hubpages.com uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

    For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at: "https://hubpages.com/privacy-policy#gdpr"

    Show Details
    Necessary
    HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
    LoginThis is necessary to sign in to the HubPages Service.
    Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
    AkismetThis is used to detect comment spam. (Privacy Policy)
    HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
    HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
    Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
    CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
    Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the googleapis.com or gstatic.com domains, for performance and efficiency reasons. (Privacy Policy)
    Features
    Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
    Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
    Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
    Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
    Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
    VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
    PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
    Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
    MavenThis supports the Maven widget and search functionality. (Privacy Policy)
    Marketing
    Google AdSenseThis is an ad network. (Privacy Policy)
    Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
    Index ExchangeThis is an ad network. (Privacy Policy)
    SovrnThis is an ad network. (Privacy Policy)
    Facebook AdsThis is an ad network. (Privacy Policy)
    Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
    AppNexusThis is an ad network. (Privacy Policy)
    OpenxThis is an ad network. (Privacy Policy)
    Rubicon ProjectThis is an ad network. (Privacy Policy)
    TripleLiftThis is an ad network. (Privacy Policy)
    Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
    Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
    Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
    Statistics
    Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
    ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
    Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)