Separating the view States

Hi all

I'm in following This example on LiveDocs Flex to create reports in ActionScript. Now, I want to separate the logic of the actionscript in a presentation model.

Presentation model pattern has been in a series of Articles by Paul WIlliams.

I'm confused about its implementation in these points:

  • When I put in AS relativeTo property, how will access an element defined in a display in the presentation model class?
  • How will bind the currentState to a variable in the model of my presentation?

Can someone give me please a summary of how to implement this?

Thanks and greetings

ShiVik

ShiVik,

Now, I understand perfectly what you are after. Unfortunately, in my opinion, using the States of Flex is really messy and it is often preferable to have the display updated directly from a model presenter, rather than having the updated view of the States which are updates to the model presenter. I also like to separate the model from the view and the controller. But since they are all in the blog on the presenter, I'll keep them together.

So what you want to do, is to have your point of view mxml to declare an instance of a presenter:

protected var model: PresenterModel = new PresenterModel();

PresenterModel has a property for each chart element property in the mxml view that must be updated:

public var user: UserVO = null;

PresenterModel has a method for each event of the GUI in mxml view that needs to be addressed:

public void showUser (index): void

{

user = userList.getItemAt (index) as UserVO;

}

Your view links components to the elements in the template:

Your view handles the events by calling methods on the model:

The effective way to show and hide according to the State of things is like this:

In the model:

public static const = "init INIT:String."

public static const NORMAL: String = "normal";

public static const ERROR: String = "error";

public var viewMode:String = INIT;

Notice:

For recovering and sending data, the PresenterModel can use Cairngorm events since you are using Cairngrom.

So, whenever there is interaction with the user, the event calls a method on the PresenterModel, and that the method updates the PresenterModel property, then the display updates via links.
This system (even if I use a different class to model and controller) worked very well for me on major projects from the beginning to the end. It does never messy.
Thank you
Philippe

Tags: Flex

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AdfcExceptionHandler>  ADFc: While handling an exception the application's exception handler threw a new exception.
javax.faces.application.ViewExpiredException: viewId:/folderUpload.jspx - ADF_FACES-30107:The view state of the page has expired.  Reload the page.
  at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._restoreView(LifecycleImpl.java:819)
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[Application termination requested.  Undeploying application DMSMultipleFileUploadUtility.]

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    Maroof Ahmed

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