[flexcoders] Re: Use of viewLocator and viewHelper

[mamatha_tn]

Thanks for the example.But I still have some questions.
1)Is viewHelper used to segregate as code from mxml?
2)Its not used in any of examples provided for Cairngorm 2 nor is it 
part of any discussion about cairngorm 2 architecture.Is it an 
optional feature retained from cairngorm 0.99?
3)If I dont have any need to manipulate the mxml file from other 
files(which you have mentioned below), should I still go ahead and 
create a viewHelper for each view? 

--- In flexcoders@yahoogroups.com, e baggg [EMAIL PROTECTED] wrote:

 //mainScreen.mxml
 ?xml version=1.0 encoding=utf-8?
 mx:VBox xmlns:mx=http://www.adobe.com/2006/mxml; width=100% 
height=100% 
 xmlns:viewHelper=com.myapp.view.* verticalGap=0 
 viewHelper:MainScreenViewHelper id=mainScreenViewHelper /
   mx:Label id=mylabel text=Hello World/
 /mx:VBox
 
 //MainScreenViewHelper
 package com.myapp.view
 {
 import org.nevis.cairngorm.view.ViewHelper;
 import com.communify.model.ModelLocator;
 
 /**
  * Gives a handle to main.mxml and its subcomponents
  */ 
 public class MainScreenViewHelper extends ViewHelper{
 private var model:ModelLocator = ModelLocator.getInstance
();
 public function MainScreenViewHelper(){
 super();
 }

 public function updateLabel(updatedString : String):void{
 Label(view.mylabel).text = updatedString;
 }
 
 }
 }
 
 So, the line of code viewHelper:MainScreenViewHelper 
id=mainScreenViewHelper / instantiates the ViewHelper class and 
registers it with the singleton class ViewLocator. This means that 
any class or mxml file can access the components of the 
MainScreen.mxml by calling:
 
 var viewHelper : MainScreenViewHelper = MainScreenViewHelper
(ViewLocator.getInstance().getViewHelper(mainScreenViewHelper));
 viewHelper.updateLabel(otherTextField.text);
   
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Re: [flexcoders] Re: Use of viewLocator and viewHelper

[Tom Chiverton]

On Thursday 31 August 2006 05:38, mamatha_tn wrote:
 1)Is viewHelper used to segregate as code from mxml?

Sort of, or interactions with the model (as) from the view (mxml).

 3)If I dont have any need to manipulate the mxml file from other
 files(which you have mentioned below), should I still go ahead and
 create a viewHelper for each view?

I can't see the point for trival views.

-- 
Tom Chiverton
Helping to interactively aggregate value-added action-items



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