Dependency injection for GUI components

[Lori]

Hi all,

we have been using the springframework for Java for a long time now. I wouldn't call me an expert but i have some detailed knowledge especially when it comes to the web and mvc part.

For some recent projects and developments we are using the great Flex for building RIA-Applications.
What i like most about it is its intuitive MXML syntax which lets you create a complex UI in a very simple way.

To come to my question: I have a problem with understanding how an ApplicationContext based app with lots of standalone objects and a gui app with lots of nested components can be combined.

To provide a simple example of what i am facing right now i give you:

1. The Gui

1.a "MainApp"

<?xml version="1.0" ?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:local="*">
	<local:NewsComponent />
	<local:UsersComponent />
</mx:Application>

1.b "NewsComponent"

<?xml version="1.0" encoding="utf-8"?>
<mx:Panel xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:local="*">
	
	<local:DataManager id="dataManager" />

	<mx:DataGrid dataProvider="{dataManager.news}" />
</mx:Panel>

1.c "UsersComponent"

<?xml version="1.0" encoding="utf-8"?>
<mx:Panel xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:local="*">
	
	<local:DataManager id="dataManager" />

	<mx:DataGrid dataProvider="{dataManager.users}" />
</mx:Panel>

2. The "DataManger"

package
{
	public class DataManager
	{
		private var news:ArrayCollection; // assume getter and setter
		private var users:ArrayCollection; // assume getter and setter
	}
}

3. The ApplicationContext definition

<?xml version="1.0" encoding="utf-8"?>
<objects xmlns="http://www.pranaframework.org/objects"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.pranaframework.org/objects http://www.pranaframework.org/schema/objects/prana-objects-0.6.xsd">
    
		<object id="dataManager" class="DataManager" />
		
		<object id="usersComponent" class="UsersComponent">
			<property name="dataManager" ref="dataManager" />
		</object>
		<object id="newsComponent" class="NewsComponent">
			<property name="dataManager" ref="dataManager" />
		</object>
</objects>

Now here is my challange: (if it really is )
Where and when do i create and load the application context?
Can i stick to that wonderful MXML Syntax and create guis with nested components that are objects of the app-context?

[NeilT]

Hi lori thanks for your reply to my post. If you have a look at the blog link I put in that post towards the bottom christophe outlines a way of injecting dependencies into nested components
Hope this helps and this forum stays busy