Pesky loose coupling question

Question

Hey guys,
I have 3 files: main.mxml, registration.mxml, and
update.mxml. The registration is a custom canvas component with a
datagrid, and the update is a popup activated by clicking the
datagrid. I understand how to dispatch custom events, but I'm
having trouble dispatching from popup back to main.mxml where my
remote code is located. I can successfully dispatch objects with a
custom event from reg component to main. What am I doing wrong?
Should I just add a remote command in the registration component
and run a function in the registration? Doesn't seem like loose
coupling to me?

Answer 1

If your registration component is instantiated in main and
you dispatch an event that bubbles from registration to main, then
bubbling works. But forget about bubbling when dispatching an event
from a popup to any other component. You can do the following:
If you use a model (with Cairngorm, PureMVC ... or simply
Singleton), you can have an object in your model that extends
EventDispatcher and serves as a message target.
package com.mycompany.core.model
import flash.events.EventDispatcher;
// This class only serves as the target for messages that
concern objects that are not
// in the display list or that are in the display list but
cannot be reached by event bubbling
public class MessageTarget extends EventDispatcher
public function MessageTarget()
In your model:
// Message target
public var messageTarget:MessageTarget = new
MessageTarget();
In any component interested in some messages (e.g column
visibility) dispatched on the message target :
// Add event listener for column visibility change
this.model.messageTarget.addEventListener(ColumnVisibilityChangedEvent.COLUMN_VISIBILITY_ CHANGED,
this.onColumnVisibilityChanged);
Then, you can dispatch an event from anywhere that can be
listened to anywhere:
// Send Column Visibility Changed event
this.model.messageTarget.dispatchEvent(
new
ColumnVisibilityChangedEvent(ColumnVisibilityChangedEvent.COLUMN_VISIBILITY_CHANGED,
false, false));