Container Events - Redux

Getting Started
1

Ok… I know there has to be a way to do this.
a) I have a container control, that contains a canvas
b) one of the properties of the CC is a custom class (not subclassed from a control), Call it “X”
c) What I need to be able to do. If a particular method in “X” does a particular action, I need it to raise an event that the “CC” can see and respond to (ie. invalidate the canvas

I have added an event defintion to “X”, but there is not Event Handler exposed in “CC”… what am I missing

CC.doSomething  // if this DID do something I need CC to react, without putting code in the main app

I do not wish to do something like this

If CC.doSomething then CC.Invalidate
2

Raise the event in the X class then receive it in the container using AddHandler. Make sure you do a remove handler when the container is closed.

3

Add the handler in code
Or drag an instance on to the CC in the layout editor

4

Ok… This is not working

CC has property of class “X”
Class “X” has an event definition “Z”

In the Constructor of CC I have

obj=new X
AddHandler obj.z, addressof me.handle_event_z

and in CC there is a method called “handle_event_z”

Error on AddHandler line is
Type Mismatch error. Expected delegate Delegate(X), but got delegate Delegate ( )

5

Add a parameter to me.handle_event_z of “sender as X”.

6

That seems to be the trick :slight_smile:
Thanks