🚀 go-pugleaf

Christophe MINETTI wrote:

> I would like to know how to create an event at runtime;

Well you can't create the event at runtime since that would mean
generate executable code but you can attach an existing event or event
like method to a different object at runtime.

The easy way is to create the event is using the Object Inspector and a
dummy object. You then assign the event where it's needed at runtime.

So for your example at design time you could create a dummy TImage
called Image1 and give it an OnMouseMove event. Then at runtime you do:

  TImage * myImage=new TImage( this );
  myImage->OnMouseMove=Image1->OnMouseMove;

But alternatively you can create your own event handler by making it a
method of your form. For this I find it easiest to again first create
an event using the Object Inspector and then just copy the function
declaration with my own name:

 void __fastcall wibble(TObject *Sender, TShiftState Shift,
          int X, int Y);

..and of course write my own body for it.

Then you'd have:
  
  TImage * myImage=new TImage( this );
  myImage->OnMouseMove=wibble;

Events are really just slightly complicated function pointers and if
you use the above techniques you can ignore the complexity for the most
part.
  
-- 
Andrue Cope [TeamB]
[Bicester, Uk]
http://info.borland.com/newsgroups/guide.html