Handlers

[rifter1818]

If i have an event with multiple handlers, how can i controll which handler is called first (or actually most important last). The context is this, i am programming an RPG and i want to have a message center, the mainmodule Raises a RENDER event when it is ready to render (pretty simple), two modules controll this event one is the Message center and the other could be one of 4 depending opon the game state (Menu,World,City,Battle) these change by having an addhandler/remove handler system execute whenever the gamestate property changes. What i want is for the Message center to be rendered last at all times.

[Iceplug]

Why don't you just add one handler to one procedure and have that event procedure call the event that you originally wanted to be called with the second handle?

I would assume that the event handler that is assigned first will be called first. (I've never tried it though)

[Joe Mamma]

If i have an event with multiple handlers' date=' how can i controll which handler is called first (or actually most important last). The context is this, i am programming an RPG and i want to have a message center, the mainmodule Raises a RENDER event when it is ready to render (pretty simple), two modules controll this event one is the Message center and the other could be one of 4 depending opon the game state (Menu,World,City,Battle) these change by having an addhandler/remove handler system execute whenever the gamestate property changes. What i want is for the Message center to be rendered last at all times.[/quote']

 

might I suggest staged events. . .

 

have PreRendering, Rendering and PostRendering events. . .

 

PreRendering Events are consumed by all objects that need to be cofigured before rendering. . .

Rendering are consumed in a DoRender method Call and are sequence inspecific.

and PostRendering are consumed only after a succesful call to DoRender

 

 

 
protected virtual void DoRender 
{
 // Actual Rendering Code here
if (Rendering != null)
  Rendering(this, EventArgs.Empty);
}

public void Render
{
 if (PreRendering != null)
PreRendering(this, EventArgs.Empty);
 DoRender();
 if (PostRendering != null)
PostRendering(this, EventArgs.Empty);
}

 

many object have BeforeChange, Changing and After Change events. . . a similar design.

 

you could even define your own Event Args class to pass back usefull information

[TechnoTone]

might I suggest staged events. . .

 

have PreRendering, Rendering and PostRendering events. . .

Nice. I wouldn't have thought of that.

[rifter1818]

Thanks

 

I think i might just set up those events.