FW: Re: [gtkmm] mirroring actions in a user interface

[erik_ohrnberger dme net]

Tim,
	Many thanks for your suggestion.  It's exactly the way that I did
it, and it works beautifully.

	Thanks again,
		Erik.

> -----Original Message-----
> From: Ohrnberger, Erik 
> Sent: Thursday, May 20, 2004 3:04 PM
> To: Ohrnberger, Erik
> Subject: Re: [gtkmm] mirroring actions in a user interface
> 
> 
> erik_ohrnberger dme net wrote:
> 
> > What is the best way to make sure that each user action 
> applied to the first
> > notebook gets propagated to all the other notebooks?
> 
> What you're trying to do here is called "Observer Design 
> Pattern", which 
> is very common in user interface work.  I strongly recommend 
> picking-up 
> a copy of the book "Design Patterns" by Gamma, et al, which 
> covers this 
> and other patterns in detail.
> 
> The thing that makes gtkmm stand out as a UI toolkit is that 
> the signal 
> system encourages you to Do The Right Thing when you come across 
> Observer situations.  In your case, you will create a signal 
> or signals 
> that will be emitted when user actions mandate notebook 
> modifications. 
> Then, every notebook connects to that signal, updating itself 
> when the 
> signal is emitted.  You can have as few or as many notebooks as 
> required, and they will all be automatically updated when changes are 
> made to the first notebook.
> 
> Cheers,
> Tim Shead
>