Re: [evolution-patches] Re: [Evolution-hackers] Re: GtkWidget events vs virtual methods?? [was Patch for bug 45826, please review]

[yuedong du <yuedong du sun com>]

patch commited in a11y, 1.4b and HEAD

On Fri, 2003-07-11 at 06:16, Ettore Perazzoli wrote:
> On Thu, 2003-07-10 at 06:04, Not Zed wrote:
> > Hmm, good point.  I've bounced this to evolution-hackers.
> > 
> > I have no idea, does anybody who understands Gtk+ out there have any
> > idea on this?
> 
> Overriding the virtual methods for signals is OK.  It's pretty common
> when you subclass widgets, eg. GtkToggleButton overrides the "clicked"
> signal that it inherits from GtkButton.
> 
> > I never understood why signals had class pointers in the first place.
> 
> The basic idea with signals is to have virtual methods whose behavior
> can be overloaded without having to subclass.  So they act like event
> notifications, but they are still virtual methods too.
> 
> The virtual method's implementation simply gets invoked when the signal
> is emitted (either before or after the signals' callbacks, depending on
> the signal's flags).
> 
> -- Ettore
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