Re: send a manual ceated signal to a window or widget
- From: Murray Cumming <murrayc murrayc com>
- To: Kjell Ahlstedt <kjell ahlstedt bredband net>
- Cc: "gtkmm-list gnome org" <gtkmm-list gnome org>
- Subject: Re: send a manual ceated signal to a window or widget
- Date: Sat, 20 Dec 2014 22:04:50 +0100
On Sat, 2014-12-20 at 11:51 +0100, Kjell Ahlstedt wrote:
[snip]
As you've seen by now there are emit functions in glib. I don't know
why none of them have been wrapped in a C++ method in glibmm. If it
shall be added, I think the most natural location is in the
Glib::SignalProxy classes. Then you could emit a signal with a call
such as
bool handled = widget->signal_button_press_event().emit(event);
If you like, you can file a bug in Bugzilla and suggest it should be
added. I don't know if there is a good reason for not doing it.
[snip]
I've always thought that encourages messing about with the internals of
a widget. Widget's don't expect their own signals to be emitted at
arbitrary times. When there's a real need for application code to cause
a widget's signal to be emitted, there's usually a method that does
that. But that's still fairly rare because it's so specifically about
something internal to the widget - that fragile implementation-dependent
stuff doesn't really belong in a well-designed API.
Usually, if someone wants to emit a widget's signal, the conversation
should first be about what they want to actually achieve.
--
Murray Cumming
murrayc murrayc com
www.murrayc.com
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