Yes, Gtk::Builder::get_widget_derived() calls the derived widget's
constructor with only the two parameters shown in the gtkmm tutorial.
The bug https://bugzilla.gnome.org/show_bug.cgi?id=134161 discusses this
issue.
I would probably solve a situation such as yours by splitting the
construction of the derived widget into the restricted constructor with
just two parameters + a DerivedWidget::init() function with other
parameters that I would call right after get_widget_derived().
An alternative: Make a get_data() function that can be called from the
derived widget's constructor.
Kjell
Den 2015-01-04 08:16, Adam Nielsen skrev:
Hi all,
In the example given here:
https://developer.gnome.org/gtkmm-tutorial/stable/sec-builder-using-derived-widgets.html.en
A call to Gtk::Builder::get_widget_derived() is used to create an
instance of the derived dialog class. The class then sets up the
widgets in its constructor.
However from the example it's unclear how, in a more complex program,
you would access data external to the class from within that
constructor.
For instance the example simply attaches an event handler to a button,
but in my situation I want to populate a ListBox with values stored in
a data structure loaded earlier in the application.
Normally I would pass the data structure as an extra parameter in the
constructor, so the constructor can access the information it needs to
set up the widgets appropriately. However
Gtk::Builder::get_widget_derived() seems to require a fixed constructor
form, so I can't supply any additional information to the constructor.
How is this situation typically handled? Is there a best-practice for
this scenario?
Many thanks,
Adam.
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