Re: [gtkmm] Passing widgets

[Martin Schulze <martin-ml hippogriff de>]

Am 08.07.2004 12:12:31 schrieb(en) Linuxteam:
> Hi,
>
> I want to know how do I pass a GtkEntry widget on click of a button.  
> I
> have a
> callback function on click of a button. In that function, I want to
> access the
> text of a GtkEntry widget.
> My code is:
>
> ------------------------------------------------------------
> void window1::on_okbutton_clicked(GtkEntry *entry1)

Hi!

You can connect this function to a signal "clicked" it with:

yourbutton->signal_clicked().connect(sigc::bind(sigc::slot(*yourwindow, 
&window1::on_okbutton_clicked), yourentry));

sigc::bind() creates an adaptor that stores "yourentry" and passes it  
as an additional argument whenever the slot is executed by the signal.

Regards,

 Martin


> {
>     g_print(entry1.get_text());
> }
> ------------------------------------------------------------
>
> "entry1" is the name of the "GtkEntry" widget.
>
> When I try to compile the above code, it gives me the following  
> error:
>
> ------------------------------------------------------------
> window1_glade.cc: In constructor `window1_glade::window1_glade()':
> window1_glade.cc:94: error: no matching function for call to `
>    Glib::SignalProxy0<void>::connect(SigC::Slot1<void, _GtkEntry>)'
> /usr/include/gtkmm-2.0/glibmm/signalproxy.h:113: error: candidates
> are:
>    SigC::Connection Glib::SignalProxy0<R>::connect(const
> SigC::Slot0<R>&, bool)
>    [with R = void]
> /usr/include/sigc++-1.2/sigc++/object_slot.h: In static member
> function `static
>    typename SigC::Trait<T>::type SigC::ObjectSlot1_<R, P1,
> Obj>::proxy(typename
>    SigC::Trait<P1>::ref, void*) [with R = void, P1 = _GtkEntry, Obj =
>    window1_glade]':
> /usr/include/sigc++-1.2/sigc++/object_slot.h:111:   instantiated from
> `SigC::Slot1<R, P1> SigC::slot(O1&, R (O2::*)(P1)) [with R = void, P1
> =
> _GtkEntry, O1 = window1_glade, O2 = window1_glade]'
> window1_glade.cc:94:   instantiated from here
> /usr/include/sigc++-1.2/sigc++/object_slot.h:100: error: parameter
> type of
>    called function is incomplete
> /usr/include/sigc++-1.2/sigc++/object_slot.h:100: confused by earlier
> errors,
> bailing out
> make: *** [window1_glade.o] Error 1
> ------------------------------------------------------------
>
>
> I would also like to know if there is some complete tutorial  
> available
> for GTKMM.
>
> Regards,
> Vishal Kothari.
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