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List:       gtk-app-devel
Subject:    Sharing Variables in GTK+, & Re: State changing of Toggle Buttons
From:       Muthiah Annamalai <dearestchum () yahoo ! co ! in>
Date:       2005-05-31 5:28:50
Message-ID: 20050531052850.15213.qmail () web8404 ! mail ! in ! yahoo ! com
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Hi Michal,
This might be the solution, if I understand you right.

General information.
If you write C code, and want to access lots of
variables from a Callback, then there are a few simple
ways.

1: Make all the variables global, so you can access
them anywhere[function] in C.

2: Make a single global structure and have its
elements
as the necessary widgets. This is followed in LibGlade
initialization policies, in the function
glade_xml_get_widget(xml_ptr,wid_name);

3: Use g_object_set_data(obj,name,ext_ptr) to save
some 
reference to ext_ptr with this obj. This is similar to
doing 
           obj["name"] = &ext_ptr; in C++ or any OOP
language.

To get the data (the operation obj["name"] in C++/OOP)
we have to use  
(typecast as necessary ) g_object_get_data(obj,name);



Re: State changing of Toggle Buttons
------------------------------------
Specific information.

/*You have 2 toggle btns t1 & t2.
  In you main function add this code. */

Simple solution: Make t1 & t2 global variables, so you
can access them anywhere.

[good] Complex solution: Make a reference of t1 with
t2. like this.

g_object_set_data(G_OBJECT(t1),"t2",t2);
g_object_set_data(G_OBJECT(t2),"t1",t1);

This creates reference of t2 with t1, and vice verca.

Now in your callback for code t1 do this.

int t1_activated(GtkWidget *t1,void *data)
{
  GtkWidget *t2;
  t2=g_object_get_data(G_OBJECT(t1),"t2");
  if(!t2)
  { g_message("T2 reference not found\n");
  }
 /* you have t1 & t2 now! */
}

Add similar CB code for t2.

Cheers
Muthu.



--- Michal Porzuczek <mporzuczek@gmail.com> wrote:
> Hi,
> 
> I was wondering if it is possible to set a Toggle
> Button's state to
> something else when you are inside another Toogle
> Button's callback. I
> know there is the gtk_toggle_button_set_active
> method but that
> requires you to have the GtkToggleButton. Is there
> another method that
> only uses the Widget to change its state? Or is
> there an easy way of
> accessing the GtkToggleButton from the Widget?
> 
> Thanks in advance
> 
> Michal
> _______________________________________________
> gtk-app-devel-list mailing list
> gtk-app-devel-list@gnome.org
>
http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
> 


		
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