sensitivity handling

[Anon <walton60 cogeco ca>]

Hi i am writing an app and i'm not sure how to deal with sensitivity of
cut paste, and delete, actions.

I did the following provisionally.


primcb=gtk_widget_get_clipboard(mainwindow,
                                  GDK_SELECTION_PRIMARY);
          g_signal_connect(G_OBJECT (primcb),"owner-change",
                         G_CALLBACK(ownerchange_primary_cb),NULL);

THere are three objects which might have selectable areas. The
textbuffers, proof_buffer->text_buf  and msg_buf, as well as the
GtkTextEntry escape_entry.  proof_buffer->text_buf, and escape_entry are
editable by the user, and msg_buf is not. With this in mind for the
handler "ownwerchange_primary_cb" I did something like this (for cut
copy, and paste sensitivity)


static
void ownerchange_primary_cb(GtkClipboard *clipboard,
    GdkEvent *event,
    gpointer user_data){
  GObject *owner=gtk_clipboard_get_owner (clipboard);
  if(owner != NULL){
    if (owner == G_OBJECT (proof_buffer->text_buf)){
      //printf("owner is proof buffer!\n");
      gtk_action_group_set_sensitive(cutdel_actiongroup,TRUE);
      gtk_action_group_set_sensitive(copy_actiongroup,TRUE);
    }else if (owner==G_OBJECT(msg_buf)){
      //printf("owner is message buffer\n");
      gtk_action_group_set_sensitive(cutdel_actiongroup,FALSE);
      gtk_action_group_set_sensitive(copy_actiongroup,TRUE);
    }else if(owner==G_OBJECT(escape_entry)){
      gtk_action_group_set_sensitive(cutdel_actiongroup,TRUE);
      gtk_action_group_set_sensitive(copy_actiongroup,TRUE);
      //printf("owner is escape entry\n");
    }else{
      gtk_action_group_set_sensitive(cutdel_actiongroup,FALSE);
      gtk_action_group_set_sensitive(copy_actiongroup,FALSE);
      //printf("don't know owner!\n");
    }
  } else{
    gtk_action_group_set_sensitive(cutdel_actiongroup,FALSE);
    gtk_action_group_set_sensitive(copy_actiongroup,FALSE);
  }
}


For paste sensitivity i did this:

g_signal_connect(G_OBJECT (mainwindow),"set-focus",
                   G_CALLBACK(mainwin_focus_set),NULL);

mainwindow is a window btw. The handler "mainwin_focus_set" is this:
static
void mainwin_focus_set(GtkWindow *window,
                       GtkWidget *widget,
                       gpointer user_data){
  if(widget==mainview){
    //printf("main view focused on\n");
    gtk_action_group_set_sensitive(paste_actiongroup,TRUE);
  }else if (widget==messageview){
    gtk_action_group_set_sensitive(paste_actiongroup,FALSE);

    //printf("message view focused on\n");
  }else if(widget==escape_entry){
    gtk_action_group_set_sensitive(paste_actiongroup,TRUE);
    //printf("escape entry focuse upon\n");
  }else{
    gtk_action_group_set_sensitive(paste_actiongroup,FALSE);
    //printf("unknown focus\n");
  }
  
}


So can anyone tell me if i've dealt with action sensitivity the right
way?

Your help will be muchly appreciated.

Thank you very much,
   --Bikhu