Re: changing the content of a model/view/store at run time

[Phil Wolff <adiabat centurylink net>]

As indicated by the error message, liststore1 is a RefPtr to a ListStore 
model, which is a C++ entity that

    1) cannot be used as an argument to a gtk+ function, and

    2) cannot be dereferenced with the * operator.

At a more fundamental level, this approach is unnecessarily complicated. 
The entire contents of the function can be replace with a single statement:

    liststore1->clear ();


On 8/10/19 8:20 AM, pcr wrote:
> I have changed from a tree store to a list store now, and I have 
> working code, except for the last line in this call back used when a 
> radio button is clicked in order to erase the list store and replace 
> it with another at run time:
>
>   void ExampleWindow::on_rb2_clicked()
>  {
>     std::cout << "rb2 clicked" << std::endl;
>
>     typedef Gtk::TreeModel::Children type_children;
>     type_children children = liststore1->children();
>     type_children::iterator iter;
>     for(iter=children.begin(); iter!=children.end(); ++iter)
>                gtk_list_store_remove (*liststore1,*iter);
>
> }
>
> The compiler message I get is
>
> test3.cc: In member function ‘void ExampleWindow::on_rb2_clicked()’:
> test3.cc:104:27: error: no match for ‘operator*’ (operand type is 
> ‘Glib::RefPtr<Gtk::ListStore>’)
>     gtk_list_store_remove (*liststore1,*iter);
>
> So my question is, I suppose, what is the proper syntax for using 
> gtk_list_store_remove ???
>
> On 8/8/19 3:46 PM, pcr wrote:
> > I'm trying to learn how to iterate over model rows in a manner 
> > similar to the code segment in section 9.3 of the gnome gtkmm 
> > tutorial.  Consider me a newbie; the "something" I want to do below 
> > is delete/clear/erase a row - really all rows so I can display a new 
> > set of rows in response to a user action like changing a radio 
> > button.  But I haven't been able to do it. Here is the snippit from 
> > section 9.3:
> >
> > typedef Gtk::TreeModel::Children type_children; //minimise code length.
> > type_children children = refModel->children();
> > for(type_children::iterator iter = children.begin();
> >      iter != children.end(); ++iter)
> > {
> >    Gtk::TreeModel::Row row = *iter;
> >    //Do something with the row - see above for set/get.
> > }
> >
> > *I'm also confused by the following comment I found on line; I don't 
> > see how this can work with the above code either. ***
> > iterator Gtk::TreeStore:erase(const iterator& iter)
> >         Returns an iterator to the next row or end() if there is none"
> >
> > I hope you can help me .  Thanks, PCR
> >
> >
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>
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