Aaron Geier wrote:
> Hello,
>
> I'm not an expert on gtkmm, but I'll try to take a stab at this one.
>
> >From what I understand of TreeView is that the TreeView is the display and
> >the TreeModel is the data that can be displayed by a TreeView.
>
> That being said, TreeView uses a class called CellRenderer[1] to display the
> view...
>
> So what you're attempting to do is add something that is not a CellRenderer
> to the TreeView display, which, I believe, cannot be done.
>
> You see, the TreeModel contains specific types of data (i.e. ustrings,
> integers, booleans, and doubles) and the TreeView has a way of displaying
> those types of data using CellRenderers. By default, if you use a column
> that is a ustring, it will choose a CellRenderText as the CellRenderer,
> unless you tell it to use a different CellRenderer.
>
> Does that make any sense at all?
>
> -Aaron Geier
>
>
Thanks Aaron for trying to answer my question. As I mentioned in my
original post, I have a series of "interconnected" classes (by
pointers). The connections are uni-directional which determines which
is the parent and which are "ancestors". Children, themselves can also
have children so the tree relationship is somewhat "intricate".
As I mentioned in my last post, I think I found a solution: What I've
done so far is to derive all the classes from a single base class
(though some have multiple inheritances) which I call "Element". I then
defined a class derived from Gtk::TreeModelColumnRecord class with a
single Gtk::TreeModelColumn<Element> member which looks like the following:
class Columns : public Gtk::TreeModelColumnRecord {
public:
Columns()
{ add(element); }
Gtk::TreeModelColumn<Element> element;
};
Columns columns;
I can now successfully create the TreeStore (the model) using something like
Gtk::RefPtr<Gtk::TreeStore> treeStoreRefPtr =
Gtk::TreeStore::create(columns);
I am also able to "treeStoreRefPtr->append()" rows, etc. within the tree
and set them by using code like the following:
Gtk::TreeStore::iterator rowIter = treeStoreRefPtr->append();
Gtk::TreeStore::Row row = (*rowIter);
row[columns.element] = <One of My classes>;
So so far, I seem to be able to build the model just fine.
What I was asking basically is: How can I have the TreeView "display"
these classes and as you mentioned, the TreeView uses CellRenderers. I
found this excerpt from Chap. 8 of programming guide:
Adding View Columns
You can use the |append_column()| method to tell the View that it
should display certain Model columns, in a certain order, with a
certain column title.
m_TreeView.append_column("Messages", m_Columns.m_col_text);
When using this simple |append_column()| override, the |TreeView|
will display the model data with an appropriate |CellRenderer|. For
instance, strings and numbers are shown in a simple |Gtk::Entry|
widget, and booleans are shown in a |Gtk::CheckButton|. This is
usually what you need. *For other column types you must either
connect a callback that converts your type into a string
representation, with |TreeViewColumn::set_cell_data_func()|, or
derive a custom |CellRenderer|.* Note that (unsigned) short is not
supported by default - You could use (unsigned) int or (unsigned)
long as the column type instead.
So I think I'll have to use the "set_cell_data_func()" in TreeViewColumn
or derive a custom CellRenderer as mentioned above. So far, I think
things are working. At first I didn't know where to start (it was a bit
overwhelming), but I think I should be able to figure things out now.
If you have any comments I'd appreciate them and I'll post again if I
get stuck. :-) Thanks again.
-Jose
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