Re: catching unfocus of a treeview row

[Ken Rastatter <krastatter sensotec com>]

On Sun, 2 Mar 2003 Emmanuel Saracco wrote:

> I would like to detect a focus lost on a treeview row. I catch the
> "cursor_changed" signal and test the state of the row in my callback
> with "gtk_tree_selection_iter_is_selected", but it always return me a
> true value if the row was previously selected, so I could not known the
> real state of a given row.

This is the trick I use to detect when the selection has changed.  I use the 
"select cursor row" signal to save the path of the selected row so that I can 
compare it the next time the "select cursor row" signal occurs.  

It works for GtkTreeView widgets that allow single selections.  I haven't 
considered multiple selections yet.

void
on_network_treeview_select_cursor_row  (GtkTreeView     *treeview,
                                        gpointer         user_data)
{
    extern GtkTreeStore *treestore;
    static GtkTreePath *lasttime_path;
    GtkTreePath *path;
    GtkTreeIter iter;

    g_printerr("select cursor row: ");

    // GET A PATH AND ITER OF THE SELECTED ROW
    gtk_tree_view_get_cursor(treeview, &path, NULL);
    gtk_tree_model_get_iter(GTK_TREE_MODEL(treestore), &iter, path);

    // IF THE SELECTED ROW HASN'T CHANGED SINCE LAST TIME...
    if (lasttime_path && (gtk_tree_path_compare(path, lasttime_path)==0))
    {
        g_printerr("same row as last time.\n");
    }
    else
    // ... ELSE KEEP A COPY OF THE PATH FOR NEXT TIME
    {
        g_printerr("a new row was selected.\n");
        if (lasttime_path)
            gtk_tree_path_free(lasttime_path);
        lasttime_path = gtk_tree_path_copy(path);
    }
}



--
Ken Rastatter, Design Engineer
Sensotec, Inc.
2080 Arlingate Lane, Columbus, Ohio, 43228-4112 USA

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