I need to display the datatable of a sqlite database in a simple grid view,
much like in WindowsForms'/WPF's datagridview, but with GTK#. I have been
trying to configure the GTK.TreeView to display the data properly, but with
no luck. The data is not displayed and I get an obscure error in the
Application output. I find it extremely strange that there is no
documentation on the subject.
I followed the example given here:
http://www.mono-project.com/GtkSharp_TreeView_Tutorial. First I create the
model (ListStore) by initializing it with the string type for the data of
every column. Then I append the columns of the data table to the tree view.
Then I engage the sqlite reader, and for every entry I add its data to the
model. Then I add a cell for each column pointing to the data. Finally, I
give the tree view its model.
However, this only manages to display the columns with no data. What I get
in the application output is this:
Gtk-CRITICAL **: gtk_tree_view_column_cell_layout_set_cell_data_func:
assertion `info != NULL' failed
Here is my code:
public void SetupUsers(Gtk.TreeView table)
{
Type[] types;
SqliteCommand cmd = new SqliteCommand("SELECT * FROM
"+Tables.USERS,
_cddapConn);
cmd.Connection.Open();
SqliteDataReader reader = cmd.ExecuteReader();
types = new Type[reader.FieldCount];
for(int i = 0; i < types.Length; i++)
types[i] = typeof(string);
Gtk.ListStore list = new Gtk.ListStore(types);
for(int i = 0; i < TblExaminees.SCHEMA.Length; i++)
{
table.AppendColumn(TblUsers.SCHEMA[i], new
Gtk.CellRendererText(),
"text");
}
while(reader.Read())
{
String[] rowData = new
String[TblUsers.SCHEMA.Length];
for(int index = 0; index <
TblUsers.SCHEMA.Length; index++)
{
rowData[index] =
reader.GetString(index);
table.Columns[index].SetCellDataFunc(new Gtk.CellRendererText(), new
Gtk.TreeCellDataFunc(renderExaminee));
}
list.AppendValues(rowData);
}
table.Model = list;
reader.Close();
cmd.Connection.Close();
}
protected void renderUser(Gtk.TreeViewColumn column,
Gtk.CellRenderer
cell, Gtk.TreeModel model, Gtk.TreeIter iter)
{
Console.WriteLine("got here");
(cell as Gtk.CellRendererText).Text =
(string)model.GetValue(iter,
Array.FindIndex(TblUsers.SCHEMA, item => item == column.Title ));
}
I appreciate your help.
P.S. I have tried to use table.Columns[index].AddAttribute(new
Gtk.CellRendererText(), "text", index); instead of setting the data func,
which just returns this similar error: Gtk-CRITICAL **:
gtk_tree_view_column_cell_layout_add_attribute: assertion `info != NULL'
failed
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