Hi,
I am encountering an unexpected behavior in Gtk::TreeStore. I am
connecting a handler to signal_row_expanded to refresh the row
contents. To do this, I am simply removing the old contents and adding
children again. But when I expand the row in GUI, it doesn't get
expanded at all to show the children!
The following is the change to the book's tree view code
(examples/book/treeview/tree directory)
examplewindow.h
class ExampleWindow
{
...
// handler
void on_row_expanded(const Gtk::TreeModel::iterator & iter, const
Gtk::TreeModel::Path & path);
protected:
void add_children(const Gtk::TreeModel::Row & row);
void remove_children(const Gtk::TreeModel::Row & row);
...
}
examplewindow.cc
void ExampleWindow::on_row_expanded(const Gtk::TreeModel::iterator &
iter, const Gtk::TreeModel::Path & path)
{
remove_children(*iter);
add_children(*iter);
}
void ExampleWindow::remove_children(const Gtk::TreeModel::Row & row)
{
while(!row.children().empty())
m_refTreeModel->erase(row.children().begin());
}
void ExampleWindow::add_children(const Gtk::TreeModel::Row & row)
{
// add some children
Gtk::TreeModel::Row crow;
crow = *( m_refTreeModel->append(row.children()) );
crow[m_Columns.m_col_name] = row[m_Columns.m_col_name] + " child1";
crow = *( m_refTreeModel->append(row.children()) );
crow[m_Columns.m_col_name] = row[m_Columns.m_col_name] + " child2";
crow = *( m_refTreeModel->append(row.children()) );
crow[m_Columns.m_col_name] = row[m_Columns.m_col_name] + " child3";
}
The end result should be when I expand a row, it should show only the
above three children. While the GUI doesn't expand the row, the
children do get removed and added. Also, add_children() and
remove_children() are working as expected in isolation.
Any idea whats going wrong here?
With thanks
Ram
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