La selección
To find out what rows the user has selected, get the Gtk::TreeView::Selection object from the TreeView, like so:
Glib::RefPtr<Gtk::TreeSelection> refTreeSelection =
m_TreeView.get_selection();- 9.4.1. Selección única o múltiple
- 9.4.2. Las filas seleccionadas
- 9.4.3. La señal «changed»
- 9.4.4. Evitar la selección de la fila
- 9.4.5. Cambiar la selección
9.4.1. Selección única o múltiple
By default, only single rows can be selected, but you can allow multiple selection by setting the mode, like so:
refTreeSelection->set_mode(Gtk::SELECTION_MULTIPLE);
9.4.2. Las filas seleccionadas
For single-selection, you can just call get_selected(), like so:
TreeModel::iterator iter = refTreeSelection->get_selected();
if(iter) //Si hay algo seleccionado
{
TreeModel::Row row = *iter;
//Hacer algo con la fila.
}For multiple-selection, you need to define a callback, and give it to selected_foreach(), selected_foreach_path(), or selected_foreach_iter(), like so:
refTreeSelection->selected_foreach_iter(
sigc::mem_fun(*this, &TheClass::selected_row_callback) );
void TheClass::selected_row_callback(
const Gtk::TreeModel::iterator& iter)
{
TreeModel::Row row = *iter;
//Hacer algo con la fila.
}9.4.3. La señal «changed»
To respond to the user clicking on a row or range of rows, connect to the signal like so:
refTreeSelection->signal_changed().connect(
sigc::mem_fun(*this, &Example_StockBrowser::on_selection_changed)
);9.4.4. Evitar la selección de la fila
Maybe the user should not be able to select every item in your list or tree. For instance, in the gtk-demo, you can select a demo to see the source code, but it doesn't make any sense to select a demo category.
To control which rows can be selected, use the set_select_function() method, providing a sigc::slot callback. For instance:
m_refTreeSelection->set_select_function( sigc::mem_fun(*this,
&DemoWindow::select_function) );Y luego
bool DemoWindow::select_function(
const Glib::RefPtr<Gtk::TreeModel>& model,
const Gtk::TreeModel::Path& path, bool)
{
const Gtk::TreeModel::iterator iter = model->get_iter(path);
return iter->children().empty(); // only allow leaf nodes to be selected
}9.4.5. Cambiar la selección
To change the selection, specify a Gtk::TreeModel::iterator or Gtk::TreeModel::Row, like so:
Gtk::TreeModel::Row row = m_refModel->children()[5]; //La quinta fila. if(row) refTreeSelection->select(row);
o
Gtk::TreeModel::iterator iter = m_refModel->children().begin() if(iter) refTreeSelection->select(iter);