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Chapter 9. The TreeView widget | 
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| Drag and Drop | ||
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Chapter 9. The TreeView widget |
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Gtk::TreeView already implements simple drag-and-drop
when used with the Gtk::ListStore or
Gtk::TreeStore models. If necessary, it also allows you
to implement more complex behaviour when items are dragged and dropped, using
the normal Drag and Drop API.
If you call Gtk::TreeView::set_reorderable() then your
TreeView's items can be moved within the treeview itself. This is demonstrated
in the TreeStore example.
However, this does not allow you any control of which items can be dragged, and where they can be dropped. If you need that extra control then you might create a derived Gtk::TreeModel from Gtk::TreeStore or Gtk::ListStore and override the Gtk::TreeDragSource::row_draggable() and Gdk::TreeDragDest::row_drop_possible() virtual methods. You can examine the Gtk::TreeModel::Paths provided and allow or disallow dragging or dropping by returning true or false.
This is demonstrated in the drag_and_drop example.
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