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Copyright (C) 2000-2007 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#ifndef __gtkmm2ext_dndtreeview_h__
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#define __gtkmm2ext_dndtreeview_h__
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#include <gtkmm/treeview.h>
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#include <gtkmm/treeselection.h>
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#include <gtkmm/selectiondata.h>
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template<class DataType>
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struct SerializedObjectPointers {
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class DnDTreeViewBase : public Gtk::TreeView
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void add_drop_targets (std::list<Gtk::TargetEntry>&);
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void add_object_drag (int column, std::string type_name);
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void on_drag_begin (Glib::RefPtr<Gdk::DragContext> const & context) {
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Gtk::TreeView::on_drag_begin (context);
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void on_drag_leave(const Glib::RefPtr<Gdk::DragContext>& context, guint time) {
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suggested_action = context->get_suggested_action();
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TreeView::on_drag_leave (context, time);
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bool on_drag_motion(const Glib::RefPtr<Gdk::DragContext>& context, int x, int y, guint time) {
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suggested_action = context->get_suggested_action();
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return TreeView::on_drag_motion (context, x, y, time);
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bool on_drag_drop(const Glib::RefPtr<Gdk::DragContext>& context, int x, int y, guint time);
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std::list<Gtk::TargetEntry> draggable;
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Gdk::DragAction suggested_action;
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std::string object_type;
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DragData () : source (0) {}
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Gtk::TreeView* source;
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std::string object_type;
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static DragData drag_data;
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void start_object_drag () {
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drag_data.source = this;
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drag_data.data_column = data_column;
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drag_data.object_type = object_type;
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template<class DataType>
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class DnDTreeView : public DnDTreeViewBase
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sigc::signal<void,const std::list<DataType>&,Gtk::TreeView*,int,int,Glib::RefPtr<Gdk::DragContext>&> signal_drop;
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void on_drag_data_get(const Glib::RefPtr<Gdk::DragContext>& context, Gtk::SelectionData& selection_data, guint info, guint time) {
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if (selection_data.get_target() == "GTK_TREE_MODEL_ROW") {
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TreeView::on_drag_data_get (context, selection_data, info, time);
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} else if (selection_data.get_target() == object_type) {
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/* we don't care about the data passed around by DnD, but
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we have to provide something otherwise it will stop.
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selection_data.set (8, (guchar*)&c, 1);
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void on_drag_data_received(const Glib::RefPtr<Gdk::DragContext>& context, int x, int y, const Gtk::SelectionData& selection_data, guint info, guint time) {
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if (suggested_action) {
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/* this is a drag motion callback. just update the status to
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say that we are still dragging, and that's it.
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suggested_action = Gdk::DragAction (0);
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TreeView::on_drag_data_received (context, x, y, selection_data, info, time);
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if (selection_data.get_target() == "GTK_TREE_MODEL_ROW") {
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TreeView::on_drag_data_received (context, x, y, selection_data, info, time);
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} else if (selection_data.get_target() == object_type) {
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end_object_drag (const_cast<Glib::RefPtr<Gdk::DragContext>& > (context), x, y);
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/* some kind of target type added by the app, which will be handled by a signal handler */
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* This can be called by the Treeview itself or by some other
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* object that wants to get the list of dragged items.
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void get_object_drag_data (std::list<DataType>& l, Gtk::TreeView** source) {
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if (drag_data.source == 0) {
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Glib::RefPtr<Gtk::TreeModel> model = drag_data.source->get_model();
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Gtk::TreeSelection::ListHandle_Path selection = drag_data.source->get_selection()->get_selected_rows ();
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for (Gtk::TreeSelection::ListHandle_Path::iterator x = selection.begin(); x != selection.end(); ++x) {
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model->get_iter (*x)->get_value (drag_data.data_column, v);
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*source = drag_data.source;
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void end_object_drag (Glib::RefPtr<Gdk::DragContext>& context, int x, int y) {
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std::list<DataType> l;
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Gtk::TreeView* source;
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get_object_drag_data (l, &source);
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signal_drop (l, source, x, y, context);
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#endif /* __gtkmm2ext_dndtreeview_h__ */