2 Copyright (C) 2000-2007 Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #ifndef __gtkmm2ext_dndtreeview_h__
21 #define __gtkmm2ext_dndtreeview_h__
25 #include <gtkmm/treeview.h>
26 #include <gtkmm/treeselection.h>
27 #include <gtkmm/selectiondata.h>
29 #include "gtkmm2ext/visibility.h"
33 template<class DataType>
34 struct /*LIBGTKMM2EXT_API*/ SerializedObjectPointers {
41 class LIBGTKMM2EXT_API DnDTreeViewBase : public Gtk::TreeView
48 void add_drop_targets (std::list<Gtk::TargetEntry>&);
49 void add_object_drag (int column, std::string type_name);
51 void on_drag_begin (Glib::RefPtr<Gdk::DragContext> const & context);
52 void on_drag_end (Glib::RefPtr<Gdk::DragContext> const & context);
54 bool on_button_press_event (GdkEventButton *ev) {
55 press_start_x = ev->x;
56 press_start_y = ev->y;
57 return TreeView::on_button_press_event (ev);
60 void on_drag_leave(const Glib::RefPtr<Gdk::DragContext>& context, guint time) {
61 suggested_action = context->get_suggested_action();
62 TreeView::on_drag_leave (context, time);
65 bool on_drag_motion(const Glib::RefPtr<Gdk::DragContext>& context, int x, int y, guint time) {
66 suggested_action = context->get_suggested_action();
67 return TreeView::on_drag_motion (context, x, y, time);
70 bool on_drag_drop(const Glib::RefPtr<Gdk::DragContext>& context, int x, int y, guint time);
72 void set_drag_column (int c) {
77 std::list<Gtk::TargetEntry> draggable;
78 Gdk::DragAction suggested_action;
80 std::string object_type;
87 DragData () : source (0) {}
89 Gtk::TreeView* source;
91 std::string object_type;
94 static DragData drag_data;
96 void start_object_drag () {
97 drag_data.source = this;
98 drag_data.data_column = data_column;
99 drag_data.object_type = object_type;
102 void end_object_drag () {
103 drag_data.source = 0;
104 drag_data.data_column = -1;
105 drag_data.object_type = "";
109 template<class DataType>
110 class /*LIBGTKMM2EXT_API*/ DnDTreeView : public DnDTreeViewBase
116 sigc::signal<void, const Glib::RefPtr<Gdk::DragContext>&, const Gtk::SelectionData&> signal_drop;
118 void on_drag_data_get(const Glib::RefPtr<Gdk::DragContext>& context, Gtk::SelectionData& selection_data, guint info, guint time) {
119 if (selection_data.get_target() == "GTK_TREE_MODEL_ROW") {
121 TreeView::on_drag_data_get (context, selection_data, info, time);
123 } else if (selection_data.get_target() == object_type) {
125 /* return a pointer to this object, which allows
126 * the receiver to call on_drag_data_received()
129 selection_data.set (8, (guchar*)&c, sizeof(void*));
133 void on_drag_data_received(const Glib::RefPtr<Gdk::DragContext>& context, int x, int y, const Gtk::SelectionData& selection_data, guint info, guint time) {
134 if (suggested_action) {
135 /* this is a drag motion callback. just update the status to
136 say that we are still dragging, and that's it.
138 suggested_action = Gdk::DragAction (0);
139 TreeView::on_drag_data_received (context, x, y, selection_data, info, time);
143 if (selection_data.get_target() == "GTK_TREE_MODEL_ROW") {
144 TreeView::on_drag_data_received (context, x, y, selection_data, info, time);
146 /* some kind of target type, usually 'object_type' added by the app,
147 * which will be handled by a signal handler */
148 for (std::list<Gtk::TargetEntry>::const_iterator i = draggable.begin(); i != draggable.end (); ++i) {
149 if (selection_data.get_target() == (*i).get_target()) {
150 signal_drop (context, selection_data);
151 context->drag_finish (true, false, time);
159 * This can be called by the Treeview itself or by some other
160 * object that wants to get the list of dragged items.
163 void get_object_drag_data (std::list<DataType>& l, Gtk::TreeView** source) const {
165 if (drag_data.source == 0) {
169 Glib::RefPtr<Gtk::TreeModel> model = drag_data.source->get_model();
171 Gtk::TreeSelection::ListHandle_Path selection = drag_data.source->get_selection()->get_selected_rows ();
173 for (Gtk::TreeSelection::ListHandle_Path::iterator x = selection.begin(); x != selection.end(); ++x) {
174 model->get_iter (*x)->get_value (drag_data.data_column, v);
178 *source = drag_data.source;
184 #endif /* __gtkmm2ext_dndtreeview_h__ */