1/*
2* Copyright (c) 2018 (https://github.com/phase1geo/Minder)
3*
4* This program is free software; you can redistribute it and/or
5* modify it under the terms of the GNU General Public
6* License as published by the Free Software Foundation; either
7* version 2 of the License, or (at your option) any later version.
8*
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 GNU
12* General Public License for more details.
13*
14* You should have received a copy of the GNU General Public
15* License along with this program; if not, write to the
16* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17* Boston, MA 02110-1301 USA
18*
19* Authored by: Trevor Williams <phase1geo@gmail.com>
20*/
21
22using Gtk;
23
24public class UndoNodeLink : UndoItem {
25
26  Node  _node;
27  Node? _old_link;
28  Node? _new_link;
29
30  /* Constructor for a node name change */
31  public UndoNodeLink( Node n, Node? old_link ) {
32    base( _( "node link change" ) );
33    _node     = n;
34    _old_link = old_link;
35    _new_link = _node.linked_node;
36  }
37
38  /* Undoes a node image change */
39  public override void undo( DrawArea da ) {
40    _node.linked_node = _old_link;
41    da.queue_draw();
42    da.auto_save();
43  }
44
45  /* Redoes a node image change */
46  public override void redo( DrawArea da ) {
47    _node.linked_node = _new_link;
48    da.queue_draw();
49    da.auto_save();
50  }
51
52}
53