1 /*
2  * erasetiles.h
3  * Copyright 2009, Thorbjørn Lindeijer <thorbjorn@lindeijer.nl>
4  *
5  * This file is part of Tiled.
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License as published by the Free
9  * Software Foundation; either version 2 of the License, or (at your option)
10  * any later version.
11  *
12  * This program is distributed in the hope that it will be useful, but WITHOUT
13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
15  * more details.
16  *
17  * You should have received a copy of the GNU General Public License along with
18  * this program. If not, see <http://www.gnu.org/licenses/>.
19  */
20 
21 #pragma once
22 
23 #include "undocommands.h"
24 
25 #include <QHash>
26 #include <QRegion>
27 #include <QUndoCommand>
28 
29 namespace Tiled {
30 
31 class Tile;
32 class TileLayer;
33 
34 class MapDocument;
35 
36 class EraseTiles : public QUndoCommand
37 {
38 public:
39     EraseTiles(MapDocument *mapDocument,
40                TileLayer *tileLayer,
41                const QRegion &region);
42     ~EraseTiles() override;
43 
44     /**
45      * Sets whether this undo command can be merged with an existing command.
46      */
setMergeable(bool mergeable)47     void setMergeable(bool mergeable)
48     { mMergeable = mergeable; }
49 
50     void undo() override;
51     void redo() override;
52 
id()53     int id() const override { return Cmd_EraseTiles; }
54     bool mergeWith(const QUndoCommand *other) override;
55 
56 private:
57     struct LayerData
58     {
59         void mergeWith(const LayerData &o);
60 
61         TileLayer *mErasedCells = nullptr;
62         QRegion mRegion;
63     };
64 
65     MapDocument *mMapDocument;
66     QHash<TileLayer*, LayerData> mLayerData;
67     bool mMergeable;
68 };
69 
70 } // namespace Tiled
71