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annotate OrthancStone/Sources/Scene2DViewport/UndoStack.h @ 1789:462d7a0e064e

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added line measures to sdl single frame viewer sample
author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 17 May 2021 11:55:21 +0200
parents 9ac2a65d4172
children 3889ae96d2e9
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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2021 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public
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18 * License along with this program. If not, see
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19 * <http://www.gnu.org/licenses/>.
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20 **/
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21
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22 #pragma once
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23
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24 #include <boost/noncopyable.hpp>
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25 #include <boost/shared_ptr.hpp>
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26
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27 #include <vector>
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28
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29 namespace OrthancStone
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30 {
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31 class MeasureCommand;
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32
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33 class UndoStack : public boost::noncopyable
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34 {
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35 public:
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36 UndoStack();
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37
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38 /**
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39 Stores a command :
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40 - this first trims the undo stack to keep the first numAppliedCommands_
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41 - then it adds the supplied command at the top of the undo stack
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42
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43 In other words, when a new command is pushed, all the undone (and not
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44 redone) commands are removed.
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45 */
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46 void PushCommand(boost::shared_ptr<MeasureCommand> command);
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47
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48 /**
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49 Undoes the command at the top of the undo stack, or throws if there is no
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50 command to undo.
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51 You can check "CanUndo" first to protect against extraneous redo.
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52 */
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53 void Undo();
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54
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55 /**
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56 Redoes the command that is just above the last applied command in the undo
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57 stack or throws if there is no command to redo.
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58 You can check "CanRedo" first to protect against extraneous redo.
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59 */
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60 void Redo();
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61
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62 /** selfexpl */
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63 bool CanUndo() const;
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64
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65 /** selfexpl */
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66 bool CanRedo() const;
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67
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68 private:
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69 std::vector<boost::shared_ptr<MeasureCommand> > commandStack_;
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70
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71 /**
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72 This is always between >= 0 and <= undoStack_.size() and gives the
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73 position where the controller is in the undo stack.
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74 - If numAppliedCommands_ > 0, one can undo
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75 - If numAppliedCommands_ < numAppliedCommands_.size(), one can redo
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76 */
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77 size_t numAppliedCommands_;
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78 };
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79 }