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annotate OrthancStone/Sources/Scene2DViewport/UndoStack.h @ 1928:c73e696967b0 StoneWebViewer-2.3

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StoneWebViewer-2.3
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 24 Mar 2022 09:08:51 +0100
parents 7053b8a0aaec
children 07964689cb0b
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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) 2017-2022 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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22
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23 #pragma once
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24
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25 #include <boost/noncopyable.hpp>
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26 #include <boost/shared_ptr.hpp>
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27
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28 #include <vector>
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29
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30 namespace OrthancStone
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31 {
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32 class MeasureCommand;
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33
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34 class UndoStack : public boost::noncopyable
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35 {
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36 public:
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37 UndoStack();
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38
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39 /**
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40 Stores a command :
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41 - this first trims the undo stack to keep the first numAppliedCommands_
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42 - then it adds the supplied command at the top of the undo stack
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43
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44 In other words, when a new command is pushed, all the undone (and not
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45 redone) commands are removed.
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46 */
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47 void PushCommand(boost::shared_ptr<MeasureCommand> command);
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48
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49 /**
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50 Undoes the command at the top of the undo stack, or throws if there is no
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51 command to undo.
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52 You can check "CanUndo" first to protect against extraneous redo.
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53 */
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54 void Undo();
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55
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56 /**
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57 Redoes the command that is just above the last applied command in the undo
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58 stack or throws if there is no command to redo.
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59 You can check "CanRedo" first to protect against extraneous redo.
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60 */
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61 void Redo();
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62
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63 /** selfexpl */
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64 bool CanUndo() const;
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65
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66 /** selfexpl */
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67 bool CanRedo() const;
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68
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69 private:
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70 std::vector<boost::shared_ptr<MeasureCommand> > commandStack_;
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71
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72 /**
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73 This is always between >= 0 and <= undoStack_.size() and gives the
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74 position where the controller is in the undo stack.
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75 - If numAppliedCommands_ > 0, one can undo
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76 - If numAppliedCommands_ < numAppliedCommands_.size(), one can redo
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77 */
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78 size_t numAppliedCommands_;
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79 };
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80 }