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annotate OrthancStone/Sources/Scene2DViewport/UndoStack.h @ 1678:1393e3393a0b

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fix mpr sample
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 24 Nov 2020 07:40:19 +0100
parents 8563ea5d8ae4
children 9ac2a65d4172
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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) 2017-2020 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/shared_ptr.hpp>
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25
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26 #include <vector>
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27
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28 namespace OrthancStone
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29 {
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30 class MeasureCommand;
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31
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32 class UndoStack
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33 {
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34 public:
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35 UndoStack();
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36
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37 /**
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38 Stores a command :
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39 - this first trims the undo stack to keep the first numAppliedCommands_
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40 - then it adds the supplied command at the top of the undo stack
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41
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42 In other words, when a new command is pushed, all the undone (and not
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43 redone) commands are removed.
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44 */
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45 void PushCommand(boost::shared_ptr<MeasureCommand> command);
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46
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47 /**
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48 Undoes the command at the top of the undo stack, or throws if there is no
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49 command to undo.
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50 You can check "CanUndo" first to protect against extraneous redo.
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51 */
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52 void Undo();
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53
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54 /**
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55 Redoes the command that is just above the last applied command in the undo
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56 stack or throws if there is no command to redo.
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57 You can check "CanRedo" first to protect against extraneous redo.
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58 */
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59 void Redo();
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60
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61 /** selfexpl */
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62 bool CanUndo() const;
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63
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64 /** selfexpl */
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65 bool CanRedo() const;
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66
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67 private:
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68 std::vector<boost::shared_ptr<MeasureCommand> > commandStack_;
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69
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70 /**
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71 This is always between >= 0 and <= undoStack_.size() and gives the
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72 position where the controller is in the undo stack.
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73 - If numAppliedCommands_ > 0, one can undo
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74 - If numAppliedCommands_ < numAppliedCommands_.size(), one can redo
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75 */
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76 size_t numAppliedCommands_;
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77 };
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78 }