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annotate OrthancStone/Sources/Scene2DViewport/IFlexiblePointerTracker.h @ 1972:9c0adcc8feec

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refactoring to simplify OneGesturePointerTracker
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 28 Oct 2022 16:21:28 +0200
parents 7053b8a0aaec
children 5a434f5889f8
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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
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24 #pragma once
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25
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26 #include "PredeclaredTypes.h"
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27
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28 #include "../Scene2D/PointerEvent.h"
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31 namespace OrthancStone
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32 {
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33 /**
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34 This interface represents a flexible mouse tracker that can respond to
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35 several events and is not automatically deleted upon mouse up or when touch
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36 interaction is suspended : for instance, a stateful tracker with a two-step
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37 interaction like: click & drag --> mouse up --> drag --> mouse click
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38 (for instance, for an angle measuring tracker or an ellipse tracker)
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39 */
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40 class IFlexiblePointerTracker : public boost::noncopyable
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41 {
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42 public:
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43 virtual ~IFlexiblePointerTracker() {}
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44
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45 /**
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46 This method will be repeatedly called during user interaction
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47 */
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48 virtual void PointerMove(const PointerEvent& event,
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49 const Scene2D& scene) = 0;
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50
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51 /**
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52 This method will be called when a touch/pointer is removed (mouse up,
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53 pen lift, finger removed...)
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54 */
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55 virtual void PointerUp(const PointerEvent& event,
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56 const Scene2D& scene) = 0;
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57
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58 /**
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59 This method will be called when a touch/pointer is added (mouse down,
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60 pen or finger press)
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61
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62 Important note: the initial pointer down that leads to creating the
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63 tracker is NOT sent to the tracker.
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64
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65 Thus, if you count the PointerDown vs PointerUp, there will be an extra
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66 PointerUp.
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67 */
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68 virtual void PointerDown(const PointerEvent& event,
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69 const Scene2D& scene) = 0;
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71 /**
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72 This method will be repeatedly called by the tracker owner (for instance,
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73 the application) to check whether the tracker must keep on receiving
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74 interaction or if its job is done and it should be deleted.
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75 */
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76 virtual bool IsAlive() const = 0;
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77
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78 /**
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79 This will be called if the tracker needs to be dismissed without committing
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80 its changes to the underlying model. If the model has been modified during
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81 tracker lifetime, it must be restored to its initial value
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82 */
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83 virtual void Cancel() = 0;
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84 };
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85 }