Mercurial > hg > orthanc-stone

annotate OrthancStone/Sources/Scene2DViewport/OneGesturePointerTracker.cpp @ 1871:7053b8a0aaec

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 11 Jan 2022 11:18:48 +0100
parents 3889ae96d2e9
children 9c0adcc8feec
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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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23
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24 #include "OneGesturePointerTracker.h"
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25
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26 #include <OrthancException.h>
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27
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28 #include "../StoneException.h"
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29
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30 namespace OrthancStone
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31 {
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32 OneGesturePointerTracker::OneGesturePointerTracker(boost::weak_ptr<IViewport> viewport) :
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33 alive_(true),
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34 currentTouchCount_(1),
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35 viewport_(viewport)
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36 {
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37 }
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38
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39 IViewport::ILock* OneGesturePointerTracker::GetViewportLock()
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40 {
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41 boost::shared_ptr<IViewport> viewport = viewport_.lock();
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42 if (viewport)
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43 return viewport->Lock();
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44 else
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45 return NULL;
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46 }
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47
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48 void OneGesturePointerTracker::PointerUp(const PointerEvent& event)
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49 {
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50 // pointer up is only called for the LAST up event in case of a multi-touch
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51 // gesture
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52 ORTHANC_ASSERT(currentTouchCount_ > 0, "Wrong state in tracker");
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53 currentTouchCount_--;
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54 //LOG(TRACE) << "currentTouchCount_ becomes: " << currentTouchCount_;
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55 if (currentTouchCount_ == 0)
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56 {
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57 //LOG(TRACE) << "currentTouchCount_ == 0 --> alive_ = false";
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58 alive_ = false;
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59 }
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60 }
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62 void OneGesturePointerTracker::PointerDown(const PointerEvent& event)
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63 {
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64 // additional touches are not taken into account but we need to count
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65 // the number of active touches
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66 currentTouchCount_++;
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67 //LOG(TRACE) << "currentTouchCount_ becomes: " << currentTouchCount_;
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69 /**
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70 * 2019-12-06 (SJO): Patch to have consistent behavior when mouse
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71 * leaves the canvas while the tracker is still active, then
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72 * button is released while out-of-canvas. Such an event is not
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73 * caught (at least in WebAssembly), so we delete the tracker on
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74 * the next click inside the canvas.
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75 **/
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76 alive_ = false;
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77 }
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79 bool OneGesturePointerTracker::IsAlive() const
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80 {
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81 return alive_;
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82 }
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83 }