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annotate OrthancStone/Sources/Scene2DViewport/OneGesturePointerTracker.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 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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22
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23 #pragma once
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24
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25 #include "IFlexiblePointerTracker.h"
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27 #include "../Viewport/IViewport.h"
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28
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29 #include <Compatibility.h> // For ORTHANC_OVERRIDE
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31 #include <boost/shared_ptr.hpp>
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32 #include <boost/weak_ptr.hpp>
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33
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34 namespace OrthancStone
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35 {
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36 /**
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37 This base is class allows to write simple trackers that deal with single
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38 drag gestures with only one touch. It is *not* suitable for multi-touch and
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39 multi-state trackers where various mouse operations need to be handled.
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41 In order to write such a tracker:
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42 - subclass this class
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43 - you may store the initial click/touch position in the constructor
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44 - implement PointerMove to react to pointer/touch events
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45 - implement Cancel to restore the state at initial tracker creation time
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47 */
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48 class OneGesturePointerTracker : public IFlexiblePointerTracker
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49 {
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50 private:
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51 bool alive_;
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52 int currentTouchCount_;
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54 protected:
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55 boost::weak_ptr<IViewport> viewport_;
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56
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57 /**
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58 This will return a scoped lock to the viewport.
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59 If the viewport does not exist anymore, then nullptr is returned.
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60 */
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61 IViewport::ILock* GetViewportLock();
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62
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63 public:
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64 explicit OneGesturePointerTracker(boost::weak_ptr<IViewport> viewport);
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65
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66 virtual void PointerUp(const PointerEvent& event) ORTHANC_OVERRIDE;
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67
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68 virtual void PointerDown(const PointerEvent& event) ORTHANC_OVERRIDE;
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70 virtual bool IsAlive() const ORTHANC_OVERRIDE;
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71 };
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72 }
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73