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NEWS.9.md: Fix typo and minor formatting changes. * etc/NEWS.9.md: Fix typo. Adjust whitespace. Use markdown syntax for code snippets.
author Markus Mützel <markus.muetzel@gmx.de>
date Wed, 05 Jun 2024 11:27:35 +0200
parents 2e484f9f1f18
children 4b601ca024d5
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1 ////////////////////////////////////////////////////////////////////////
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2 //
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3 // Copyright (C) 2011-2024 The Octave Project Developers
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4 //
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5 // See the file COPYRIGHT.md in the top-level directory of this
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6 // distribution or <https://octave.org/copyright/>.
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7 //
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8 // This file is part of Octave.
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9 //
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10 // Octave is free software: you can redistribute it and/or modify it
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11 // under the terms of the GNU General Public License as published by
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12 // the Free Software Foundation, either version 3 of the License, or
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13 // (at your option) any later version.
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14 //
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15 // Octave is distributed in the hope that it will be useful, but
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of
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17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 // GNU General Public License for more details.
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19 //
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20 // You should have received a copy of the GNU General Public License
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21 // along with Octave; see the file COPYING. If not, see
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22 // <https://www.gnu.org/licenses/>.
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23 //
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24 ////////////////////////////////////////////////////////////////////////
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25
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26 #if ! defined (octave_GenericEventNotify_h)
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27 #define octave_GenericEventNotify_h 1
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28
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29 #include <QSet>
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30
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31 class QEvent;
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32 class QObject;
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33 class QWidget;
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34
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35 OCTAVE_BEGIN_NAMESPACE(octave)
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36
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37 class GenericEventNotifyReceiver;
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38
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39 class GenericEventNotifySender
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40 {
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41 public:
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42 GenericEventNotifySender () : m_receivers () { }
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43 virtual ~GenericEventNotifySender () = default;
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44
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45 void addReceiver (GenericEventNotifyReceiver *r)
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46 { m_receivers.insert (r); }
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47
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48 void removeReceiver (GenericEventNotifyReceiver *r)
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49 { m_receivers.remove (r); }
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50
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51 protected:
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52 bool notifyReceiversBefore (QObject *obj, QEvent *evt);
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53 void notifyReceiversAfter (QObject *obj, QEvent *evt);
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54
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55 private:
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56 QSet<GenericEventNotifyReceiver *> m_receivers;
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57 };
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58
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59 class GenericEventNotifyReceiver
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60 {
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61 public:
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62 GenericEventNotifyReceiver () { }
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63 virtual ~GenericEventNotifyReceiver () = default;
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64
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65 virtual bool eventNotifyBefore (QObject *obj, QEvent *evt) = 0;
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66 virtual void eventNotifyAfter (QObject *obj, QEvent *evt) = 0;
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67 };
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68
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69 inline
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70 bool GenericEventNotifySender::notifyReceiversBefore (QObject *obj,
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71 QEvent *evt)
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72 {
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73 for (auto *r : m_receivers)
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74 if (r->eventNotifyBefore (obj, evt))
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75 return true;
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76
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77 return false;
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78 }
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79
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80 inline
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81 void GenericEventNotifySender::notifyReceiversAfter (QObject *obj,
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82 QEvent *evt)
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83 {
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84 for (auto *r : m_receivers)
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85 r->eventNotifyAfter (obj, evt);
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86 }
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87
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88 OCTAVE_END_NAMESPACE(octave)
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89
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90 #define DECLARE_GENERICEVENTNOTIFY_SENDER(T,B) \
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91 class T : public B, public GenericEventNotifySender \
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92 { \
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93 public: \
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94 T (QWidget *xparent) : B (xparent), GenericEventNotifySender () { } \
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95 ~ T () = default; \
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96 \
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97 bool event (QEvent *evt) \
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98 { \
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99 bool result = true; \
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100 if (! notifyReceiversBefore (this, evt)) \
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101 result = B::event (evt); \
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102 notifyReceiversAfter (this, evt); \
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103 return result; \
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104 } \
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105 }
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106
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107 #endif