pv/globalsettings.hpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2017 Soeren Apel <soeren@apelpie.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifndef PULSEVIEW_GLOBALSETTINGS_HPP
  21 #define PULSEVIEW_GLOBALSETTINGS_HPP
  22
  23 #include <functional>
  24 #include <map>
  25
  26 #include <QSettings>
  27 #include <QString>
  28 #include <QVariant>
  29
  30 using std::function;
  31 using std::map;
  32 using std::multimap;
  33
  34 namespace pv {
  35
  36 class GlobalSettings : public QSettings
  37 {
  38         Q_OBJECT
  39
  40 public:
  41         static const QString Key_View_AlwaysZoomToFit;
  42         static const QString Key_View_ColouredBG;
  43         static const QString Key_View_StickyScrolling;
  44         static const QString Key_View_ShowSamplingPoints;
  45
  46 public:
  47         GlobalSettings();
  48
  49         static void register_change_handler(const QString key,
  50                 function<void(QVariant)> cb);
  51
  52         void setValue(const QString& key, const QVariant& value);
  53
  54         /**
  55          * Begins the tracking of changes. All changes will
  56          * be recorded until stop_tracking() is called.
  57          * The change tracking is global and doesn't support nesting.
  58          */
  59         void start_tracking();
  60
  61         /**
  62          * Ends the tracking of changes without any changes to the settings.
  63          */
  64         void stop_tracking();
  65
  66         /**
  67          * Ends the tracking of changes, undoing the changes since the
  68          * change tracking began.
  69          */
  70         void undo_tracked_changes();
  71
  72 private:
  73         static multimap< QString, function<void(QVariant)> > callbacks_;
  74
  75         static bool tracking_;
  76         static map<QString, QVariant> tracked_changes_;
  77 };
  78
  79 } // namespace pv
  80
  81 #endif // PULSEVIEW_GLOBALSETTINGS_HPP