pv/globalsettings.cpp

   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 #include "globalsettings.hpp"
  21
  22 #include <QByteArray>
  23 #include <QString>
  24
  25 using std::function;
  26 using std::map;
  27 using std::multimap;
  28
  29 namespace pv {
  30
  31 const QString GlobalSettings::Key_View_ZoomToFitDuringAcq = "View_ZoomToFitDuringAcq";
  32 const QString GlobalSettings::Key_View_ZoomToFitAfterAcq = "View_ZoomToFitAfterAcq";
  33 const QString GlobalSettings::Key_View_ColouredBG = "View_ColouredBG";
  34 const QString GlobalSettings::Key_View_StickyScrolling = "View_StickyScrolling";
  35 const QString GlobalSettings::Key_View_ShowSamplingPoints = "View_ShowSamplingPoints";
  36 const QString GlobalSettings::Key_View_ShowAnalogMinorGrid = "View_ShowAnalogMinorGrid";
  37 const QString GlobalSettings::Key_Dec_InitialStateConfigurable = "Dec_InitialStateConfigurable";
  38
  39 multimap< QString, function<void(QVariant)> > GlobalSettings::callbacks_;
  40 bool GlobalSettings::tracking_ = false;
  41 map<QString, QVariant> GlobalSettings::tracked_changes_;
  42
  43 GlobalSettings::GlobalSettings() :
  44         QSettings()
  45 {
  46         beginGroup("Settings");
  47 }
  48
  49 void GlobalSettings::set_defaults_where_needed()
  50 {
  51         // Enable zoom-to-fit after acquisition by default
  52         if (!contains(Key_View_ZoomToFitAfterAcq))
  53                 setValue(Key_View_ZoomToFitAfterAcq, true);
  54
  55         // Enable coloured trace backgrounds by default
  56         if (!contains(Key_View_ColouredBG))
  57                 setValue(Key_View_ColouredBG, true);
  58
  59         // Enable showing sampling points by default
  60         if (!contains(Key_View_ShowSamplingPoints))
  61                 setValue(Key_View_ShowSamplingPoints, true);
  62 }
  63
  64 void GlobalSettings::register_change_handler(const QString key,
  65         function<void(QVariant)> cb)
  66 {
  67         callbacks_.emplace(key, cb);
  68 }
  69
  70 void GlobalSettings::setValue(const QString &key, const QVariant &value)
  71 {
  72         // Save previous value if we're tracking changes,
  73         // not altering an already-existing saved setting
  74         if (tracking_)
  75                 tracked_changes_.emplace(key, QSettings::value(key));
  76
  77         QSettings::setValue(key, value);
  78
  79         // Call all registered callbacks for this key
  80         auto range = callbacks_.equal_range(key);
  81
  82         for (auto it = range.first; it != range.second; it++)
  83                 it->second(value);
  84 }
  85
  86 void GlobalSettings::start_tracking()
  87 {
  88         tracking_ = true;
  89         tracked_changes_.clear();
  90 }
  91
  92 void GlobalSettings::stop_tracking()
  93 {
  94         tracking_ = false;
  95         tracked_changes_.clear();
  96 }
  97
  98 void GlobalSettings::undo_tracked_changes()
  99 {
 100         tracking_ = false;
 101
 102         for (auto entry : tracked_changes_)
 103                 setValue(entry.first, entry.second);
 104
 105         tracked_changes_.clear();
 106 }
 107
 108 void GlobalSettings::store_gvariant(QSettings &settings, GVariant *v)
 109 {
 110         const GVariantType *var_type = g_variant_get_type(v);
 111         char *var_type_str = g_variant_type_dup_string(var_type);
 112
 113         QByteArray var_data = QByteArray((const char*)g_variant_get_data(v),
 114                 g_variant_get_size(v));
 115
 116         settings.setValue("value", var_data);
 117         settings.setValue("type", var_type_str);
 118
 119         g_free(var_type_str);
 120 }
 121
 122 GVariant* GlobalSettings::restore_gvariant(QSettings &settings)
 123 {
 124         QString raw_type = settings.value("type").toString();
 125         GVariantType *var_type = g_variant_type_new(raw_type.toUtf8());
 126
 127         QByteArray data = settings.value("value").toByteArray();
 128
 129         gpointer var_data = g_memdup((gconstpointer)data.constData(),
 130                 (guint)data.size());
 131
 132         GVariant *value = g_variant_new_from_data(var_type, var_data,
 133                 data.size(), false, g_free, var_data);
 134
 135         g_variant_type_free(var_type);
 136
 137         return value;
 138 }
 139
 140
 141 } // namespace pv