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 <QApplication>
  23 #include <QByteArray>
  24 #include <QFontMetrics>
  25 #include <QString>
  26
  27 using std::function;
  28 using std::map;
  29 using std::multimap;
  30
  31 namespace pv {
  32
  33 const QString GlobalSettings::Key_View_ZoomToFitDuringAcq = "View_ZoomToFitDuringAcq";
  34 const QString GlobalSettings::Key_View_ZoomToFitAfterAcq = "View_ZoomToFitAfterAcq";
  35 const QString GlobalSettings::Key_View_ColouredBG = "View_ColouredBG";
  36 const QString GlobalSettings::Key_View_StickyScrolling = "View_StickyScrolling";
  37 const QString GlobalSettings::Key_View_ShowSamplingPoints = "View_ShowSamplingPoints";
  38 const QString GlobalSettings::Key_View_ShowAnalogMinorGrid = "View_ShowAnalogMinorGrid";
  39 const QString GlobalSettings::Key_View_DefaultDivHeight = "View_DefaultDivHeight";
  40 const QString GlobalSettings::Key_Dec_InitialStateConfigurable = "Dec_InitialStateConfigurable";
  41
  42 multimap< QString, function<void(QVariant)> > GlobalSettings::callbacks_;
  43 bool GlobalSettings::tracking_ = false;
  44 map<QString, QVariant> GlobalSettings::tracked_changes_;
  45
  46 GlobalSettings::GlobalSettings() :
  47         QSettings()
  48 {
  49         beginGroup("Settings");
  50 }
  51
  52 void GlobalSettings::set_defaults_where_needed()
  53 {
  54         // Enable zoom-to-fit after acquisition by default
  55         if (!contains(Key_View_ZoomToFitAfterAcq))
  56                 setValue(Key_View_ZoomToFitAfterAcq, true);
  57
  58         // Enable coloured trace backgrounds by default
  59         if (!contains(Key_View_ColouredBG))
  60                 setValue(Key_View_ColouredBG, true);
  61
  62         // Enable showing sampling points by default
  63         if (!contains(Key_View_ShowSamplingPoints))
  64                 setValue(Key_View_ShowSamplingPoints, true);
  65
  66         if (!contains(Key_View_DefaultDivHeight))
  67                 setValue(Key_View_DefaultDivHeight,
  68                 3 * QFontMetrics(QApplication::font()).height());
  69 }
  70
  71 void GlobalSettings::register_change_handler(const QString key,
  72         function<void(QVariant)> cb)
  73 {
  74         callbacks_.emplace(key, cb);
  75 }
  76
  77 void GlobalSettings::setValue(const QString &key, const QVariant &value)
  78 {
  79         // Save previous value if we're tracking changes,
  80         // not altering an already-existing saved setting
  81         if (tracking_)
  82                 tracked_changes_.emplace(key, QSettings::value(key));
  83
  84         QSettings::setValue(key, value);
  85
  86         // Call all registered callbacks for this key
  87         auto range = callbacks_.equal_range(key);
  88
  89         for (auto it = range.first; it != range.second; it++)
  90                 it->second(value);
  91 }
  92
  93 void GlobalSettings::start_tracking()
  94 {
  95         tracking_ = true;
  96         tracked_changes_.clear();
  97 }
  98
  99 void GlobalSettings::stop_tracking()
 100 {
 101         tracking_ = false;
 102         tracked_changes_.clear();
 103 }
 104
 105 void GlobalSettings::undo_tracked_changes()
 106 {
 107         tracking_ = false;
 108
 109         for (auto entry : tracked_changes_)
 110                 setValue(entry.first, entry.second);
 111
 112         tracked_changes_.clear();
 113 }
 114
 115 void GlobalSettings::store_gvariant(QSettings &settings, GVariant *v)
 116 {
 117         const GVariantType *var_type = g_variant_get_type(v);
 118         char *var_type_str = g_variant_type_dup_string(var_type);
 119
 120         QByteArray var_data = QByteArray((const char*)g_variant_get_data(v),
 121                 g_variant_get_size(v));
 122
 123         settings.setValue("value", var_data);
 124         settings.setValue("type", var_type_str);
 125
 126         g_free(var_type_str);
 127 }
 128
 129 GVariant* GlobalSettings::restore_gvariant(QSettings &settings)
 130 {
 131         QString raw_type = settings.value("type").toString();
 132         GVariantType *var_type = g_variant_type_new(raw_type.toUtf8());
 133
 134         QByteArray data = settings.value("value").toByteArray();
 135
 136         gpointer var_data = g_memdup((gconstpointer)data.constData(),
 137                 (guint)data.size());
 138
 139         GVariant *value = g_variant_new_from_data(var_type, var_data,
 140                 data.size(), false, g_free, var_data);
 141
 142         g_variant_type_free(var_type);
 143
 144         return value;
 145 }
 146
 147
 148 } // namespace pv