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_View_DefaultLogicHeight = "View_DefaultLogicHeight";
  41 const QString GlobalSettings::Key_Dec_InitialStateConfigurable = "Dec_InitialStateConfigurable";
  42
  43 multimap< QString, function<void(QVariant)> > GlobalSettings::callbacks_;
  44 bool GlobalSettings::tracking_ = false;
  45 map<QString, QVariant> GlobalSettings::tracked_changes_;
  46
  47 GlobalSettings::GlobalSettings() :
  48         QSettings()
  49 {
  50         beginGroup("Settings");
  51 }
  52
  53 void GlobalSettings::set_defaults_where_needed()
  54 {
  55         // Enable zoom-to-fit after acquisition by default
  56         if (!contains(Key_View_ZoomToFitAfterAcq))
  57                 setValue(Key_View_ZoomToFitAfterAcq, true);
  58
  59         // Enable coloured trace backgrounds by default
  60         if (!contains(Key_View_ColouredBG))
  61                 setValue(Key_View_ColouredBG, true);
  62
  63         // Enable showing sampling points by default
  64         if (!contains(Key_View_ShowSamplingPoints))
  65                 setValue(Key_View_ShowSamplingPoints, true);
  66
  67         if (!contains(Key_View_DefaultDivHeight))
  68                 setValue(Key_View_DefaultDivHeight,
  69                 3 * QFontMetrics(QApplication::font()).height());
  70
  71         if (!contains(Key_View_DefaultLogicHeight))
  72                 setValue(Key_View_DefaultLogicHeight,
  73                 2 * QFontMetrics(QApplication::font()).height());
  74 }
  75
  76 void GlobalSettings::register_change_handler(const QString key,
  77         function<void(QVariant)> cb)
  78 {
  79         callbacks_.emplace(key, cb);
  80 }
  81
  82 void GlobalSettings::setValue(const QString &key, const QVariant &value)
  83 {
  84         // Save previous value if we're tracking changes,
  85         // not altering an already-existing saved setting
  86         if (tracking_)
  87                 tracked_changes_.emplace(key, QSettings::value(key));
  88
  89         QSettings::setValue(key, value);
  90
  91         // Call all registered callbacks for this key
  92         auto range = callbacks_.equal_range(key);
  93
  94         for (auto it = range.first; it != range.second; it++)
  95                 it->second(value);
  96 }
  97
  98 void GlobalSettings::start_tracking()
  99 {
 100         tracking_ = true;
 101         tracked_changes_.clear();
 102 }
 103
 104 void GlobalSettings::stop_tracking()
 105 {
 106         tracking_ = false;
 107         tracked_changes_.clear();
 108 }
 109
 110 void GlobalSettings::undo_tracked_changes()
 111 {
 112         tracking_ = false;
 113
 114         for (auto entry : tracked_changes_)
 115                 setValue(entry.first, entry.second);
 116
 117         tracked_changes_.clear();
 118 }
 119
 120 void GlobalSettings::store_gvariant(QSettings &settings, GVariant *v)
 121 {
 122         const GVariantType *var_type = g_variant_get_type(v);
 123         char *var_type_str = g_variant_type_dup_string(var_type);
 124
 125         QByteArray var_data = QByteArray((const char*)g_variant_get_data(v),
 126                 g_variant_get_size(v));
 127
 128         settings.setValue("value", var_data);
 129         settings.setValue("type", var_type_str);
 130
 131         g_free(var_type_str);
 132 }
 133
 134 GVariant* GlobalSettings::restore_gvariant(QSettings &settings)
 135 {
 136         QString raw_type = settings.value("type").toString();
 137         GVariantType *var_type = g_variant_type_new(raw_type.toUtf8());
 138
 139         QByteArray data = settings.value("value").toByteArray();
 140
 141         gpointer var_data = g_memdup((gconstpointer)data.constData(),
 142                 (guint)data.size());
 143
 144         GVariant *value = g_variant_new_from_data(var_type, var_data,
 145                 data.size(), false, g_free, var_data);
 146
 147         g_variant_type_free(var_type);
 148
 149         return value;
 150 }
 151
 152
 153 } // namespace pv