Fix #832 by saving/restoring the decoder stack without settings
[pulseview.git] / 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 using std::function;
23 using std::map;
24 using std::multimap;
25
26 namespace pv {
27
28 const QString GlobalSettings::Key_View_ZoomToFitDuringAcq = "View_ZoomToFitDuringAcq";
29 const QString GlobalSettings::Key_View_ZoomToFitAfterAcq = "View_ZoomToFitAfterAcq";
30 const QString GlobalSettings::Key_View_ColouredBG = "View_ColouredBG";
31 const QString GlobalSettings::Key_View_StickyScrolling = "View_StickyScrolling";
32 const QString GlobalSettings::Key_View_ShowSamplingPoints = "View_ShowSamplingPoints";
33 const QString GlobalSettings::Key_View_ShowAnalogMinorGrid = "View_ShowAnalogMinorGrid";
34 const QString GlobalSettings::Key_Dec_InitialStateConfigurable = "Dec_InitialStateConfigurable";
35
36 multimap< QString, function<void(QVariant)> > GlobalSettings::callbacks_;
37 bool GlobalSettings::tracking_ = false;
38 map<QString, QVariant> GlobalSettings::tracked_changes_;
39
40 GlobalSettings::GlobalSettings() :
41         QSettings()
42 {
43         beginGroup("Settings");
44 }
45
46 void GlobalSettings::set_defaults_where_needed()
47 {
48         // Enable zoom-to-fit after acquisition by default
49         if (!contains(Key_View_ZoomToFitAfterAcq))
50                 setValue(Key_View_ZoomToFitAfterAcq, true);
51
52         // Enable coloured trace backgrounds by default
53         if (!contains(Key_View_ColouredBG))
54                 setValue(Key_View_ColouredBG, true);
55
56         // Enable showing sampling points by default
57         if (!contains(Key_View_ShowSamplingPoints))
58                 setValue(Key_View_ShowSamplingPoints, true);
59 }
60
61 void GlobalSettings::register_change_handler(const QString key,
62         function<void(QVariant)> cb)
63 {
64         callbacks_.emplace(key, cb);
65 }
66
67 void GlobalSettings::setValue(const QString &key, const QVariant &value)
68 {
69         // Save previous value if we're tracking changes,
70         // not altering an already-existing saved setting
71         if (tracking_)
72                 tracked_changes_.emplace(key, QSettings::value(key));
73
74         QSettings::setValue(key, value);
75
76         // Call all registered callbacks for this key
77         auto range = callbacks_.equal_range(key);
78
79         for (auto it = range.first; it != range.second; it++)
80                 it->second(value);
81 }
82
83 void GlobalSettings::start_tracking()
84 {
85         tracking_ = true;
86         tracked_changes_.clear();
87 }
88
89 void GlobalSettings::stop_tracking()
90 {
91         tracking_ = false;
92         tracked_changes_.clear();
93 }
94
95 void GlobalSettings::undo_tracked_changes()
96 {
97         tracking_ = false;
98
99         for (auto entry : tracked_changes_)
100                 setValue(entry.first, entry.second);
101
102         tracked_changes_.clear();
103 }
104
105 } // namespace pv