Rename create_context_menu() to create_header_context_menu()
[pulseview.git] / pv / prop / enum.cpp
1 /*
2  * This file is part of the PulseView project.
3  *
4  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
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 <cassert>
21 #include <cfloat>
22 #include <cmath>
23
24 #include <QComboBox>
25
26 #include "enum.hpp"
27
28 using std::abs;
29 using std::pair;
30 using std::vector;
31
32 namespace pv {
33 namespace prop {
34
35 Enum::Enum(QString name, QString desc,
36         vector<pair<Glib::VariantBase, QString> > values,
37         Getter getter, Setter setter) :
38         Property(name, desc, getter, setter),
39         values_(values),
40         selector_(nullptr)
41 {
42 }
43
44 QWidget* Enum::get_widget(QWidget *parent, bool auto_commit)
45 {
46         if (selector_)
47                 return selector_;
48
49         if (!getter_)
50                 return nullptr;
51
52         Glib::VariantBase variant = getter_();
53         if (!variant.gobj())
54                 return nullptr;
55
56         selector_ = new QComboBox(parent);
57         for (unsigned int i = 0; i < values_.size(); i++) {
58                 const pair<Glib::VariantBase, QString> &v = values_[i];
59                 selector_->addItem(v.second, qVariantFromValue(v.first));
60         }
61
62         update_widget();
63
64         if (auto_commit)
65                 connect(selector_, SIGNAL(currentIndexChanged(int)),
66                         this, SLOT(on_current_item_changed(int)));
67
68         return selector_;
69 }
70
71 void Enum::update_widget()
72 {
73         if (!selector_)
74                 return;
75
76         Glib::VariantBase variant = getter_();
77         assert(variant.gobj());
78
79         for (unsigned int i = 0; i < values_.size(); i++) {
80                 const pair<Glib::VariantBase, QString> &v = values_[i];
81
82                 // g_variant_equal() doesn't handle floating point properly
83                 if (v.first.is_of_type(Glib::VariantType("d"))) {
84                         gdouble a, b;
85                         g_variant_get(variant.gobj(), "d", &a);
86                         g_variant_get((GVariant*)(v.first.gobj()), "d", &b);
87                         if (abs(a - b) <= 2 * DBL_EPSILON)
88                                 selector_->setCurrentIndex(i);
89                 } else {
90                         // Check for "(dd)" type and handle it if it's found
91                         if (v.first.is_of_type(Glib::VariantType("(dd)"))) {
92                                 gdouble a1, a2, b1, b2;
93                                 g_variant_get(variant.gobj(), "(dd)", &a1, &a2);
94                                 g_variant_get((GVariant*)(v.first.gobj()), "(dd)", &b1, &b2);
95                                 if ((abs(a1 - b1) <= 2 * DBL_EPSILON) && \
96                                         (abs(a2 - b2) <= 2 * DBL_EPSILON))
97                                         selector_->setCurrentIndex(i);
98
99                         } else
100                                 // Handle all other types
101                                 if (v.first.equal(variant))
102                                         selector_->setCurrentIndex(i);
103                 }
104         }
105 }
106
107 void Enum::commit()
108 {
109         assert(setter_);
110
111         if (!selector_)
112                 return;
113
114         const int index = selector_->currentIndex();
115         if (index < 0)
116                 return;
117
118         setter_(selector_->itemData(index).value<Glib::VariantBase>());
119 }
120
121 void Enum::on_current_item_changed(int)
122 {
123         commit();
124 }
125
126 }  // namespace prop
127 }  // namespace pv