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