src/qt/bitcoinunits.cpp

   1 // Copyright (c) 2011-2016 The Bitcoin Core developers
   2 // Distributed under the MIT software license, see the accompanying
   3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   4
   5 #include "bitcoinunits.h"
   6
   7 #include "primitives/transaction.h"
   8
   9 #include <QStringList>
  10
  11 BitcoinUnits::BitcoinUnits(QObject *parent):
  12         QAbstractListModel(parent),
  13         unitlist(availableUnits())
  14 {
  15 }
  16
  17 QList<BitcoinUnits::Unit> BitcoinUnits::availableUnits()
  18 {
  19     QList<BitcoinUnits::Unit> unitlist;
  20     unitlist.append(BTC);
  21     unitlist.append(mBTC);
  22     unitlist.append(uBTC);
  23     return unitlist;
  24 }
  25
  26 bool BitcoinUnits::valid(int unit)
  27 {
  28     switch(unit)
  29     {
  30     case BTC:
  31     case mBTC:
  32     case uBTC:
  33         return true;
  34     default:
  35         return false;
  36     }
  37 }
  38
  39 QString BitcoinUnits::name(int unit)
  40 {
  41     switch(unit)
  42     {
  43     case BTC: return QString("BTC");
  44     case mBTC: return QString("mBTC");
  45     case uBTC: return QString::fromUtf8("μBTC");
  46     default: return QString("???");
  47     }
  48 }
  49
  50 QString BitcoinUnits::description(int unit)
  51 {
  52     switch(unit)
  53     {
  54     case BTC: return QString("Bitcoins");
  55     case mBTC: return QString("Milli-Bitcoins (1 / 1" THIN_SP_UTF8 "000)");
  56     case uBTC: return QString("Micro-Bitcoins (1 / 1" THIN_SP_UTF8 "000" THIN_SP_UTF8 "000)");
  57     default: return QString("???");
  58     }
  59 }
  60
  61 qint64 BitcoinUnits::factor(int unit)
  62 {
  63     switch(unit)
  64     {
  65     case BTC:  return 100000000;
  66     case mBTC: return 100000;
  67     case uBTC: return 100;
  68     default:   return 100000000;
  69     }
  70 }
  71
  72 int BitcoinUnits::decimals(int unit)
  73 {
  74     switch(unit)
  75     {
  76     case BTC: return 8;
  77     case mBTC: return 5;
  78     case uBTC: return 2;
  79     default: return 0;
  80     }
  81 }
  82
  83 QString BitcoinUnits::format(int unit, const CAmount& nIn, bool fPlus, SeparatorStyle separators)
  84 {
  85     // Note: not using straight sprintf here because we do NOT want
  86     // localized number formatting.
  87     if(!valid(unit))
  88         return QString(); // Refuse to format invalid unit
  89     qint64 n = (qint64)nIn;
  90     qint64 coin = factor(unit);
  91     int num_decimals = decimals(unit);
  92     qint64 n_abs = (n > 0 ? n : -n);
  93     qint64 quotient = n_abs / coin;
  94     qint64 remainder = n_abs % coin;
  95     QString quotient_str = QString::number(quotient);
  96     QString remainder_str = QString::number(remainder).rightJustified(num_decimals, '0');
  97
  98     // Use SI-style thin space separators as these are locale independent and can't be
  99     // confused with the decimal marker.
 100     QChar thin_sp(THIN_SP_CP);
 101     int q_size = quotient_str.size();
 102     if (separators == separatorAlways || (separators == separatorStandard && q_size > 4))
 103         for (int i = 3; i < q_size; i += 3)
 104             quotient_str.insert(q_size - i, thin_sp);
 105
 106     if (n < 0)
 107         quotient_str.insert(0, '-');
 108     else if (fPlus && n > 0)
 109         quotient_str.insert(0, '+');
 110     return quotient_str + QString(".") + remainder_str;
 111 }
 112
 113
 114 // NOTE: Using formatWithUnit in an HTML context risks wrapping
 115 // quantities at the thousands separator. More subtly, it also results
 116 // in a standard space rather than a thin space, due to a bug in Qt's
 117 // XML whitespace canonicalisation
 118 //
 119 // Please take care to use formatHtmlWithUnit instead, when
 120 // appropriate.
 121
 122 QString BitcoinUnits::formatWithUnit(int unit, const CAmount& amount, bool plussign, SeparatorStyle separators)
 123 {
 124     return format(unit, amount, plussign, separators) + QString(" ") + name(unit);
 125 }
 126
 127 QString BitcoinUnits::formatHtmlWithUnit(int unit, const CAmount& amount, bool plussign, SeparatorStyle separators)
 128 {
 129     QString str(formatWithUnit(unit, amount, plussign, separators));
 130     str.replace(QChar(THIN_SP_CP), QString(THIN_SP_HTML));
 131     return QString("<span style='white-space: nowrap;'>%1</span>").arg(str);
 132 }
 133
 134
 135 bool BitcoinUnits::parse(int unit, const QString &value, CAmount *val_out)
 136 {
 137     if(!valid(unit) || value.isEmpty())
 138         return false; // Refuse to parse invalid unit or empty string
 139     int num_decimals = decimals(unit);
 140
 141     // Ignore spaces and thin spaces when parsing
 142     QStringList parts = removeSpaces(value).split(".");
 143
 144     if(parts.size() > 2)
 145     {
 146         return false; // More than one dot
 147     }
 148     QString whole = parts[0];
 149     QString decimals;
 150
 151     if(parts.size() > 1)
 152     {
 153         decimals = parts[1];
 154     }
 155     if(decimals.size() > num_decimals)
 156     {
 157         return false; // Exceeds max precision
 158     }
 159     bool ok = false;
 160     QString str = whole + decimals.leftJustified(num_decimals, '0');
 161
 162     if(str.size() > 18)
 163     {
 164         return false; // Longer numbers will exceed 63 bits
 165     }
 166     CAmount retvalue(str.toLongLong(&ok));
 167     if(val_out)
 168     {
 169         *val_out = retvalue;
 170     }
 171     return ok;
 172 }
 173
 174 QString BitcoinUnits::getAmountColumnTitle(int unit)
 175 {
 176     QString amountTitle = QObject::tr("Amount");
 177     if (BitcoinUnits::valid(unit))
 178     {
 179         amountTitle += " ("+BitcoinUnits::name(unit) + ")";
 180     }
 181     return amountTitle;
 182 }
 183
 184 int BitcoinUnits::rowCount(const QModelIndex &parent) const
 185 {
 186     Q_UNUSED(parent);
 187     return unitlist.size();
 188 }
 189
 190 QVariant BitcoinUnits::data(const QModelIndex &index, int role) const
 191 {
 192     int row = index.row();
 193     if(row >= 0 && row < unitlist.size())
 194     {
 195         Unit unit = unitlist.at(row);
 196         switch(role)
 197         {
 198         case Qt::EditRole:
 199         case Qt::DisplayRole:
 200             return QVariant(name(unit));
 201         case Qt::ToolTipRole:
 202             return QVariant(description(unit));
 203         case UnitRole:
 204             return QVariant(static_cast<int>(unit));
 205         }
 206     }
 207     return QVariant();
 208 }
 209
 210 CAmount BitcoinUnits::maxMoney()
 211 {
 212     return MAX_MONEY;
 213 }