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// Copyright (c) 2011-2013 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "bitcoinunits.h"
#include <QStringList>
BitcoinUnits::BitcoinUnits(QObject *parent):
QAbstractListModel(parent),
unitlist(availableUnits())
{
}
QList<BitcoinUnits::Unit> BitcoinUnits::availableUnits()
{
QList<BitcoinUnits::Unit> unitlist;
unitlist.append(BTC);
unitlist.append(mBTC);
unitlist.append(uBTC);
return unitlist;
}
bool BitcoinUnits::valid(int unit)
{
switch(unit)
{
case BTC:
case mBTC:
case uBTC:
return true;
default:
return false;
}
}
QString BitcoinUnits::name(int unit)
{
switch(unit)
{
case BTC: return QString("BTC");
case mBTC: return QString("mBTC");
case uBTC: return QString::fromUtf8("μBTC");
default: return QString("???");
}
}
QString BitcoinUnits::description(int unit)
{
switch(unit)
{
case BTC: return QString("Bitcoins");
case mBTC: return QString("Milli-Bitcoins (1 / 1,000)");
case uBTC: return QString("Micro-Bitcoins (1 / 1,000,000)");
default: return QString("???");
}
}
qint64 BitcoinUnits::factor(int unit)
{
switch(unit)
{
case BTC: return 100000000;
case mBTC: return 100000;
case uBTC: return 100;
default: return 100000000;
}
}
qint64 BitcoinUnits::maxAmount(int unit)
{
switch(unit)
{
case BTC: return Q_INT64_C(21000000);
case mBTC: return Q_INT64_C(21000000000);
case uBTC: return Q_INT64_C(21000000000000);
default: return 0;
}
}
int BitcoinUnits::amountDigits(int unit)
{
switch(unit)
{
case BTC: return 8; // 21,000,000 (# digits, without commas)
case mBTC: return 11; // 21,000,000,000
case uBTC: return 14; // 21,000,000,000,000
default: return 0;
}
}
int BitcoinUnits::decimals(int unit)
{
switch(unit)
{
case BTC: return 8;
case mBTC: return 5;
case uBTC: return 2;
default: return 0;
}
}
QString BitcoinUnits::format(int unit, qint64 n, bool fPlus)
{
// Note: not using straight sprintf here because we do NOT want
// localized number formatting.
if(!valid(unit))
return QString(); // Refuse to format invalid unit
qint64 coin = factor(unit);
int num_decimals = decimals(unit);
qint64 n_abs = (n > 0 ? n : -n);
qint64 quotient = n_abs / coin;
qint64 remainder = n_abs % coin;
QString quotient_str = QString::number(quotient);
QString remainder_str = QString::number(remainder).rightJustified(num_decimals, '0');
// Right-trim excess zeros after the decimal point
int nTrim = 0;
for (int i = remainder_str.size()-1; i>=2 && (remainder_str.at(i) == '0'); --i)
++nTrim;
remainder_str.chop(nTrim);
if (n < 0)
quotient_str.insert(0, '-');
else if (fPlus && n > 0)
quotient_str.insert(0, '+');
return quotient_str + QString(".") + remainder_str;
}
QString BitcoinUnits::formatWithUnit(int unit, qint64 amount, bool plussign)
{
return format(unit, amount, plussign) + QString(" ") + name(unit);
}
bool BitcoinUnits::parse(int unit, const QString &value, qint64 *val_out)
{
if(!valid(unit) || value.isEmpty())
return false; // Refuse to parse invalid unit or empty string
int num_decimals = decimals(unit);
QStringList parts = value.split(".");
if(parts.size() > 2)
{
return false; // More than one dot
}
QString whole = parts[0];
QString decimals;
if(parts.size() > 1)
{
decimals = parts[1];
}
if(decimals.size() > num_decimals)
{
return false; // Exceeds max precision
}
bool ok = false;
QString str = whole + decimals.leftJustified(num_decimals, '0');
if(str.size() > 18)
{
return false; // Longer numbers will exceed 63 bits
}
qint64 retvalue = str.toLongLong(&ok);
if(val_out)
{
*val_out = retvalue;
}
return ok;
}
int BitcoinUnits::rowCount(const QModelIndex &parent) const
{
Q_UNUSED(parent);
return unitlist.size();
}
QVariant BitcoinUnits::data(const QModelIndex &index, int role) const
{
int row = index.row();
if(row >= 0 && row < unitlist.size())
{
Unit unit = unitlist.at(row);
switch(role)
{
case Qt::EditRole:
case Qt::DisplayRole:
return QVariant(name(unit));
case Qt::ToolTipRole:
return QVariant(description(unit));
case UnitRole:
return QVariant(static_cast<int>(unit));
}
}
return QVariant();
}