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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 "bitcoinamountfield.h"
#include "bitcoinunits.h"
#include "guiconstants.h"
#include "qvaluecombobox.h"
#include <QApplication>
#include <QDoubleSpinBox>
#include <QHBoxLayout>
#include <QKeyEvent>
#include <qmath.h> // for qPow()
BitcoinAmountField::BitcoinAmountField(QWidget *parent) :
QWidget(parent),
amount(0),
currentUnit(-1)
{
nSingleStep = 100000; // satoshis
amount = new QDoubleSpinBox(this);
amount->setLocale(QLocale::c());
amount->installEventFilter(this);
amount->setMaximumWidth(170);
QHBoxLayout *layout = new QHBoxLayout(this);
layout->addWidget(amount);
unit = new QValueComboBox(this);
unit->setModel(new BitcoinUnits(this));
layout->addWidget(unit);
layout->addStretch(1);
layout->setContentsMargins(0,0,0,0);
setLayout(layout);
setFocusPolicy(Qt::TabFocus);
setFocusProxy(amount);
// If one if the widgets changes, the combined content changes as well
connect(amount, SIGNAL(valueChanged(QString)), this, SIGNAL(textChanged()));
connect(unit, SIGNAL(currentIndexChanged(int)), this, SLOT(unitChanged(int)));
// Set default based on configuration
unitChanged(unit->currentIndex());
}
void BitcoinAmountField::setText(const QString &text)
{
if (text.isEmpty())
amount->clear();
else
amount->setValue(text.toDouble());
}
void BitcoinAmountField::clear()
{
amount->clear();
unit->setCurrentIndex(0);
}
bool BitcoinAmountField::validate()
{
bool valid = true;
if (amount->value() == 0.0)
valid = false;
else if (!BitcoinUnits::parse(currentUnit, text(), 0))
valid = false;
else if (amount->value() > BitcoinUnits::maxAmount(currentUnit))
valid = false;
setValid(valid);
return valid;
}
void BitcoinAmountField::setValid(bool valid)
{
if (valid)
amount->setStyleSheet("");
else
amount->setStyleSheet(STYLE_INVALID);
}
QString BitcoinAmountField::text() const
{
if (amount->text().isEmpty())
return QString();
else
return amount->text();
}
bool BitcoinAmountField::eventFilter(QObject *object, QEvent *event)
{
if (event->type() == QEvent::FocusIn)
{
// Clear invalid flag on focus
setValid(true);
}
else if (event->type() == QEvent::KeyPress || event->type() == QEvent::KeyRelease)
{
QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
if (keyEvent->key() == Qt::Key_Comma)
{
// Translate a comma into a period
QKeyEvent periodKeyEvent(event->type(), Qt::Key_Period, keyEvent->modifiers(), ".", keyEvent->isAutoRepeat(), keyEvent->count());
QApplication::sendEvent(object, &periodKeyEvent);
return true;
}
}
return QWidget::eventFilter(object, event);
}
QWidget *BitcoinAmountField::setupTabChain(QWidget *prev)
{
QWidget::setTabOrder(prev, amount);
QWidget::setTabOrder(amount, unit);
return unit;
}
qint64 BitcoinAmountField::value(bool *valid_out) const
{
qint64 val_out = 0;
bool valid = BitcoinUnits::parse(currentUnit, text(), &val_out);
if (valid_out)
{
*valid_out = valid;
}
return val_out;
}
void BitcoinAmountField::setValue(qint64 value)
{
setText(BitcoinUnits::format(currentUnit, value));
}
void BitcoinAmountField::setReadOnly(bool fReadOnly)
{
amount->setReadOnly(fReadOnly);
unit->setEnabled(!fReadOnly);
}
void BitcoinAmountField::unitChanged(int idx)
{
// Use description tooltip for current unit for the combobox
unit->setToolTip(unit->itemData(idx, Qt::ToolTipRole).toString());
// Determine new unit ID
int newUnit = unit->itemData(idx, BitcoinUnits::UnitRole).toInt();
// Parse current value and convert to new unit
bool valid = false;
qint64 currentValue = value(&valid);
currentUnit = newUnit;
// Set max length after retrieving the value, to prevent truncation
amount->setDecimals(BitcoinUnits::decimals(currentUnit));
amount->setMaximum(qPow(10, BitcoinUnits::amountDigits(currentUnit)) - qPow(10, -amount->decimals()));
amount->setSingleStep((double)nSingleStep / (double)BitcoinUnits::factor(currentUnit));
if (valid)
{
// If value was valid, re-place it in the widget with the new unit
setValue(currentValue);
}
else
{
// If current value is invalid, just clear field
setText("");
}
setValid(true);
}
void BitcoinAmountField::setDisplayUnit(int newUnit)
{
unit->setValue(newUnit);
}
void BitcoinAmountField::setSingleStep(qint64 step)
{
nSingleStep = step;
unitChanged(unit->currentIndex());
}