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// Copyright (c) 2011-2015 The Bitcoin Core developers
// Distributed under the MIT 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 <QAbstractSpinBox>
#include <QHBoxLayout>
#include <QKeyEvent>
#include <QLineEdit>
/** QSpinBox that uses fixed-point numbers internally and uses our own
* formatting/parsing functions.
*/
class AmountSpinBox: public QAbstractSpinBox
{
Q_OBJECT
public:
explicit AmountSpinBox(QWidget *parent):
QAbstractSpinBox(parent),
currentUnit(BitcoinUnits::BTC),
singleStep(100000) // satoshis
{
setAlignment(Qt::AlignRight);
connect(lineEdit(), SIGNAL(textEdited(QString)), this, SIGNAL(valueChanged()));
}
QValidator::State validate(QString &text, int &pos) const
{
if(text.isEmpty())
return QValidator::Intermediate;
bool valid = false;
parse(text, &valid);
/* Make sure we return Intermediate so that fixup() is called on defocus */
return valid ? QValidator::Intermediate : QValidator::Invalid;
}
void fixup(QString &input) const
{
bool valid = false;
CAmount val = parse(input, &valid);
if(valid)
{
input = BitcoinUnits::format(currentUnit, val, false, BitcoinUnits::separatorAlways);
lineEdit()->setText(input);
}
}
CAmount value(bool *valid_out=0) const
{
return parse(text(), valid_out);
}
void setValue(const CAmount& value)
{
lineEdit()->setText(BitcoinUnits::format(currentUnit, value, false, BitcoinUnits::separatorAlways));
Q_EMIT valueChanged();
}
void stepBy(int steps)
{
bool valid = false;
CAmount val = value(&valid);
val = val + steps * singleStep;
val = qMin(qMax(val, CAmount(0)), BitcoinUnits::maxMoney());
setValue(val);
}
void setDisplayUnit(int unit)
{
bool valid = false;
CAmount val = value(&valid);
currentUnit = unit;
if(valid)
setValue(val);
else
clear();
}
void setSingleStep(const CAmount& step)
{
singleStep = step;
}
QSize minimumSizeHint() const
{
if(cachedMinimumSizeHint.isEmpty())
{
ensurePolished();
const QFontMetrics fm(fontMetrics());
int h = lineEdit()->minimumSizeHint().height();
int w = fm.width(BitcoinUnits::format(BitcoinUnits::BTC, BitcoinUnits::maxMoney(), false, BitcoinUnits::separatorAlways));
w += 2; // cursor blinking space
QStyleOptionSpinBox opt;
initStyleOption(&opt);
QSize hint(w, h);
QSize extra(35, 6);
opt.rect.setSize(hint + extra);
extra += hint - style()->subControlRect(QStyle::CC_SpinBox, &opt,
QStyle::SC_SpinBoxEditField, this).size();
// get closer to final result by repeating the calculation
opt.rect.setSize(hint + extra);
extra += hint - style()->subControlRect(QStyle::CC_SpinBox, &opt,
QStyle::SC_SpinBoxEditField, this).size();
hint += extra;
hint.setHeight(h);
opt.rect = rect();
cachedMinimumSizeHint = style()->sizeFromContents(QStyle::CT_SpinBox, &opt, hint, this)
.expandedTo(QApplication::globalStrut());
}
return cachedMinimumSizeHint;
}
private:
int currentUnit;
CAmount singleStep;
mutable QSize cachedMinimumSizeHint;
/**
* Parse a string into a number of base monetary units and
* return validity.
* @note Must return 0 if !valid.
*/
CAmount parse(const QString &text, bool *valid_out=0) const
{
CAmount val = 0;
bool valid = BitcoinUnits::parse(currentUnit, text, &val);
if(valid)
{
if(val < 0 || val > BitcoinUnits::maxMoney())
valid = false;
}
if(valid_out)
*valid_out = valid;
return valid ? val : 0;
}
protected:
bool event(QEvent *event)
{
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());
return QAbstractSpinBox::event(&periodKeyEvent);
}
}
return QAbstractSpinBox::event(event);
}
StepEnabled stepEnabled() const
{
if (isReadOnly()) // Disable steps when AmountSpinBox is read-only
return StepNone;
if (text().isEmpty()) // Allow step-up with empty field
return StepUpEnabled;
StepEnabled rv = 0;
bool valid = false;
CAmount val = value(&valid);
if(valid)
{
if(val > 0)
rv |= StepDownEnabled;
if(val < BitcoinUnits::maxMoney())
rv |= StepUpEnabled;
}
return rv;
}
Q_SIGNALS:
void valueChanged();
};
#include "bitcoinamountfield.moc"
BitcoinAmountField::BitcoinAmountField(QWidget *parent) :
QWidget(parent),
amount(0)
{
amount = new AmountSpinBox(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()), this, SIGNAL(valueChanged()));
connect(unit, SIGNAL(currentIndexChanged(int)), this, SLOT(unitChanged(int)));
// Set default based on configuration
unitChanged(unit->currentIndex());
}
void BitcoinAmountField::clear()
{
amount->clear();
unit->setCurrentIndex(0);
}
void BitcoinAmountField::setEnabled(bool fEnabled)
{
amount->setEnabled(fEnabled);
unit->setEnabled(fEnabled);
}
bool BitcoinAmountField::validate()
{
bool valid = false;
value(&valid);
setValid(valid);
return valid;
}
void BitcoinAmountField::setValid(bool valid)
{
if (valid)
amount->setStyleSheet("");
else
amount->setStyleSheet(STYLE_INVALID);
}
bool BitcoinAmountField::eventFilter(QObject *object, QEvent *event)
{
if (event->type() == QEvent::FocusIn)
{
// Clear invalid flag on focus
setValid(true);
}
return QWidget::eventFilter(object, event);
}
QWidget *BitcoinAmountField::setupTabChain(QWidget *prev)
{
QWidget::setTabOrder(prev, amount);
QWidget::setTabOrder(amount, unit);
return unit;
}
CAmount BitcoinAmountField::value(bool *valid_out) const
{
return amount->value(valid_out);
}
void BitcoinAmountField::setValue(const CAmount& value)
{
amount->setValue(value);
}
void BitcoinAmountField::setReadOnly(bool fReadOnly)
{
amount->setReadOnly(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();
amount->setDisplayUnit(newUnit);
}
void BitcoinAmountField::setDisplayUnit(int newUnit)
{
unit->setValue(newUnit);
}
void BitcoinAmountField::setSingleStep(const CAmount& step)
{
amount->setSingleStep(step);
}