302 lines
8 KiB
C++
302 lines
8 KiB
C++
// Copyright (c) 2011-2017 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <qt/bitcoinamountfield.h>
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#include <qt/bitcoinunits.h>
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#include <qt/guiconstants.h>
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#include <qt/qvaluecombobox.h>
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#include <QApplication>
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#include <QAbstractSpinBox>
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#include <QHBoxLayout>
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#include <QKeyEvent>
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#include <QLineEdit>
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/** QSpinBox that uses fixed-point numbers internally and uses our own
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* formatting/parsing functions.
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*/
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class AmountSpinBox: public QAbstractSpinBox
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{
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Q_OBJECT
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public:
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explicit AmountSpinBox(QWidget *parent):
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QAbstractSpinBox(parent),
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currentUnit(BitcoinUnits::BTC),
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singleStep(100000) // satoshis
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{
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setAlignment(Qt::AlignRight);
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connect(lineEdit(), SIGNAL(textEdited(QString)), this, SIGNAL(valueChanged()));
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}
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QValidator::State validate(QString &text, int &pos) const
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{
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if(text.isEmpty())
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return QValidator::Intermediate;
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bool valid = false;
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parse(text, &valid);
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/* Make sure we return Intermediate so that fixup() is called on defocus */
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return valid ? QValidator::Intermediate : QValidator::Invalid;
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}
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void fixup(QString &input) const
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{
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bool valid = false;
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CAmount val = parse(input, &valid);
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if(valid)
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{
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input = BitcoinUnits::format(currentUnit, val, false, BitcoinUnits::separatorAlways);
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lineEdit()->setText(input);
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}
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}
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CAmount value(bool *valid_out=0) const
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{
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return parse(text(), valid_out);
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}
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void setValue(const CAmount& value)
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{
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lineEdit()->setText(BitcoinUnits::format(currentUnit, value, false, BitcoinUnits::separatorAlways));
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Q_EMIT valueChanged();
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}
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void stepBy(int steps)
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{
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bool valid = false;
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CAmount val = value(&valid);
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val = val + steps * singleStep;
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val = qMin(qMax(val, CAmount(0)), BitcoinUnits::maxMoney());
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setValue(val);
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}
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void setDisplayUnit(int unit)
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{
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bool valid = false;
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CAmount val = value(&valid);
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currentUnit = unit;
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if(valid)
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setValue(val);
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else
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clear();
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}
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void setSingleStep(const CAmount& step)
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{
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singleStep = step;
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}
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QSize minimumSizeHint() const
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{
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if(cachedMinimumSizeHint.isEmpty())
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{
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ensurePolished();
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const QFontMetrics fm(fontMetrics());
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int h = lineEdit()->minimumSizeHint().height();
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int w = fm.width(BitcoinUnits::format(BitcoinUnits::BTC, BitcoinUnits::maxMoney(), false, BitcoinUnits::separatorAlways));
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w += 2; // cursor blinking space
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QStyleOptionSpinBox opt;
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initStyleOption(&opt);
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QSize hint(w, h);
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QSize extra(35, 6);
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opt.rect.setSize(hint + extra);
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extra += hint - style()->subControlRect(QStyle::CC_SpinBox, &opt,
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QStyle::SC_SpinBoxEditField, this).size();
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// get closer to final result by repeating the calculation
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opt.rect.setSize(hint + extra);
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extra += hint - style()->subControlRect(QStyle::CC_SpinBox, &opt,
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QStyle::SC_SpinBoxEditField, this).size();
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hint += extra;
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hint.setHeight(h);
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opt.rect = rect();
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cachedMinimumSizeHint = style()->sizeFromContents(QStyle::CT_SpinBox, &opt, hint, this)
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.expandedTo(QApplication::globalStrut());
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}
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return cachedMinimumSizeHint;
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}
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private:
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int currentUnit;
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CAmount singleStep;
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mutable QSize cachedMinimumSizeHint;
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/**
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* Parse a string into a number of base monetary units and
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* return validity.
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* @note Must return 0 if !valid.
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*/
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CAmount parse(const QString &text, bool *valid_out=0) const
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{
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CAmount val = 0;
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bool valid = BitcoinUnits::parse(currentUnit, text, &val);
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if(valid)
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{
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if(val < 0 || val > BitcoinUnits::maxMoney())
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valid = false;
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}
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if(valid_out)
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*valid_out = valid;
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return valid ? val : 0;
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}
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protected:
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bool event(QEvent *event)
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{
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if (event->type() == QEvent::KeyPress || event->type() == QEvent::KeyRelease)
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{
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QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
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if (keyEvent->key() == Qt::Key_Comma)
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{
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// Translate a comma into a period
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QKeyEvent periodKeyEvent(event->type(), Qt::Key_Period, keyEvent->modifiers(), ".", keyEvent->isAutoRepeat(), keyEvent->count());
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return QAbstractSpinBox::event(&periodKeyEvent);
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}
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}
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return QAbstractSpinBox::event(event);
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}
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StepEnabled stepEnabled() const
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{
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if (isReadOnly()) // Disable steps when AmountSpinBox is read-only
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return StepNone;
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if (text().isEmpty()) // Allow step-up with empty field
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return StepUpEnabled;
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StepEnabled rv = 0;
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bool valid = false;
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CAmount val = value(&valid);
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if(valid)
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{
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if(val > 0)
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rv |= StepDownEnabled;
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if(val < BitcoinUnits::maxMoney())
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rv |= StepUpEnabled;
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}
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return rv;
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}
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Q_SIGNALS:
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void valueChanged();
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};
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#include <qt/bitcoinamountfield.moc>
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BitcoinAmountField::BitcoinAmountField(QWidget *parent) :
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QWidget(parent),
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amount(0)
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{
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amount = new AmountSpinBox(this);
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amount->setLocale(QLocale::c());
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amount->installEventFilter(this);
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amount->setMaximumWidth(170);
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QHBoxLayout *layout = new QHBoxLayout(this);
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layout->addWidget(amount);
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unit = new QValueComboBox(this);
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unit->setModel(new BitcoinUnits(this));
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layout->addWidget(unit);
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layout->addStretch(1);
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layout->setContentsMargins(0,0,0,0);
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setLayout(layout);
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setFocusPolicy(Qt::TabFocus);
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setFocusProxy(amount);
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// If one if the widgets changes, the combined content changes as well
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connect(amount, SIGNAL(valueChanged()), this, SIGNAL(valueChanged()));
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connect(unit, SIGNAL(currentIndexChanged(int)), this, SLOT(unitChanged(int)));
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// Set default based on configuration
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unitChanged(unit->currentIndex());
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}
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void BitcoinAmountField::clear()
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{
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amount->clear();
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unit->setCurrentIndex(0);
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}
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void BitcoinAmountField::setEnabled(bool fEnabled)
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{
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amount->setEnabled(fEnabled);
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unit->setEnabled(fEnabled);
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}
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bool BitcoinAmountField::validate()
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{
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bool valid = false;
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value(&valid);
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setValid(valid);
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return valid;
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}
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void BitcoinAmountField::setValid(bool valid)
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{
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if (valid)
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amount->setStyleSheet("");
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else
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amount->setStyleSheet(STYLE_INVALID);
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}
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bool BitcoinAmountField::eventFilter(QObject *object, QEvent *event)
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{
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if (event->type() == QEvent::FocusIn)
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{
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// Clear invalid flag on focus
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setValid(true);
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}
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return QWidget::eventFilter(object, event);
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}
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QWidget *BitcoinAmountField::setupTabChain(QWidget *prev)
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{
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QWidget::setTabOrder(prev, amount);
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QWidget::setTabOrder(amount, unit);
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return unit;
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}
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CAmount BitcoinAmountField::value(bool *valid_out) const
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{
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return amount->value(valid_out);
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}
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void BitcoinAmountField::setValue(const CAmount& value)
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{
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amount->setValue(value);
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}
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void BitcoinAmountField::setReadOnly(bool fReadOnly)
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{
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amount->setReadOnly(fReadOnly);
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}
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void BitcoinAmountField::unitChanged(int idx)
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{
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// Use description tooltip for current unit for the combobox
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unit->setToolTip(unit->itemData(idx, Qt::ToolTipRole).toString());
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// Determine new unit ID
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int newUnit = unit->itemData(idx, BitcoinUnits::UnitRole).toInt();
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amount->setDisplayUnit(newUnit);
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}
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void BitcoinAmountField::setDisplayUnit(int newUnit)
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{
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unit->setValue(newUnit);
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}
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void BitcoinAmountField::setSingleStep(const CAmount& step)
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{
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amount->setSingleStep(step);
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}
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