1 files changed, 167 insertions, 0 deletions
diff --git a/src/qt/bitcoinamountfield.cpp b/src/qt/bitcoinamountfield.cpp
new file mode 100644
index 0000000000..19cd5655cc
--- /dev/null
+++ b/src/qt/bitcoinamountfield.cpp
@@ -0,0 +1,167 @@
+#include "bitcoinamountfield.h"
+#include "qvaluecombobox.h"
+#include "bitcoinunits.h"
+
+#include "guiconstants.h"
+
+#include <QLabel>
+#include <QLineEdit>
+#include <QRegExpValidator>
+#include <QHBoxLayout>
+#include <QKeyEvent>
+#include <QDoubleSpinBox>
+#include <QComboBox>
+#include <QApplication>
+#include <qmath.h>
+
+BitcoinAmountField::BitcoinAmountField(QWidget *parent):
+        QWidget(parent), amount(0), currentUnit(-1)
+{
+    amount = new QDoubleSpinBox(this);
+    amount->setLocale(QLocale::c());
+    amount->setDecimals(8);
+    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;
+    if (valid && !BitcoinUnits::parse(currentUnit, text(), 0))
+        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());
+            qApp->sendEvent(object, &periodKeyEvent);
+            return true;
+        }
+    }
+    return QWidget::eventFilter(object, event);
+}
+
+QWidget *BitcoinAmountField::setupTabChain(QWidget *prev)
+{
+    QWidget::setTabOrder(prev, amount);
+    return amount;
+}
+
+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::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()));
+
+    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);
+}