1 files changed, 178 insertions, 0 deletions
diff --git a/src/qt/bitcoinamountfield.cpp b/src/qt/bitcoinamountfield.cpp
new file mode 100644
index 0000000000..f1edc62bbe
--- /dev/null
+++ b/src/qt/bitcoinamountfield.cpp
@@ -0,0 +1,178 @@
+#include "bitcoinamountfield.h"
+#include "qvalidatedlineedit.h"
+#include "qvaluecombobox.h"
+#include "bitcoinunits.h"
+
+#include <QLabel>
+#include <QLineEdit>
+#include <QRegExpValidator>
+#include <QHBoxLayout>
+#include <QKeyEvent>
+#include <QComboBox>
+
+BitcoinAmountField::BitcoinAmountField(QWidget *parent):
+        QWidget(parent), amount(0), decimals(0), currentUnit(-1)
+{
+    amount = new QValidatedLineEdit(this);
+    amount->setValidator(new QRegExpValidator(QRegExp("[0-9]*"), this));
+    amount->setAlignment(Qt::AlignRight|Qt::AlignVCenter);
+    amount->installEventFilter(this);
+    amount->setMaximumWidth(75);
+    decimals = new QValidatedLineEdit(this);
+    decimals->setValidator(new QRegExpValidator(QRegExp("[0-9]+"), this));
+    decimals->setAlignment(Qt::AlignLeft|Qt::AlignVCenter);
+    decimals->setMaximumWidth(75);
+
+    QHBoxLayout *layout = new QHBoxLayout(this);
+    layout->setSpacing(0);
+    layout->addWidget(amount);
+    layout->addWidget(new QLabel(QString("<b>.</b>")));
+    layout->addWidget(decimals);
+    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(textChanged(QString)), this, SIGNAL(textChanged()));
+    connect(decimals, SIGNAL(textChanged(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)
+{
+    const QStringList parts = text.split(QString("."));
+    if(parts.size() == 2)
+    {
+        amount->setText(parts[0]);
+        decimals->setText(parts[1]);
+    }
+    else
+    {
+        amount->setText(QString());
+        decimals->setText(QString());
+    }
+}
+
+void BitcoinAmountField::clear()
+{
+    amount->clear();
+    decimals->clear();
+    unit->setCurrentIndex(0);
+}
+
+bool BitcoinAmountField::validate()
+{
+    bool valid = true;
+    if(decimals->text().isEmpty())
+    {
+        decimals->setValid(false);
+        valid = false;
+    }
+    if(!BitcoinUnits::parse(currentUnit, text(), 0))
+    {
+        setValid(false);
+        valid = false;
+    }
+
+    return valid;
+}
+
+void BitcoinAmountField::setValid(bool valid)
+{
+    amount->setValid(valid);
+    decimals->setValid(valid);
+}
+
+QString BitcoinAmountField::text() const
+{
+    if(decimals->text().isEmpty() && amount->text().isEmpty())
+    {
+        return QString();
+    }
+    return amount->text() + QString(".") + decimals->text();
+}
+
+// Intercept '.' and ',' keys, if pressed focus a specified widget
+bool BitcoinAmountField::eventFilter(QObject *object, QEvent *event)
+{
+    Q_UNUSED(object);
+    if(event->type() == QEvent::KeyPress)
+    {
+        QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
+        if(keyEvent->key() == Qt::Key_Period || keyEvent->key() == Qt::Key_Comma)
+        {
+            decimals->setFocus();
+            decimals->selectAll();
+        }
+    }
+    return false;
+}
+
+QWidget *BitcoinAmountField::setupTabChain(QWidget *prev)
+{
+    QWidget::setTabOrder(prev, amount);
+    QWidget::setTabOrder(amount, decimals);
+    return decimals;
+}
+
+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->setMaxLength(BitcoinUnits::amountDigits(currentUnit));
+    decimals->setMaxLength(BitcoinUnits::decimals(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);
+}