allow multiple units in bitcoin amount widget (for example, for sending) using a combobox

src/qt/bitcoinamountfield.cpp

@@ -7,9 +7,10 @@
 #include <QRegExpValidator>
 #include <QHBoxLayout>
 #include <QKeyEvent>
+#include <QComboBox>
 
 BitcoinAmountField::BitcoinAmountField(QWidget *parent):
-        QWidget(parent), amount(0), decimals(0)
+        QWidget(parent), amount(0), decimals(0), currentUnit(-1)
 {
     amount = new QValidatedLineEdit(this);
     amount->setValidator(new QRegExpValidator(QRegExp("[0-9]*"), this));
@@ -18,7 +19,6 @@ BitcoinAmountField::BitcoinAmountField(QWidget *parent):
     amount->setMaximumWidth(100);
     decimals = new QValidatedLineEdit(this);
     decimals->setValidator(new QRegExpValidator(QRegExp("[0-9]+"), this));
-    decimals->setMaxLength(8);
     decimals->setAlignment(Qt::AlignLeft|Qt::AlignVCenter);
     decimals->setMaximumWidth(75);
 
@@ -27,7 +27,9 @@ BitcoinAmountField::BitcoinAmountField(QWidget *parent):
     layout->addWidget(amount);
     layout->addWidget(new QLabel(QString(".")));
     layout->addWidget(decimals);
-    layout->addWidget(new QLabel(QString(" ") + BitcoinUnits::name(BitcoinUnits::BTC)));
+    unit = new QComboBox(this);
+    unit->setModel(new BitcoinUnits(this));
+    layout->addWidget(unit);
     layout->addStretch(1);
     layout->setContentsMargins(0,0,0,0);
 
@@ -39,6 +41,10 @@ BitcoinAmountField::BitcoinAmountField(QWidget *parent):
     // 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)));
+
+    // TODO: set default based on configuration
+    unitChanged(unit->currentIndex());
 }
 
 void BitcoinAmountField::setText(const QString &text)
@@ -72,17 +78,22 @@ bool BitcoinAmountField::validate()
     }
     if(!BitcoinUnits::parse(BitcoinUnits::BTC, text(), 0))
     {
-        amount->setValid(false);
-        decimals->setValid(false);
+        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())
+    if(decimals->text().isEmpty() && amount->text().isEmpty())
     {
         return QString();
     }
@@ -111,3 +122,51 @@ QWidget *BitcoinAmountField::setupTabChain(QWidget *prev)
     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)
+    {
+        setValue(currentValue);
+    }
+    else
+    {
+        // If current value is invalid, just clear field
+        setText("");
+    }
+    setValid(true);
+
+
+}

src/qt/bitcoinamountfield.h

@@ -5,6 +5,7 @@
 
 QT_BEGIN_NAMESPACE
 class QValidatedLineEdit;
+class QComboBox;
 QT_END_NAMESPACE
 
 // Coin amount entry widget with separate parts for whole
@@ -12,15 +13,21 @@ QT_END_NAMESPACE
 class BitcoinAmountField: public QWidget
 {
     Q_OBJECT
-    Q_PROPERTY(QString text READ text WRITE setText NOTIFY textChanged USER true);
+    //Q_PROPERTY(QString text READ text WRITE setText NOTIFY textChanged USER true);
+    Q_PROPERTY(qint64 value READ value WRITE setValue NOTIFY textChanged USER true);
 public:
     explicit BitcoinAmountField(QWidget *parent = 0);
 
-    void setText(const QString &text);
-    QString text() const;
+    qint64 value(bool *valid=0) const;
+    void setValue(qint64 value);
 
-    void clear();
+    // Mark current valid as invalid in UI
+    void setValid(bool valid);
     bool validate();
+
+    // Make field empty and ready for new input
+    void clear();
+
     // Qt messes up the tab chain by default in some cases (issue http://bugreports.qt.nokia.com/browse/QTBUG-10907)
     // Hence we have to set it up manually
     QWidget *setupTabChain(QWidget *prev);
@@ -35,6 +42,15 @@ protected:
 private:
     QValidatedLineEdit *amount;
     QValidatedLineEdit *decimals;
+    QComboBox *unit;
+    int currentUnit;
+
+    void setText(const QString &text);
+    QString text() const;
+
+private slots:
+    void unitChanged(int idx);
+
 };
 
 

src/qt/bitcoinunits.cpp

@@ -2,7 +2,22 @@
 
 #include <QStringList>
 
-QString BitcoinUnits::name(BitcoinUnits::Unit unit)
+BitcoinUnits::BitcoinUnits(QObject *parent):
+        QAbstractListModel(parent),
+        unitlist(availableUnits())
+{
+}
+
+QList<BitcoinUnits::Unit> BitcoinUnits::availableUnits()
+{
+    QList<BitcoinUnits::Unit> unitlist;
+    unitlist.append(BTC);
+    unitlist.append(mBTC);
+    unitlist.append(uBTC);
+    return unitlist;
+}
+
+QString BitcoinUnits::name(int unit)
 {
     switch(unit)
     {
@@ -13,18 +28,18 @@ QString BitcoinUnits::name(BitcoinUnits::Unit unit)
     }
 }
 
-QString BitcoinUnits::description(BitcoinUnits::Unit unit)
+QString BitcoinUnits::description(int unit)
 {
     switch(unit)
     {
-    case BTC: return QString("Bitcoin");
-    case mBTC: return QString("Milli-bitcoin (1/1000)");
-    case uBTC: return QString("Micro-bitcoin (1/1000,000)");
+    case BTC: return QString("Bitcoins");
+    case mBTC: return QString("Milli-Bitcoins (1 / 1,000)");
+    case uBTC: return QString("Micro-Bitcoins (1 / 1,000,000)");
     default: return QString("???");
     }
 }
 
-qint64 BitcoinUnits::factor(BitcoinUnits::Unit unit)
+qint64 BitcoinUnits::factor(int unit)
 {
     switch(unit)
     {
@@ -35,7 +50,18 @@ qint64 BitcoinUnits::factor(BitcoinUnits::Unit unit)
     }
 }
 
-int BitcoinUnits::decimals(BitcoinUnits::Unit unit)
+int BitcoinUnits::amountDigits(int unit)
+{
+    switch(unit)
+    {
+    case BTC: return 8; // 21,000,000
+    case mBTC: return 11; // 21,000,000,000
+    case uBTC: return 14; // 21,000,000,000,000
+    default: return 0;
+    }
+}
+
+int BitcoinUnits::decimals(int unit)
 {
     switch(unit)
     {
@@ -46,7 +72,7 @@ int BitcoinUnits::decimals(BitcoinUnits::Unit unit)
     }
 }
 
-QString BitcoinUnits::format(BitcoinUnits::Unit unit, qint64 n, bool fPlus)
+QString BitcoinUnits::format(int unit, qint64 n, bool fPlus)
 {
     // Note: not using straight sprintf here because we do NOT want
     // localized number formatting.
@@ -71,12 +97,12 @@ QString BitcoinUnits::format(BitcoinUnits::Unit unit, qint64 n, bool fPlus)
     return quotient_str + QString(".") + remainder_str;
 }
 
-QString BitcoinUnits::formatWithUnit(BitcoinUnits::Unit unit, qint64 amount, bool plussign)
+QString BitcoinUnits::formatWithUnit(int unit, qint64 amount, bool plussign)
 {
     return format(unit, amount, plussign) + QString(" ") + name(unit);
 }
 
-bool BitcoinUnits::parse(BitcoinUnits::Unit unit, const QString &value, qint64 *val_out)
+bool BitcoinUnits::parse(int unit, const QString &value, qint64 *val_out)
 {
     int num_decimals = decimals(unit);
     QStringList parts = value.split(".");
@@ -94,3 +120,29 @@ bool BitcoinUnits::parse(BitcoinUnits::Unit unit, const QString &value, qint64 *
     }
     return ok;
 }
+
+int BitcoinUnits::rowCount(const QModelIndex &parent) const
+{
+    Q_UNUSED(parent);
+    return unitlist.size();
+}
+
+QVariant BitcoinUnits::data(const QModelIndex &index, int role) const
+{
+    int row = index.row();
+    if(row >= 0 && row < unitlist.size())
+    {
+        Unit unit = unitlist.at(row);
+        switch(role)
+        {
+        case Qt::EditRole:
+        case Qt::DisplayRole:
+            return QVariant(name(unit));
+        case Qt::ToolTipRole:
+            return QVariant(description(unit));
+        case UnitRole:
+            return QVariant(static_cast<int>(unit));
+        }
+    }
+    return QVariant();
+}

src/qt/bitcoinunits.h

@@ -2,33 +2,53 @@
 #define BITCOINUNITS_H
 
 #include <QString>
+#include <QAbstractListModel>
 
 // Bitcoin unit definitions
-class BitcoinUnits
+class BitcoinUnits: public QAbstractListModel
 {
 public:
+    explicit BitcoinUnits(QObject *parent);
+
     enum Unit
     {
+        // Source: https://en.bitcoin.it/wiki/Units
+        // Please add only sensible ones
         BTC,
         mBTC,
         uBTC
     };
 
+    /// Static API
+    // Get list of units, for dropdown box
+    static QList<Unit> availableUnits();
     // Short name
-    static QString name(Unit unit);
+    static QString name(int unit);
     // Longer description
-    static QString description(Unit unit);
+    static QString description(int unit);
     // Number of satoshis / unit
-    static qint64 factor(Unit unit);
+    static qint64 factor(int unit);
+    // Number of amount digits (to represent max number of coins)
+    static int amountDigits(int unit);
     // Number of decimals left
-    static int decimals(Unit unit);
+    static int decimals(int unit);
     // Format as string
-    static QString format(Unit unit, qint64 amount, bool plussign=false);
+    static QString format(int unit, qint64 amount, bool plussign=false);
     // Format as string (with unit)
-    static QString formatWithUnit(Unit unit, qint64 amount, bool plussign=false);
+    static QString formatWithUnit(int unit, qint64 amount, bool plussign=false);
     // Parse string to coin amount
-    static bool parse(Unit unit, const QString &value, qint64 *val_out);
+    static bool parse(int unit, const QString &value, qint64 *val_out);
 
+    /// AbstractListModel implementation
+    enum {
+        // Unit identifier
+        UnitRole = Qt::UserRole
+    } RoleIndex;
+    int rowCount(const QModelIndex &parent) const;
+    QVariant data(const QModelIndex &index, int role) const;
+private:
+    QList<BitcoinUnits::Unit> unitlist;
 };
+typedef BitcoinUnits::Unit BitcoinUnit;
 
 #endif // BITCOINUNITS_H

src/qt/optionsdialog.cpp

@@ -103,7 +103,6 @@ OptionsDialog::OptionsDialog(QWidget *parent):
     connect(mapper, SIGNAL(currentIndexChanged(int)), this, SLOT(disableApply()));
 
     /* Event bindings */
-    qDebug() << "setup";
     connect(contents_widget, SIGNAL(currentRowChanged(int)), this, SLOT(changePage(int)));
     connect(buttonbox->button(QDialogButtonBox::Ok), SIGNAL(clicked()), this, SLOT(okClicked()));
     connect(buttonbox->button(QDialogButtonBox::Cancel), SIGNAL(clicked()), this, SLOT(cancelClicked()));

src/qt/optionsmodel.cpp

@@ -36,7 +36,7 @@ QVariant OptionsModel::data(const QModelIndex & index, int role) const
         case ProxyPort:
             return QVariant(QString::fromStdString(addrProxy.ToStringPort()));
         case Fee:
-            return QVariant(QString::fromStdString(FormatMoney(nTransactionFee)));
+            return QVariant(nTransactionFee);
         default:
             return QVariant();
         }
@@ -104,17 +104,9 @@ bool OptionsModel::setData(const QModelIndex & index, const QVariant & value, in
             }
             break;
         case Fee: {
-                int64 retval;
-                if(ParseMoney(value.toString().toStdString(), retval))
-                {
-                    nTransactionFee = retval;
+            nTransactionFee = value.toLongLong();
             walletdb.WriteSetting("nTransactionFee", nTransactionFee);
             }
-                else
-                {
-                    successful = false; // Parse error
-                }
-            }
             break;
         default:
             break;

src/qt/optionsmodel.h

@@ -18,14 +18,14 @@ public:
     explicit OptionsModel(CWallet *wallet, QObject *parent = 0);
 
     enum OptionID {
-        StartAtStartup,
-        MinimizeToTray,
-        MapPortUPnP,
-        MinimizeOnClose,
-        ConnectSOCKS4,
-        ProxyIP,
-        ProxyPort,
-        Fee,
+        StartAtStartup, // bool
+        MinimizeToTray, // bool
+        MapPortUPnP, // bool
+        MinimizeOnClose, // bool
+        ConnectSOCKS4, // bool
+        ProxyIP, // QString
+        ProxyPort, // QString
+        Fee, // qint64
         OptionIDRowCount
     };
 

src/qt/sendcoinsentry.cpp

@@ -87,6 +87,16 @@ bool SendCoinsEntry::validate()
     {
         retval = false;
     }
+    else
+    {
+        if(ui->payAmount->value() <= 0)
+        {
+            // Cannot send 0 coins or less
+            ui->payAmount->setValid(false);
+            retval = false;
+        }
+    }
+
 
     if(!ui->payTo->hasAcceptableInput() ||
        (model && !model->validateAddress(ui->payTo->text())))
@@ -104,7 +114,7 @@ SendCoinsRecipient SendCoinsEntry::getValue()
 
     rv.address = ui->payTo->text();
     rv.label = ui->addAsLabel->text();
-    BitcoinUnits::parse(BitcoinUnits::BTC, ui->payAmount->text(), &rv.amount);
+    rv.amount = ui->payAmount->value();
 
     return rv;
 }