qt: Add BitcoinUnits::formatWithPrivacy() function

Author: hebasto

src/qt/bitcoinunits.cpp

@@ -6,6 +6,8 @@
 
 #include <QStringList>
 
+#include <cassert>
+
 BitcoinUnits::BitcoinUnits(QObject *parent):
         QAbstractListModel(parent),
         unitlist(availableUnits())
@@ -94,7 +96,7 @@ int BitcoinUnits::decimals(int unit)
     }
 }
 
-QString BitcoinUnits::format(int unit, const CAmount& nIn, bool fPlus, SeparatorStyle separators)
+QString BitcoinUnits::format(int unit, const CAmount& nIn, bool fPlus, SeparatorStyle separators, bool justify)
 {
     // Note: not using straight sprintf here because we do NOT want
     // localized number formatting.
@@ -106,6 +108,7 @@ QString BitcoinUnits::format(int unit, const CAmount& nIn, bool fPlus, Separator
     qint64 n_abs = (n > 0 ? n : -n);
     qint64 quotient = n_abs / coin;
     QString quotient_str = QString::number(quotient);
+    if (justify) quotient_str = quotient_str.rightJustified(16 - num_decimals, ' ');
 
     // Use SI-style thin space separators as these are locale independent and can't be
     // confused with the decimal marker.
@@ -150,6 +153,17 @@ QString BitcoinUnits::formatHtmlWithUnit(int unit, const CAmount& amount, bool p
     return QString("<span style='white-space: nowrap;'>%1</span>").arg(str);
 }
 
+QString BitcoinUnits::formatWithPrivacy(int unit, const CAmount& amount, SeparatorStyle separators, bool privacy)
+{
+    assert(amount >= 0);
+    QString value;
+    if (privacy) {
+        value = format(unit, 0, false, separators, true).replace('0', '#');
+    } else {
+        value = format(unit, amount, false, separators, true);
+    }
+    return value + QString(" ") + shortName(unit);
+}
 
 bool BitcoinUnits::parse(int unit, const QString &value, CAmount *val_out)
 {

src/qt/bitcoinunits.h

@@ -72,11 +72,13 @@ class BitcoinUnits: public QAbstractListModel
     //! Number of decimals left
     static int decimals(int unit);
     //! Format as string
-    static QString format(int unit, const CAmount& amount, bool plussign=false, SeparatorStyle separators=separatorStandard);
+    static QString format(int unit, const CAmount& amount, bool plussign = false, SeparatorStyle separators = separatorStandard, bool justify = false);
     //! Format as string (with unit)
     static QString formatWithUnit(int unit, const CAmount& amount, bool plussign=false, SeparatorStyle separators=separatorStandard);
     //! Format as HTML string (with unit)
     static QString formatHtmlWithUnit(int unit, const CAmount& amount, bool plussign=false, SeparatorStyle separators=separatorStandard);
+    //! Format as string (with unit) of fixed length to preserve privacy, if it is set.
+    static QString formatWithPrivacy(int unit, const CAmount& amount, SeparatorStyle separators, bool privacy);
     //! Parse string to coin amount
     static bool parse(int unit, const QString &value, CAmount *val_out);
     //! Gets title for amount column including current display unit if optionsModel reference available */