Provide correct sorting to numeric columns in the wallet UI

src/qt/guiutil.cpp

@@ -910,4 +910,28 @@ QString formatPingTime(double dPingTime)
     return dPingTime == 0 ? QObject::tr("N/A") : QString(QObject::tr("%1 ms")).arg(QString::number((int)(dPingTime * 1000), 10));
 }
 
+/**
+ * Class constructor.
+ * @param[int64_t] numValue   The Number to convert to a QString for display
+ */
+QTableWidgetNumberItem::QTableWidgetNumberItem(const int64_t numValue) : QTableWidgetItem(), value(numValue)
+{
+    this->setText(QString::number(numValue));
+}
+
+/**
+ * Comparator overload to ensure that the QStrings internally set as numbers are compared as numbers and not strings.
+ * @param[QTableWidgetItem] item      Right hand side of the less than operator
+ */
+bool QTableWidgetNumberItem::operator<(QTableWidgetItem const& item) const
+{
+    QTableWidgetNumberItem const* rhs = dynamic_cast<QTableWidgetNumberItem const*>(&item);
+
+    if (!rhs) {
+        return QTableWidgetItem::operator<(item);
+    }
+
+    return value < rhs->value;
+}
+
 } // namespace GUIUtil

src/qt/guiutil.h

@@ -14,6 +14,7 @@
 #include <QProgressBar>
 #include <QString>
 #include <QTableView>
+#include <QTableWidget>
 
 #include <boost/filesystem.hpp>
 
@@ -172,6 +173,21 @@ namespace GUIUtil
             void on_geometriesChanged();
     };
 
+    /*
+     * An extension to the QTableWidgetItem that provides the ability to compare numeric values
+     * in a table widget, reverting back to the default parent comparison when the items are not 
+     * both numeric.
+     */
+    class QTableWidgetNumberItem : public QTableWidgetItem
+    {
+        public:
+              QTableWidgetNumberItem(const int64_t numValue);
+              virtual bool operator<(QTableWidgetItem const& item) const;
+
+          private:
+              int64_t value;
+    };
+
     bool GetStartOnSystemStartup();
     bool SetStartOnSystemStartup(bool fAutoStart);
 

src/qt/masternodelist.cpp

@@ -554,16 +554,16 @@ void MasternodeList::updateVoteList(bool reset)
                 urlItem->setOpenExternalLinks(true);
                 urlItem->setStyleSheet("background-color: transparent;");
                 QTableWidgetItem *hashItem = new QTableWidgetItem(QString::fromStdString(pbudgetProposal->GetHash().ToString()));
-                QTableWidgetItem *blockStartItem = new QTableWidgetItem(QString::number((int64_t)pbudgetProposal->GetBlockStart()));
-                QTableWidgetItem *blockEndItem = new QTableWidgetItem(QString::number((int64_t)pbudgetProposal->GetBlockEnd()));
-                QTableWidgetItem *paymentsItem = new QTableWidgetItem(QString::number((int64_t)pbudgetProposal->GetTotalPaymentCount()));
-                QTableWidgetItem *remainingPaymentsItem = new QTableWidgetItem(QString::number((int64_t)pbudgetProposal->GetRemainingPaymentCount()));
-                QTableWidgetItem *yesVotesItem = new QTableWidgetItem(QString::number((int64_t)pbudgetProposal->GetYeas()));
-                QTableWidgetItem *noVotesItem = new QTableWidgetItem(QString::number((int64_t)pbudgetProposal->GetNays()));
-                QTableWidgetItem *abstainVotesItem = new QTableWidgetItem(QString::number((int64_t)pbudgetProposal->GetAbstains()));
+                GUIUtil::QTableWidgetNumberItem *blockStartItem = new GUIUtil::QTableWidgetNumberItem((int64_t)pbudgetProposal->GetBlockStart());
+                GUIUtil::QTableWidgetNumberItem *blockEndItem = new GUIUtil::QTableWidgetNumberItem((int64_t)pbudgetProposal->GetBlockEnd());
+                GUIUtil::QTableWidgetNumberItem *paymentsItem = new GUIUtil::QTableWidgetNumberItem((int64_t)pbudgetProposal->GetTotalPaymentCount());
+                GUIUtil::QTableWidgetNumberItem *remainingPaymentsItem = new GUIUtil::QTableWidgetNumberItem((int64_t)pbudgetProposal->GetRemainingPaymentCount());
+                GUIUtil::QTableWidgetNumberItem *yesVotesItem = new GUIUtil::QTableWidgetNumberItem((int64_t)pbudgetProposal->GetYeas());
+                GUIUtil::QTableWidgetNumberItem *noVotesItem = new GUIUtil::QTableWidgetNumberItem((int64_t)pbudgetProposal->GetNays());
+                GUIUtil::QTableWidgetNumberItem *abstainVotesItem = new GUIUtil::QTableWidgetNumberItem((int64_t)pbudgetProposal->GetAbstains());
                 QTableWidgetItem *AddressItem = new QTableWidgetItem(QString::fromStdString(address2.ToString()));
-                QTableWidgetItem *totalPaymentItem = new QTableWidgetItem(QString::number((pbudgetProposal->GetAmount()*pbudgetProposal->GetTotalPaymentCount())/100000000 ));
-                QTableWidgetItem *monthlyPaymentItem = new QTableWidgetItem(QString::number(pbudgetProposal->GetAmount()/100000000));
+                GUIUtil::QTableWidgetNumberItem *totalPaymentItem = new GUIUtil::QTableWidgetNumberItem((pbudgetProposal->GetAmount()*pbudgetProposal->GetTotalPaymentCount())/100000000);
+                GUIUtil::QTableWidgetNumberItem *monthlyPaymentItem = new GUIUtil::QTableWidgetNumberItem(pbudgetProposal->GetAmount()/100000000);
 
                 ui->tableWidgetVoting->insertRow(0);
                 ui->tableWidgetVoting->setItem(0, 0, nameItem);