#75 Indicate if an address has been previously used

src/mainwindow.cpp

@@ -1054,7 +1054,6 @@ void MainWindow::setupRecieveTab() {
         } 
     });
 
-
     // zAddr toggle button, one for sprout and one for sapling
     QObject::connect(ui->rdioZAddr,  &QRadioButton::toggled, addZAddrsToComboList(false));
     QObject::connect(ui->rdioZSAddr, &QRadioButton::toggled, addZAddrsToComboList(true));
@@ -1116,6 +1115,7 @@ void MainWindow::setupRecieveTab() {
             ui->rcvBal->clear();
             ui->txtRecieve->clear();
             ui->qrcodeDisplay->clear();
+            ui->lblUsed->clear();
             return;
         }
 
@@ -1126,11 +1126,17 @@ void MainWindow::setupRecieveTab() {
         else {
             ui->rcvUpdateLabel->setText("Update Label");
         }
-
+        
         ui->rcvLabel->setText(label);
         ui->rcvBal->setText(Settings::getZECUSDDisplayFormat(rpc->getAllBalances()->value(addr)));
         ui->txtRecieve->setPlainText(addr);       
         ui->qrcodeDisplay->setAddress(addr);
+        if (rpc->getUsedAddresses()->value(addr, false)) {
+            ui->lblUsed->setText(tr("Address has been previously used"));
+        } else {
+            ui->lblUsed->setText(tr("Address is unused"));
+        }
+        
     });    
 
     // Recieve tab add/update label

src/mainwindow.ui

@@ -22,7 +22,7 @@
     <item row="0" column="0">
      <widget class="QTabWidget" name="tabWidget">
       <property name="currentIndex">
-       <number>1</number>
+       <number>2</number>
       </property>
       <widget class="QWidget" name="tab">
        <attribute name="title">
@@ -749,7 +749,7 @@
                   </property>
                  </widget>
                 </item>
-                <item row="3" column="1" colspan="2">
+                <item row="4" column="1" colspan="2">
                  <layout class="QHBoxLayout" name="horizontalLayout_16">
                   <item>
                    <widget class="QPushButton" name="exportKey">
@@ -773,6 +773,20 @@
                   </item>
                  </layout>
                 </item>
+                <item row="3" column="0">
+                 <widget class="QLabel" name="label_15">
+                  <property name="text">
+                   <string>Address used</string>
+                  </property>
+                 </widget>
+                </item>
+                <item row="3" column="1" colspan="2">
+                 <widget class="QLabel" name="lblUsed">
+                  <property name="text">
+                   <string>TextLabel</string>
+                  </property>
+                 </widget>
+                </item>
                </layout>
               </item>
               <item>

src/rpc.cpp

@@ -48,6 +48,8 @@ RPC::RPC(MainWindow* main) {
     });
     // Start at every 10s. When an operation is pending, this will change to every second
     txTimer->start(Settings::updateSpeed);  
+
+    usedAddresses = new QMap<QString, bool>();
 }
 
 RPC::~RPC() {
@@ -60,6 +62,7 @@ RPC::~RPC() {
 
     delete utxos;
     delete allBalances;
+    delete usedAddresses;
     delete zaddresses;
 
     delete conn;
@@ -410,6 +413,9 @@ void RPC::refreshReceivedZTrans(QList<QString> zaddrs) {
             for (auto it = zaddrTxids->constBegin(); it != zaddrTxids->constEnd(); it++) {
                 auto zaddr = it.key();
                 for (auto& i : it.value().get<json::array_t>()) {   
+                    // Mark the address as used
+                    usedAddresses->insert(zaddr, true);
+
                     // Filter out change txs
                     if (! i["change"].get<json::boolean_t>()) {
                         auto txid = QString::fromStdString(i["txid"].get<json::string_t>());
@@ -424,7 +430,7 @@ void RPC::refreshReceivedZTrans(QList<QString> zaddrs) {
                                 memos[zaddr + txid] = memo;
                         }
                     }
-                }        
+                }                        
             }
 
             // 2. For all txids, go and get the details of that txid.
@@ -732,16 +738,20 @@ void RPC::refreshTransactions() {
                 fee = it["fee"].get<json::number_float_t>();
             }
 
+            QString address = (it["address"].is_null() ? "" : QString::fromStdString(it["address"]));
+
             TransactionItem tx{
                 QString::fromStdString(it["category"]),
                 (qint64)it["time"].get<json::number_unsigned_t>(),
-                (it["address"].is_null() ? "" : QString::fromStdString(it["address"])),
+                address,
                 QString::fromStdString(it["txid"]),
                 it["amount"].get<json::number_float_t>() + fee,
                 (unsigned long)it["confirmations"].get<json::number_unsigned_t>(),
                 "", "" };
 
             txdata.push_back(tx);
+            if (!address.isEmpty())
+                usedAddresses->insert(address, true);
         }
 
         // Update model data, which updates the table view

src/rpc.h

@@ -50,6 +50,7 @@ public:
     const QList<QString>*             getAllZAddresses()     { return zaddresses; }
     const QList<UnspentOutput>*       getUTXOs()             { return utxos; }
     const QMap<QString, double>*      getAllBalances()       { return allBalances; }
+    const QMap<QString, bool>*        getUsedAddresses()     { return usedAddresses; }
 
     void newZaddr(bool sapling, const std::function<void(json)>& cb);
     void newTaddr(const std::function<void(json)>& cb);
@@ -93,6 +94,7 @@ private:
 
     QList<UnspentOutput>*       utxos                       = nullptr;
     QMap<QString, double>*      allBalances                 = nullptr;
+    QMap<QString, bool>*        usedAddresses               = nullptr;
     QList<QString>*             zaddresses                  = nullptr;
     
     QMap<QString, Tx>           watchingOps;

src/sendtab.cpp

@@ -379,8 +379,6 @@ void MainWindow::maxAmountChecked(int checked) {
             sumAllAmounts += Settings::getMinerFee();
         }
 
-        
-
         auto addr = ui->inputsCombo->currentText();
 
         auto maxamount  = rpc->getAllBalances()->value(addr) - sumAllAmounts;