#74, #42 - Show a warning if there are no peers/internet is off

src/confirm.ui

@@ -146,6 +146,19 @@
      </property>
     </spacer>
    </item>
+   <item>
+    <widget class="QLabel" name="nopeersWarning">
+     <property name="styleSheet">
+      <string notr="true">color: red;</string>
+     </property>
+     <property name="text">
+      <string>zcashd doesn't seem to have any peers. You might not be connected to the internet, so this Transaction might not work.</string>
+     </property>
+     <property name="wordWrap">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
    <item>
     <widget class="QLabel" name="syncingWarning">
      <property name="styleSheet">

src/rpc.cpp

@@ -531,10 +531,17 @@ void RPC::getInfoThenRefresh(bool force) {
             refreshTransactions();
         }
 
+        int connections = reply["connections"].get<json::number_integer_t>();
+        Settings::getInstance()->setPeers(connections);
+
+        if (connections == 0) {
+            // If there are no peers connected, then the internet is probably off or something else is wrong. 
+            QIcon i = QApplication::style()->standardIcon(QStyle::SP_MessageBoxWarning);
+            main->statusIcon->setPixmap(i.pixmap(16, 16));
+        }
+
         // Get network sol/s
         if (ezcashd) {
-            int conns = reply["connections"].get<json::number_integer_t>();
-
             json payload = {
                 {"jsonrpc", "1.0"},
                 {"id", "someid"},
@@ -544,7 +551,7 @@ void RPC::getInfoThenRefresh(bool force) {
             conn->doRPCIgnoreError(payload, [=](const json& reply) {
                 qint64 solrate = reply.get<json::number_unsigned_t>();
 
-                ui->numconnections->setText(QString::number(conns));
+                ui->numconnections->setText(QString::number(connections));
                 ui->solrate->setText(QString::number(solrate) % " Sol/s");
             });
         } 
@@ -596,7 +603,14 @@ void RPC::getInfoThenRefresh(bool force) {
             main->statusLabel->setText(statusText);   
 
             auto zecPrice = Settings::getUSDFormat(1);
-            QString tooltip = QObject::tr("Connected to zcashd");
+            QString tooltip;
+            if (connections > 0) {
+                tooltip = QObject::tr("Connected to zcashd");
+            }
+            else {
+                tooltip = QObject::tr("zcashd has no peer connections");
+            }
+
             if (!zecPrice.isEmpty()) {
                 tooltip = "1 ZEC = " % zecPrice % "\n" % tooltip;
             }

src/sendtab.cpp

@@ -581,6 +581,9 @@ bool MainWindow::confirmTx(Tx tx) {
     // Syncing warning
     confirm.syncingWarning->setVisible(Settings::getInstance()->isSyncing());
 
+    // No peers warning
+    confirm.nopeersWarning->setVisible(Settings::getInstance()->getPeers() == 0);
+
     // And FromAddress in the confirm dialog 
     confirm.sendFrom->setText(fnSplitAddressForWrap(tx.fromAddr));
     QString tooltip = tr("Current balance      : ") +

src/settings.cpp

@@ -134,7 +134,13 @@ void Settings::setSaveZtxs(bool save) {
     QSettings().setValue("options/savesenttx", save);
 }
 
+void Settings::setPeers(int peers) {
+    _peerConnections = peers;
+}
 
+int Settings::getPeers() {
+    return _peerConnections;
+}
 //=================================
 // Static Stuff
 //=================================

src/settings.h

@@ -53,6 +53,9 @@ public:
 
     void    setZECPrice(double p) { zecPrice = p; }
     double  getZECPrice();
+
+    void    setPeers(int peers);
+    int     getPeers();
        
     // Static stuff
     static const QString txidStatusMessage;
@@ -98,7 +101,7 @@ private:
     bool    _isSyncing        = false;
     int     _blockNumber      = 0;
     bool    _useEmbedded      = false;
-
+    int     _peerConnections  = 0;
     double zecPrice = 0.0;
 };