qml: add lightning network status indicator in top bar, add channel peers to NetworkOverview

electrum/gui/qml/components/NetworkOverview.qml

@@ -173,6 +173,15 @@ Pane {
                     visible: !Config.useGossip
                 }
 
+                Label {
+                    visible: Daemon.currentWallet.isLightning
+                    text: qsTr('Channel peers:');
+                    color: Material.accentColor
+                }
+                Label {
+                    visible: Daemon.currentWallet.isLightning
+                    text: Daemon.currentWallet.lightningNumPeers
+                }
             }
 
         }

electrum/gui/qml/components/controls/LightningNetworkStatusIndicator.qml

@@ -0,0 +1,12 @@
+import QtQuick 2.6
+
+Image {
+    id: root
+
+    sourceSize.width: constants.iconSizeMedium
+    sourceSize.height: constants.iconSizeMedium
+
+    source: Daemon.currentWallet.lightningNumPeers
+                ? '../../../icons/lightning.png'
+                : '../../../icons/lightning_disconnected.png'
+}

electrum/gui/qml/components/main.qml

@@ -108,6 +108,10 @@ ApplicationWindow
                     scale: 1.5
                 }
 
+                LightningNetworkStatusIndicator {
+                    visible: Daemon.currentWallet.isLightning
+                }
+
                 OnchainNetworkStatusIndicator { }
 
                 Rectangle {

electrum/gui/qml/qewallet.py

@@ -71,6 +71,7 @@ class QEWallet(AuthMixin, QObject, QtEventListener):
     otpRequested = pyqtSignal()
     otpSuccess = pyqtSignal()
     otpFailed = pyqtSignal([str,str], arguments=['code','message'])
+    peersUpdated = pyqtSignal()
 
     _network_signal = pyqtSignal(str, object)
 
@@ -198,11 +199,13 @@ class QEWallet(AuthMixin, QObject, QtEventListener):
     def on_event_channel(self, wallet, channel):
         if wallet == self.wallet:
             self.balanceChanged.emit()
+            self.peersUpdated.emit()
 
     @event_listener
     def on_event_channels_updated(self, wallet):
         if wallet == self.wallet:
             self.balanceChanged.emit()
+            self.peersUpdated.emit()
 
     @qt_event_listener
     def on_event_payment_succeeded(self, wallet, key):
@@ -421,8 +424,6 @@ class QEWallet(AuthMixin, QObject, QtEventListener):
     def lightningBalance(self):
         if self.isLightning:
             self._lightningbalance.satsInt = int(self.wallet.lnworker.get_balance())
-        # else:
-        #     self._lightningbalance.satsInt = 0
         return self._lightningbalance
 
     @pyqtProperty(QEAmount, notify=balanceChanged)
@@ -443,6 +444,12 @@ class QEWallet(AuthMixin, QObject, QtEventListener):
             self._lightningcanreceive.satsInt = int(self.wallet.lnworker.num_sats_can_receive())
         return self._lightningcanreceive
 
+    @pyqtProperty(int, notify=peersUpdated)
+    def lightningNumPeers(self):
+        if self.isLightning:
+            return self.wallet.lnworker.num_peers()
+        return 0
+
     @pyqtSlot()
     def enableLightning(self):
         self.wallet.init_lightning(password=None) # TODO pass password if needed