implement enable lightning button

electrum/gui/qml/components/Wallets.qml

@@ -48,7 +48,26 @@ Pane {
             Label { text: Daemon.currentWallet.isLightning }
 
             Label { text: 'has Seed'; color: Material.accentColor }
-            Label { text: Daemon.currentWallet.hasSeed; Layout.columnSpan: 3 }
+            Label { text: Daemon.currentWallet.hasSeed }
+
+            RowLayout {
+                visible: !Daemon.currentWallet.isLightning && Daemon.currentWallet.canHaveLightning
+                Layout.columnSpan: 2
+                Layout.alignment: Qt.AlignHCenter
+
+                Button {
+                    enabled: Daemon.currentWallet.canHaveLightning && !Daemon.currentWallet.isLightning
+                    text: qsTr('Enable Lightning')
+                    onClicked: Daemon.currentWallet.enableLightning()
+                }
+            }
+
+            Item {
+                visible: Daemon.currentWallet.isLightning || !Daemon.currentWallet.canHaveLightning
+                Layout.columnSpan: 2
+                Layout.preferredHeight: 1
+                Layout.preferredWidth: 1
+            }
 
             Label { Layout.columnSpan:4; text: qsTr('Master Public Key'); color: Material.accentColor }
 

electrum/gui/qml/qewallet.py

@@ -243,6 +243,10 @@ class QEWallet(QObject):
     def isLightning(self):
         return bool(self.wallet.lnworker)
 
+    @pyqtProperty(bool, notify=dataChanged)
+    def canHaveLightning(self):
+        return self.wallet.can_have_lightning()
+
     @pyqtProperty(bool, notify=dataChanged)
     def hasSeed(self):
         return self.wallet.has_seed()
@@ -318,6 +322,10 @@ class QEWallet(QObject):
         self._lightningcanreceive = QEAmount(amount_sat=self.wallet.lnworker.num_sats_can_receive())
         return self._lightningcanreceive
 
+    @pyqtSlot()
+    def enableLightning(self):
+        self.wallet.init_lightning(password=None) # TODO pass password if needed
+        self.isLightningChanged.emit()
 
     @pyqtSlot('QString', int, int, bool)
     def send_onchain(self, address, amount, fee=None, rbf=False):