qml: PIN protect wallet seed display

electrum/gui/qml/components/WalletDetails.qml

@@ -259,8 +259,12 @@ Pane {
                                 MouseArea {
                                     anchors.fill: parent
                                     onClicked: {
-                                        seedText.visible = true
-                                        showSeedText.visible = false
+                                        if (showSeedText.visible) {
+                                            Daemon.currentWallet.requestShowSeed()
+                                        } else {
+                                            seedText.visible = false
+                                            showSeedText.visible = true
+                                        }
                                     }
                                 }
                             }
@@ -590,6 +594,10 @@ Pane {
         function onBalanceChanged() {
             piechart.updateSlices()
         }
+        function onSeedRetrieved() {
+            seedText.visible = true
+            showSeedText.visible = false
+        }
     }
 
     Component {

electrum/gui/qml/qewallet.py

@@ -71,6 +71,7 @@ class QEWallet(AuthMixin, QObject, QtEventListener):
     otpSuccess = pyqtSignal()
     otpFailed = pyqtSignal([str,str], arguments=['code','message'])
     peersUpdated = pyqtSignal()
+    seedRetrieved = pyqtSignal()
 
     _network_signal = pyqtSignal(str, object)
 
@@ -97,6 +98,7 @@ class QEWallet(AuthMixin, QObject, QtEventListener):
         self._lightningcanreceive = QEAmount()
         self._lightningcansend = QEAmount()
 
+        self._seed = ''
 
         self.tx_notification_queue = queue.Queue()
         self.tx_notification_last_time = 0
@@ -330,10 +332,7 @@ class QEWallet(AuthMixin, QObject, QtEventListener):
 
     @pyqtProperty(str, notify=dataChanged)
     def seed(self):
-        try:
-            return self.wallet.get_seed(self.password)
-        except:
-            return ''
+        return self._seed
 
     @pyqtProperty(str, notify=dataChanged)
     def txinType(self):
@@ -736,3 +735,17 @@ class QEWallet(AuthMixin, QObject, QtEventListener):
             return True
         except Exception as e:
             return False
+
+    @pyqtSlot()
+    def requestShowSeed(self):
+        self.retrieve_seed()
+
+    @auth_protect
+    def retrieve_seed(self):
+        try:
+            self._seed = self.wallet.get_seed(self.password)
+            self.seedRetrieved.emit()
+        except:
+            self._seed = ''
+
+        self.dataChanged.emit()