add currencies to preferences

electrum/gui/qml/components/Preferences.qml

@@ -56,6 +56,15 @@ Pane {
                     text: qsTr('Write logs to file')
                     enabled: false
                 }
+
+                Label {
+                    text: qsTr('Fiat Currency')
+                }
+
+                ComboBox {
+                    id: currencies
+                    model: Daemon.currencies
+                }
             }
 
         }
@@ -73,11 +82,13 @@ Pane {
     function save() {
         Config.baseUnit = baseUnit.currentValue
         Config.thousandsSeparator = thousands.checked
+        Config.fiatCurrency = currencies.currentValue ? currencies.currentValue : ''
         app.stack.pop()
     }
 
     Component.onCompleted: {
         baseUnit.currentIndex = ['BTC','mBTC','bits','sat'].indexOf(Config.baseUnit)
         thousands.checked = Config.thousandsSeparator
+        currencies.currentIndex = currencies.indexOfValue(Config.fiatCurrency)
     }
 }

electrum/gui/qml/qeconfig.py

@@ -68,6 +68,15 @@ class QEConfig(QObject):
         self.config.amt_add_thousands_sep = checked
         self.thousandsSeparatorChanged.emit()
 
+    fiatCurrencyChanged = pyqtSignal()
+    @pyqtProperty(str, notify=fiatCurrencyChanged)
+    def fiatCurrency(self):
+        return self.config.get('currency')
+
+    @fiatCurrency.setter
+    def fiatCurrency(self, currency):
+        self.config.set_key('currency', currency)
+        self.fiatCurrencyChanged.emit()
 
     @pyqtSlot(int, result=str)
     @pyqtSlot(int, bool, result=str)

electrum/gui/qml/qedaemon.py

@@ -96,6 +96,7 @@ class QEDaemon(QObject):
     activeWalletsChanged = pyqtSignal()
     availableWalletsChanged = pyqtSignal()
     walletOpenError = pyqtSignal([str], arguments=["error"])
+    currenciesChanged = pyqtSignal()
 
     @pyqtSlot()
     @pyqtSlot(str)
@@ -150,3 +151,7 @@ class QEDaemon(QObject):
             self._available_wallets = QEAvailableWalletListModel(self.daemon)
 
         return self._available_wallets
+
+    @pyqtProperty('QVariantList', notify=currenciesChanged)
+    def currencies(self):
+        return [''] + self.daemon.fx.get_currencies(False)