qml: add tx options to ConfirmTxDialog, RbfBumpFeeDialog

electrum/gui/qml/components/ConfirmTxDialog.qml

@@ -137,6 +137,66 @@ ElDialog {
                     }
                 }
 
+                ToggleLabel {
+                    id: optionstoggle
+                    Layout.columnSpan: 2
+                    labelText: qsTr('Options')
+                    color: Material.accentColor
+                }
+
+                TextHighlightPane {
+                    Layout.columnSpan: 2
+                    Layout.fillWidth: true
+                    visible: !optionstoggle.collapsed
+                    height: optionslayout.height
+
+                    GridLayout {
+                        id: optionslayout
+                        width: parent.width
+                        columns: 2
+
+                        ElCheckBox {
+                            Layout.fillWidth: true
+                            text: qsTr('Use multiple change addresses')
+                            onCheckedChanged: {
+                                if (activeFocus) {
+                                    Daemon.currentWallet.multipleChange = checked
+                                    finalizer.doUpdate()
+                                }
+                            }
+                            Component.onCompleted: {
+                                checked = Daemon.currentWallet.multipleChange
+                            }
+                        }
+
+                        HelpButton {
+                            heading: qsTr('Use multiple change addresses')
+                            helptext: qsTr('To somewhat protect your privacy, Electrum tries to create change with similar precision to other outputs.')
+                        }
+
+                        ElCheckBox {
+                            Layout.fillWidth: true
+                            text: qsTr('Enable output value rounding')
+                            onCheckedChanged: {
+                                if (activeFocus) {
+                                    Config.outputValueRounding = checked
+                                    finalizer.doUpdate()
+                                }
+                            }
+                            Component.onCompleted: {
+                                checked = Config.outputValueRounding
+                            }
+                        }
+
+                        HelpButton {
+                            heading: qsTr('Enable output value rounding')
+                            helptext: qsTr('In some cases, use up to 3 change addresses in order to break up large coin amounts and obfuscate the recipient address.')
+                                    + ' ' + qsTr('This may result in higher transactions fees.')
+                        }
+
+                    }
+                }
+
                 InfoTextArea {
                     Layout.columnSpan: 2
                     Layout.fillWidth: true

electrum/gui/qml/components/RbfBumpFeeDialog.qml

@@ -120,6 +120,46 @@ ElDialog {
                     }
                 }
 
+                ToggleLabel {
+                    id: optionstoggle
+                    Layout.columnSpan: 2
+                    labelText: qsTr('Options')
+                    color: Material.accentColor
+                }
+
+                TextHighlightPane {
+                    Layout.columnSpan: 2
+                    Layout.fillWidth: true
+                    visible: !optionstoggle.collapsed
+                    height: optionslayout.height
+
+                    GridLayout {
+                        id: optionslayout
+                        width: parent.width
+                        columns: 2
+
+                        ElCheckBox {
+                            Layout.fillWidth: true
+                            text: qsTr('Enable output value rounding')
+                            onCheckedChanged: {
+                                if (activeFocus) {
+                                    Config.outputValueRounding = checked
+                                    rbffeebumper.doUpdate()
+                                }
+                            }
+                            Component.onCompleted: {
+                                checked = Config.outputValueRounding
+                            }
+                        }
+
+                        HelpButton {
+                            heading: qsTr('Enable output value rounding')
+                            helptext: qsTr('In some cases, use up to 3 change addresses in order to break up large coin amounts and obfuscate the recipient address.')
+                                    + ' ' + qsTr('This may result in higher transactions fees.')
+                        }
+                    }
+                }
+
                 InfoTextArea {
                     Layout.columnSpan: 2
                     Layout.preferredWidth: parent.width * 3/4

electrum/gui/qml/qeconfig.py

@@ -244,6 +244,17 @@ class QEConfig(AuthMixin, QObject):
             self.config.GUI_QML_ADDRESS_LIST_SHOW_USED = addresslistShowUsed
             self.addresslistShowUsedChanged.emit()
 
+    outputValueRoundingChanged = pyqtSignal()
+    @pyqtProperty(bool, notify=outputValueRoundingChanged)
+    def outputValueRounding(self):
+        return self.config.WALLET_COIN_CHOOSER_OUTPUT_ROUNDING
+
+    @outputValueRounding.setter
+    def outputValueRounding(self, outputValueRounding):
+        if outputValueRounding != self.config.WALLET_COIN_CHOOSER_OUTPUT_ROUNDING:
+            self.config.WALLET_COIN_CHOOSER_OUTPUT_ROUNDING = outputValueRounding
+            self.outputValueRoundingChanged.emit()
+
     @pyqtSlot('qint64', result=str)
     @pyqtSlot(QEAmount, result=str)
     def formatSatsForEditing(self, satoshis):

electrum/gui/qml/qetxfinalizer.py

@@ -214,6 +214,10 @@ class TxFeeSlider(FeeSlider):
     def valid(self):
         return self._valid
 
+    @pyqtSlot()
+    def doUpdate(self):
+        self.update()
+
     def update_from_tx(self, tx):
         tx_size = tx.estimated_size()
         fee = tx.get_fee()

electrum/gui/qml/qewallet.py

@@ -161,6 +161,18 @@ class QEWallet(AuthMixin, QObject, QtEventListener):
             self._logger.info(progress)
             self.synchronizingProgressChanged.emit()
 
+    multipleChangeChanged = pyqtSignal()
+    @pyqtProperty(bool, notify=multipleChangeChanged)
+    def multipleChange(self):
+        return self.wallet.multiple_change
+
+    @multipleChange.setter
+    def multipleChange(self, multiple_change):
+        if self.wallet.multiple_change != multiple_change:
+            self.wallet.multiple_change = multiple_change
+            self.wallet.db.put('multiple_change', self.wallet.multiple_change)
+            self.multipleChangeChanged.emit()
+
     @qt_event_listener
     def on_event_request_status(self, wallet, key, status):
         if wallet == self.wallet: