qml: add and wire listen setting to OptionsModel backend

Github-Pull: #222
Rebased-From: faeb551

Author: jarolrod

src/qml/BitcoinApp/Components/ConnectionSettings.qml

@@ -13,7 +13,10 @@ ColumnLayout {
         Layout.fillWidth: true
         header: qsTr("Enable listening")
         description: qsTr("Allows incoming connections")
-        actionItem: OptionSwitch {}
+        actionItem: OptionSwitch {
+            checked: optionsModel.listen
+            onToggled: optionsModel.listen = checked
+        }
     }
     Setting {
         Layout.fillWidth: true

src/qml/BitcoinApp/options_model.cpp

@@ -21,6 +21,15 @@ OptionsQmlModel::OptionsQmlModel(interfaces::Node& node)
     m_prune_size_gb = m_prune ? PruneMiBtoGB(prune_value) : DEFAULT_PRUNE_TARGET_GB;
 }
 
+void OptionsQmlModel::setListen(bool new_listen)
+{
+    if (new_listen != m_listen) {
+        m_listen = new_listen;
+        m_node.updateRwSetting("listen", new_listen);
+        Q_EMIT listenChanged(new_listen);
+    }
+}
+
 void OptionsQmlModel::setPrune(bool new_prune)
 {
     if (new_prune != m_prune) {

src/qml/BitcoinApp/options_model.h

@@ -17,25 +17,30 @@ class Node;
 class OptionsQmlModel : public QObject
 {
     Q_OBJECT
+    Q_PROPERTY(bool listen READ listen WRITE setListen NOTIFY listenChanged)
     Q_PROPERTY(bool prune READ prune WRITE setPrune NOTIFY pruneChanged)
     Q_PROPERTY(int pruneSizeGB READ pruneSizeGB WRITE setPruneSizeGB NOTIFY pruneSizeGBChanged)
 
 public:
     explicit OptionsQmlModel(interfaces::Node& node);
 
+    bool listen() const { return m_listen; }
+    void setListen(bool new_listen);
     bool prune() const { return m_prune; }
     void setPrune(bool new_prune);
     int pruneSizeGB() const { return m_prune_size_gb; }
     void setPruneSizeGB(int new_prune_size);
 
 Q_SIGNALS:
+    void listenChanged(bool new_listen);
     void pruneChanged(bool new_prune);
     void pruneSizeGBChanged(int new_prune_size_gb);
 
 private:
     interfaces::Node& m_node;
 
     // Properties that are exposed to QML.
+    bool m_listen;
     bool m_prune;
     int m_prune_size_gb;