qml: add and wire par (script threads) settings to OptionsModel backend

Author: jarolrod

src/qml/components/DeveloperOptions.qml

@@ -39,7 +39,8 @@ ColumnLayout {
         header: qsTr("Script verification threads")
         actionItem: ValueInput {
             parentState: parSetting.state
-            description: ("0")
+            description: optionsModel.scriptThreads
+            onEditingFinished: optionsModel.scriptThreads = parseInt(text)
         }
         onClicked: loadedItem.forceActiveFocus()
     }

src/qml/options_model.cpp

@@ -11,6 +11,7 @@
 #include <univalue.h>
 #include <util/settings.h>
 #include <util/system.h>
+#include <validation.h>
 
 #include <cassert>
 
@@ -22,6 +23,8 @@ OptionsQmlModel::OptionsQmlModel(interfaces::Node& node)
     int64_t prune_value{SettingToInt(m_node.getPersistentSetting("prune"), 0)};
     m_prune = (prune_value > 1);
     m_prune_size_gb = m_prune ? PruneMiBtoGB(prune_value) : DEFAULT_PRUNE_TARGET_GB;
+
+    m_script_threads = SettingToInt(m_node.getPersistentSetting("par"), DEFAULT_SCRIPTCHECK_THREADS);
 }
 
 void OptionsQmlModel::setDbcacheSizeMiB(int new_dbcache_size_mib)
@@ -69,6 +72,15 @@ void OptionsQmlModel::setPruneSizeGB(int new_prune_size_gb)
     }
 }
 
+void OptionsQmlModel::setScriptThreads(int new_script_threads)
+{
+    if (new_script_threads != m_script_threads) {
+        m_script_threads = new_script_threads;
+        m_node.updateRwSetting("par", new_script_threads);
+        Q_EMIT scriptThreadsChanged(new_script_threads);
+    }
+}
+
 void OptionsQmlModel::setServer(bool new_server)
 {
     if (new_server != m_server) {

src/qml/options_model.h

@@ -22,6 +22,7 @@ class OptionsQmlModel : public QObject
     Q_PROPERTY(bool natpmp READ natpmp WRITE setNatpmp NOTIFY natpmpChanged)
     Q_PROPERTY(bool prune READ prune WRITE setPrune NOTIFY pruneChanged)
     Q_PROPERTY(int pruneSizeGB READ pruneSizeGB WRITE setPruneSizeGB NOTIFY pruneSizeGBChanged)
+    Q_PROPERTY(int scriptThreads READ scriptThreads WRITE setScriptThreads NOTIFY scriptThreadsChanged)
     Q_PROPERTY(bool server READ server WRITE setServer NOTIFY serverChanged)
     Q_PROPERTY(bool upnp READ upnp WRITE setUpnp NOTIFY upnpChanged)
 
@@ -38,6 +39,8 @@ class OptionsQmlModel : public QObject
     void setPrune(bool new_prune);
     int pruneSizeGB() const { return m_prune_size_gb; }
     void setPruneSizeGB(int new_prune_size);
+    int scriptThreads() const { return m_script_threads; }
+    void setScriptThreads(int new_script_threads);
     bool server() const { return m_server; }
     void setServer(bool new_server);
     bool upnp() const { return m_upnp; }
@@ -49,6 +52,7 @@ class OptionsQmlModel : public QObject
     void natpmpChanged(bool new_natpmp);
     void pruneChanged(bool new_prune);
     void pruneSizeGBChanged(int new_prune_size_gb);
+    void scriptThreadsChanged(int new_script_threads);
     void serverChanged(bool new_server);
     void upnpChanged(bool new_upnp);
 
@@ -61,6 +65,7 @@ class OptionsQmlModel : public QObject
     bool m_natpmp;
     bool m_prune;
     int m_prune_size_gb;
+    int m_script_threads;
     bool m_server;
     bool m_upnp;