add settings for default unit (angstrom/nanometer)

GUI/Application/ApplicationSettings.cpp

@@ -25,6 +25,7 @@ const QString S_POS = "Pos";
 const QString S_DEFAULT_FUNCTIONALITIES = "DefaultFunctionalities";
 const QString S_SINGLE_INSTRUMENT_MODE = "SingleInstrumentMode";
 const QString S_SINGLE_SAMPLE_MODE = "SingleSampleMode";
+const QString S_DEFAULT_UNIT_IS_ANGSTROM = "DefaultUnitIsAngstrom";
 } // namespace
 
 bool ApplicationSettings::useNativeFileDialog() const
@@ -86,6 +87,16 @@ void ApplicationSettings::setDefaultIsSingleSampleMode(bool b)
     QSettings().setValue(S_SINGLE_SAMPLE_MODE, b);
 }
 
+bool ApplicationSettings::defaultUnitIsAngstrom() const
+{
+    return QSettings().value(S_DEFAULT_UNIT_IS_ANGSTROM, false).toBool();
+}
+
+void ApplicationSettings::setDefaultUnitIsAngstrom(bool b) const
+{
+    QSettings().setValue(S_DEFAULT_UNIT_IS_ANGSTROM, b);
+}
+
 void ApplicationSettings::saveWindowSizeAndPos(const QWidget* w)
 {
     ASSERT(!w->objectName().isEmpty());

GUI/Application/ApplicationSettings.h

@@ -41,6 +41,9 @@ public:
     bool defaultIsSingleSampleMode() const;
     void setDefaultIsSingleSampleMode(bool b);
 
+    bool defaultUnitIsAngstrom() const;
+    void setDefaultUnitIsAngstrom(bool b) const;
+
     void saveWindowSizeAndPos(const QWidget* w);
     void loadWindowSizeAndPos(QWidget* w);
 };

GUI/mainwindow/actionmanager.cpp

@@ -254,6 +254,20 @@ void ActionManager::onAboutToShowSettingsMenu()
 
     m_settingsMenu->addSeparator();
 
+    QActionGroup* unitActions = new QActionGroup(this);
+    const auto addUnitAction = [=](const QString& text, bool isAngstrom) {
+        auto action = m_settingsMenu->addAction(
+            text, [=]() { baApp->settings().setDefaultUnitIsAngstrom(isAngstrom); });
+        action->setCheckable(true);
+        action->setChecked(baApp->settings().defaultUnitIsAngstrom() == isAngstrom);
+        unitActions->addAction(action);
+    };
+
+    addUnitAction("Use nanometer as default unit", false);
+    addUnitAction("Use \303\205ngstrom as default unit", true);
+
+    m_settingsMenu->addSeparator();
+
     QActionGroup* styleActions = new QActionGroup(this);
     const auto addStyleAction = [=](const QString& text, ApplicationSettings::Style style) {
         auto action = m_settingsMenu->addAction(text, [=]() {