Validate MP callsign with a reg-exp

src/GUI/CMakeLists.txt

@@ -81,6 +81,15 @@ if (HAVE_QT)
                             )
     qt5_add_resources(qrc_sources resources.qrc)
 
+    set(qml_sources
+        DownloadSettings.qml
+        GeneralSettings.qml
+        MPSettings.qml
+        RenderSettings.qml
+        TimeSettings.qml
+        ViewSettings.qml
+        Weather.qml
+        )
 
     add_library(fglauncher QtLauncher.cxx
                             QtLauncher.hxx
@@ -141,7 +150,8 @@ if (HAVE_QT)
                             MPServersModel.cpp
                             MPServersModel.h
                             ${uic_sources}
-                            ${qrc_sources})
+                            ${qrc_sources}
+                            ${qml_sources})
 
     set_property(TARGET fglauncher PROPERTY AUTOMOC ON)
     target_link_libraries(fglauncher Qt5::Core Qt5::Widgets Qt5::Network Qt5::Qml SimGearCore)

src/GUI/MPSettings.qml

@@ -21,9 +21,13 @@ Section {
         label: "Callsign"
         description: "Enter a callsign you will use online. This is visible to all users and is " +
                      "how ATC services and other pilots will refer to you. " +
-                     "(Maximum of ten characters permitted)"
+                     "(Maximum of seven characters permitted)"
         placeholder: "D-FGFS"
         keywords: ["callsign", "handle", "name"]
+
+        // between one and seven alphanumerics, underscores and or hypens
+        // spaces not permitted
+        validation: "[\\w-]{1,7}"
     }
 
     Combo {

src/GUI/SettingsWidgets.cxx

@@ -15,6 +15,7 @@
 #include <QQmlContext>
 #include <QDateTimeEdit>
 #include <QPainter>
+#include <QRegularExpressionValidator>
 
 #include "LaunchConfig.hxx"
 #include "SettingsSection.hxx"
@@ -504,6 +505,11 @@ QString SettingsText::placeholder() const
 #endif
 }
 
+QString SettingsText::validation() const
+{
+    return m_validation;
+}
+
 void SettingsText::setPlaceholder(QString hold)
 {
     if (placeholder() == hold)
@@ -516,6 +522,26 @@ void SettingsText::setPlaceholder(QString hold)
     emit placeholderChanged(hold);
 }
 
+void SettingsText::setValidation(QString validation)
+{
+    if (m_validation == validation)
+        return;
+
+    m_validation = validation;
+
+    QRegularExpression re(m_validation);
+    if (!re.isValid()) {
+        qWarning() << "invalid validation expression:" << re.errorString();
+        m_validation.clear();
+        validation.clear();
+        m_edit->setValidator(nullptr);
+    } else {
+        m_edit->setValidator(new QRegularExpressionValidator(re, this));
+    }
+
+    emit validationChanged(validation);
+}
+
 SettingsPath::SettingsPath(QWidget *pr) :
     SettingsControl(pr)
 {

src/GUI/SettingsWidgets.hxx

@@ -228,6 +228,9 @@ class SettingsText : public SettingsControl
 
     Q_PROPERTY(QString value READ value WRITE setValue NOTIFY valueChanged)
     Q_PROPERTY(QString placeholder READ placeholder WRITE setPlaceholder NOTIFY placeholderChanged)
+
+    Q_PROPERTY(QString validation READ validation WRITE setValidation NOTIFY validationChanged)
+
 public:
     SettingsText(QWidget *pr = nullptr);
 
@@ -243,19 +246,26 @@ public:
 
     QString placeholder() const;
 
+    QString validation() const;
+
 public slots:
     void setValue(QString value);
 
     void setPlaceholder(QString placeholder);
 
+    void setValidation(QString validation);
+
 signals:
     void valueChanged(QString value);
 
     void placeholderChanged(QString placeholder);
 
+    void validationChanged(QString validation);
+
 private:
     QLineEdit* m_edit;
     QLabel* m_label;
+    QString m_validation;
 };
 
 class SettingsPath : public SettingsControl