Shared namespace refactoring, enum class refactoring, going offline related crash fix

shared/global.h

@@ -0,0 +1,64 @@
+/*
+ * Squawk messenger. 
+ * Copyright (C) 2019  Yury Gubich <blue@macaw.me>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef SHARED_GLOBAL_H
+#define SHARED_GLOBAL_H
+
+#include "enums.h"
+#include "message.h"
+
+#include <map>
+
+#include <QCoreApplication>
+#include <QDebug>
+
+namespace Shared {
+    
+    class Global {
+        Q_DECLARE_TR_FUNCTIONS(Global)
+        
+    public:
+        Global();
+        
+        static Global* getInstance();
+        static QString getName(Availability av);
+        static QString getName(ConnectionState cs);
+        static QString getName(SubscriptionState ss);
+        static QString getName(Affiliation af);
+        static QString getName(Role rl);
+        static QString getName(Message::State rl);
+        
+        const std::deque<QString> availability;
+        const std::deque<QString> connectionState;
+        const std::deque<QString> subscriptionState;
+        const std::deque<QString> affiliation;
+        const std::deque<QString> role;
+        const std::deque<QString> messageState;
+        
+        template<typename T>
+        static T fromInt(int src);
+        
+        template<typename T>
+        static T fromInt(unsigned int src);
+        
+    private:
+        static Global* instance;
+    };
+}
+
+#endif // SHARED_GLOBAL_H