Add a Config.h public header, to configure behaviour

Like enabling aero snap or native title bar

src/Config.h

@@ -0,0 +1,73 @@
+/*
+  This file is part of KDDockWidgets.
+
+  Copyright (C) 2019 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com
+  Author: Sérgio Martins <sergio.martins@kdab.com>
+
+  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 2 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/>.
+*/
+
+/**
+ * @file
+ * @brief Application wide config to tune certain beahviours of the framework.
+ *
+ * @author Sérgio Martins \<sergio.martins@kdab.com\>
+ */
+
+#ifndef KD_DOCKWIDGETS_CONFIG_H
+#define KD_DOCKWIDGETS_CONFIG_H
+
+#include "docks_export.h"
+
+namespace KDDockWidgets
+{
+
+/**
+ * @brief Singleton to allow to choose certain behaviours for the framework.
+ *
+ * The setters should only be used before creating a QApplication.
+ */
+class DOCKS_EXPORT Config
+{
+public:
+
+    ///@brief returns the singleton Config instance
+    static Config &instance();
+
+    ~Config();
+
+    enum Flag {
+        Flag_None = 0,
+        Flag_NativeTitleBar = 1, ///> Enables the Native OS title bar on OSes that support it (Windows 10, macOS), ignored otherwise. This is mutually exclusive with Flag_AeroSnap
+        Flag_AeroSnapWithClientDecos = 2, ///> Enables AeroSnap even if we're not using the native title bar. Only supported on Windows 10.
+        Flag_Default = Flag_AeroSnapWithClientDecos ///> The defaults if nothing is set
+    };
+    Q_DECLARE_FLAGS(Flags, Flag)
+
+    ///@brief getter for the flags
+    Flags flags() const;
+
+    ///@brief setter for the flags
+    void setFlags(Flags);
+
+private:
+    Q_DISABLE_COPY(Config)
+    Config();
+    class Private;
+    Private *const d;
+};
+
+}
+
+#endif