Add a Config.h public header, to configure behaviour

Like enabling aero snap or native title bar

src/Config.cpp

@@ -0,0 +1,80 @@
+/*
+  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\>
+ */
+
+#include "Config.h"
+#include <QApplication>
+#include <QDebug>
+
+using namespace KDDockWidgets;
+
+class Config::Private
+{
+public:
+    Private()
+    {
+    }
+
+    Flags m_flags = Flag_Default;
+
+};
+
+
+Config::Config()
+    : d(new Private())
+{
+}
+
+Config& Config::instance()
+{
+    static Config config;
+    return config;
+}
+
+Config::~Config()
+{
+    delete d;
+}
+
+Config::Flags Config::flags() const
+{
+    return d->m_flags;
+}
+
+void Config::setFlags(Flags f)
+{
+    if (!qApp) {
+        qWarning() << Q_FUNC_INFO << "Only use this function before creating the QApplication";
+        return;
+    }
+
+    if ((f & Flag_AeroSnapWithClientDecos) && (f & Flag_NativeTitleBar)) {
+        // We're either using native or client decorations
+        f = f & ~Flag_AeroSnapWithClientDecos;
+    }
+
+    d->m_flags = f;
+}