examples: Move custom_titlebar code into kddockwidgets_example

Guarded with a command line switch, no need to have two examples

examples/dockwidgets/MyFrameworkWidgetFactory.h

@@ -0,0 +1,32 @@
+/*
+  This file is part of KDDockWidgets.
+
+  Copyright (C) 2018-2019 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/>.
+*/
+
+#include <kddockwidgets/FrameworkWidgetFactory.h>
+#include <kddockwidgets/TitleBar_p.h>
+#include <QPainter>
+
+class CustomWidgetFactory : public KDDockWidgets::DefaultWidgetFactory
+{
+public:
+    KDDockWidgets::TitleBar *createTitleBar(KDDockWidgets::Frame *frame) const override;
+    KDDockWidgets::TitleBar *createTitleBar(KDDockWidgets::FloatingWindow *fw) const override;
+    KDDockWidgets::Separator *createSeparator(KDDockWidgets::Anchor *anchor,
+                                              KDDockWidgets::QWidgetAdapter *parent = nullptr) const override;
+};