refs #618, moved menus to menu subfolder

* generated some generic menus which can be reused
* adjusted view base
* new menu to merge with DB data

src/blackgui/menus/menudelegate.h

@@ -0,0 +1,65 @@
+/* Copyright (C) 2015
+ * swift project Community / Contributors
+ *
+ * This file is part of swift Project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+#ifndef BLACKGUI_MENUS_MENUDELEGATE_H
+#define BLACKGUI_MENUS_MENUDELEGATE_H
+
+#include <QMenu>
+#include <QObject>
+
+namespace BlackGui
+{
+    namespace Menus
+    {
+        /*!
+         * Interface to implement a custom menu
+         */
+        class IMenuDelegate : public QObject
+        {
+            Q_OBJECT
+
+        public:
+            //! Display custom menu
+            virtual void customMenu(QMenu &menu) const = 0;
+
+            //! Set nested delegate
+            void setNestedDelegate(IMenuDelegate *nestedDelegate) { m_nestedDelegate = nestedDelegate; }
+
+            //! Nested delegate
+            IMenuDelegate *getNestedDelegate() const { return m_nestedDelegate; }
+
+            //! Destructor
+            virtual ~IMenuDelegate() {}
+
+        protected:
+            //! Constructor
+            IMenuDelegate(QWidget *parent = nullptr, bool separator = false) :
+                QObject(parent), m_separator(separator) {}
+
+            //! Delegate down one level
+            void nestedCustomMenu(QMenu &menu) const
+            {
+                if (!m_nestedDelegate) { return; }
+                m_nestedDelegate->customMenu(menu);
+            }
+
+            //! Add separator
+            void addSeparator(QMenu &menu) const
+            {
+                if (!m_separator || menu.isEmpty()) { return; }
+                menu.addSeparator();
+            }
+
+            IMenuDelegate *m_nestedDelegate = nullptr; //!< nested delegate if any
+            bool           m_separator      = false;   //!< at end, terminate with separator
+        };
+    } // ns
+} // ns
+
+#endif // guard