refs #452 overlay messages (allows to display overlay messages in a widget)

* the overlay widget itself
* a QFrame derived class allowing to display such widgets as overlay

src/blackgui/overlaymessagesframe.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.
+ */
+
+//! \file
+
+#ifndef BLACKGUI_OVERLAYMESSAGES_FRAME_H
+#define BLACKGUI_OVERLAYMESSAGES_FRAME_H
+
+#include "blackgui/overlaymessages.h"
+#include <QFrame>
+
+namespace BlackGui
+{
+    /*!
+     * Display status messages (nested in another widget)
+     */
+    class COverlayMessagesFrame : public QFrame
+    {
+        Q_OBJECT
+
+    public:
+        //! Constructor
+        explicit COverlayMessagesFrame(QWidget *parent = nullptr);
+
+        //! Destructor
+        ~COverlayMessagesFrame();
+
+        //! Show the inner frame
+        void showStatusMessagesFrame();
+
+        //! Hide the inner frame
+        void hideStatusMessagesFrame();
+
+        //! Show multiple messages
+        void showMessages(const BlackMisc::CStatusMessageList &messages);
+
+        //! Show single message
+        void showMessage(const BlackMisc::CStatusMessage &message);
+
+    protected:
+        //! \copydoc QFrame::paintEvent
+        virtual void paintEvent(QPaintEvent *event) override;
+
+        //! \copydoc QFrame::keyPressEvent
+        virtual void keyPressEvent(QKeyEvent *event) override;
+
+        COverlayMessages *m_statusMessages = nullptr; //!< embedded QFrame with Status messages
+
+    private:
+        //! Calculate inner frame size
+        QSize innerFrameSize() const;
+
+        //! Init the inner frame (if not yet initialized)
+        void initInnerFrame();
+    };
+
+} // ns
+
+#endif // guard