diff -r 6b13e4c2e97b -r b75c6cce02e2 src/MessageLog.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/MessageLog.h	Tue Jan 21 02:03:27 2014 +0200
@@ -0,0 +1,70 @@
+/*
+ *  LDForge: LDraw parts authoring CAD
+ *  Copyright (C) 2013, 2014 Santeri Piippo
+ *
+ *  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 3 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/>.
+ */
+
+#ifndef LDFORGE_MESSAGELOG_H
+#define LDFORGE_MESSAGELOG_H
+
+#include <QObject>
+#include <QDate>
+#include "Main.h"
+#include "Types.h"
+
+class GLRenderer;
+class QTimer;
+
+/* The message manager is an object which keeps track of messages that appear
+ * on the renderer's screen. Each line is contained in a separate object which
+ * contains the text, expiry time and alpha. The message manager is doubly
+ * linked to its corresponding renderer.
+ *
+ * Message manager calls its tick() function regularly to update the messages,
+ * where each line's expiry is checked for. Lines begin to fade out when nearing
+ * their expiry. If the message manager's lines change, the renderer undergoes
+ * repainting.
+ */
+class MessageManager : public QObject
+{
+	Q_OBJECT
+	PROPERTY (public,	GLRenderer*,	Renderer,	NO_OPS,	STOCK_WRITE)
+
+	public:
+		// Single line of the message log.
+		class Line
+		{
+			public:
+				Line (QString text);
+				bool update (bool& changed);
+
+				QString text;
+				float alpha;
+				QDateTime expiry;
+		};
+
+		explicit MessageManager (QObject* parent = 0);
+		void addLine (QString line);
+		const QList<Line>& getLines() const;
+
+	private:
+		QList<Line> m_lines;
+		QTimer* m_ticker;
+
+	private slots:
+		void tick();
+};
+
+#endif // LDFORGE_MESSAGELOG_H