comparison data/model/RelativelyFineZoomConstraint.h @ 1552:05c3fbaec8ea

Introduce RelativelyFineZoomConstraint, which encodes more-or-less the scheme that was already used for the horizontal thumbwheel in the pane (which overrode the layers' own zoom constraints unless they said they couldn't support any other)

+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Sonic Visualiser
+    An audio file viewer and annotation editor.
+    Centre for Digital Music, Queen Mary, University of London.
+    
+    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.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#ifndef SV_RELATIVELY_FINE_ZOOM_CONSTRAINT_H
+#define SV_RELATIVELY_FINE_ZOOM_CONSTRAINT_H
+
+#include "base/ZoomConstraint.h"
+
+class RelativelyFineZoomConstraint : virtual public ZoomConstraint
+{
+public:
+    virtual ZoomLevel getNearestZoomLevel(ZoomLevel requested,
+                                          RoundingDirection dir = RoundNearest)
+	const override;
+};
+
+#endif
+