comparison layer/SliceableLayer.h @ 193:57c2350a8c40

* Add slice layers (so you can display a slice of a colour 3d plot as if it were
  a spectrum)
* Make spectrum layer a subclass of slice layer

+/* -*- 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 file copyright 2007 QMUL.
+    
+    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 _SLICEABLE_LAYER_H_
+#define _SLICEABLE_LAYER_H_
+
+#include "Layer.h"
+
+/**
+ * Base class for layers that can be sliced, that is, that contain
+ * models appropriate for use in a SliceLayer.
+ */
+
+class SliceableLayer : public Layer
+{
+    Q_OBJECT
+
+public:
+    // Get a model that can be sliced, i.e. a
+    // DenseThreeDimensionalModel.  This may be the layer's usual
+    // model, or it may be a model derived from it (e.g. FFTModel in a
+    // spectrogram that was constructed from a DenseTimeValueModel).
+    // The SliceableLayer retains ownership of the model, and will
+    // emit sliceableModelReplaced if it is about to become invalid.
+    virtual const Model *getSliceableModel() const = 0;
+
+signals:
+    // Emitted when a model that was obtained through
+    // getSliceableModel is about to be deleted.  If replacement is
+    // non-NULL, it may be used instead.
+    void sliceableModelReplaced(const Model *modelToBeReplaced,
+                                const Model *replacement);
+};
+
+#endif
+
+
+