comparison layer/Layer.h @ 187:e7cf6044c2a0

* better icon
* support range mappers in thumbwheel
* supply range mapper for vertical zoom from spectrogram
* fix bug in fftmodel for scaled ffts
* make the various widgets all respond to double-click for edit, middle-click
  for reset, ctrl-left-click for reset

 class Model;
 class QPainter;
 class View;
 class QMouseEvent;
 class Clipboard;
+class RangeMapper;
 
 /**
  * The base class for visual representations of the data found in a
  * Model.  Layers are expected to be able to draw themselves onto a
  * View, and may also be editable.

      * the layer to reset its display extents or change another
      * property such as display gain.
      */
     virtual void setVerticalZoomStep(int) { }
 
+    /**
+     * Create and return a range mapper for vertical zoom step values.
+     * See the RangeMapper documentation for more details.  The
+     * returned value is allocated on the heap and will be deleted by
+     * the caller.
+     */
+    virtual RangeMapper *getNewVerticalZoomRangeMapper() const { return 0; }
+
 public slots:
     void showLayer(View *, bool show);
 
 signals:
     void modelChanged();