comparison base/Layer.h @ 10:ec6886f0e673

* Fix update and play limits for play-selection mode when not looping
* Fix playback in loop mode when no selection -- but the GUI update for
  this is still wrong on the flyback
* Various fixes and improvements to making selections, particularly during
  playback
* Draw selection under non-opaque non-scrollable layers, so as to improve
  cacheing
* Show selection limits as text when drawing selection
* Allow user to find missing audio files when loading session
* Cross-fade selections when in play-selection mode -- mostly.  We don't
  cross-fade on a processing block boundary, and unfortunately with short
  selections the selection boundary is quite likely to coincide with a block
  boundary.

      * scrolled safely in this way.
      */
     virtual bool isLayerScrollable() const { return true; }
 
     /**
+     * This should return true if the layer completely obscures any
+     * underlying layers.  It's used to determine whether the view can
+     * safely draw any selection rectangles under the layer instead of
+     * over it, in the case where the layer is not scrollable and
+     * therefore needs to be redrawn each time (so that the selection
+     * rectangle can be cached).
+     */
+    virtual bool isLayerOpaque() const { return false; }
+
+    /**
      * Return the proportion of background work complete in drawing
      * this view, as a percentage -- in most cases this will be the
      * value returned by pointer from a call to the underlying model's
      * isReady(int *) call.  The widget may choose to show a progress
      * meter if it finds that this returns < 100 at any given moment.