comparison layer/Layer.h @ 131:eaae73b6bd28

* Suspend/resume fft data server write activity while reading from a server
  to repaint the spectrogram display.  Makes a significant improvement to
  the otherwise dreadful responsiveness of spectrogram display.

 #include "base/Selection.h"
 
 #include <QObject>
 #include <QRect>
 #include <QXmlAttributes>
+#include <QMutex>
 
 #include <map>
 
 class ZoomConstraint;
 class Model;

      * view and is not expected to become visible in the near future
      * (for example because the user has explicitly removed or hidden
      * it).  The layer may respond by (for example) freeing any cache
      * memory it is using, until next time its paint method is called,
      * when it should set itself un-dormant again.
-     */
-    virtual void setLayerDormant(const View *v, bool dormant) {
-	m_dormancy[v] = dormant;
-    }
+     *
+     * A layer class that overrides this function must also call this
+     * class's implementation.
+     */
+    virtual void setLayerDormant(const View *v, bool dormant);
 
     /**
      * Return whether the layer is dormant (i.e. hidden) in the given
      * view.
      */
-    virtual bool isLayerDormant(const View *v) const {
-	if (m_dormancy.find(v) == m_dormancy.end()) return false;
-	return m_dormancy.find(v)->second;
-    }
+    virtual bool isLayerDormant(const View *v) const;
 
     virtual PlayParameters *getPlayParameters();
 
     virtual bool needsTextLabelHeight() const { return false; }
 

     void modelReplaced();
 
     void layerParametersChanged();
     void layerNameChanged();
 
-protected:
+private:
+    mutable QMutex m_dormancyMutex;
     mutable std::map<const void *, bool> m_dormancy;
 };
 
 #endif