Split EnvelopeEditor.cpp from Envelope.cpp...

... Envelope drops down out of the big strongly connected component, the new
piece stays behind

src/EnvelopeEditor.h

@@ -0,0 +1,82 @@
+/**********************************************************************
+
+  Audacity: A Digital Audio Editor
+
+  EnvelopeEditor.h
+
+  Paul Licameli split this from Envelope.h
+
+**********************************************************************/
+
+#ifndef __AUDACITY_ENVELOPE_EDITOR__
+#define __AUDACITY_ENVELOPE_EDITOR__
+
+class wxMouseEvent;
+class wxRect;
+class Envelope;
+class TrackPanelDrawingContext;
+class ZoomInfo;
+
+// A class that holds state for the duration of dragging
+// of an envelope point.
+class EnvelopeEditor
+{
+public:
+   static void DrawPoints(
+      const Envelope &env,
+      TrackPanelDrawingContext &context,
+      const wxRect & r,
+      bool dB, double dBRange,
+      float zoomMin, float zoomMax, bool mirrored);
+
+   /** \brief Get many envelope points for pixel columns at once,
+    * but don't assume uniform time per pixel.
+   */
+   static void GetValues
+      ( const Envelope &env,
+        double aligned_time, double sampleDur,
+        double *buffer, int bufferLen, int leftOffset,
+        const ZoomInfo &zoomInfo);
+
+   EnvelopeEditor(Envelope &envelope, bool mirrored);
+   ~EnvelopeEditor();
+
+   // Event Handlers
+   // Each of these returns true if the envelope needs to be redrawn
+   bool MouseEvent(const wxMouseEvent & event, wxRect & r,
+      const ZoomInfo &zoomInfo, bool dB, double dBRange,
+      float zoomMin = -1.0, float zoomMax = 1.0);
+
+private:
+   bool HandleMouseButtonDown(const wxMouseEvent & event, wxRect & r,
+      const ZoomInfo &zoomInfo, bool dB, double dBRange,
+      float zoomMin = -1.0, float zoomMax = 1.0);
+   bool HandleDragging(const wxMouseEvent & event, wxRect & r,
+      const ZoomInfo &zoomInfo, bool dB, double dBRange,
+      float zoomMin = -1.0, float zoomMax = 1.0, float eMin = 0., float eMax = 2.);
+   bool HandleMouseButtonUp();
+
+private:
+   float ValueOfPixel(int y, int height, bool upper,
+      bool dB, double dBRange,
+      float zoomMin, float zoomMax);
+   void MoveDragPoint(const wxMouseEvent & event, wxRect & r,
+      const ZoomInfo &zoomInfo, bool dB, double dBRange,
+      float zoomMin, float zoomMax);
+
+   Envelope &mEnvelope;
+   const bool mMirrored;
+
+   /** \brief Number of pixels contour is from the true envelope. */
+   int mContourOffset;
+
+   // double mInitialVal;
+
+   // int mInitialY;
+   bool mUpper;
+   int mButton;
+   bool mDirty;
+};
+
+
+#endif