Ruler.h

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  Ruler.h
 
  Dominic Mazzoni
 
**********************************************************************/
 
#ifndef __AUDACITY_RULER__
#define __AUDACITY_RULER__
 
#include "RulerUpdater.h" // member variable
#include "NumberScale.h" // member variable
 
#include "Observer.h"
 
#include <wx/colour.h> // member variable
#include <wx/font.h> // member variable
#include <wx/pen.h> // member variable
 
class wxDC;
 
class Envelope;
class RulerFormat;
 
#include "TranslatableString.h"
 
struct RulerInvalidatedMessage {};
 
class AUDACITY_DLL_API Ruler :
    public Observer::Publisher<RulerInvalidatedMessage>
{
 public:
 
    struct TickLengths {
       int majorLength, minorLength, minorMinorLength;
    };
 
   //
   // Constructor / Destructor
   //
 
   Ruler(const RulerUpdater &updater, const RulerFormat &format);
   ~Ruler();
 
   //
   // Required Ruler Parameters
   //
 
   void SetBounds(int left, int top, int right, int bottom);
 
   // wxHORIZONTAL || wxVERTICAL
   void SetOrientation(int orient);
 
   // min is the value at (x, y)
   // max is the value at (x+width, y+height)
   // (at the center of the pixel, in both cases)
   void SetRange(double min, double max);
 
   // An overload needed for the special case of fisheye
   // min is the value at (x, y)
   // max is the value at (x+width, y+height)
   // hiddenMin, hiddenMax are the values that would be shown without the fisheye.
   // (at the center of the pixel, in both cases)
   void SetRange(double min, double max, double hiddenMin, double hiddenMax);
 
   // Set the kind of updater the ruler will use (Linear, Logarithmic, Custom, etc.)
   // Invalidates the ruler.  However ruler doesn't invalidate automatically
   // if the updater's state is mutated elsewhere.
   void SetUpdater(const RulerUpdater *pUpdater);
 
   //
   // Optional Ruler Parameters
   //
 
   // If twoTone is true, cause zero and positive numbers to appear black, negative in another color.
   void SetTwoTone(bool twoTone);
 
   // Set the format to be used for generating tick labels and tick spacing for some updaters
   // Invalidates the ruler.  However ruler doesn't invalidate automatically
   // if the formatter's state is mutated elsewhere.
   void SetFormat(const RulerFormat *pFormat);
 
   // Specify the name of the units (like "dB") if you
   // want numbers like "1.6" formatted as "1.6 dB".
   void SetUnits(const TranslatableString &units);
   void SetDbMirrorValue( const double d );
 
   // If this is true, the edges of the ruler will always
   // receive a label.  If not, the nearest round number is
   // labeled (which may or may not be the edge).
   void SetLabelEdges(bool labelEdges);
 
   // Makes a vertical ruler hug the left side (instead of right)
   // and a horizontal ruler hug the top (instead of bottom)
   void SetFlip(bool flip);
 
   // Set it to false if you don't want minor labels.
   void SetMinor(bool value);
 
   // Good defaults are provided, but you can override here
   void SetFonts(const wxFont &minorFont, const wxFont &majorFont, const wxFont &minorMinorFont);
   RulerStruct::Fonts GetFonts() const;
 
   void SetNumberScale(const NumberScale &scale);
 
   void SetTickLengths(const TickLengths& tLengths);
 
   // The ruler will not draw text within this (pixel) range.
   // Use this if you have another graphic object obscuring part
   // of the ruler's area.  The values start and end are interpreted
   // relative to the Ruler's local coordinates.
   void OfflimitsPixels(int start, int end);
 
   //
   // Calculates and returns the maximum size required by the ruler
   //
   void GetMaxSize(wxCoord *width, wxCoord *height);
 
   //
   // Drawing
   //
 
   // Note that it will not erase for you...
   void Draw(wxDC& dc) const;
   void Draw(wxDC& dc, const Envelope* envelope) const;
   // If length <> 0, draws lines perpendiculars to ruler corresponding
   // to selected ticks (major, minor, or both), in an adjacent window.
   // You may need to use the offsets if you are using part of the dc for rulers, borders etc.
   void DrawGrid(wxDC& dc, int length, bool minor = true, bool major = true, int xOffset = 0, int yOffset = 0) const;
 
   // So we can have white ticks on black...
   void SetTickColour( const wxColour & colour)
   { mTickColour = colour; mPen.SetColour( colour );}
 
   // Force regeneration of labels at next draw time
   void Invalidate();
 
 private:
 
   void ChooseFonts( wxDC &dc ) const;
 
   void UpdateCache( wxDC &dc, const Envelope* envelope ) const;
   
public:
   bool mbTicksOnly; // true => no line the length of the ruler
   bool mbTicksAtExtremes;
 
private:
 
   RulerStruct mRulerStruct;
   TickLengths mTickLengths;
 
   wxColour mTickColour;
 
   wxPen mPen;
 
   std::unique_ptr<RulerStruct::Fonts> mpUserFonts;
 
   const RulerUpdater *mpUpdater{};
 
   RulerUpdater::Bits mUserBits;
 
   struct Cache;
   mutable std::unique_ptr<Cache> mpCache;
 
   // Returns 'zero' label coordinate (for grid drawing)
   int FindZero( const RulerUpdater::Labels &labels ) const;
 
   int GetZeroPosition() const;
 
   bool         mbMinor;
   bool         mTwoTone;
};
 
#endif //define __AUDACITY_RULER__