Equalization.cpp

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/**********************************************************************

   Audacity: A Digital Audio Editor

   EffectEqualization.cpp

   Mitch Golden
   Vaughan Johnson (Preview)
   Martyn Shaw (FIR filters, response curve, graphic EQ)

*******************************************************************//****************************************************************//****************************************************************//****************************************************************//****************************************************************//*******************************************************************/


#include "../Audacity.h"
#include "Equalization.h"

#include <math.h>
#include <vector>

#include <wx/bitmap.h>
#include <wx/button.h>
#include <wx/brush.h>
#include <wx/button.h>  // not really needed here
#include <wx/dcmemory.h>
#include <wx/event.h>
#include <wx/image.h>
#include <wx/intl.h>
#include <wx/choice.h>
#include <wx/radiobut.h>
#include <wx/stattext.h>
#include <wx/string.h>
#include <wx/textdlg.h>
#include <wx/ffile.h>
#include <wx/filefn.h>
#include <wx/stdpaths.h>
#include <wx/settings.h>
#include <wx/checkbox.h>
#include <wx/tooltip.h>
#include <wx/utils.h>

#include "../Experimental.h"
#include "../AColor.h"
#include "../ShuttleGui.h"
#include "../PlatformCompatibility.h"
#include "../FileNames.h"
#include "../Envelope.h"
#include "../widgets/LinkingHtmlWindow.h"
#include "../widgets/ErrorDialog.h"
#include "../FFT.h"
#include "../Prefs.h"
#include "../Project.h"
#include "../WaveTrack.h"
#include "../widgets/Ruler.h"
#include "../xml/XMLFileReader.h"
#include "../Theme.h"
#include "../AllThemeResources.h"
#include "../float_cast.h"

#include "FileDialog.h"

#ifdef EXPERIMENTAL_EQ_SSE_THREADED
#include "Equalization48x.h"
#endif


enum
{
   ID_Length = 10000,
   ID_dBMax,
   ID_dBMin,
   ID_Clear,
   ID_Invert,
   ID_Mode,
   ID_Draw,
   ID_Graphic,
   ID_Interp,
   ID_Linear,
   ID_Grid,
   ID_Curve,
   ID_Manage,
   ID_Delete,
#ifdef EXPERIMENTAL_EQ_SSE_THREADED
   ID_DefaultMath,
   ID_SSE,
   ID_SSEThreaded,
   ID_AVX,
   ID_AVXThreaded,
   ID_Bench,
#endif
   ID_Slider,   // needs to come last
};

enum kInterpolations
{
   kBspline,
   kCosine,
   kCubic,
   nInterpolations
};

// Increment whenever EQCurves.xml is updated
#define EQCURVES_VERSION   1
#define EQCURVES_REVISION  0
#define UPDATE_ALL 0 // 0 = merge NEW presets only, 1 = Update all factory presets.

static const IdentInterfaceSymbol kInterpStrings[nInterpolations] =
{
   // These are acceptable dual purpose internal/visible names

   /* i18n-hint: Technical term for a kind of curve.*/
   { XO("B-spline") },
   { XO("Cosine") },
   { XO("Cubic") }
};

static const double kThirdOct[] =
{
   20., 25., 31., 40., 50., 63., 80., 100., 125., 160., 200.,
   250., 315., 400., 500., 630., 800., 1000., 1250., 1600., 2000.,
   2500., 3150., 4000., 5000., 6300., 8000., 10000., 12500., 16000., 20000.,
};

// Define keys, defaults, minimums, and maximums for the effect parameters
//
//     Name          Type        Key                     Def      Min      Max      Scale
Param( FilterLength, int,     wxT("FilterLength"),        4001,    21,      8191,    0      );
Param( CurveName,    wxChar*, wxT("CurveName"),           wxT("unnamed"), wxT(""), wxT(""), wxT(""));
Param( InterpLin,    bool,    wxT("InterpolateLin"),      false,   false,   true,    false  );
Param( InterpMeth,   int,     wxT("InterpolationMethod"), 0,       0,       0,       0      );
Param( DrawMode,     bool,    wxT(""),                   true,    false,   true,    false  );
Param( DrawGrid,     bool,    wxT(""),                   true,    false,   true,    false  );
Param( dBMin,        float,   wxT(""),                   -30.0,   -120.0,  -10.0,   0      );
Param( dBMax,        float,   wxT(""),                   30.0,    0.0,     60.0,    0      );

// EffectEqualization
//----------------------------------------------------------------------------

BEGIN_EVENT_TABLE(EffectEqualization, wxEvtHandler)
   EVT_SIZE( EffectEqualization::OnSize )

   EVT_SLIDER( ID_Length, EffectEqualization::OnSliderM )
   EVT_SLIDER( ID_dBMax, EffectEqualization::OnSliderDBMAX )
   EVT_SLIDER( ID_dBMin, EffectEqualization::OnSliderDBMIN )
   EVT_COMMAND_RANGE(ID_Slider,
                     ID_Slider + NUMBER_OF_BANDS - 1,
                     wxEVT_COMMAND_SLIDER_UPDATED,
                     EffectEqualization::OnSlider)
   EVT_CHOICE( ID_Interp, EffectEqualization::OnInterp )

   EVT_CHOICE( ID_Curve, EffectEqualization::OnCurve )
   EVT_BUTTON( ID_Manage, EffectEqualization::OnManage )
   EVT_BUTTON( ID_Clear, EffectEqualization::OnClear )
   EVT_BUTTON( ID_Invert, EffectEqualization::OnInvert )

   EVT_RADIOBUTTON(ID_Draw, EffectEqualization::OnDrawMode)
   EVT_RADIOBUTTON(ID_Graphic, EffectEqualization::OnGraphicMode)
   EVT_CHECKBOX(ID_Linear, EffectEqualization::OnLinFreq)
   EVT_CHECKBOX(ID_Grid, EffectEqualization::OnGridOnOff)

#ifdef EXPERIMENTAL_EQ_SSE_THREADED
   EVT_RADIOBUTTON(ID_DefaultMath, EffectEqualization::OnProcessingRadio)
   EVT_RADIOBUTTON(ID_SSE, EffectEqualization::OnProcessingRadio)
   EVT_RADIOBUTTON(ID_SSEThreaded, EffectEqualization::OnProcessingRadio)
   EVT_RADIOBUTTON(ID_AVX, EffectEqualization::OnProcessingRadio)
   EVT_RADIOBUTTON(ID_AVXThreaded, EffectEqualization::OnProcessingRadio)
   EVT_BUTTON(ID_Bench, EffectEqualization::OnBench)
#endif
END_EVENT_TABLE()

EffectEqualization::EffectEqualization()
   : mFFTBuffer{ windowSize }
   , mFilterFuncR{ windowSize }
   , mFilterFuncI{ windowSize }
{
   mCurve = NULL;
   mPanel = NULL;

   hFFT = GetFFT(windowSize);

   SetLinearEffectFlag(true);

   mM = DEF_FilterLength;
   mLin = DEF_InterpLin;
   mInterp = DEF_InterpMeth;
   mCurveName = DEF_CurveName;

   GetPrivateConfig(GetCurrentSettingsGroup(), wxT("dBMin"), mdBMin, DEF_dBMin);
   GetPrivateConfig(GetCurrentSettingsGroup(), wxT("dBMax"), mdBMax, DEF_dBMax);
   GetPrivateConfig(GetCurrentSettingsGroup(), wxT("DrawMode"), mDrawMode, DEF_DrawMode);
   GetPrivateConfig(GetCurrentSettingsGroup(), wxT("DrawGrid"), mDrawGrid, DEF_DrawGrid);

   mLogEnvelope = std::make_unique<Envelope>
      (false,
       MIN_dBMin, MAX_dBMax, // MB: this is the highest possible range
       0.0);
   mLogEnvelope->SetTrackLen(1.0);

   mLinEnvelope = std::make_unique<Envelope>
      (false,
       MIN_dBMin, MAX_dBMax, // MB: this is the highest possible range
       0.0);
   mLinEnvelope->SetTrackLen(1.0);

   mEnvelope = (mLin ? mLinEnvelope : mLogEnvelope).get();

   mWindowSize = windowSize;

   mDirty = false;
   mDisallowCustom = false;

   // Load the EQ curves
   LoadCurves();

   // Note: initial curve is set in TransferDataToWindow

   mBandsInUse = NUMBER_OF_BANDS;
   //double loLog = log10(mLoFreq);
   //double stepLog = (log10(mHiFreq) - loLog)/((double)NUM_PTS-1.);
   for(int i=0; i<NUM_PTS-1; i++)
      mWhens[i] = (double)i/(NUM_PTS-1.);
   mWhens[NUM_PTS-1] = 1.;
   mWhenSliders[NUMBER_OF_BANDS] = 1.;
   mEQVals[NUMBER_OF_BANDS] = 0.;

#ifdef EXPERIMENTAL_EQ_SSE_THREADED
   bool useSSE;
   GetPrivateConfig(GetCurrentSettingsGroup(), wxT("/SSE/GUI"), useSSE, false);
   if(useSSE && !mEffectEqualization48x)
      mEffectEqualization48x = std::make_unique<EffectEqualization48x>();
   else if(!useSSE)
      mEffectEqualization48x.reset();
   mBench=false;
#endif
}


EffectEqualization::~EffectEqualization()
{
}

// IdentInterface implementation

IdentInterfaceSymbol EffectEqualization::GetSymbol()
{
   return EQUALIZATION_PLUGIN_SYMBOL;
}

wxString EffectEqualization::GetDescription()
{
   return _("Adjusts the volume levels of particular frequencies");
}

wxString EffectEqualization::ManualPage()
{
   return wxT("Equalization");
}

// EffectDefinitionInterface implementation

EffectType EffectEqualization::GetType()
{
   return EffectTypeProcess;
}

// EffectClientInterface implementation
bool EffectEqualization::DefineParams( ShuttleParams & S ){
   S.SHUTTLE_PARAM( mM, FilterLength );
   S.SHUTTLE_PARAM( mCurveName, CurveName);
   S.SHUTTLE_PARAM( mLin, InterpLin);
   S.SHUTTLE_ENUM_PARAM( mInterp, InterpMeth, kInterpStrings, nInterpolations );

   return true;
}

bool EffectEqualization::GetAutomationParameters(CommandParameters & parms)
{
   parms.Write(KEY_FilterLength, (unsigned long)mM);
   parms.Write(KEY_CurveName, mCurveName);
   parms.Write(KEY_InterpLin, mLin);
   parms.WriteEnum(KEY_InterpMeth, mInterp, kInterpStrings, nInterpolations);

   return true;
}

bool EffectEqualization::SetAutomationParameters(CommandParameters & parms)
{
   // Pretty sure the interpolation name shouldn't have been interpreted when
   // specified in chains, but must keep it that way for compatibility.

   ReadAndVerifyInt(FilterLength);
   ReadAndVerifyString(CurveName);
   ReadAndVerifyBool(InterpLin);
   ReadAndVerifyEnum(InterpMeth, kInterpStrings, nInterpolations);

   mM = FilterLength;
   mCurveName = CurveName;
   mLin = InterpLin;
   mInterp = InterpMeth;

   if (InterpMeth >= nInterpolations)
   {
      InterpMeth -= nInterpolations;
   }

   mEnvelope = (mLin ? mLinEnvelope : mLogEnvelope).get();

   return true;
}

bool EffectEqualization::LoadFactoryDefaults()
{
   mdBMin = DEF_dBMin;
   mdBMax = DEF_dBMax;
   mDrawMode = DEF_DrawMode;
   mDrawGrid = DEF_DrawGrid;

   return Effect::LoadFactoryDefaults();
}

// EffectUIClientInterface implementation

bool EffectEqualization::ValidateUI()
{
   // If editing a macro, we don't want to be using the unnamed curve so
   // we offer to save it.

   if (mDisallowCustom && mCurveName.IsSameAs(wxT("unnamed")))
   {
      // PRL:  This is unreachable.  mDisallowCustom is always false.

      Effect::MessageBox(_("To use this EQ curve in a macro, please choose a new name for it.\nChoose the 'Save/Manage Curves...' button and rename the 'unnamed' curve, then use that one."),
         wxOK | wxCENTRE,
         _("EQ Curve needs a different name"));
      return false;
   }

   // Update unnamed curve (so it's there for next time)
   //(done in a hurry, may not be the neatest -MJS)
   if (mDirty && !mDrawMode)
   {
      size_t numPoints = mLogEnvelope->GetNumberOfPoints();
      Doubles when{ numPoints };
      Doubles value{ numPoints };
      mLogEnvelope->GetPoints(when.get(), value.get(), numPoints);
      for (size_t i = 0, j = 0; j + 2 < numPoints; i++, j++)
      {
         if ((value[i] < value[i + 1] + .05) && (value[i] > value[i + 1] - .05) &&
            (value[i + 1] < value[i + 2] + .05) && (value[i + 1] > value[i + 2] - .05))
         {   // within < 0.05 dB?
            mLogEnvelope->Delete(j + 1);
            numPoints--;
            j--;
         }
      }
      Select((int) mCurves.size() - 1);
   }
   SaveCurves();

   SetPrivateConfig(GetCurrentSettingsGroup(), wxT("dBMin"), mdBMin);
   SetPrivateConfig(GetCurrentSettingsGroup(), wxT("dBMax"), mdBMax);
   SetPrivateConfig(GetCurrentSettingsGroup(), wxT("DrawMode"), mDrawMode);
   SetPrivateConfig(GetCurrentSettingsGroup(), wxT("DrawGrid"), mDrawGrid);

   return true;
}

// Effect implementation

bool EffectEqualization::Startup()
{
   wxString base = wxT("/Effects/Equalization/");

   // Migrate settings from 2.1.0 or before

   // Already migrated, so bail
   if (gPrefs->Exists(base + wxT("Migrated")))
   {
      return true;
   }

   // Load the old "current" settings
   if (gPrefs->Exists(base))
   {
      // These get saved to the current preset
      int filterLength;
      gPrefs->Read(base + wxT("FilterLength"), &filterLength, 4001);
      mM = std::max(0, filterLength);
      if ((mM < 21) || (mM > 8191)) {  // corrupted Prefs?
         mM = 4001;  //default
      }
      gPrefs->Read(base + wxT("CurveName"), &mCurveName, wxT("unnamed"));
      gPrefs->Read(base + wxT("Lin"), &mLin, false);
      gPrefs->Read(base + wxT("Interp"), &mInterp, 0);

      SaveUserPreset(GetCurrentSettingsGroup());

      // These persist across preset changes
      double dBMin;
      gPrefs->Read(base + wxT("dBMin"), &dBMin, -30.0);
      if ((dBMin < -120) || (dBMin > -10)) {  // corrupted Prefs?
         dBMin = -30;  //default
      }
      mdBMin = dBMin;
      SetPrivateConfig(GetCurrentSettingsGroup(), wxT("dBMin"), mdBMin);

      double dBMax;
      gPrefs->Read(base + wxT("dBMax"), &dBMax, 30.);
      if ((dBMax < 0) || (dBMax > 60)) {  // corrupted Prefs?
         dBMax = 30;  //default
      }
      mdBMax = dBMax;
      SetPrivateConfig(GetCurrentSettingsGroup(), wxT("dBMax"), mdBMax);

      gPrefs->Read(base + wxT("DrawMode"), &mDrawMode, true);
      SetPrivateConfig(GetCurrentSettingsGroup(), wxT("DrawMode"), mDrawMode);

      gPrefs->Read(base + wxT("DrawGrid"), &mDrawGrid, true);
      SetPrivateConfig(GetCurrentSettingsGroup(), wxT("DrawGrid"), mDrawGrid);

      // Do not migrate again
      gPrefs->Write(base + wxT("Migrated"), true);
      gPrefs->Flush();
   }

   return true;
}

bool EffectEqualization::Init()
{
   int selcount = 0;
   double rate = 0.0;
   TrackListIterator iter(GetActiveProject()->GetTracks());
   Track *t = iter.First();
   while (t) {
      if (t->GetSelected() && t->GetKind() == Track::Wave) {
         WaveTrack *track = (WaveTrack *)t;
         if (selcount==0) {
            rate = track->GetRate();
         }
         else {
            if (track->GetRate() != rate) {
               Effect::MessageBox(_("To apply Equalization, all selected tracks must have the same sample rate."));
               return(false);
            }
         }
         selcount++;
      }
      t = iter.Next();
   }

   mHiFreq = rate / 2.0;
   // Unlikely, but better than crashing.
   if (mHiFreq <= loFreqI) {
      Effect::MessageBox( _("Track sample rate is too low for this effect."),
                    wxOK | wxCENTRE,
                    _("Effect Unavailable"));
      return(false);
   }

   mLoFreq = loFreqI;

   mBandsInUse = 0;
   while (kThirdOct[mBandsInUse] <= mHiFreq) {
      mBandsInUse++;
      if (mBandsInUse == NUMBER_OF_BANDS)
         break;
   }

   mEnvelope = (mLin ? mLinEnvelope : mLogEnvelope).get();

   setCurve(mCurveName);

   CalcFilter();

   return(true);
}

bool EffectEqualization::Process()
{
#ifdef EXPERIMENTAL_EQ_SSE_THREADED
   if(mEffectEqualization48x) {
      if(mBench) {
         mBench=false;
         return mEffectEqualization48x->Benchmark(this);
      }
      else
         return mEffectEqualization48x->Process(this);
   }
#endif
   this->CopyInputTracks(); // Set up mOutputTracks.
   bool bGoodResult = true;

   SelectedTrackListOfKindIterator iter(Track::Wave, mOutputTracks.get());
   WaveTrack *track = (WaveTrack *) iter.First();
   int count = 0;
   while (track) {
      double trackStart = track->GetStartTime();
      double trackEnd = track->GetEndTime();
      double t0 = mT0 < trackStart? trackStart: mT0;
      double t1 = mT1 > trackEnd? trackEnd: mT1;

      if (t1 > t0) {
         auto start = track->TimeToLongSamples(t0);
         auto end = track->TimeToLongSamples(t1);
         auto len = end - start;

         if (!ProcessOne(count, track, start, len))
         {
            bGoodResult = false;
            break;
         }
      }

      track = (WaveTrack *) iter.Next();
      count++;
   }

   this->ReplaceProcessedTracks(bGoodResult);
   return bGoodResult;
}

bool EffectEqualization::PopulateUI(wxWindow *parent)
{
   mUIParent = parent;
   mUIParent->PushEventHandler(this);

   LoadUserPreset(GetCurrentSettingsGroup());

   ShuttleGui S(mUIParent, eIsCreating);
   PopulateOrExchange(S);

   return true;
}

bool EffectEqualization::CloseUI()
{
   mCurve = NULL;
   mPanel = NULL;

   return Effect::CloseUI();
}

void EffectEqualization::PopulateOrExchange(ShuttleGui & S)
{
   wxWindow *const parent = S.GetParent();

   LoadCurves();

   TrackListOfKindIterator iter(Track::Wave, inputTracks());
   WaveTrack *t = (WaveTrack *) iter.First();
   mHiFreq = (t ? t->GetRate() : GetActiveProject()->GetRate()) / 2.0;
   mLoFreq = loFreqI;

   S.SetBorder(0);

   S.SetSizerProportion(1);
   S.StartMultiColumn(1, wxEXPAND);
   {
      S.SetStretchyCol(0);
      S.SetStretchyRow(1);
      szrV = S.GetSizer();

      // -------------------------------------------------------------------
      // ROW 1: Top border
      // -------------------------------------------------------------------
      S.AddSpace(5);

      S.SetSizerProportion(1);
      S.StartMultiColumn(3, wxEXPAND);
      {
         S.SetStretchyCol(1);
         S.SetStretchyRow(0);
         szr1 = S.GetSizer();

         // -------------------------------------------------------------------
         // ROW 2: Equalization panel and sliders for vertical scale
         // -------------------------------------------------------------------
         S.StartVerticalLay();
         {
            mdBRuler = safenew RulerPanel(
               parent, wxID_ANY, wxVERTICAL,
               wxSize{ 100, 100 }, // Ruler can't handle small sizes
               RulerPanel::Range{ 60.0, -120.0 },
               Ruler::LinearDBFormat,
               _("dB"),
               RulerPanel::Options{}
                  .LabelEdges(true)
                  .TicksAtExtremes(true)
                  .TickColour( { 0, 0, 0 } )
            );

            S.AddSpace(0, 1);
            S.Prop(1).AddWindow(mdBRuler, wxEXPAND );
            S.AddSpace(0, 1);
         }
         S.EndVerticalLay();

         mPanel = safenew EqualizationPanel(parent, wxID_ANY, this);
         S.Prop(1);
         S.AddWindow(mPanel, wxEXPAND );
         S.SetSizeHints(wxDefaultCoord, wxDefaultCoord);

         S.SetBorder(5);
         S.StartVerticalLay();
         {
            S.AddVariableText(_("+ dB"), false, wxCENTER);
            S.SetStyle(wxSL_VERTICAL | wxSL_INVERSE);
            mdBMaxSlider = S.Id(ID_dBMax).AddSlider( {}, 30, 60, 0);
#if wxUSE_ACCESSIBILITY
            mdBMaxSlider->SetName(_("Max dB"));
            mdBMaxSlider->SetAccessible(safenew SliderAx(mdBMaxSlider, _("%d dB")));
#endif

            S.SetStyle(wxSL_VERTICAL | wxSL_INVERSE);
            mdBMinSlider = S.Id(ID_dBMin).AddSlider( {}, -30, -10, -120);
            S.AddVariableText(_("- dB"), false, wxCENTER);
#if wxUSE_ACCESSIBILITY
            mdBMinSlider->SetName(_("Min dB"));
            mdBMinSlider->SetAccessible(safenew SliderAx(mdBMinSlider, _("%d dB")));
#endif
         }
         S.EndVerticalLay();
         S.SetBorder(0);

         // -------------------------------------------------------------------
         // ROW 3: Frequency ruler
         // -------------------------------------------------------------------

         // Column 1 is empty
         S.AddSpace(1, 1);

         mFreqRuler  = safenew RulerPanel(
            parent, wxID_ANY, wxHORIZONTAL,
            wxSize{ 100, 100 }, // Ruler can't handle small sizes
            RulerPanel::Range{ mLoFreq, mHiFreq },
            Ruler::IntFormat,
            _("Hz"),
            RulerPanel::Options{}
               .Log(true)
               .Flip(true)
               .LabelEdges(true)
               .TicksAtExtremes(true)
               .TickColour( { 0, 0, 0 } )
         );

         S.SetBorder(1);
         S.Prop(1).AddWindow(mFreqRuler, wxEXPAND | wxALIGN_LEFT | wxALIGN_TOP | wxLEFT);
         S.SetBorder(0);

         // Column 3 is empty
         S.AddSpace(1, 1);
      }
      S.EndMultiColumn();

      // -------------------------------------------------------------------
      // ROW 3: Graphic EQ - this gets laid out horizontally in onSize
      // -------------------------------------------------------------------
      S.StartHorizontalLay(wxEXPAND, 0);
      {
         szrG = S.GetSizer();

         // Panel used to host the sliders since they will be positioned manually.
         mGraphicPanel = safenew wxPanelWrapper(parent, wxID_ANY, wxDefaultPosition, wxSize(-1, 150));
         S.Prop(1).AddWindow(mGraphicPanel, wxEXPAND);

         for (int i = 0; (i < NUMBER_OF_BANDS) && (kThirdOct[i] <= mHiFreq); ++i)
         {
            mSliders[i] = safenew wxSlider(mGraphicPanel, ID_Slider + i, 0, -20, +20,
               wxDefaultPosition, wxDefaultSize, wxSL_VERTICAL | wxSL_INVERSE);

            mSliders[i]->Bind(wxEVT_ERASE_BACKGROUND,
                              // ignore it
                              [](wxEvent&){});
#if wxUSE_ACCESSIBILITY
            wxString name;
            if( kThirdOct[i] < 1000.)
               name.Printf(_("%d Hz"), (int)kThirdOct[i]);
            else
               name.Printf(_("%g kHz"), kThirdOct[i]/1000.);
            mSliders[i]->SetName(name);
            mSliders[i]->SetAccessible(safenew SliderAx(mSliders[i], _("%d dB")));
#endif
            mSlidersOld[i] = 0;
            mEQVals[i] = 0.;
         }
      }
      S.EndHorizontalLay();

      S.StartMultiColumn(7, wxALIGN_CENTER_HORIZONTAL);
      {
         S.SetBorder(5);

         // -------------------------------------------------------------------
         // ROWS 4:
         // -------------------------------------------------------------------

         S.AddSpace(5, 5);

         S.StartHorizontalLay(wxALIGN_RIGHT | wxALIGN_CENTER_VERTICAL);
         {
            S.AddPrompt(_("&EQ Type:"));
         }
         S.EndHorizontalLay();

         S.StartHorizontalLay(wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL, 1);
         {
            S.StartHorizontalLay(wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL, 1);
            {
               mDraw = S.Id(ID_Draw).AddRadioButton(_("&Draw"));
               mDraw->SetName(_("Draw Curves"));

               mGraphic = S.Id(ID_Graphic).AddRadioButtonToGroup(_("&Graphic"));
               mGraphic->SetName(_("Graphic EQ"));
            }
            S.EndHorizontalLay();
         }
         S.EndHorizontalLay();

         S.StartHorizontalLay(wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL, 1);
         {
            szrH = S.GetSizer();

            S.StartHorizontalLay(wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL, 1);
            {
               szrI = S.GetSizer();

               auto interpolations =
                  LocalizedStrings(kInterpStrings, nInterpolations);
               mInterpChoice = S.Id(ID_Interp).AddChoice( {}, wxT(""), &interpolations);
               mInterpChoice->SetName(_("Interpolation type"));
               mInterpChoice->SetSelection(0);
            }
            S.EndHorizontalLay();

            S.StartHorizontalLay(wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL, 1);
            {
               szrL = S.GetSizer();

               mLinFreq = S.Id(ID_Linear).AddCheckBox(_("Li&near Frequency Scale"), wxT("false"));
               mLinFreq->SetName(_("Linear Frequency Scale"));
            }
            S.EndHorizontalLay();
         }
         S.EndHorizontalLay();

         // -------------------------------------------------------------------
         // Filter length grouping
         // -------------------------------------------------------------------

         S.StartHorizontalLay(wxEXPAND, 1);
         {
            S.StartHorizontalLay(wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL, 0);
            {
               S.AddPrompt(_("Length of &Filter:"));
            }
            S.EndHorizontalLay();

            S.StartHorizontalLay(wxEXPAND, 1);
            {
               S.SetStyle(wxSL_HORIZONTAL);
               mMSlider = S.Id(ID_Length).AddSlider( {}, (mM - 1) / 2, 4095, 10);
               mMSlider->SetName(_("Length of Filter"));
            }
            S.EndHorizontalLay();

            S.StartHorizontalLay(wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL, 0);
            {
               wxString label;
               label.Printf(wxT("%ld"), mM);
               mMText = S.AddVariableText(label);
               mMText->SetName(label); // fix for bug 577 (NVDA/Narrator screen readers do not read static text in dialogs)
            }
            S.EndHorizontalLay();
         }
         S.EndHorizontalLay();

         S.AddSpace(1, 1);

         S.AddSpace(5, 5);

         // -------------------------------------------------------------------
         // ROW 5:
         // -------------------------------------------------------------------

         S.AddSpace(5, 5);

         S.StartHorizontalLay(wxALIGN_RIGHT | wxALIGN_CENTER_VERTICAL);
         {
            S.AddPrompt(_("&Select Curve:"));
         }
         S.EndHorizontalLay();

         S.StartHorizontalLay(wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL, 1);
         {
            S.StartHorizontalLay(wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL, 1);
            {
               wxArrayString curves;
               for (size_t i = 0, cnt = mCurves.size(); i < cnt; i++)
               {
                  curves.Add(mCurves[ i ].Name);
               }

               mCurve = S.Id(ID_Curve).AddChoice( {}, wxT(""), &curves);
               mCurve->SetName(_("Select Curve"));
            }
            S.EndHorizontalLay();
         }
         S.EndHorizontalLay();
         S.Id(ID_Manage).AddButton(_("S&ave/Manage Curves..."));

         S.StartHorizontalLay(wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL, 1);
         {
            S.Id(ID_Clear).AddButton(_("Fla&tten"));
            S.Id(ID_Invert).AddButton(_("&Invert"));

            mGridOnOff = S.Id(ID_Grid).AddCheckBox(_("Show g&rid lines"), wxT("false"));
            mGridOnOff->SetName(_("Show grid lines"));
         }
         S.EndHorizontalLay();

         S.AddSpace(5, 5);
      }
      S.EndMultiColumn();
   }
   S.EndMultiColumn();

#ifdef EXPERIMENTAL_EQ_SSE_THREADED
   if (mEffectEqualization48x)
   {
      // -------------------------------------------------------------------
      // ROW 6: Processing routine selection
      // -------------------------------------------------------------------

      // Column 1 is blank
      S.AddSpace(1, 1);

      S.StartHorizontalLay();
      {
         S.AddUnits(_("&Processing: "));

         mMathProcessingType[0] = S.Id(ID_DefaultMath).
            AddRadioButton(_("D&efault"));
         mMathProcessingType[1] = S.Id(ID_SSE).
            AddRadioButtonToGroup(_("&SSE"));
         mMathProcessingType[2] = S.Id(ID_SSEThreaded).
            AddRadioButtonToGroup(_("SSE &Threaded"));
         mMathProcessingType[3] = S.Id(ID_AVX).
            AddRadioButtonToGroup(_("A&VX"));
         mMathProcessingType[4] = S.Id(ID_AVXThreaded).
            AddRadioButtonToGroup(_("AV&X Threaded"));

         if (!EffectEqualization48x::GetMathCaps()->SSE)
         {
            mMathProcessingType[1]->Disable();
            mMathProcessingType[2]->Disable();
         }
         if (true)  
         {
            mMathProcessingType[3]->Disable();
            mMathProcessingType[4]->Disable();
         }
         // update the control state
         mMathProcessingType[0]->SetValue(true);
         int mathPath=EffectEqualization48x::GetMathPath();
         if (mathPath&MATH_FUNCTION_SSE)
         {
            mMathProcessingType[1]->SetValue(true);
            if (mathPath&MATH_FUNCTION_THREADED)
               mMathProcessingType[2]->SetValue(true);
         }
         if (false) //mathPath&MATH_FUNCTION_AVX) { not implemented
         {
            mMathProcessingType[3]->SetValue(true);
            if (mathPath&MATH_FUNCTION_THREADED)
               mMathProcessingType[4]->SetValue(true);
         }
         S.Id(ID_Bench).AddButton(_("&Bench"));
      }
      S.EndHorizontalLay();

      // Column 3 is blank
      S.AddSpace(1, 1);
   }
#endif

   mUIParent->SetAutoLayout(false);
   mUIParent->Layout();

   // "show" settings for graphics mode before setting the size of the dialog
   // as this needs more space than draw mode
   szrV->Show(szrG,true);  // eq sliders
   szrH->Show(szrI,true);  // interpolation choice
   szrH->Show(szrL,false); // linear freq checkbox

   mUIParent->SetSizeHints(mUIParent->GetBestSize());

//   szrL->SetMinSize( szrI->GetSize() );

   return;
}

//
// Populate the window with relevant variables
//
bool EffectEqualization::TransferDataToWindow()
{
   // Set log or lin freq scale (affects interpolation as well)
   mLinFreq->SetValue( mLin );
   wxCommandEvent dummyEvent;
   OnLinFreq(dummyEvent);  // causes a CalcFilter

   mGridOnOff->SetValue( mDrawGrid ); // checks/unchecks the box on the interface

   mMSlider->SetValue((mM - 1) / 2);
   mM = 0;                        // force refresh in TransferDataFromWindow()

   mdBMinSlider->SetValue((int)mdBMin);
   mdBMin = 0;                     // force refresh in TransferDataFromWindow()

   mdBMaxSlider->SetValue((int)mdBMax);
   mdBMax = 0;                    // force refresh in TransferDataFromWindow()

   // Reload the curve names
   UpdateCurves();

   // Set graphic interpolation mode
   mInterpChoice->SetSelection(mInterp);

   // Set Graphic (Fader) or Draw mode
   if (mDrawMode)
   {
      mDraw->SetValue(true);
      szrV->Show(szrG,false);    // eq sliders
      szrH->Show(szrI,false);    // interpolation choice
      szrH->Show(szrL,true);     // linear freq checkbox
   }
   else
   {
      mGraphic->SetValue(true);
      UpdateGraphic();
   }

   TransferDataFromWindow();

   mUIParent->Layout();
   wxGetTopLevelParent(mUIParent)->Layout();

   return true;
}

//
// Retrieve data from the window
//
bool EffectEqualization::TransferDataFromWindow()
{
   wxString tip;

   bool rr = false;
   float dB = (float) mdBMinSlider->GetValue();
   if (dB != mdBMin) {
      rr = true;
      mdBMin = dB;
      tip.Printf(_("%d dB"), (int)mdBMin);
      mdBMinSlider->SetToolTip(tip);
   }

   dB = (float) mdBMaxSlider->GetValue();
   if (dB != mdBMax) {
      rr = true;
      mdBMax = dB;
      tip.Printf(_("%d dB"), (int)mdBMax);
      mdBMaxSlider->SetToolTip(tip);
   }

   // Refresh ruler if values have changed
   if (rr) {
      int w1, w2, h;
      mdBRuler->ruler.GetMaxSize(&w1, &h);
      mdBRuler->ruler.SetRange(mdBMax, mdBMin);
      mdBRuler->ruler.GetMaxSize(&w2, &h);
      if( w1 != w2 )   // Reduces flicker
      {
         mdBRuler->SetSize(wxSize(w2,h));
         LayoutEQSliders();
         mFreqRuler->Refresh(false);
      }
      mdBRuler->Refresh(false);

      mPanel->Refresh(false);
   }

   size_t m = 2 * mMSlider->GetValue() + 1;   // odd numbers only
   if (m != mM) {
      mM = m;
      ForceRecalc();

      tip.Printf(wxT("%d"), (int)mM);
      mMText->SetLabel(tip);
      mMText->SetName(mMText->GetLabel()); // fix for bug 577 (NVDA/Narrator screen readers do not read static text in dialogs)
      mMSlider->SetToolTip(tip);
   }

   return true;
}

// EffectEqualization implementation

bool EffectEqualization::ProcessOne(int count, WaveTrack * t,
                                    sampleCount start, sampleCount len)
{
   // create a NEW WaveTrack to hold all of the output, including 'tails' each end
   AudacityProject *p = GetActiveProject();
   auto output = p->GetTrackFactory()->NewWaveTrack(floatSample, t->GetRate());

   wxASSERT(mM - 1 < windowSize);
   size_t L = windowSize - (mM - 1);   //Process L samples at a go
   auto s = start;
   auto idealBlockLen = t->GetMaxBlockSize() * 4;
   if (idealBlockLen % L != 0)
      idealBlockLen += (L - (idealBlockLen % L));

   Floats buffer{ idealBlockLen };

   Floats window1{ windowSize };
   Floats window2{ windowSize };
   float *thisWindow = window1.get();
   float *lastWindow = window2.get();

   auto originalLen = len;

   for(size_t i = 0; i < windowSize; i++)
      lastWindow[i] = 0;

   TrackProgress(count, 0.);
   bool bLoopSuccess = true;
   size_t wcopy = 0;
   int offset = (mM - 1) / 2;

   while (len != 0)
   {
      auto block = limitSampleBufferSize( idealBlockLen, len );

      t->Get((samplePtr)buffer.get(), floatSample, s, block);

      for(size_t i = 0; i < block; i += L)   //go through block in lumps of length L
      {
         wcopy = std::min <size_t> (L, block - i);
         for(size_t j = 0; j < wcopy; j++)
            thisWindow[j] = buffer[i+j];   //copy the L (or remaining) samples
         for(auto j = wcopy; j < windowSize; j++)
            thisWindow[j] = 0;   //this includes the padding

         Filter(windowSize, thisWindow);

         // Overlap - Add
         for(size_t j = 0; (j < mM - 1) && (j < wcopy); j++)
            buffer[i+j] = thisWindow[j] + lastWindow[L + j];
         for(size_t j = mM - 1; j < wcopy; j++)
            buffer[i+j] = thisWindow[j];

         std::swap( thisWindow, lastWindow );
      }  //next i, lump of this block

      output->Append((samplePtr)buffer.get(), floatSample, block);
      len -= block;
      s += block;

      if (TrackProgress(count, ( s - start ).as_double() /
                        originalLen.as_double()))
      {
         bLoopSuccess = false;
         break;
      }
   }

   if(bLoopSuccess)
   {
      // mM-1 samples of 'tail' left in lastWindow, get them now
      if(wcopy < (mM - 1)) {
         // Still have some overlap left to process
         // (note that lastWindow and thisWindow have been exchanged at this point
         //  so that 'thisWindow' is really the window prior to 'lastWindow')
         size_t j = 0;
         for(; j < mM - 1 - wcopy; j++)
            buffer[j] = lastWindow[wcopy + j] + thisWindow[L + wcopy + j];
         // And fill in the remainder after the overlap
         for( ; j < mM - 1; j++)
            buffer[j] = lastWindow[wcopy + j];
      } else {
         for(size_t j = 0; j < mM - 1; j++)
            buffer[j] = lastWindow[wcopy + j];
      }
      output->Append((samplePtr)buffer.get(), floatSample, mM - 1);
      output->Flush();

      // now move the appropriate bit of the output back to the track
      // (this could be enhanced in the future to use the tails)
      double offsetT0 = t->LongSamplesToTime(offset);
      double lenT = t->LongSamplesToTime(originalLen);
      // 'start' is the sample offset in 't', the passed in track
      // 'startT' is the equivalent time value
      // 'output' starts at zero
      double startT = t->LongSamplesToTime(start);

      //output has one waveclip for the total length, even though
      //t might have whitespace seperating multiple clips
      //we want to maintain the original clip structure, so
      //only paste the intersections of the NEW clip.

      //Find the bits of clips that need replacing
      std::vector<std::pair<double, double> > clipStartEndTimes;
      std::vector<std::pair<double, double> > clipRealStartEndTimes; //the above may be truncated due to a clip being partially selected
      for (const auto &clip : t->GetClips())
      {
         double clipStartT;
         double clipEndT;

         clipStartT = clip->GetStartTime();
         clipEndT = clip->GetEndTime();
         if( clipEndT <= startT )
            continue;   // clip is not within selection
         if( clipStartT >= startT + lenT )
            continue;   // clip is not within selection

         //save the actual clip start/end so that we can rejoin them after we paste.
         clipRealStartEndTimes.push_back(std::pair<double,double>(clipStartT,clipEndT));

         if( clipStartT < startT )  // does selection cover the whole clip?
            clipStartT = startT; // don't copy all the NEW clip
         if( clipEndT > startT + lenT )  // does selection cover the whole clip?
            clipEndT = startT + lenT; // don't copy all the NEW clip

         //save them
         clipStartEndTimes.push_back(std::pair<double,double>(clipStartT,clipEndT));
      }
      //now go thru and replace the old clips with NEW
      for(unsigned int i = 0; i < clipStartEndTimes.size(); i++)
      {
         //remove the old audio and get the NEW
         t->Clear(clipStartEndTimes[i].first,clipStartEndTimes[i].second);
         auto toClipOutput = output->Copy(clipStartEndTimes[i].first-startT+offsetT0,clipStartEndTimes[i].second-startT+offsetT0);
         //put the processed audio in
         t->Paste(clipStartEndTimes[i].first, toClipOutput.get());
         //if the clip was only partially selected, the Paste will have created a split line.  Join is needed to take care of this
         //This is not true when the selection is fully contained within one clip (second half of conditional)
         if( (clipRealStartEndTimes[i].first  != clipStartEndTimes[i].first ||
            clipRealStartEndTimes[i].second != clipStartEndTimes[i].second) &&
            !(clipRealStartEndTimes[i].first <= startT &&
            clipRealStartEndTimes[i].second >= startT+lenT) )
            t->Join(clipRealStartEndTimes[i].first,clipRealStartEndTimes[i].second);
      }
   }

   return bLoopSuccess;
}

bool EffectEqualization::CalcFilter()
{
   double loLog = log10(mLoFreq);
   double hiLog = log10(mHiFreq);
   double denom = hiLog - loLog;

   double delta = mHiFreq / ((double)(mWindowSize / 2.));
   double val0;
   double val1;

   if( IsLinear() )
   {
      val0 = mLinEnvelope->GetValue(0.0);   //no scaling required - saved as dB
      val1 = mLinEnvelope->GetValue(1.0);
   }
   else
   {
      val0 = mLogEnvelope->GetValue(0.0);   //no scaling required - saved as dB
      val1 = mLogEnvelope->GetValue(1.0);
   }
   mFilterFuncR[0] = val0;
   double freq = delta;

   for(size_t i = 1; i <= mWindowSize / 2; i++)
   {
      double when;
      if( IsLinear() )
         when = freq/mHiFreq;
      else
         when = (log10(freq) - loLog)/denom;
      if(when < 0.)
      {
         mFilterFuncR[i] = val0;
      }
      else  if(when > 1.0)
      {
         mFilterFuncR[i] = val1;
      }
      else
      {
         if( IsLinear() )
            mFilterFuncR[i] = mLinEnvelope->GetValue(when);
         else
            mFilterFuncR[i] = mLogEnvelope->GetValue(when);
      }
      freq += delta;
   }
   mFilterFuncR[mWindowSize / 2] = val1;

   mFilterFuncR[0] = DB_TO_LINEAR(mFilterFuncR[0]);

   {
      size_t i = 1;
      for(; i < mWindowSize / 2; i++)
      {
         mFilterFuncR[i] = DB_TO_LINEAR(mFilterFuncR[i]);
         mFilterFuncR[mWindowSize - i] = mFilterFuncR[i];   //Fill entire array
      }
      mFilterFuncR[i] = DB_TO_LINEAR(mFilterFuncR[i]);   //do last one
   }

   //transfer to time domain to do the padding and windowing
   Floats outr{ mWindowSize };
   Floats outi{ mWindowSize };
   InverseRealFFT(mWindowSize, mFilterFuncR.get(), NULL, outr.get()); // To time domain

   {
      size_t i = 0;
      for(; i <= (mM - 1) / 2; i++)
      {  //Windowing - could give a choice, fixed for now - MJS
         //      double mult=0.54-0.46*cos(2*M_PI*(i+(mM-1)/2.0)/(mM-1));   //Hamming
         //Blackman
         double mult =
            0.42 -
            0.5 * cos(2 * M_PI * (i + (mM - 1) / 2.0) / (mM - 1)) +
            .08 * cos(4 * M_PI * (i + (mM - 1) / 2.0) / (mM - 1));
         outr[i] *= mult;
         if(i != 0){
            outr[mWindowSize - i] *= mult;
         }
      }
      for(; i <= mWindowSize / 2; i++)
      {   //Padding
         outr[i] = 0;
         outr[mWindowSize - i] = 0;
      }
   }
   Floats tempr{ mM };
   {
      size_t i = 0;
      for(; i < (mM - 1) / 2; i++)
      {   //shift so that padding on right
         tempr[(mM - 1) / 2 + i] = outr[i];
         tempr[i] = outr[mWindowSize - (mM - 1) / 2 + i];
      }
      tempr[(mM - 1) / 2 + i] = outr[i];
   }

   for (size_t i = 0; i < mM; i++)
   {   //and copy useful values back
      outr[i] = tempr[i];
   }
   for (size_t i = mM; i < mWindowSize; i++)
   {   //rest is padding
      outr[i]=0.;
   }

   //Back to the frequency domain so we can use it
   RealFFT(mWindowSize, outr.get(), mFilterFuncR.get(), mFilterFuncI.get());

   return TRUE;
}

void EffectEqualization::Filter(size_t len, float *buffer)
{
   float re,im;
   // Apply FFT
   RealFFTf(buffer, hFFT.get());
   //FFT(len, false, inr, NULL, outr, outi);

   // Apply filter
   // DC component is purely real
   mFFTBuffer[0] = buffer[0] * mFilterFuncR[0];
   for(size_t i = 1; i < (len / 2); i++)
   {
      re=buffer[hFFT->BitReversed[i]  ];
      im=buffer[hFFT->BitReversed[i]+1];
      mFFTBuffer[2*i  ] = re*mFilterFuncR[i] - im*mFilterFuncI[i];
      mFFTBuffer[2*i+1] = re*mFilterFuncI[i] + im*mFilterFuncR[i];
   }
   // Fs/2 component is purely real
   mFFTBuffer[1] = buffer[1] * mFilterFuncR[len/2];

   // Inverse FFT and normalization
   InverseRealFFTf(mFFTBuffer.get(), hFFT.get());
   ReorderToTime(hFFT.get(), mFFTBuffer.get(), buffer);
}

//
// Load external curves with fallback to default, then message
//
void EffectEqualization::LoadCurves(const wxString &fileName, bool append)
{
   // Construct normal curve filename
   //
   // LLL:  Wouldn't you know that as of WX 2.6.2, there is a conflict
   //       between wxStandardPaths and wxConfig under Linux.  The latter
   //       creates a normal file as "$HOME/.audacity", while the former
   //       expects the ".audacity" portion to be a directory.
   // MJS:  I don't know what the above means, or if I have broken it.
   wxFileName fn;

   if(fileName == wxT("")) {
      // Check if presets are up to date.
      wxString eqCurvesCurrentVersion = wxString::Format(wxT("%d.%d"), EQCURVES_VERSION, EQCURVES_REVISION);
      wxString eqCurvesInstalledVersion = wxT("");
      gPrefs->Read(wxT("/Effects/Equalization/PresetVersion"), &eqCurvesInstalledVersion, wxT(""));

      bool needUpdate = (eqCurvesCurrentVersion != eqCurvesInstalledVersion);

      // UpdateDefaultCurves allows us to import NEW factory presets only,
      // or update all factory preset curves.
      if (needUpdate)
         UpdateDefaultCurves( UPDATE_ALL != 0 );
      fn = wxFileName( FileNames::DataDir(), wxT("EQCurves.xml") );
   }
   else
      fn = fileName; // user is loading a specific set of curves

   // If requested file doesn't exist...
   if( !fn.FileExists() && !GetDefaultFileName(fn) ) {
      mCurves.clear();
      mCurves.push_back( _("unnamed") );   // we still need a default curve to use
      return;
   }

   EQCurve tempCustom(wxT("temp"));
   if( append == false ) // Start from scratch
      mCurves.clear();
   else  // appending so copy and remove 'unnamed', to replace later
   {
      tempCustom.points = mCurves.back().points;
      mCurves.pop_back();
   }

   // Load the curves
   XMLFileReader reader;
   const wxString fullPath{ fn.GetFullPath() };
   if( !reader.Parse( this, fullPath ) )
   {
      wxString msg;
      /* i18n-hint: EQ stands for 'Equalization'.*/
      msg.Printf(_("Error Loading EQ Curves from file:\n%s\nError message says:\n%s"), fullPath, reader.GetErrorStr());
      // Inform user of load failure
      Effect::MessageBox( msg,
         wxOK | wxCENTRE,
         _("Error Loading EQ Curves"));
      mCurves.push_back( _("unnamed") );  // we always need a default curve to use
      return;
   }

   // Move "unnamed" to end, if it exists in current language.
   int numCurves = mCurves.size();
   int curve;
   EQCurve tempUnnamed(wxT("tempUnnamed"));
   for( curve = 0; curve < numCurves-1; curve++ )
   {
      if( mCurves[curve].Name == _("unnamed") )
      {
         tempUnnamed.points = mCurves[curve].points;
         mCurves.erase(mCurves.begin() + curve);
         mCurves.push_back( _("unnamed") );   // add 'unnamed' back at the end
         mCurves.back().points = tempUnnamed.points;
      }
   }

   if( mCurves.back().Name != _("unnamed") )
      mCurves.push_back( _("unnamed") );   // we always need a default curve to use
   if( append == true )
   {
      mCurves.back().points = tempCustom.points;
   }

   return;
}

//
// Update presets to match Audacity version.
//
void EffectEqualization::UpdateDefaultCurves(bool updateAll /* false */)
{
   if (mCurves.size() == 0)
      return;

   /* i18n-hint: name of the 'unnamed' custom curve */
   wxString unnamed = _("unnamed");

   // Save the "unnamed" curve and remove it so we can add it back as the final curve.
   EQCurve userUnnamed(wxT("temp"));
   userUnnamed = mCurves.back();
   mCurves.pop_back();

   EQCurveArray userCurves = mCurves;
   mCurves.clear();
   // We only wamt to look for the shipped EQDefaultCurves.xml
   wxFileName fn = wxFileName(FileNames::ResourcesDir(), wxT("EQDefaultCurves.xml"));
   wxLogDebug(wxT("Attempting to load EQDefaultCurves.xml from %s"),fn.GetFullPath());
   XMLFileReader reader;

   if(!reader.Parse(this, fn.GetFullPath())) {
      wxLogError(wxT("EQDefaultCurves.xml could not be read."));
      return;
   }
   else {
      wxLogDebug(wxT("Loading EQDefaultCurves.xml successful."));
   }

   EQCurveArray defaultCurves = mCurves;
   mCurves.clear(); // clear now so that we can sort then add back.

   // Remove "unnamed" if it exists.
   if (defaultCurves.back().Name == unnamed) {
      defaultCurves.pop_back();
   }
   else {
      wxLogError(wxT("Error in EQDefaultCurves.xml"));
   }

   int numUserCurves = userCurves.size();
   int numDefaultCurves = defaultCurves.size();
   EQCurve tempCurve(wxT("test"));

   if (updateAll) {
      // Update all factory preset curves.
      // Sort and add factory defaults first;
      mCurves = defaultCurves;
      std::sort(mCurves.begin(), mCurves.end());
      // then add remaining user curves:
      for (int curveCount = 0; curveCount < numUserCurves; curveCount++) {
         bool isCustom = true;
         tempCurve = userCurves[curveCount];
         // is the name in the dfault set?
         for (int defCurveCount = 0; defCurveCount < numDefaultCurves; defCurveCount++) {
            if (tempCurve.Name == mCurves[defCurveCount].Name) {
               isCustom = false;
               break;
            }
         }
         // if tempCurve is not in the default set, add it to mCurves.
         if (isCustom) {
            mCurves.push_back(tempCurve);
         }
      }
   }
   else {
      // Import NEW factory defaults but retain all user modified curves.
      for (int defCurveCount = 0; defCurveCount < numDefaultCurves; defCurveCount++) {
         bool isUserCurve = false;
         // Add if the curve is in the user's set (preserve user's copy)
         for (int userCurveCount = 0; userCurveCount < numUserCurves; userCurveCount++) {
            if (userCurves[userCurveCount].Name == defaultCurves[defCurveCount].Name) {
               isUserCurve = true;
               mCurves.push_back(userCurves[userCurveCount]);
               break;
            }
         }
         if (!isUserCurve) {
            mCurves.push_back(defaultCurves[defCurveCount]);
         }
      }
      std::sort(mCurves.begin(), mCurves.end());
      // now add the rest of the user's curves.
      for (int userCurveCount = 0; userCurveCount < numUserCurves; userCurveCount++) {
         bool isDefaultCurve = false;
         tempCurve = userCurves[userCurveCount];
         for (int defCurveCount = 0; defCurveCount < numDefaultCurves; defCurveCount++) {
            if (tempCurve.Name == defaultCurves[defCurveCount].Name) {
               isDefaultCurve = true;
               break;
            }
         }
         if (!isDefaultCurve) {
            mCurves.push_back(tempCurve);
         }
      }
   }
   defaultCurves.clear();
   userCurves.clear();

   // Add back old "unnamed"
   if(userUnnamed.Name == unnamed) {
      mCurves.push_back( userUnnamed );   // we always need a default curve to use
   }

   SaveCurves();

   // Write current EqCurve version number
   // TODO: Probably better if we used pluginregistry.cfg
   wxString eqCurvesCurrentVersion = wxString::Format(wxT("%d.%d"), EQCURVES_VERSION, EQCURVES_REVISION);
   gPrefs->Write(wxT("/Effects/Equalization/PresetVersion"), eqCurvesCurrentVersion);
   gPrefs->Flush();

   return;
}

//
// Get fully qualified filename of EQDefaultCurves.xml
//
bool EffectEqualization::GetDefaultFileName(wxFileName &fileName)
{
   // look in data dir first, in case the user has their own defaults (maybe downloaded ones)
   fileName = wxFileName( FileNames::DataDir(), wxT("EQDefaultCurves.xml") );
   if( !fileName.FileExists() )
   {  // Default file not found in the data dir.  Fall back to Resources dir.
      // See http://docs.wxwidgets.org/trunk/classwx_standard_paths.html#5514bf6288ee9f5a0acaf065762ad95d
      fileName = wxFileName( FileNames::ResourcesDir(), wxT("EQDefaultCurves.xml") );
   }
   if( !fileName.FileExists() )
   {
      // LLL:  Is there really a need for an error message at all???
      //wxString errorMessage;
      //errorMessage.Printf(_("EQCurves.xml and EQDefaultCurves.xml were not found on your system.\nPlease press 'help' to visit the download page.\n\nSave the curves at %s"), FileNames::DataDir());
      //ShowErrorDialog(mUIParent, _("EQCurves.xml and EQDefaultCurves.xml missing"),
      //   errorMessage, wxT("http://wiki.audacityteam.org/wiki/EQCurvesDownload"), false);

      // Have another go at finding EQCurves.xml in the data dir, in case 'help' helped
      fileName = wxFileName( FileNames::DataDir(), wxT("EQDefaultCurves.xml") );
   }
   return (fileName.FileExists());
}


//
// Save curves to external file
//
void EffectEqualization::SaveCurves(const wxString &fileName)
{
   wxFileName fn;
   if( fileName == wxT(""))
   {
      // Construct default curve filename
      //
      // LLL:  Wouldn't you know that as of WX 2.6.2, there is a conflict
      //       between wxStandardPaths and wxConfig under Linux.  The latter
      //       creates a normal file as "$HOME/.audacity", while the former
      //       expects the ".audacity" portion to be a directory.
      fn = wxFileName( FileNames::DataDir(), wxT("EQCurves.xml") );

      // If the directory doesn't exist...
      if( !fn.DirExists() )
      {
         // Attempt to create it
         if( !fn.Mkdir( fn.GetPath(), 511, wxPATH_MKDIR_FULL ) )
         {
            // MkDir() will emit message
            return;
         }
      }
   }
   else
      fn = fileName;

   GuardedCall( [&] {
      // Create/Open the file
      const wxString fullPath{ fn.GetFullPath() };
      XMLFileWriter eqFile{ fullPath, _("Error Saving Equalization Curves") };

      // Write the curves
      WriteXML( eqFile );

      eqFile.Commit();
   } );
}

//
// Make the passed curve index the active one
//
void EffectEqualization::setCurve(int currentCurve)
{
   // Set current choice
   wxASSERT( currentCurve < (int) mCurves.size() );
   Select(currentCurve);

   Envelope *env;
   int numPoints = (int) mCurves[currentCurve].points.size();

   if (mLin) {  // linear freq mode
      env = mLinEnvelope.get();
   }
   else { // log freq mode
      env = mLogEnvelope.get();
   }
   env->Flatten(0.);
   env->SetTrackLen(1.0);

   // Handle special case of no points.
   if (numPoints == 0) {
      ForceRecalc();
      return;
   }

   double when, value;

   // Handle special case 1 point.
   if (numPoints == 1) {
      // only one point, so ensure it is in range then return.
      when = mCurves[currentCurve].points[0].Freq;
      if (mLin) {
         when = when / mHiFreq;
      }
      else {   // log scale
         // We don't go below loFreqI (20 Hz) in log view.
         double loLog = log10((double)loFreqI);
         double hiLog = log10(mHiFreq);
         double denom = hiLog - loLog;
         when = (log10(std::max((double) loFreqI, when)) - loLog)/denom;
      }
      value = mCurves[currentCurve].points[0].dB;
      env->InsertOrReplace(std::min(1.0, std::max(0.0, when)), value);
      ForceRecalc();
      return;
   }

   // We have at least two points, so ensure they are in frequency order.
   std::sort(mCurves[currentCurve].points.begin(),
             mCurves[currentCurve].points.end());

   if (mCurves[currentCurve].points[0].Freq < 0) {
      // Corrupt or invalid curve, so bail.
      ForceRecalc();
      return;
   }

   if(mLin) {   // linear Hz scale
      for(int pointCount = 0; pointCount < numPoints; pointCount++) {
         when = mCurves[currentCurve].points[pointCount].Freq / mHiFreq;
         value = mCurves[currentCurve].points[pointCount].dB;
         if(when <= 1) {
            env->InsertOrReplace(when, value);
            if (when == 1)
               break;
         }
         else {
            // There are more points at higher freqs,
            // so interpolate next one then stop.
            when = 1.0;
            double nextDB = mCurves[currentCurve].points[pointCount].dB;
            if (pointCount > 0) {
               double nextF = mCurves[currentCurve].points[pointCount].Freq;
               double lastF = mCurves[currentCurve].points[pointCount-1].Freq;
               double lastDB = mCurves[currentCurve].points[pointCount-1].dB;
               value = lastDB +
                  ((nextDB - lastDB) *
                     ((mHiFreq - lastF) / (nextF - lastF)));
            }
            else
               value = nextDB;
            env->InsertOrReplace(when, value);
            break;
         }
      }
   }
   else {   // log Hz scale
      double loLog = log10((double) loFreqI);
      double hiLog = log10(mHiFreq);
      double denom = hiLog - loLog;
      int firstAbove20Hz;

      // log scale EQ starts at 20 Hz (threshold of hearing).
      // so find the first point (if any) above 20 Hz.
      for (firstAbove20Hz = 0; firstAbove20Hz < numPoints; firstAbove20Hz++) {
         if (mCurves[currentCurve].points[firstAbove20Hz].Freq > loFreqI)
            break;
      }

      if (firstAbove20Hz == numPoints) {
         // All points below 20 Hz, so just use final point.
         when = 0.0;
         value = mCurves[currentCurve].points[numPoints-1].dB;
         env->InsertOrReplace(when, value);
         ForceRecalc();
         return;
      }

      if (firstAbove20Hz > 0) {
         // At least one point is before 20 Hz and there are more
         // beyond 20 Hz, so interpolate the first
         double prevF = mCurves[currentCurve].points[firstAbove20Hz-1].Freq;
         prevF = log10(std::max(1.0, prevF)); // log zero is bad.
         double prevDB = mCurves[currentCurve].points[firstAbove20Hz-1].dB;
         double nextF = log10(mCurves[currentCurve].points[firstAbove20Hz].Freq);
         double nextDB = mCurves[currentCurve].points[firstAbove20Hz].dB;
         when = 0.0;
         value = nextDB - ((nextDB - prevDB) * ((nextF - loLog) / (nextF - prevF)));
         env->InsertOrReplace(when, value);
      }

      // Now get the rest.
      for(int pointCount = firstAbove20Hz; pointCount < numPoints; pointCount++)
      {
         double flog = log10(mCurves[currentCurve].points[pointCount].Freq);
         wxASSERT(mCurves[currentCurve].points[pointCount].Freq >= loFreqI);

         when = (flog - loLog)/denom;
         value = mCurves[currentCurve].points[pointCount].dB;
         if(when <= 1.0) {
            env->InsertOrReplace(when, value);
         }
         else {
            // This looks weird when adjusting curve in Draw mode if
            // there is a point off-screen.

            /*
            // we have a point beyond fs/2.  Insert it so that env code can use it.
            // but just this one, we have no use for the rest
            env->SetTrackLen(when); // can't Insert if the envelope isn't long enough
            env->Insert(when, value);
            break;
            */

            // interpolate the final point instead
            when = 1.0;
            if (pointCount > 0) {
               double lastDB = mCurves[currentCurve].points[pointCount-1].dB;
               double logLastF =
                  log10(mCurves[currentCurve].points[pointCount-1].Freq);
               value = lastDB +
                  ((value - lastDB) *
                     ((log10(mHiFreq) - logLastF) / (flog - logLastF)));
            }
            env->InsertOrReplace(when, value);
            break;
         }
      }
   }
   ForceRecalc();
}

void EffectEqualization::setCurve()
{
   setCurve((int) mCurves.size() - 1);
}

void EffectEqualization::setCurve(const wxString &curveName)
{
   unsigned i = 0;
   for( i = 0; i < mCurves.size(); i++ )
      if( curveName == mCurves[ i ].Name )
         break;
   if( i == mCurves.size())
   {
      Effect::MessageBox( _("Requested curve not found, using 'unnamed'"),
         wxOK|wxICON_ERROR,
         _("Curve not found") );
      setCurve();
   }
   else
      setCurve( i );
}

//
// Set NEW curve selection (safe to call outside of the UI)
//
void EffectEqualization::Select( int curve )
{
   // Set current choice
   if (mCurve)
   {
      mCurve->SetSelection( curve );
      mCurveName = mCurves[ curve ].Name;
   }
}

//
// Tell panel to recalc (safe to call outside of UI)
//
void EffectEqualization::ForceRecalc()
{
   if (mPanel)
   {
      mPanel->ForceRecalc();
   }
}

//
// Capture updated envelope
//
void EffectEqualization::EnvelopeUpdated()
{
   if (IsLinear())
   {
      EnvelopeUpdated(mLinEnvelope.get(), true);
   }
   else
   {
      EnvelopeUpdated(mLogEnvelope.get(), false);
   }
}

void EffectEqualization::EnvelopeUpdated(Envelope *env, bool lin)
{
   // Allocate and populate point arrays
   size_t numPoints = env->GetNumberOfPoints();
   Doubles when{ numPoints };
   Doubles value{ numPoints };
   env->GetPoints( when.get(), value.get(), numPoints );

   // Clear the unnamed curve
   int curve = mCurves.size() - 1;
   mCurves[ curve ].points.clear();

   if(lin)
   {
      // Copy and convert points
      for (size_t point = 0; point < numPoints; point++)
      {
         double freq = when[ point ] * mHiFreq;
         double db = value[ point ];

         // Add it to the curve
         mCurves[ curve ].points.push_back( EQPoint( freq, db ) );
      }
   }
   else
   {
      double loLog = log10( 20. );
      double hiLog = log10( mHiFreq );
      double denom = hiLog - loLog;

      // Copy and convert points
      for (size_t point = 0; point < numPoints; point++)
      {
         double freq = pow( 10., ( ( when[ point ] * denom ) + loLog ));
         double db = value[ point ];

         // Add it to the curve
         mCurves[ curve ].points.push_back( EQPoint( freq, db ) );
      }
   }
   // Remember that we've updated the unnamed curve
   mDirty = true;

   // set 'unnamed' as the selected curve
   Select( (int) mCurves.size() - 1 );
}

//
//
//
bool EffectEqualization::IsLinear()
{
   return mDrawMode && mLin;
}

//
// Flatten the curve
//
void EffectEqualization::Flatten()
{
   mLogEnvelope->Flatten(0.);
   mLogEnvelope->SetTrackLen(1.0);
   mLinEnvelope->Flatten(0.);
   mLinEnvelope->SetTrackLen(1.0);
   ForceRecalc();
   if( !mDrawMode )
   {
      for( size_t i = 0; i < mBandsInUse; i++)
      {
         mSliders[i]->SetValue(0);
         mSlidersOld[i] = 0;
         mEQVals[i] = 0.;

         wxString tip;
         if( kThirdOct[i] < 1000.)
            tip.Printf( wxT("%dHz\n%.1fdB"), (int)kThirdOct[i], 0. );
         else
            tip.Printf( wxT("%gkHz\n%.1fdB"), kThirdOct[i]/1000., 0. );
         mSliders[i]->SetToolTip(tip);
      }
   }
   EnvelopeUpdated();
}

//
// Process XML tags and handle the ones we recognize
//
bool EffectEqualization::HandleXMLTag(const wxChar *tag, const wxChar **attrs)
{
   // May want to add a version strings...
   if( !wxStrcmp( tag, wxT("equalizationeffect") ) )
   {
      return true;
   }

   // Located a NEW curve
   if( !wxStrcmp(tag, wxT("curve") ) )
   {
      // Process the attributes
      while( *attrs )
      {
         // Cache attr/value and bump to next
         const wxChar *attr = *attrs++;
         const wxChar *value = *attrs++;

         // Create a NEW curve and name it
         if( !wxStrcmp( attr, wxT("name") ) )
         {
            const wxString strValue = value;
            if (!XMLValueChecker::IsGoodString(strValue))
               return false;
            // check for a duplicate name and add (n) if there is one
            int n = 0;
            wxString strValueTemp = strValue;
            bool exists;
            do
            {
               exists = false;
               for(size_t i = 0; i < mCurves.size(); i++)
               {
                  if(n>0)
                     strValueTemp.Printf(wxT("%s (%d)"),strValue,n);
                  if(mCurves[i].Name == strValueTemp)
                  {
                     exists = true;
                     break;
                  }
               }
               n++;
            }
            while(exists == true);

            mCurves.push_back( EQCurve( strValueTemp ) );
         }
      }

      // Tell caller it was processed
      return true;
   }

   // Located a NEW point
   if( !wxStrcmp( tag, wxT("point") ) )
   {
      // Set defaults in case attributes are missing
      double f = 0.0;
      double d = 0.0;

      // Process the attributes
      double dblValue;
      while( *attrs )
      {   // Cache attr/value and bump to next
         const wxChar *attr = *attrs++;
         const wxChar *value = *attrs++;

         const wxString strValue = value;

         // Get the frequency
         if( !wxStrcmp( attr, wxT("f") ) )
         {
            if (!XMLValueChecker::IsGoodString(strValue) ||
               !Internat::CompatibleToDouble(strValue, &dblValue))
               return false;
            f = dblValue;
         }
         // Get the dB
         else if( !wxStrcmp( attr, wxT("d") ) )
         {
            if (!XMLValueChecker::IsGoodString(strValue) ||
               !Internat::CompatibleToDouble(strValue, &dblValue))
               return false;
            d = dblValue;
         }
      }

      // Create a NEW point
      mCurves[ mCurves.size() - 1 ].points.push_back( EQPoint( f, d ) );

      // Tell caller it was processed
      return true;
   }

   // Tell caller we didn't understand the tag
   return false;
}

//
// Return handler for recognized tags
//
XMLTagHandler *EffectEqualization::HandleXMLChild(const wxChar *tag)
{
   if( !wxStrcmp( tag, wxT("equalizationeffect") ) )
   {
      return this;
   }

   if( !wxStrcmp( tag, wxT("curve") ) )
   {
      return this;
   }

   if( !wxStrcmp( tag, wxT("point") ) )
   {
      return this;
   }

   return NULL;
}

//
// Write all of the curves to the XML file
//
void EffectEqualization::WriteXML(XMLWriter &xmlFile) const
// may throw
{
   // Start our heirarchy
   xmlFile.StartTag( wxT( "equalizationeffect" ) );

   // Write all curves
   int numCurves = mCurves.size();
   int curve;
   for( curve = 0; curve < numCurves; curve++ )
   {
      // Start a NEW curve
      xmlFile.StartTag( wxT( "curve" ) );
      xmlFile.WriteAttr( wxT( "name" ), mCurves[ curve ].Name );

      // Write all points
      int numPoints = mCurves[ curve ].points.size();
      int point;
      for( point = 0; point < numPoints; point++ )
      {
         // Write NEW point
         xmlFile.StartTag( wxT( "point" ) );
         xmlFile.WriteAttr( wxT( "f" ), mCurves[ curve ].points[ point ].Freq, 12 );
         xmlFile.WriteAttr( wxT( "d" ), mCurves[ curve ].points[ point ].dB, 12 );
         xmlFile.EndTag( wxT( "point" ) );
      }

      // Terminate curve
      xmlFile.EndTag( wxT( "curve" ) );
   }

   // Terminate our heirarchy
   xmlFile.EndTag( wxT( "equalizationeffect" ) );
}

//
// All EffectEqualization methods beyond this point interact with the UI, so
// can't be called while the UI is not displayed.
//

void EffectEqualization::LayoutEQSliders()
{
   // layout the Graphic EQ sliders here
   wxRect rulerR = mFreqRuler->GetRect();
   int sliderW = mSliders[0]->GetSize().GetWidth();
   int sliderH = mGraphicPanel->GetRect().GetHeight();

   int start = rulerR.GetLeft() - (sliderW / 2);
   float range = rulerR.GetWidth();

   double loLog = log10(mLoFreq);
   double hiLog = log10(mHiFreq);
   double denom = hiLog - loLog;

   for (int i = 0; (i < NUMBER_OF_BANDS) && (kThirdOct[i] <= mHiFreq); ++i)
   {
      // centre of this slider, from start
      float posn = range * (log10(kThirdOct[i]) - loLog) / denom;

      mSliders[i]->SetSize(start + (posn + 0.5), 0, sliderW, sliderH);
   }

   mGraphicPanel->Refresh();
}

void EffectEqualization::UpdateCurves()
{
   // Reload the curve names
   mCurve->Clear();
   bool selectedCurveExists = false;
   for (size_t i = 0, cnt = mCurves.size(); i < cnt; i++)
   {
      if (mCurveName == mCurve)
         selectedCurveExists = true;
      mCurve->Append(mCurves[ i ].Name);
   }
   // In rare circumstances, mCurveName may not exist (bug 1891)
   if (!selectedCurveExists)
      mCurveName = mCurves[ (int)mCurves.size() - 1 ].Name;
   mCurve->SetStringSelection(mCurveName);

   // Allow the control to resize
   mCurve->SetSizeHints(-1, -1);

   // Set initial curve
   setCurve( mCurveName );
}

void EffectEqualization::UpdateDraw()
{
   size_t numPoints = mLogEnvelope->GetNumberOfPoints();
   Doubles when{ numPoints };
   Doubles value{ numPoints };
   double deltadB = 0.1;
   double dx, dy, dx1, dy1, err;

   mLogEnvelope->GetPoints( when.get(), value.get(), numPoints );

   // set 'unnamed' as the selected curve
   EnvelopeUpdated();

   bool flag = true;
   while (flag)
   {
      flag = false;
      int numDeleted = 0;
      mLogEnvelope->GetPoints( when.get(), value.get(), numPoints );
      for (size_t j = 0; j + 2 < numPoints; j++)
      {
         dx = when[j+2+numDeleted] - when[j+numDeleted];
         dy = value[j+2+numDeleted] - value[j+numDeleted];
         dx1 = when[j+numDeleted+1] - when[j+numDeleted];
         dy1 = dy * dx1 / dx;
         err = fabs(value[j+numDeleted+1] - (value[j+numDeleted] + dy1));
         if( err < deltadB )
         {   // within < deltadB dB?
            mLogEnvelope->Delete(j+1);
            numPoints--;
            numDeleted++;
            flag = true;
         }
      }
   }

   if(mLin) // do not use IsLinear() here
   {
      EnvLogToLin();
      mEnvelope = mLinEnvelope.get();
      mFreqRuler->ruler.SetLog(false);
      mFreqRuler->ruler.SetRange(0, mHiFreq);
   }

   szrV->Show(szrG,false);
   szrH->Show(szrI,false);
   szrH->Show(szrL,true);

   mUIParent->Layout();
   wxGetTopLevelParent(mUIParent)->Layout();
   ForceRecalc();     // it may have changed slightly due to the deletion of points
}

void EffectEqualization::UpdateGraphic()
{
   double loLog = log10(mLoFreq);
   double hiLog = log10(mHiFreq);
   double denom = hiLog - loLog;

   if(mLin)  //going from lin to log freq scale - do not use IsLinear() here
   {  // add some extra points to the linear envelope for the graphic to follow
      double step = pow(2., 1./12.);   // twelve steps per octave
      double when,value;
      for(double freq=10.; freq<mHiFreq; freq*=step)
      {
         when = freq/mHiFreq;
         value = mLinEnvelope->GetValue(when);
         mLinEnvelope->InsertOrReplace(when, value);
      }

      EnvLinToLog();
      mEnvelope = mLogEnvelope.get();
      mFreqRuler->ruler.SetLog(true);
      mFreqRuler->ruler.SetRange(mLoFreq, mHiFreq);
   }

   for (size_t i = 0; i < mBandsInUse; i++)
   {
      if( kThirdOct[i] == mLoFreq )
         mWhenSliders[i] = 0.;
      else
         mWhenSliders[i] = (log10(kThirdOct[i])-loLog)/denom;
      mEQVals[i] = mLogEnvelope->GetValue(mWhenSliders[i]);    //set initial values of sliders
      if( mEQVals[i] > 20.)
         mEQVals[i] = 20.;
      if( mEQVals[i] < -20.)
         mEQVals[i] = -20.;
   }
   ErrMin();                  //move sliders to minimise error
   for (size_t i = 0; i < mBandsInUse; i++)
   {
      mSliders[i]->SetValue(lrint(mEQVals[i])); //actually set slider positions
      mSlidersOld[i] = mSliders[i]->GetValue();
      wxString tip;
      if( kThirdOct[i] < 1000.)
         tip.Printf( wxT("%dHz\n%.1fdB"), (int)kThirdOct[i], mEQVals[i] );
      else
         tip.Printf( wxT("%gkHz\n%.1fdB"), kThirdOct[i]/1000., mEQVals[i] );
      mSliders[i]->SetToolTip(tip);
   }

   szrV->Show(szrG,true);  // eq sliders
   szrH->Show(szrI,true);  // interpolation choice
   szrH->Show(szrL,false); // linear freq checkbox

   mUIParent->Layout();
   wxGetTopLevelParent(mUIParent)->Layout();
//   mUIParent->Layout();    // Make all sizers get resized first
   LayoutEQSliders();      // Then layout sliders
   mUIParent->Layout();
   wxGetTopLevelParent(mUIParent)->Layout();
//   mUIParent->Layout();    // And layout again to resize dialog

#if 0
   wxSize wsz = mUIParent->GetSize();
   wxSize ssz = szrV->GetSize();
   if (ssz.x > wsz.x || ssz.y > wsz.y)
   {
      mUIParent->Fit();
   }
#endif
   GraphicEQ(mLogEnvelope.get());
   mDrawMode = false;
}

void EffectEqualization::EnvLogToLin(void)
{
   size_t numPoints = mLogEnvelope->GetNumberOfPoints();
   if( numPoints == 0 )
   {
      return;
   }

   Doubles when{ numPoints };
   Doubles value{ numPoints };

   mLinEnvelope->Flatten(0.);
   mLinEnvelope->SetTrackLen(1.0);
   mLogEnvelope->GetPoints( when.get(), value.get(), numPoints );
   mLinEnvelope->Reassign(0., value[0]);
   double loLog = log10(20.);
   double hiLog = log10(mHiFreq);
   double denom = hiLog - loLog;

   for (size_t i = 0; i < numPoints; i++)
      mLinEnvelope->InsertOrReplace(pow( 10., ((when[i] * denom) + loLog))/mHiFreq , value[i]);
   mLinEnvelope->Reassign(1., value[numPoints-1]);
}

void EffectEqualization::EnvLinToLog(void)
{
   size_t numPoints = mLinEnvelope->GetNumberOfPoints();
   if( numPoints == 0 )
   {
      return;
   }

   Doubles when{ numPoints };
   Doubles value{ numPoints };

   mLogEnvelope->Flatten(0.);
   mLogEnvelope->SetTrackLen(1.0);
   mLinEnvelope->GetPoints( when.get(), value.get(), numPoints );
   mLogEnvelope->Reassign(0., value[0]);
   double loLog = log10(20.);
   double hiLog = log10(mHiFreq);
   double denom = hiLog - loLog;
   bool changed = false;

   for (size_t i = 0; i < numPoints; i++)
   {
      if( when[i]*mHiFreq >= 20 )
      {
         // Caution: on Linux, when when == 20, the log calulation rounds
         // to just under zero, which causes an assert error.
         double flog = (log10(when[i]*mHiFreq)-loLog)/denom;
         mLogEnvelope->InsertOrReplace(std::max(0.0, flog) , value[i]);
      }
      else
      {  //get the first point as close as we can to the last point requested
         changed = true;
         double v = value[i];
         mLogEnvelope->InsertOrReplace(0., v);
      }
   }
   mLogEnvelope->Reassign(1., value[numPoints - 1]);

   if(changed)
      EnvelopeUpdated(mLogEnvelope.get(), false);
}

void EffectEqualization::ErrMin(void)
{
   double vals[NUM_PTS];
   double error = 0.0;
   double oldError = 0.0;
   double mEQValsOld = 0.0;
   double correction = 1.6;
   bool flag;
   size_t j=0;
   Envelope testEnvelope{ *mLogEnvelope };

   for(size_t i = 0; i < NUM_PTS; i++)
      vals[i] = testEnvelope.GetValue(mWhens[i]);

   //   Do error minimisation
   error = 0.;
   GraphicEQ(&testEnvelope);
   for(size_t i = 0; i < NUM_PTS; i++)   //calc initial error
   {
      double err = vals[i] - testEnvelope.GetValue(mWhens[i]);
      error += err*err;
   }
   oldError = error;
   while( j < mBandsInUse*12 )  //loop over the sliders a number of times
   {
      auto i = j % mBandsInUse;       //use this slider
      if( (j > 0) & (i == 0) )   // if we've come back to the first slider again...
      {
         if( correction > 0 )
            correction = -correction;     //go down
         else
            correction = -correction/2.;  //go up half as much
      }
      flag = true;   // check if we've hit the slider limit
      do
      {
         oldError = error;
         mEQValsOld = mEQVals[i];
         mEQVals[i] += correction;    //move fader value
         if( mEQVals[i] > 20. )
         {
            mEQVals[i] = 20.;
            flag = false;
         }
         if( mEQVals[i] < -20. )
         {
            mEQVals[i] = -20.;
            flag = false;
         }
         GraphicEQ(&testEnvelope);         //calculate envelope
         error = 0.;
         for(size_t k = 0; k < NUM_PTS; k++)  //calculate error
         {
            double err = vals[k] - testEnvelope.GetValue(mWhens[k]);
            error += err*err;
         }
      }
      while( (error < oldError) && flag );
      if( error > oldError )
      {
         mEQVals[i] = mEQValsOld;   //last one didn't work
         error = oldError;
      }
      else
         oldError = error;
      if( error < .0025 * mBandsInUse)
         break;   // close enuff
      j++;  //try next slider
   }
   if( error > .0025 * mBandsInUse ) // not within 0.05dB on each slider, on average
   {
      Select( (int) mCurves.size() - 1 );
      EnvelopeUpdated(&testEnvelope, false);
   }
}

void EffectEqualization::GraphicEQ(Envelope *env)
{
   // JKC: 'value' is for height of curve.
   // The 0.0 initial value would only get used if NUM_PTS were 0.
   double value = 0.0;
   double dist, span, s;

   env->Flatten(0.);
   env->SetTrackLen(1.0);

   switch( mInterp )
   {
   case kBspline:  // B-spline
      {
         int minF = 0;
         for(size_t i = 0; i < NUM_PTS; i++)
         {
            while( (mWhenSliders[minF] <= mWhens[i]) & (minF < (int)mBandsInUse) )
               minF++;
            minF--;
            if( minF < 0 ) //before first slider
            {
               dist = mWhens[i] - mWhenSliders[0];
               span = mWhenSliders[1] - mWhenSliders[0];
               s = dist/span;
               if( s < -1.5 )
                  value = 0.;
               else if( s < -.5 )
                  value = mEQVals[0]*(s + 1.5)*(s + 1.5)/2.;
               else
                  value = mEQVals[0]*(.75 - s*s) + mEQVals[1]*(s + .5)*(s + .5)/2.;
            }
            else
            {
               if( mWhens[i] > mWhenSliders[mBandsInUse-1] )   //after last fader
               {
                  dist = mWhens[i] - mWhenSliders[mBandsInUse-1];
                  span = mWhenSliders[mBandsInUse-1] - mWhenSliders[mBandsInUse-2];
                  s = dist/span;
                  if( s > 1.5 )
                     value = 0.;
                  else if( s > .5 )
                     value = mEQVals[mBandsInUse-1]*(s - 1.5)*(s - 1.5)/2.;
                  else
                     value = mEQVals[mBandsInUse-1]*(.75 - s*s) +
                     mEQVals[mBandsInUse-2]*(s - .5)*(s - .5)/2.;
               }
               else  //normal case
               {
                  dist = mWhens[i] - mWhenSliders[minF];
                  span = mWhenSliders[minF+1] - mWhenSliders[minF];
                  s = dist/span;
                  if(s < .5 )
                  {
                     value = mEQVals[minF]*(0.75 - s*s);
                     if( minF+1 < (int)mBandsInUse )
                        value += mEQVals[minF+1]*(s+.5)*(s+.5)/2.;
                     if( minF-1 >= 0 )
                        value += mEQVals[minF-1]*(s-.5)*(s-.5)/2.;
                  }
                  else
                  {
                     value = mEQVals[minF]*(s-1.5)*(s-1.5)/2.;
                     if( minF+1 < (int)mBandsInUse )
                        value += mEQVals[minF+1]*(.75-(1.-s)*(1.-s));
                     if( minF+2 < (int)mBandsInUse )
                        value += mEQVals[minF+2]*(s-.5)*(s-.5)/2.;
                  }
               }
            }
            if(mWhens[i]<=0.)
               env->Reassign(0., value);
            env->InsertOrReplace( mWhens[i], value );
         }
         env->Reassign( 1., value );
         break;
      }

   case kCosine:  // Cosine squared
      {
         int minF = 0;
         for(size_t i = 0; i < NUM_PTS; i++)
         {
            while( (mWhenSliders[minF] <= mWhens[i]) & (minF < (int)mBandsInUse) )
               minF++;
            minF--;
            if( minF < 0 ) //before first slider
            {
               dist = mWhenSliders[0] - mWhens[i];
               span = mWhenSliders[1] - mWhenSliders[0];
               if( dist < span )
                  value = mEQVals[0]*(1. + cos(M_PI*dist/span))/2.;
               else
                  value = 0.;
            }
            else
            {
               if( mWhens[i] > mWhenSliders[mBandsInUse-1] )   //after last fader
               {
                  span = mWhenSliders[mBandsInUse-1] - mWhenSliders[mBandsInUse-2];
                  dist = mWhens[i] - mWhenSliders[mBandsInUse-1];
                  if( dist < span )
                     value = mEQVals[mBandsInUse-1]*(1. + cos(M_PI*dist/span))/2.;
                  else
                     value = 0.;
               }
               else  //normal case
               {
                  span = mWhenSliders[minF+1] - mWhenSliders[minF];
                  dist = mWhenSliders[minF+1] - mWhens[i];
                  value = mEQVals[minF]*(1. + cos(M_PI*(span-dist)/span))/2. +
                     mEQVals[minF+1]*(1. + cos(M_PI*dist/span))/2.;
               }
            }
            if(mWhens[i]<=0.)
               env->Reassign(0., value);
            env->InsertOrReplace( mWhens[i], value );
         }
         env->Reassign( 1., value );
         break;
      }

   case kCubic:  // Cubic Spline
      {
         double y2[NUMBER_OF_BANDS+1];
         mEQVals[mBandsInUse] = mEQVals[mBandsInUse-1];
         spline(mWhenSliders, mEQVals, mBandsInUse+1, y2);
         for(double xf=0; xf<1.; xf+=1./NUM_PTS)
         {
            env->InsertOrReplace(xf, splint(mWhenSliders, mEQVals, mBandsInUse+1, y2, xf));
         }
         break;
      }
   }

   ForceRecalc();
}

void EffectEqualization::spline(double x[], double y[], size_t n, double y2[])
{
   wxASSERT( n > 0 );

   double p, sig;
   Doubles u{ n };

   y2[0] = 0.;  //
   u[0] = 0.;   //'natural' boundary conditions
   for (size_t i = 1; i + 1 < n; i++)
   {
      sig = ( x[i] - x[i-1] ) / ( x[i+1] - x[i-1] );
      p = sig * y2[i-1] + 2.;
      y2[i] = (sig - 1.)/p;
      u[i] = ( y[i+1] - y[i] ) / ( x[i+1] - x[i] ) - ( y[i] - y[i-1] ) / ( x[i] - x[i-1] );
      u[i] = (6.*u[i]/( x[i+1] - x[i-1] ) - sig * u[i-1]) / p;
   }
   y2[n - 1] = 0.;
   for (size_t i = n - 1; i--;)
      y2[i] = y2[i]*y2[i+1] + u[i];
}

double EffectEqualization::splint(double x[], double y[], size_t n, double y2[], double xr)
{
   wxASSERT( n > 1 );

   double a, b, h;
   static double xlast = 0.;   // remember last x value requested
   static size_t k = 0;           // and which interval we were in

   if( xr < xlast )
      k = 0;                   // gone back to start, (or somewhere to the left)
   xlast = xr;
   while( (x[k] <= xr) && (k + 1 < n) )
      k++;
   wxASSERT( k > 0 );
   k--;
   h = x[k+1] - x[k];
   a = ( x[k+1] - xr )/h;
   b = (xr - x[k])/h;
   return( a*y[k]+b*y[k+1]+((a*a*a-a)*y2[k]+(b*b*b-b)*y2[k+1])*h*h/6.);
}

void EffectEqualization::OnSize(wxSizeEvent & event)
{
   mUIParent->Layout();

   if (!mDrawMode)
   {
      LayoutEQSliders();
   }

   event.Skip();
}

void EffectEqualization::OnSlider(wxCommandEvent & event)
{
   wxSlider *s = (wxSlider *)event.GetEventObject();
   for (size_t i = 0; i < mBandsInUse; i++)
   {
      if( s == mSliders[i])
      {
         int posn = mSliders[i]->GetValue();
         if( wxGetKeyState(WXK_SHIFT) )
         {
            if( posn > mSlidersOld[i] )
               mEQVals[i] += (float).1;
            else
               if( posn < mSlidersOld[i] )
                  mEQVals[i] -= .1f;
         }
         else
            mEQVals[i] += (posn - mSlidersOld[i]);
         if( mEQVals[i] > 20. )
            mEQVals[i] = 20.;
         if( mEQVals[i] < -20. )
            mEQVals[i] = -20.;
         int newPosn = (int)mEQVals[i];
         mSliders[i]->SetValue( newPosn );
         mSlidersOld[i] = newPosn;
         wxString tip;
         if( kThirdOct[i] < 1000.)
            tip.Printf( wxT("%dHz\n%.1fdB"), (int)kThirdOct[i], mEQVals[i] );
         else
            tip.Printf( wxT("%gkHz\n%.1fdB"), kThirdOct[i]/1000., mEQVals[i] );
         s->SetToolTip(tip);
         break;
      }
   }
   GraphicEQ(mLogEnvelope.get());
   EnvelopeUpdated();
}

void EffectEqualization::OnInterp(wxCommandEvent & WXUNUSED(event))
{
   if (mGraphic->GetValue())
   {
      GraphicEQ(mLogEnvelope.get());
      EnvelopeUpdated();
   }
   mInterp = mInterpChoice->GetSelection();
}

void EffectEqualization::OnDrawMode(wxCommandEvent & WXUNUSED(event))
{
   UpdateDraw();

   mDrawMode = true;
}

void EffectEqualization::OnGraphicMode(wxCommandEvent & WXUNUSED(event))
{
   UpdateGraphic();

   mDrawMode = false;
}

void EffectEqualization::OnSliderM(wxCommandEvent & WXUNUSED(event))
{
   TransferDataFromWindow();
   ForceRecalc();
}

void EffectEqualization::OnSliderDBMIN(wxCommandEvent & WXUNUSED(event))
{
   TransferDataFromWindow();
}

void EffectEqualization::OnSliderDBMAX(wxCommandEvent & WXUNUSED(event))
{
   TransferDataFromWindow();
}

//
// New curve was selected
//
void EffectEqualization::OnCurve(wxCommandEvent & WXUNUSED(event))
{
   // Select NEW curve
   wxASSERT( mCurve != NULL );
   setCurve( mCurve->GetCurrentSelection() );
   if( !mDrawMode )
      UpdateGraphic();
}

//
// User wants to modify the list in some way
//
void EffectEqualization::OnManage(wxCommandEvent & WXUNUSED(event))
{
   EditCurvesDialog d(mUIParent, this, mCurve->GetSelection());
   d.ShowModal();

   // Reload the curve names
   UpdateCurves();

   // Allow control to resize
   mUIParent->Layout();
}

void EffectEqualization::OnClear(wxCommandEvent & WXUNUSED(event))
{
   Flatten();
}

void EffectEqualization::OnInvert(wxCommandEvent & WXUNUSED(event)) // Inverts any curve
{
   if(!mDrawMode)   // Graphic (Slider) mode. Invert the sliders.
   {
      for (size_t i = 0; i < mBandsInUse; i++)
      {
         mEQVals[i] = -mEQVals[i];
         int newPosn = (int)mEQVals[i];
         mSliders[i]->SetValue( newPosn );
         mSlidersOld[i] = newPosn;

         wxString tip;
         if( kThirdOct[i] < 1000.)
            tip.Printf( wxT("%dHz\n%.1fdB"), (int)kThirdOct[i], mEQVals[i] );
         else
            tip.Printf( wxT("%gkHz\n%.1fdB"), kThirdOct[i]/1000., mEQVals[i] );
         mSliders[i]->SetToolTip(tip);
      }
      GraphicEQ(mLogEnvelope.get());
   }
   else  // Draw mode.  Invert the points.
   {
      bool lin = IsLinear(); // refers to the 'log' or 'lin' of the frequency scale, not the amplitude
      size_t numPoints; // number of points in the curve/envelope

      // determine if log or lin curve is the current one
      // and find out how many points are in the curve
      if(lin)  // lin freq scale and so envelope
      {
         numPoints = mLinEnvelope->GetNumberOfPoints();
      }
      else
      {
         numPoints = mLogEnvelope->GetNumberOfPoints();
      }

      if( numPoints == 0 )
         return;

      Doubles when{ numPoints };
      Doubles value{ numPoints };

      if(lin)
         mLinEnvelope->GetPoints( when.get(), value.get(), numPoints );
      else
         mLogEnvelope->GetPoints( when.get(), value.get(), numPoints );

      // invert the curve
      for (size_t i = 0; i < numPoints; i++)
      {
         if(lin)
            mLinEnvelope->Reassign(when[i] , -value[i]);
         else
            mLogEnvelope->Reassign(when[i] , -value[i]);
      }

      // copy it back to the other one (just in case)
      if(lin)
         EnvLinToLog();
      else
         EnvLogToLin();
   }

   // and update the display etc
   ForceRecalc();
   EnvelopeUpdated();
}

void EffectEqualization::OnGridOnOff(wxCommandEvent & WXUNUSED(event))
{
   mDrawGrid = mGridOnOff->IsChecked();
   mPanel->Refresh(false);
}

void EffectEqualization::OnLinFreq(wxCommandEvent & WXUNUSED(event))
{
   mLin = mLinFreq->IsChecked();
   if(IsLinear())  //going from log to lin freq scale
   {
      mFreqRuler->ruler.SetLog(false);
      mFreqRuler->ruler.SetRange(0, mHiFreq);
      EnvLogToLin();
      mEnvelope = mLinEnvelope.get();
      mLin = true;
   }
   else  //going from lin to log freq scale
   {
      mFreqRuler->ruler.SetLog(true);
      mFreqRuler->ruler.SetRange(mLoFreq, mHiFreq);
      EnvLinToLog();
      mEnvelope = mLogEnvelope.get();
      mLin = false;
   }
   mFreqRuler->Refresh(false);
   ForceRecalc();
}

#ifdef EXPERIMENTAL_EQ_SSE_THREADED

void EffectEqualization::OnProcessingRadio(wxCommandEvent & event)
{
   int testEvent=event.GetId();
   switch(testEvent)
   {
   case ID_DefaultMath: EffectEqualization48x::SetMathPath(MATH_FUNCTION_ORIGINAL);
      break;
   case ID_SSE: EffectEqualization48x::SetMathPath(MATH_FUNCTION_SSE);
      break;
   case ID_SSEThreaded: EffectEqualization48x::SetMathPath(MATH_FUNCTION_THREADED | MATH_FUNCTION_SSE);
      break;
   case ID_AVX: testEvent = 2;
      break;
   case ID_AVXThreaded: testEvent = 2;
      break;
   }

};

void EffectEqualization::OnBench( wxCommandEvent & event)
{
   mBench=true;
   // OnOk(event);
}

#endif

//----------------------------------------------------------------------------
// EqualizationPanel
//----------------------------------------------------------------------------

BEGIN_EVENT_TABLE(EqualizationPanel, wxPanelWrapper)
   EVT_PAINT(EqualizationPanel::OnPaint)
   EVT_MOUSE_EVENTS(EqualizationPanel::OnMouseEvent)
   EVT_MOUSE_CAPTURE_LOST(EqualizationPanel::OnCaptureLost)
   EVT_SIZE(EqualizationPanel::OnSize)
END_EVENT_TABLE()

EqualizationPanel::EqualizationPanel(
   wxWindow *parent, wxWindowID winid, EffectEqualization *effect)
:  wxPanelWrapper(parent, winid)
{
   mParent = parent;
   mEffect = effect;

   mBitmap = NULL;
   mWidth = 0;
   mHeight = 0;

   mLinEditor = std::make_unique<EnvelopeEditor>(*mEffect->mLinEnvelope, false);
   mLogEditor = std::make_unique<EnvelopeEditor>(*mEffect->mLogEnvelope, false);
   mEffect->mEnvelope->Flatten(0.);
   mEffect->mEnvelope->SetTrackLen(1.0);

   ForceRecalc();
}

EqualizationPanel::~EqualizationPanel()
{
   if(HasCapture())
      ReleaseMouse();
}

void EqualizationPanel::ForceRecalc()
{
   mRecalcRequired = true;
   Refresh(false);
}

void EqualizationPanel::Recalc()
{
   mOutr = Floats{ mEffect->mWindowSize };
   mOuti = Floats{ mEffect->mWindowSize };

   mEffect->CalcFilter();   //to calculate the actual response
   InverseRealFFT(mEffect->mWindowSize, mEffect->mFilterFuncR.get(), mEffect->mFilterFuncI.get(), mOutr.get());
}

void EqualizationPanel::OnSize(wxSizeEvent &  WXUNUSED(event))
{
   Refresh( false );
}

#include "../TrackPanelDrawingContext.h"
void EqualizationPanel::OnPaint(wxPaintEvent &  WXUNUSED(event))
{
   wxPaintDC dc(this);
   if(mRecalcRequired) {
      Recalc();
      mRecalcRequired = false;
   }
   int width, height;
   GetSize(&width, &height);

   if (!mBitmap || mWidth!=width || mHeight!=height)
   {
      mWidth = width;
      mHeight = height;
      mBitmap = std::make_unique<wxBitmap>(mWidth, mHeight,24);
   }

   wxBrush bkgndBrush(wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE));

   wxMemoryDC memDC;
   memDC.SelectObject(*mBitmap);

   wxRect bkgndRect;
   bkgndRect.x = 0;
   bkgndRect.y = 0;
   bkgndRect.width = mWidth;
   bkgndRect.height = mHeight;
   memDC.SetBrush(bkgndBrush);
   memDC.SetPen(*wxTRANSPARENT_PEN);
   memDC.DrawRectangle(bkgndRect);

   bkgndRect.y = mHeight;
   memDC.DrawRectangle(bkgndRect);

   wxRect border;
   border.x = 0;
   border.y = 0;
   border.width = mWidth;
   border.height = mHeight;

   memDC.SetBrush(*wxWHITE_BRUSH);
   memDC.SetPen(*wxBLACK_PEN);
   memDC.DrawRectangle(border);

   mEnvRect = border;
   mEnvRect.Deflate(PANELBORDER, PANELBORDER);

   // Pure blue x-axis line
   memDC.SetPen(wxPen(theTheme.Colour( clrGraphLines ), 1, wxPENSTYLE_SOLID));
   int center = (int) (mEnvRect.height * mEffect->mdBMax/(mEffect->mdBMax-mEffect->mdBMin) + .5);
   AColor::Line(memDC,
      mEnvRect.GetLeft(), mEnvRect.y + center,
      mEnvRect.GetRight(), mEnvRect.y + center);

   // Draw the grid, if asked for.  Do it now so it's underneath the main plots.
   if( mEffect->mDrawGrid )
   {
      mEffect->mFreqRuler->ruler.DrawGrid(memDC, mEnvRect.height, true, true, PANELBORDER, PANELBORDER);
      mEffect->mdBRuler->ruler.DrawGrid(memDC, mEnvRect.width, true, true, PANELBORDER, PANELBORDER);
   }

   // Med-blue envelope line
   memDC.SetPen(wxPen(theTheme.Colour(clrGraphLines), 3, wxPENSTYLE_SOLID));

   // Draw envelope
   int x, y, xlast = 0, ylast = 0;
   {
      Doubles values{ size_t(mEnvRect.width) };
      mEffect->mEnvelope->GetValues(values.get(), mEnvRect.width, 0.0, 1.0 / mEnvRect.width);
      bool off = false, off1 = false;
      for (int i = 0; i < mEnvRect.width; i++)
      {
         x = mEnvRect.x + i;
         y = lrint(mEnvRect.height*((mEffect->mdBMax - values[i]) / (mEffect->mdBMax - mEffect->mdBMin)) + .25); //needs more optimising, along with'what you get'?
         if (y >= mEnvRect.height)
         {
            y = mEnvRect.height - 1;
            off = true;
         }
         else
         {
            off = false;
            off1 = false;
         }
         if ((i != 0) & (!off1))
         {
            AColor::Line(memDC, xlast, ylast,
               x, mEnvRect.y + y);
         }
         off1 = off;
         xlast = x;
         ylast = mEnvRect.y + y;
      }
   }

   //Now draw the actual response that you will get.
   //mFilterFunc has a linear scale, window has a log one so we have to fiddle about
   memDC.SetPen(wxPen(theTheme.Colour( clrResponseLines ), 1, wxPENSTYLE_SOLID));
   double scale = (double)mEnvRect.height/(mEffect->mdBMax-mEffect->mdBMin);   //pixels per dB
   double yF;   //gain at this freq
   double delta = mEffect->mHiFreq / (((double)mEffect->mWindowSize / 2.));   //size of each freq bin

   bool lin = mEffect->IsLinear();   // log or lin scale?

   double loLog = log10(mEffect->mLoFreq);
   double step = lin ? mEffect->mHiFreq : (log10(mEffect->mHiFreq) - loLog);
   step /= ((double)mEnvRect.width-1.);
   double freq;   //actual freq corresponding to x position
   int halfM = (mEffect->mM - 1) / 2;
   int n;   //index to mFreqFunc
   for(int i=0; i<mEnvRect.width; i++)
   {
      x = mEnvRect.x + i;
      freq = lin ? step*i : pow(10., loLog + i*step);   //Hz
      if( ( lin ? step : (pow(10., loLog + (i+1)*step)-freq) ) < delta)
      {   //not enough resolution in FFT
         // set up for calculating cos using recurrance - faster than calculating it directly each time
         double theta = M_PI*freq/mEffect->mHiFreq;   //radians, normalized
         double wtemp = sin(0.5 * theta);
         double wpr = -2.0 * wtemp * wtemp;
         double wpi = -1.0 * sin(theta);
         double wr = cos(theta*halfM);
         double wi = sin(theta*halfM);

         yF = 0.;
         for(int j=0;j<halfM;j++)
         {
            yF += 2. * mOutr[j] * wr;  // This works for me, compared to the previous version.  Compare wr to cos(theta*(halfM-j)).  Works for me.  Keep everything as doubles though.
            // do recurrance
            wr = (wtemp = wr) * wpr - wi * wpi + wr;
            wi = wi * wpr + wtemp * wpi + wi;
         }
         yF += mOutr[halfM];
         yF = fabs(yF);
         if(yF!=0.)
            yF = LINEAR_TO_DB(yF);
         else
            yF = mEffect->mdBMin;
      }
      else
      {   //use FFT, it has enough resolution
         n = (int)(freq/delta + .5);
         if(pow(mEffect->mFilterFuncR[n],2)+pow(mEffect->mFilterFuncI[n],2)!=0.)
            yF = 10.0*log10(pow(mEffect->mFilterFuncR[n],2)+pow(mEffect->mFilterFuncI[n],2));   //10 here, a power
         else
            yF = mEffect->mdBMin;
      }
      if(yF < mEffect->mdBMin)
         yF = mEffect->mdBMin;
      yF = center-scale*yF;
      if(yF>mEnvRect.height)
         yF = mEnvRect.height - 1;
      if(yF<0.)
         yF=0.;
      y = (int)(yF+.5);

      if (i != 0)
      {
         AColor::Line(memDC, xlast, ylast, x, mEnvRect.y + y);
      }
      xlast = x;
      ylast = mEnvRect.y + y;
   }

   memDC.SetPen(*wxBLACK_PEN);
   if( mEffect->mDraw->GetValue() )
   {
      TrackPanelDrawingContext context{ memDC, {}, {} };
      mEffect->mEnvelope->DrawPoints(
         context, mEnvRect, ZoomInfo(0.0, mEnvRect.width-1), false, 0.0,
      mEffect->mdBMin, mEffect->mdBMax, false);
   }

   dc.Blit(0, 0, mWidth, mHeight, &memDC, 0, 0, wxCOPY, FALSE);
}

void EqualizationPanel::OnMouseEvent(wxMouseEvent & event)
{
   if (!mEffect->mDrawMode)
   {
      return;
   }

   if (event.ButtonDown() && !HasCapture())
   {
      CaptureMouse();
   }

   auto &pEditor = (mEffect->mLin ? mLinEditor : mLogEditor);
   if (pEditor->MouseEvent(event, mEnvRect, ZoomInfo(0.0, mEnvRect.width),
      false, 0.0,
      mEffect->mdBMin, mEffect->mdBMax))
   {
      mEffect->EnvelopeUpdated();
      ForceRecalc();
   }

   if (event.ButtonUp() && HasCapture())
   {
      ReleaseMouse();
   }
}

void EqualizationPanel::OnCaptureLost(wxMouseCaptureLostEvent & WXUNUSED(event))
{
   if (HasCapture())
   {
      ReleaseMouse();
   }
}

//----------------------------------------------------------------------------
// EditCurvesDialog
//----------------------------------------------------------------------------
// Note that the 'modified' curve used to be called 'custom' but is now called 'unnamed'
// Some things that deal with 'unnamed' curves still use, for example, 'mCustomBackup' as variable names.

BEGIN_EVENT_TABLE(EditCurvesDialog, wxDialogWrapper)
   EVT_BUTTON(UpButtonID, EditCurvesDialog::OnUp)
   EVT_BUTTON(DownButtonID, EditCurvesDialog::OnDown)
   EVT_BUTTON(RenameButtonID, EditCurvesDialog::OnRename)
   EVT_BUTTON(DeleteButtonID, EditCurvesDialog::OnDelete)
   EVT_BUTTON(ImportButtonID, EditCurvesDialog::OnImport)
   EVT_BUTTON(ExportButtonID, EditCurvesDialog::OnExport)
   EVT_BUTTON(LibraryButtonID, EditCurvesDialog::OnLibrary)
   EVT_BUTTON(DefaultsButtonID, EditCurvesDialog::OnDefaults)
   EVT_BUTTON(wxID_OK, EditCurvesDialog::OnOK)
   EVT_LIST_ITEM_SELECTED(CurvesListID,
                          EditCurvesDialog::OnListSelectionChange)
   EVT_LIST_ITEM_DESELECTED(CurvesListID,
                          EditCurvesDialog::OnListSelectionChange)
END_EVENT_TABLE()

EditCurvesDialog::EditCurvesDialog(wxWindow * parent, EffectEqualization * effect, int position):
wxDialogWrapper(parent, wxID_ANY, _("Manage Curves List"),
         wxDefaultPosition, wxDefaultSize,
         wxDEFAULT_DIALOG_STYLE | wxRESIZE_BORDER)
{
   SetLabel(_("Manage Curves"));         // Provide visual label
   SetName(_("Manage Curves List"));     // Provide audible label
   mParent = parent;
   mEffect = effect;
   mPosition = position;
   // make a copy of mEffect->mCurves here to muck about with.
   mEditCurves.clear();
   for (unsigned int i = 0; i < mEffect->mCurves.size(); i++)
   {
      mEditCurves.push_back(mEffect->mCurves[i].Name);
      mEditCurves[i].points = mEffect->mCurves[i].points;
   }

   Populate();
   SetMinSize(GetSize());
}

EditCurvesDialog::~EditCurvesDialog()
{
}

void EditCurvesDialog::Populate()
{
   //------------------------- Main section --------------------
   ShuttleGui S(this, eIsCreating);
   PopulateOrExchange(S);
   // ----------------------- End of main section --------------
}

void EditCurvesDialog::PopulateOrExchange(ShuttleGui & S)
{
   S.StartHorizontalLay(wxEXPAND);
   {
      S.StartStatic(_("&Curves"), 1);
      {
         S.SetStyle(wxSUNKEN_BORDER | wxLC_REPORT | wxLC_HRULES | wxLC_VRULES );
         mList = S.Id(CurvesListID).AddListControlReportMode();
         mList->InsertColumn(0, _("Curve Name"), wxLIST_FORMAT_RIGHT);
      }
      S.EndStatic();
      S.StartVerticalLay(0);
      {
         S.Id(UpButtonID).AddButton(_("Move &Up"), wxALIGN_LEFT);
         S.Id(DownButtonID).AddButton(_("Move &Down"), wxALIGN_LEFT);
         S.Id(RenameButtonID).AddButton(_("&Rename..."), wxALIGN_LEFT);
         S.Id(DeleteButtonID).AddButton(_("D&elete..."), wxALIGN_LEFT);
         S.Id(ImportButtonID).AddButton(_("I&mport..."), wxALIGN_LEFT);
         S.Id(ExportButtonID).AddButton(_("E&xport..."), wxALIGN_LEFT);
         S.Id(LibraryButtonID).AddButton(_("&Get More..."), wxALIGN_LEFT);
         S.Id(DefaultsButtonID).AddButton(_("De&faults"), wxALIGN_LEFT);
      }
      S.EndVerticalLay();
   }
   S.EndHorizontalLay();
   S.AddStandardButtons();
   S.StartStatic(_("Help"));
   S.AddConstTextBox( {}, _("Rename 'unnamed' to save a new entry.\n'OK' saves all changes, 'Cancel' doesn't."));
   S.EndStatic();
   PopulateList(mPosition);
   Fit();

   return;
}

void EditCurvesDialog::PopulateList(int position)
{
   mList->DeleteAllItems();
   for (unsigned int i = 0; i < mEditCurves.size(); i++)
      mList->InsertItem(i, mEditCurves[i].Name);
   mList->SetColumnWidth(0, wxLIST_AUTOSIZE);
   int curvesWidth = mList->GetColumnWidth(0);
   mList->SetColumnWidth(0, wxLIST_AUTOSIZE_USEHEADER);
   int headerWidth = mList->GetColumnWidth(0);
   mList->SetColumnWidth(0, wxMax(headerWidth, curvesWidth));
   // use 'position' to set focus
   mList->EnsureVisible(position);
   mList->SetItemState(position, wxLIST_STATE_SELECTED|wxLIST_STATE_FOCUSED, wxLIST_STATE_SELECTED|wxLIST_STATE_FOCUSED);
}

void EditCurvesDialog::OnUp(wxCommandEvent & WXUNUSED(event))
{
   long item = mList->GetNextItem(-1, wxLIST_NEXT_ALL, wxLIST_STATE_SELECTED);
   if ( item == -1 )
      return;  // no items selected
   if( item == 0 )
      item = mList->GetNextItem(item, wxLIST_NEXT_ALL, wxLIST_STATE_SELECTED); // top item selected, can't move up
   int state;
   while( item != -1 )
   {
      if ( item == mList->GetItemCount()-1)
      {  // 'unnamed' always stays at the bottom
         mEffect->Effect::MessageBox(_("'unnamed' always stays at the bottom of the list"),
                            Effect::DefaultMessageBoxStyle,
                            _("'unnamed' is special"));   // these could get tedious!
         return;
      }
      state = mList->GetItemState(item-1, wxLIST_STATE_SELECTED);
      if ( state != wxLIST_STATE_SELECTED )
      { // swap this with one above but only if it isn't selected
         EQCurve temp(wxT("temp"));
         temp.Name = mEditCurves[item].Name;
         temp.points = mEditCurves[item].points;
         mEditCurves[item].Name = mEditCurves[item-1].Name;
         mEditCurves[item].points = mEditCurves[item-1].points;
         mEditCurves[item-1].Name = temp.Name;
         mEditCurves[item-1].points = temp.points;
         wxString sTemp = mList->GetItemText(item);
         mList->SetItem(item, 0, mList->GetItemText(item-1));
         mList->SetItem(item-1, 0, sTemp);
         mList->SetItemState(item, 0, wxLIST_STATE_SELECTED);
         mList->SetItemState(item-1, wxLIST_STATE_SELECTED, wxLIST_STATE_SELECTED);
      }
      item = mList->GetNextItem(item, wxLIST_NEXT_ALL, wxLIST_STATE_SELECTED);
   }
}

void EditCurvesDialog::OnDown(wxCommandEvent & WXUNUSED(event))
{  // looks harder than OnUp as we need to seek backwards up the list, hence GetPreviousItem
   long item = GetPreviousItem(mList->GetItemCount());
   if( item == -1 )
      return;  // nothing selected
   int state;
   while( item != -1 )
   {
      if( (item != mList->GetItemCount()-1) && (item != mList->GetItemCount()-2) )
      {  // can't move 'unnamed' down, or the one above it
         state = mList->GetItemState(item+1, wxLIST_STATE_SELECTED);
         if ( state != wxLIST_STATE_SELECTED )
         { // swap this with one below but only if it isn't selected
            EQCurve temp(wxT("temp"));
            temp.Name = mEditCurves[item].Name;
            temp.points = mEditCurves[item].points;
            mEditCurves[item].Name = mEditCurves[item+1].Name;
            mEditCurves[item].points = mEditCurves[item+1].points;
            mEditCurves[item+1].Name = temp.Name;
            mEditCurves[item+1].points = temp.points;
            wxString sTemp = mList->GetItemText(item);
            mList->SetItem(item, 0, mList->GetItemText(item+1));
            mList->SetItem(item+1, 0, sTemp);
            mList->SetItemState(item, 0, wxLIST_STATE_SELECTED);
            mList->SetItemState(item+1, wxLIST_STATE_SELECTED, wxLIST_STATE_SELECTED);
         }
      }
      item = GetPreviousItem(item);
   }
}

long EditCurvesDialog::GetPreviousItem(long item)  // wx doesn't have this
{
   long lastItem = -1;
   long itemTemp = mList->GetNextItem(-1, wxLIST_NEXT_ALL,
      wxLIST_STATE_SELECTED);
   while( (itemTemp != -1) && (itemTemp < item) )
   {
      lastItem = itemTemp;
      itemTemp = mList->GetNextItem(itemTemp, wxLIST_NEXT_ALL, wxLIST_STATE_SELECTED);
   }
   return lastItem;
}

// Rename curve/curves
void EditCurvesDialog::OnRename(wxCommandEvent & WXUNUSED(event))
{
   wxString name;
   int numCurves = mEditCurves.size();
   int curve = 0;

   // Setup list of characters that aren't allowed
   wxArrayString exclude;
   exclude.Add( wxT("<") );
   exclude.Add( wxT(">") );
   exclude.Add( wxT("'") );
   exclude.Add( wxT("\"") );

   // Get the first one to be renamed
   long item = mList->GetNextItem(-1, wxLIST_NEXT_ALL, wxLIST_STATE_SELECTED);
   long firstItem = item;  // for reselection with PopulateList
   while(item >= 0)
   {
      // Prompt the user until a valid name is enter or cancelled
      bool overwrite = false;
      bool bad = true;
      while( bad )   // Check for an unacceptable duplicate
      {   // Show the dialog and bail if the user cancels
         bad = false;
         // build the dialog
         AudacityTextEntryDialog dlg( this,
            wxString::Format( _("Rename '%s' to..."), mEditCurves[ item ].Name ),
            _("Rename...") );
         dlg.SetTextValidator( wxFILTER_EXCLUDE_CHAR_LIST );
         dlg.SetName(
            wxString::Format( _("Rename '%s'"), mEditCurves[ item ].Name ) );
         wxTextValidator *tv = dlg.GetTextValidator();
         tv->SetExcludes( exclude );   // Tell the validator about excluded chars
         if( dlg.ShowModal() == wxID_CANCEL )
         {
            bad = true;
            break;
         }

         // Extract the name from the dialog
         name = dlg.GetValue();

         // Search list of curves for a duplicate name
         for( curve = 0; curve < numCurves; curve++ )
         {
            wxString temp = mEditCurves[ curve ].Name;
            if( name.IsSameAs( mEditCurves[ curve ].Name )) // case sensitive
            {
               bad = true;
               if( curve == item )  // trying to rename a curve with the same name
               {
                  mEffect->Effect::MessageBox( _("Name is the same as the original one"), wxOK, _("Same name") );
                  break;
               }
               int answer = mEffect->Effect::MessageBox(
                  wxString::Format( _("Overwrite existing curve '%s'?"), name ),
                  wxYES_NO, _("Curve exists") );
               if (answer == wxYES)
               {
                  bad = false;
                  overwrite = true; // we are going to overwrite the one with this name
                  break;
               }
            }
         }
         if( name == wxT("") || name == wxT("unnamed") )
            bad = true;
      }

      // if bad, we cancelled the rename dialog, so nothing to do.
      if( bad == true )
         ;
      else if(overwrite){
         // Overwrite another curve.
         // JKC: because 'overwrite' is true, 'curve' is the number of the curve that
         // we are about to overwrite.
         mEditCurves[ curve ].Name = name;
         mEditCurves[ curve ].points = mEditCurves[ item ].points;
         // if renaming the unnamed item, then select it,
         // otherwise get rid of the item we've renamed.
         if( item == (numCurves-1) )
            mList->SetItem(curve, 0, name);
         else
         {
            mEditCurves.erase( mEditCurves.begin() + item );
            numCurves--;
         }
      }
      else if( item == (numCurves-1) ) // renaming 'unnamed'
      {  // Create a NEW entry
         mEditCurves.push_back( EQCurve( wxT("unnamed") ) );
         // Copy over the points
         mEditCurves[ numCurves ].points = mEditCurves[ numCurves - 1 ].points;
         // Give the original unnamed entry the NEW name
         mEditCurves[ numCurves - 1 ].Name = name;
         numCurves++;
      }
      else  // just rename (the 'normal' case)
      {
         mEditCurves[ item ].Name = name;
         mList->SetItem(item, 0, name);
      }
      // get next selected item
      item = mList->GetNextItem(item, wxLIST_NEXT_ALL, wxLIST_STATE_SELECTED);
   }

   PopulateList(firstItem);  // Note: only saved to file when you OK out of the dialog
   return;
}

// Delete curve/curves
void EditCurvesDialog::OnDelete(wxCommandEvent & WXUNUSED(event))
{
   // We could could count them here
   // And then put in a 'Delete N items?' prompt.

#if 0 // 'one at a time' prompt code
   // Get the first one to be deleted
   long item = mList->GetNextItem(-1, wxLIST_NEXT_ALL, wxLIST_STATE_SELECTED);
   // Take care, mList and mEditCurves will get out of sync as curves are deleted
   int deleted = 0;
   long highlight = -1;

   while(item >= 0)
   {
      if(item == mList->GetItemCount()-1)   //unnamed
      {
         mEffect->Effect::MessageBox(_("You cannot delete the 'unnamed' curve."),
             wxOK | wxCENTRE, _("Can't delete 'unnamed'"));
      }
      else
      {
         // Create the prompt
         wxString quest;
         quest = wxString::Format(_("Delete '%s'?"),
                                  mEditCurves[ item-deleted ].Name);

         // Ask for confirmation before removal
         int ans = mEffect->Effect::MessageBox( quest, wxYES_NO | wxCENTRE, _("Confirm Deletion") );
         if( ans == wxYES )
         {  // Remove the curve from the array
            mEditCurves.RemoveAt( item-deleted );
            deleted++;
         }
         else
            highlight = item-deleted;  // if user presses 'No', select that curve
      }
      // get next selected item
      item = mList->GetNextItem(item, wxLIST_NEXT_ALL, wxLIST_STATE_SELECTED);
   }

   if(highlight == -1)
      PopulateList(mEditCurves.GetCount()-1);   // set 'unnamed' as the selected curve
   else
      PopulateList(highlight);   // user said 'No' to deletion
#else // 'DELETE all N' code
   int count = mList->GetSelectedItemCount();
   long item = mList->GetNextItem(-1, wxLIST_NEXT_ALL, wxLIST_STATE_SELECTED);
   // Create the prompt
   wxString quest;
   if( count > 1 )
      quest = wxString::Format(_("Delete %d items?"), count);
   else
      if( count == 1 )
         quest = wxString::Format(_("Delete '%s'?"), mEditCurves[ item ].Name);
      else
         return;
   // Ask for confirmation before removal
   int ans = mEffect->Effect::MessageBox( quest, wxYES_NO | wxCENTRE, _("Confirm Deletion") );
   if( ans == wxYES )
   {  // Remove the curve(s) from the array
      // Take care, mList and mEditCurves will get out of sync as curves are deleted
      int deleted = 0;
      while(item >= 0)
      {
         // TODO: Migrate to the standard "Manage" dialog.
         if(item == mList->GetItemCount()-1)   //unnamed
         {
            mEffect->Effect::MessageBox(_("You cannot delete the 'unnamed' curve, it is special."),
                                        Effect::DefaultMessageBoxStyle,
                                        _("Can't delete 'unnamed'"));
         }
         else
         {
            mEditCurves.erase( mEditCurves.begin() + item - deleted );
            deleted++;
         }
         item = mList->GetNextItem(item, wxLIST_NEXT_ALL, wxLIST_STATE_SELECTED);
      }
      PopulateList(mEditCurves.size() - 1);   // set 'unnamed' as the selected curve
   }
#endif
}

void EditCurvesDialog::OnImport( wxCommandEvent & WXUNUSED(event))
{
   FileDialogWrapper filePicker(this, _("Choose an EQ curve file"), FileNames::DataDir(), wxT(""), _("xml files (*.xml;*.XML)|*.xml;*.XML"));
   wxString fileName = wxT("");
   if( filePicker.ShowModal() == wxID_CANCEL)
      return;
   else
      fileName = filePicker.GetPath();
   // Use EqualizationDialog::LoadCurves to read into (temporary) mEditCurves
   // This may not be the best OOP way of doing it, but I don't know better (MJS)
   EQCurveArray temp;
   temp = mEffect->mCurves;   // temp copy of the main dialog curves
   mEffect->mCurves = mEditCurves;  // copy EditCurvesDialog to main interface
   mEffect->LoadCurves(fileName, true);   // use main interface to load imported curves
   mEditCurves = mEffect->mCurves;  // copy back to this interface
   mEffect->mCurves = temp;   // and reset the main interface how it was
   PopulateList(0);  // update the EditCurvesDialog dialog
   return;
}

void EditCurvesDialog::OnExport( wxCommandEvent & WXUNUSED(event))
{
   FileDialogWrapper filePicker(this, _("Export EQ curves as..."), FileNames::DataDir(), wxT(""), wxT("*.XML"), wxFD_SAVE | wxFD_OVERWRITE_PROMPT | wxRESIZE_BORDER);   // wxFD_CHANGE_DIR?
   wxString fileName = wxT("");
   if( filePicker.ShowModal() == wxID_CANCEL)
      return;
   else
      fileName = filePicker.GetPath();

   EQCurveArray temp;
   temp = mEffect->mCurves;   // backup the parent's curves
   EQCurveArray exportCurves;   // Copy selected curves to export
   exportCurves.clear();
   long item = mList->GetNextItem(-1, wxLIST_NEXT_ALL, wxLIST_STATE_SELECTED);
   int i=0;
   while(item >= 0)
   {
      if(item != mList->GetItemCount()-1)   // not 'unnamed'
      {
         exportCurves.push_back(mEditCurves[item].Name);
         exportCurves[i].points = mEditCurves[item].points;
         i++;
      }
      else
         mEffect->Effect::MessageBox(_("You cannot export 'unnamed' curve, it is special."),
                            Effect::DefaultMessageBoxStyle,
                            _("Cannot Export 'unnamed'"));
      // get next selected item
      item = mList->GetNextItem(item, wxLIST_NEXT_ALL, wxLIST_STATE_SELECTED);
   }
   if(i>0)
   {
      mEffect->mCurves = exportCurves;
      mEffect->SaveCurves(fileName);
      mEffect->mCurves = temp;
      wxString message;
      message.Printf(_("%d curves exported to %s"), i, fileName);
      mEffect->Effect::MessageBox(message,
                                  Effect::DefaultMessageBoxStyle,
                                  _("Curves exported"));
   }
   else
      mEffect->Effect::MessageBox(_("No curves exported"),
                                  Effect::DefaultMessageBoxStyle,
                                  _("No curves exported"));
}

void EditCurvesDialog::OnLibrary( wxCommandEvent & WXUNUSED(event))
{
   // full path to wiki.
   wxLaunchDefaultBrowser(wxT("https://wiki.audacityteam.org/wiki/EQCurvesDownload"));
}

void EditCurvesDialog::OnDefaults( wxCommandEvent & WXUNUSED(event))
{
   EQCurveArray temp;
   temp = mEffect->mCurves;
   // we expect this to fail in LoadCurves (due to a lack of path) and handle that there
   mEffect->LoadCurves( wxT("EQDefaultCurves.xml") );
   mEditCurves = mEffect->mCurves;
   mEffect->mCurves = temp;
   PopulateList(0);  // update the EditCurvesDialog dialog
}

void EditCurvesDialog::OnOK(wxCommandEvent & WXUNUSED(event))
{
   // Make a backup of the current curves
   wxString backupPlace = wxFileName( FileNames::DataDir(), wxT("EQBackup.xml") ).GetFullPath();
   mEffect->SaveCurves(backupPlace);
   // Load back into the main dialog
   mEffect->mCurves.clear();
   for (unsigned int i = 0; i < mEditCurves.size(); i++)
   {
      mEffect->mCurves.push_back(mEditCurves[i].Name);
      mEffect->mCurves[i].points = mEditCurves[i].points;
   }
   mEffect->SaveCurves();
   mEffect->LoadCurves();
//   mEffect->CreateChoice();
   wxGetTopLevelParent(mEffect->mUIParent)->Layout();
//   mEffect->mUIParent->Layout();

   // Select something sensible
   long item = mList->GetNextItem(-1,
      wxLIST_NEXT_ALL,
      wxLIST_STATE_SELECTED);
   if (item == -1)
      item = mList->GetItemCount()-1;   // nothing selected, default to 'unnamed'
   mEffect->setCurve(item);
   EndModal(true);
}

void EditCurvesDialog::OnListSelectionChange( wxListEvent & )
{
   const bool enable = mList->GetSelectedItemCount() > 0;
   static const int ids[] = {
      UpButtonID,
      DownButtonID,
      RenameButtonID,
      DeleteButtonID,
   };
   for (auto id : ids)
      FindWindowById(id, this)->Enable(enable);
}

#if wxUSE_ACCESSIBILITY

SliderAx::SliderAx(wxWindow * window, const wxString &fmt) :
WindowAccessible( window )
{
   mParent = window;
   mFmt = fmt;
}

SliderAx::~SliderAx()
{
}

// Retrieves the address of an IDispatch interface for the specified child.
// All objects must support this property.
wxAccStatus SliderAx::GetChild( int childId, wxAccessible** child )
{
   if( childId == wxACC_SELF )
   {
      *child = this;
   }
   else
   {
      *child = NULL;
   }

   return wxACC_OK;
}

// Gets the number of children.
wxAccStatus SliderAx::GetChildCount(int* childCount)
{
   *childCount = 3;

   return wxACC_OK;
}

// Gets the default action for this object (0) or > 0 (the action for a child).
// Return wxACC_OK even if there is no action. actionName is the action, or the empty
// string if there is no action.
// The retrieved string describes the action that is performed on an object,
// not what the object does as a result. For example, a toolbar button that prints
// a document has a default action of "Press" rather than "Prints the current document."
wxAccStatus SliderAx::GetDefaultAction( int WXUNUSED(childId), wxString *actionName )
{
   actionName->Clear();

   return wxACC_OK;
}

// Returns the description for this object or a child.
wxAccStatus SliderAx::GetDescription( int WXUNUSED(childId), wxString *description )
{
   description->Clear();

   return wxACC_OK;
}

// Gets the window with the keyboard focus.
// If childId is 0 and child is NULL, no object in
// this subhierarchy has the focus.
// If this object has the focus, child should be 'this'.
wxAccStatus SliderAx::GetFocus(int* childId, wxAccessible** child)
{
   *childId = 0;
   *child = this;

   return wxACC_OK;
}

// Returns help text for this object or a child, similar to tooltip text.
wxAccStatus SliderAx::GetHelpText( int WXUNUSED(childId), wxString *helpText )
{
   helpText->Clear();

   return wxACC_OK;
}

// Returns the keyboard shortcut for this object or child.
// Return e.g. ALT+K
wxAccStatus SliderAx::GetKeyboardShortcut( int WXUNUSED(childId), wxString *shortcut )
{
   shortcut->Clear();

   return wxACC_OK;
}

// Returns the rectangle for this object (id = 0) or a child element (id > 0).
// rect is in screen coordinates.
wxAccStatus SliderAx::GetLocation( wxRect& rect, int WXUNUSED(elementId) )
{
   wxSlider *s = wxDynamicCast( GetWindow(), wxSlider );

   rect = s->GetRect();
   rect.SetPosition( s->GetParent()->ClientToScreen( rect.GetPosition() ) );

   return wxACC_OK;
}

// Gets the name of the specified object.
wxAccStatus SliderAx::GetName(int WXUNUSED(childId), wxString* name)
{
   wxSlider *s = wxDynamicCast( GetWindow(), wxSlider );

   *name = s->GetName();

   return wxACC_OK;
}

// Returns a role constant.
wxAccStatus SliderAx::GetRole(int childId, wxAccRole* role)
{
   switch( childId )
   {
   case 0:
      *role = wxROLE_SYSTEM_SLIDER;
      break;

   case 1:
   case 3:
      *role = wxROLE_SYSTEM_PUSHBUTTON;
      break;

   case 2:
      *role = wxROLE_SYSTEM_INDICATOR;
      break;
   }

   return wxACC_OK;
}

// Gets a variant representing the selected children
// of this object.
// Acceptable values:
// - a null variant (IsNull() returns TRUE)
// - a list variant (GetType() == wxT("list"))
// - an integer representing the selected child element,
//   or 0 if this object is selected (GetType() == wxT("long"))
// - a "void*" pointer to a wxAccessible child object
wxAccStatus SliderAx::GetSelections( wxVariant * WXUNUSED(selections) )
{
   return wxACC_NOT_IMPLEMENTED;
}

// Returns a state constant.
wxAccStatus SliderAx::GetState(int childId, long* state)
{
   wxSlider *s = wxDynamicCast( GetWindow(), wxSlider );

   switch( childId )
   {
   case 0:
      *state = wxACC_STATE_SYSTEM_FOCUSABLE;
      break;

   case 1:
      if( s->GetValue() == s->GetMin() )
      {
         *state = wxACC_STATE_SYSTEM_INVISIBLE;
      }
      break;

   case 3:
      if( s->GetValue() == s->GetMax() )
      {
         *state = wxACC_STATE_SYSTEM_INVISIBLE;
      }
      break;
   }

   // Do not use mSliderIsFocused is not set until after this method
   // is called.
   *state |= ( s == wxWindow::FindFocus() ? wxACC_STATE_SYSTEM_FOCUSED : 0 );

   return wxACC_OK;
}

// Returns a localized string representing the value for the object
// or child.
wxAccStatus SliderAx::GetValue(int childId, wxString* strValue)
{
   wxSlider *s = wxDynamicCast( GetWindow(), wxSlider );

   if( childId == 0 )
   {
      strValue->Printf( mFmt, s->GetValue() );

      return wxACC_OK;
   }

   return wxACC_NOT_SUPPORTED;
}

#endif