Add spectrogram preference migration from old 'Grayscale' checkbox to new 'Color Scheme' choice

src/commands/SetTrackInfoCommand.cpp

@@ -445,7 +445,7 @@ bool SetTrackVisualsCommand::ApplyInner(const CommandContext & context, Track *
       wt->GetSpectrogramSettings().spectralSelection = bSpectralSelect;
    }
    if (wt && bHasSpecColorScheme) {
-      wt->GetSpectrogramSettings().colorScheme = mSpecColorScheme;
+      wt->GetSpectrogramSettings().colorScheme = (SpectrogramSettings::ColorScheme)mSpecColorScheme;
    }
 
    return true;

src/prefs/SpectrogramSettings.cpp

@@ -176,6 +176,26 @@ const EnumValueSymbols &SpectrogramSettings::GetColorSchemeNames()
    return result;
 }
 
+
+void SpectrogramSettings::ColorSchemeEnumSetting::Migrate(wxString &value)
+{
+   // Migrate old grayscale option to Color scheme choice
+   bool isGrayscale = (gPrefs->Read(wxT("/Spectrum/Grayscale"), 0L) != 0);
+   if (isGrayscale && !gPrefs->Read(wxT("/Spectrum/ColorScheme"), &value)) {
+      value = GetColorSchemeNames().at(csInvGrayscale).Internal();
+      Write(value);
+      gPrefs->Flush();
+   }
+}
+
+SpectrogramSettings::ColorSchemeEnumSetting SpectrogramSettings::colorSchemeSetting{
+   wxT("/Spectrum/ColorScheme"),
+   GetColorSchemeNames(),
+   csColorNew, // default to Color(New)
+   { csColorNew, csColorTheme, csGrayscale, csInvGrayscale },
+};
+
+
 //static
 const TranslatableStrings &SpectrogramSettings::GetAlgorithmNames()
 {
@@ -249,7 +269,9 @@ bool SpectrogramSettings::Validate(bool quiet)
       ScaleType(std::max(0,
          std::min((int)(SpectrogramSettings::stNumScaleTypes) - 1,
             (int)(scaleType))));
-   colorScheme = std::max(0, std::min(csNumColorScheme-1, colorScheme));
+   colorScheme = ColorScheme(
+      std::max(0, std::min<int>(csNumColorScheme-1, colorScheme))
+   );
    algorithm = Algorithm(
       std::max(0, std::min((int)(algNumAlgorithms) - 1, (int)(algorithm)))
    );
@@ -277,7 +299,7 @@ void SpectrogramSettings::LoadPrefs()
 
    gPrefs->Read(wxT("/Spectrum/WindowType"), &windowType, eWinFuncHann);
 
-   colorScheme = ColorScheme(gPrefs->Read(wxT("/Spectrum/ColorScheme"), 0L));
+   colorScheme = colorSchemeSetting.ReadEnum();
 
    scaleType = ScaleType(gPrefs->Read(wxT("/Spectrum/ScaleType"), 0L));
 
@@ -325,7 +347,7 @@ void SpectrogramSettings::SavePrefs()
 
    gPrefs->Write(wxT("/Spectrum/WindowType"), windowType);
 
-   gPrefs->Write(wxT("/Spectrum/ColorScheme"), (int) colorScheme);
+   colorSchemeSetting.WriteEnum(colorScheme);
 
    gPrefs->Write(wxT("/Spectrum/ScaleType"), (int) scaleType);
 
@@ -385,9 +407,7 @@ void SpectrogramSettings::UpdatePrefs()
    }
 
    if (colorScheme == defaults().colorScheme) {
-      int temp;
-      gPrefs->Read(wxT("/Spectrum/ColorScheme"), &temp, 0L);
-      colorScheme = ColorScheme(temp);
+      colorScheme = colorSchemeSetting.ReadEnum();
    }
 
    if (scaleType == defaults().scaleType) {

src/prefs/SpectrogramSettings.h

@@ -129,8 +129,7 @@ public:
    size_t GetFFTLength() const; // window size (times zero padding, if STFT)
    size_t NBins() const;
 
-   typedef int ColorScheme;
-   enum ColorSchemeValues : int {
+   enum ColorScheme : int {
       // Keep in correspondence with AColor::colorSchemes, AColor::gradient_pre
       csColorNew = 0,
       csColorTheme,
@@ -141,6 +140,12 @@ public:
    };
    ColorScheme colorScheme;
 
+   class ColorSchemeEnumSetting : public EnumSetting< ColorScheme > {
+       using EnumSetting< ColorScheme >::EnumSetting;
+       void Migrate(wxString &value) override;
+   };
+   static ColorSchemeEnumSetting colorSchemeSetting;
+
    ScaleType scaleType;
 
 #ifndef SPECTRAL_SELECTION_GLOBAL_SWITCH

src/prefs/SpectrumPrefs.cpp

@@ -225,7 +225,7 @@ void SpectrumPrefs::PopulateOrExchange(ShuttleGui & S)
                8);
 
             S.Id(ID_COLOR_SCHEME).TieChoice(XXO("Color Sche&me:"),
-               mTempSettings.colorScheme,
+               (int&)mTempSettings.colorScheme,
                Msgids( SpectrogramSettings::GetColorSchemeNames() ) );
          }
          S.EndMultiColumn();