Dynamic registry of sub-views replaces exhaustive switches on type...

... Such switches were in the TCP context menu for wave tracks,
SetTrackVisualsCommand, Nyquist (choosing the string for 'view property of
*tracks*), and the Tracks preferences panel.

This will allow easier, non-intrusive addition of other kinds of track
visualizations.

include/audacity/ComponentInterface.h

@@ -87,9 +87,10 @@ public:
 
    const wxString &Internal() const { return mInternal; }
    const TranslatableString &Msgid() const { return mMsgid; }
+   const TranslatableString Stripped() const { return mMsgid.Stripped(); }
    const wxString Translation() const { return mMsgid.Translation(); }
    const wxString StrippedTranslation() const
-      { return mMsgid.Stripped().Translation(); }
+      { return Stripped().Translation(); }
 
    bool empty() const { return mInternal.empty(); }
 

include/audacity/Types.h

@@ -467,6 +467,8 @@ public:
    TranslatableString Stripped( unsigned options = MenuCodes ) const
    { return TranslatableString{ *this }.Strip( options ); }
 
+   wxString StrippedTranslation() const { return Stripped().Translation(); }
+
 private:
    static const Formatter NullContextFormatter;
 

src/Prefs.h

@@ -214,7 +214,7 @@ public:
       EnumValueSymbols symbols,
       long defaultSymbol,
 
-      std::initializer_list< Enum > values, // must have same size as symbols
+      std::vector< Enum > values, // must have same size as symbols
       const wxString &oldKey = {}
    )
       : EnumSettingBase{

src/ShuttleGui.cpp

@@ -402,7 +402,7 @@ wxChoice * ShuttleGuiBase::AddChoice( const TranslatableString &Prompt,
       wxDefaultPosition,
       wxDefaultSize,
       transform_container<wxArrayString>(
-         choices, std::mem_fn( &TranslatableString::Translation ) ),
+         choices, std::mem_fn( &TranslatableString::StrippedTranslation ) ),
       GetStyle( 0 ) );
 
    pChoice->SetMinSize( { 180, -1 } );// Use -1 for 'default size' - Platform specific.
@@ -2421,7 +2421,7 @@ void ShuttleGui::SetMinSize( wxWindow *window, const TranslatableStrings & items
 {
    SetMinSize( window,
       transform_container<wxArrayStringEx>(
-         items, std::mem_fn( &TranslatableString::Translation ) ) );
+         items, std::mem_fn( &TranslatableString::StrippedTranslation ) ) );
 }
 
 void ShuttleGui::SetMinSize( wxWindow *window, const wxArrayStringEx & items )

src/commands/SetTrackInfoCommand.cpp

@@ -248,20 +248,6 @@ static const EnumValueSymbol kColourStrings[nColours] =
 };
 
 
-enum kDisplayTypes
-{
-   kWaveform,
-   kSpectrogram,
-   nDisplayTypes
-};
-
-static const EnumValueSymbol kDisplayTypeStrings[nDisplayTypes] =
-{
-   // These are acceptable dual purpose internal/visible names
-   { XO("Waveform") },
-   { XO("Spectrogram") },
-};
-
 enum kScaleTypes
 {
    kLinear,
@@ -292,10 +278,22 @@ static const EnumValueSymbol kZoomTypeStrings[nZoomTypes] =
    { XO("HalfWave") },
 };
 
+static EnumValueSymbols DiscoverSubViewTypes()
+{
+   const auto &types = WaveTrackSubView::AllTypes();
+   return transform_container< EnumValueSymbols >(
+      types, std::mem_fn( &WaveTrackSubView::Type::name ) );
+}
+
 bool SetTrackVisualsCommand::DefineParams( ShuttleParams & S ){ 
    SetTrackBase::DefineParams( S );
    S.OptionalN( bHasHeight         ).Define(     mHeight,         wxT("Height"),     120, 44, 2000 );
-   S.OptionalN( bHasDisplayType    ).DefineEnum( mDisplayType,    wxT("Display"),    kWaveform, kDisplayTypeStrings, nDisplayTypes );
+
+   {
+      auto symbols = DiscoverSubViewTypes();
+      S.OptionalN( bHasDisplayType    ).DefineEnum( mDisplayType,    wxT("Display"),    0, symbols.data(), symbols.size() );
+   }
+
    S.OptionalN( bHasScaleType      ).DefineEnum( mScaleType,      wxT("Scale"),      kLinear,   kScaleTypeStrings, nScaleTypes );
    S.OptionalN( bHasColour         ).DefineEnum( mColour,         wxT("Color"),      kColour0,  kColourStrings, nColours );
    S.OptionalN( bHasVZoom          ).DefineEnum( mVZoom,          wxT("VZoom"),      kReset,    kZoomTypeStrings, nZoomTypes );
@@ -318,8 +316,15 @@ void SetTrackVisualsCommand::PopulateOrExchange(ShuttleGui & S)
       S.Optional( bHasHeight      ).TieNumericTextBox(  XO("Height:"),        mHeight );
       S.Optional( bHasColour      ).TieChoice(          XO("Color:"),         mColour,
          Msgids(  kColourStrings, nColours ) );
-      S.Optional( bHasDisplayType ).TieChoice(          XO("Display:"),       mDisplayType,
+      
-         Msgids( kDisplayTypeStrings, nDisplayTypes ) );
+      {
+         auto symbols = DiscoverSubViewTypes();
+         auto typeNames = transform_container<TranslatableStrings>(
+             symbols, std::mem_fn( &EnumValueSymbol::Stripped ) );
+         S.Optional( bHasDisplayType ).TieChoice(          XO("Display:"),       mDisplayType,
+            typeNames );
+      }
+
       S.Optional( bHasScaleType   ).TieChoice(          XO("Scale:"),         mScaleType,
          Msgids( kScaleTypeStrings, nScaleTypes ) );
       S.Optional( bHasVZoom       ).TieChoice(          XO("VZoom:"),         mVZoom,
@@ -355,10 +360,7 @@ bool SetTrackVisualsCommand::ApplyInner(const CommandContext & context, Track *
 
    if( wt && bHasDisplayType  )
       WaveTrackView::Get( *wt ).SetDisplay(
-         (mDisplayType == kWaveform) ?
+         WaveTrackSubView::AllTypes()[ mDisplayType ].id );
-            WaveTrackViewConstants::Waveform
-            : WaveTrackViewConstants::Spectrum
-         );
    if( wt && bHasScaleType )
       wt->GetIndependentWaveformSettings().scaleType = 
          (mScaleType==kLinear) ? 

src/effects/nyquist/Nyquist.cpp

@@ -551,9 +551,10 @@ bool NyquistEffect::Init()
       for ( auto t :
                TrackList::Get( *project ).Selected< const WaveTrack >() ) {
          const auto displays = WaveTrackView::Get(*t).GetDisplays();
-         bool hasSpectral =
+         bool hasSpectral = (displays.end() != std::find(
-            make_iterator_range( displays.begin(), displays.end())
+            displays.begin(), displays.end(),
-               .contains( WaveTrackViewConstants::Spectrum );
+            WaveTrackSubView::Type{ WaveTrackViewConstants::Spectrum, {} }
+         ) );
          if ( !hasSpectral ||
              !(t->GetSpectrogramSettings().SpectralSelectionEnabled())) {
             bAllowSpectralEditing = false;
@@ -1090,21 +1091,16 @@ bool NyquistEffect::ProcessOne()
       wxString bitFormat;
       wxString spectralEditp;
 
-      using namespace WaveTrackViewConstants;
       mCurTrack[0]->TypeSwitch(
          [&](const WaveTrack *wt) {
             type = wxT("wave");
             spectralEditp = mCurTrack[0]->GetSpectrogramSettings().SpectralSelectionEnabled()? wxT("T") : wxT("NIL");
             auto displays = WaveTrackView::Get( *wt ).GetDisplays();
-            auto format = [&]( decltype(displays[0]) display ){
+            auto format = [&]( decltype(displays[0]) display ) {
-               switch ( display )
+               // Get the English name of the view type, without menu codes,
-               {
+               // as a string that Lisp can examine
-               case Waveform:
+               return wxString::Format( wxT("\"%s\""),
-                  return wxT("\"Waveform\"");
+                  display.name.Stripped().Debug() );
-               case Spectrum:
-                  return wxT("\"Spectrogram\"");
-               default: return wxT("NIL");
-               }
             };
             if (displays.empty())
                view = wxT("NIL");

src/menus/SelectMenus.cpp

@@ -36,8 +36,11 @@ void DoNextPeakFrequency(AudacityProject &project, bool up)
    const WaveTrack *pTrack {};
    for ( auto wt : tracks.Selected< const WaveTrack >() ) {
       const auto displays = WaveTrackView::Get( *wt ).GetDisplays();
-      if ( make_iterator_range( displays.begin(), displays.end() )
+      bool hasSpectrum = (displays.end() != std::find(
-         .contains( WaveTrackViewConstants::Spectrum) ) {
+         displays.begin(), displays.end(),
+         WaveTrackSubView::Type{ WaveTrackViewConstants::Spectrum, {} }
+      ) );
+      if ( hasSpectrum ) {
          pTrack = wt;
          break;
       }

src/prefs/TracksPrefs.cpp

@@ -27,6 +27,7 @@
 
 #include "../Prefs.h"
 #include "../ShuttleGui.h"
+#include "../tracks/playabletrack/wavetrack/ui/WaveTrackView.h"
 
 int TracksPrefs::iPreferencePinned = -1;
 
@@ -81,8 +82,6 @@ namespace {
    const auto key2 = wxT("/GUI/DefaultViewModeChoice");
    const auto key3 = wxT("/GUI/DefaultViewModeChoiceNew");
 
-   const EnumValueSymbol waveformSymbol{ XO("Waveform") };
-   const EnumValueSymbol spectrumSymbol{ XO("Spectrogram") };
    const wxString obsoleteValue{ wxT("WaveformDB") };
 };
 
@@ -100,6 +99,9 @@ public:
       // to avoid confusing version 2.1.0 if it reads the preference file afterwards.
       // Prefer the NEW preference key if it is present
 
+      static const EnumValueSymbol waveformSymbol{ XO("Waveform") };
+      static const EnumValueSymbol spectrumSymbol{ XO("Spectrogram") };
+
       WaveTrackViewConstants::Display viewMode;
       int oldMode;
       wxString newValue;
@@ -143,23 +145,26 @@ public:
    }
 };
 
-static TracksViewModeEnumSetting viewModeSetting{
+static TracksViewModeEnumSetting viewModeSetting()
-   key3,
+{
-   {
+   // Do a delayed computation, so that registration of sub-view types completes
-      { waveformSymbol },
+   // first
-      { spectrumSymbol }
+   const auto &types = WaveTrackSubView::AllTypes();
-   },
+   auto symbols = transform_container< EnumValueSymbols >(
-   0, // Waveform
+      types, std::mem_fn( &WaveTrackSubView::Type::name ) );
-
+   auto ids = transform_container< std::vector< WaveTrackSubView::Display > >(
-   {
+      types, std::mem_fn( &WaveTrackSubView::Type::id ) );
-      WaveTrackViewConstants::Waveform,
+   return {
-      WaveTrackViewConstants::Spectrum
+      key3,
-   }
+      symbols,
-};
+      0, // Waveform
+      ids
+   };
+}
 
 WaveTrackViewConstants::Display TracksPrefs::ViewModeChoice()
 {
-   return viewModeSetting.ReadEnum();
+   return viewModeSetting().ReadEnum();
 }
 
 WaveformSettings::ScaleTypeValues TracksPrefs::WaveformScaleChoice()
@@ -344,7 +349,7 @@ void TracksPrefs::PopulateOrExchange(ShuttleGui & S)
 #endif
 
          S.TieChoice(XO("Default &view mode:"),
-                     viewModeSetting );
+                     viewModeSetting() );
 
          S.TieChoice(XO("Default Waveform scale:"),
                      waveformScaleSetting );

src/prefs/WaveformSettings.cpp

@@ -150,7 +150,7 @@ void WaveformSettings::NextHigherDBRange()
 const TranslatableStrings &WaveformSettings::GetScaleNames()
 {
    static const TranslatableStrings result{
-      // Keep in correspondence with enum WaveTrack::WaveTrackDisplay:
+      // Keep in correspondence with ScaleTypeValues:
       XO("Linear"),
       XO("dB"),
    };

src/tracks/playabletrack/wavetrack/ui/SpectrumView.cpp

@@ -30,6 +30,13 @@ Paul Licameli split from WaveTrackView.cpp
 #include <wx/dcmemory.h>
 #include <wx/graphics.h>
 
+static WaveTrackSubView::Type sType{
+   WaveTrackViewConstants::Spectrum,
+   { wxT("Spectrogram"), XO("&Spectrogram") }
+};
+
+static WaveTrackSubView::RegisteredType reg{ sType };
+
 SpectrumView::~SpectrumView() = default;
 
 bool SpectrumView::IsSpectral() const
@@ -73,9 +80,9 @@ void SpectrumView::DoSetMinimized( bool minimized )
    TrackView::DoSetMinimized( minimized );
 }
 
-WaveTrackViewConstants::Display SpectrumView::SubViewType() const
+auto SpectrumView::SubViewType() const -> const Type &
 {
-   return WaveTrackViewConstants::Spectrum;
+   return sType;
 }
 
 std::shared_ptr<TrackVRulerControls> SpectrumView::DoGetVRulerControls()

src/tracks/playabletrack/wavetrack/ui/SpectrumView.h

@@ -24,7 +24,7 @@ public:
    using WaveTrackSubView::WaveTrackSubView;
    ~SpectrumView() override;
 
-   virtual WaveTrackViewConstants::Display SubViewType() const override;
+   const Type &SubViewType() const override;
 
    std::shared_ptr<TrackVRulerControls> DoGetVRulerControls() override;
 

src/tracks/playabletrack/wavetrack/ui/WaveTrackControls.cpp

@@ -104,6 +104,8 @@ std::vector<UIHandlePtr> WaveTrackControls::HitTest
 }
 
 enum {
+   reserveDisplays = 100,
+
    OnRate8ID = 30000,      // <---
    OnRate11ID,             //    |
    OnRate16ID,             //    |
@@ -123,8 +125,9 @@ enum {
    OnFloatID,              // <---
 
    OnMultiViewID,
-   OnWaveformID,
+
-   OnSpectrumID,
+   OnSetDisplayId, lastDisplayId = (OnSetDisplayId + reserveDisplays - 1),
+
    OnSpectrogramSettingsID,
 
    OnChannelLeftID,
@@ -620,6 +623,16 @@ void WaveTrackMenuTable::InitUserData(void *pUserData)
    mpData = static_cast<PlayableTrackControls::InitMenuData*>(pUserData);
 }
 
+static WaveTrackSubView::Types AllTypes()
+{
+   auto result = WaveTrackSubView::AllTypes();
+   if ( result.size() > reserveDisplays ) {
+      wxASSERT( false );
+      result.resize( reserveDisplays );
+   }
+   return result;
+}
+
 void WaveTrackMenuTable::InitMenu(Menu *pMenu)
 {
    WaveTrack *const pTrack = static_cast<WaveTrack*>(mpData->pTrack);
@@ -631,16 +644,40 @@ void WaveTrackMenuTable::InitMenu(Menu *pMenu)
    if (multiView)
       checkedIds.push_back( OnMultiViewID );
 
+   bool hasSpectrum = false;
    int uniqueDisplay = 0;
+   {
+      // Find the set of type ids of the shown displays, disregarding their
+      // top-to-bottom arrangement
+      auto displays = view.GetDisplays();
+      const auto end = displays.end();
+      auto iter = displays.begin();
+      std::sort( iter, end );
 
-   const auto displays = view.GetDisplays();
+      // Check the corresponding menu items, and decide which if any has
-   for ( auto display : displays ) {
+      // the unique check
-      auto id = (display == WaveTrackViewConstants::Waveform)
+      int displayId = OnSetDisplayId;
-         ? OnWaveformID
+      int nDisplays = 0;
-         : OnSpectrumID;
+      for ( const auto &type : AllTypes() ) {
-      checkedIds.push_back( id );
+         if ( iter != end && iter->id == type.id ) {
-      if ( displays.size() == 1 )
+            checkedIds.push_back( displayId );
-         uniqueDisplay = id;
+            uniqueDisplay = displayId;
+            ++iter;
+            ++nDisplays;
+
+            // Unfortunately this special knowledge of the Spectrum view type
+            // remains.  In future, either let a registry system insert this
+            // menu item, or (better) move it to the context menu of the
+            // Spectrum vertical ruler.
+            // (But the latter won't be satisfactory without a means to
+            // open that other context menu with keystrokes only, and that
+            // would require some notion of a focused sub-view.)
+            hasSpectrum = ( type.id == WaveTrackViewConstants::Spectrum );
+         }
+         ++displayId;
+      }
+      if ( nDisplays > 1 )
+         uniqueDisplay = 0;
    }
 
    if ( multiView && uniqueDisplay )
@@ -652,9 +689,6 @@ void WaveTrackMenuTable::InitMenu(Menu *pMenu)
    // We can't change them on the fly yet anyway.
    auto gAudioIO = AudioIOBase::Get();
    const bool bAudioBusy = gAudioIO->IsBusy();
-   bool hasSpectrum =
-      make_iterator_range( displays.begin(), displays.end() )
-         .contains( WaveTrackViewConstants::Spectrum );
    pMenu->Enable(OnSpectrogramSettingsID, hasSpectrum && !bAudioBusy);
 
    AudacityProject *const project = &mpData->project;
@@ -733,13 +767,14 @@ BEGIN_POPUP_MENU(WaveTrackMenuTable)
    if ( WaveTrackSubViews::slots() > 1 )
       POPUP_MENU_CHECK_ITEM(OnMultiViewID, XO("&Multi-view"), OnMultiView)
 
-   if ( view.GetMultiView() ) {
+   int id = OnSetDisplayId;
-      POPUP_MENU_CHECK_ITEM(OnWaveformID, XO("Wa&veform"), OnSetDisplay)
+   for ( const auto &type : AllTypes() ) {
-      POPUP_MENU_CHECK_ITEM(OnSpectrumID, XO("&Spectrogram"), OnSetDisplay)
+      if ( view.GetMultiView() ) {
-   }
+         POPUP_MENU_CHECK_ITEM(id++, type.name.Msgid(), OnSetDisplay)
-   else {
+      }
-      POPUP_MENU_RADIO_ITEM(OnWaveformID, XO("Wa&veform"), OnSetDisplay)
+      else {
-      POPUP_MENU_RADIO_ITEM(OnSpectrumID, XO("&Spectrogram"), OnSetDisplay)
+         POPUP_MENU_RADIO_ITEM(id++, type.name.Msgid(), OnSetDisplay)
+      }
    }
 
    POPUP_MENU_ITEM(OnSpectrogramSettingsID, XO("S&pectrogram Settings..."), OnSpectrogramSettings)
@@ -761,9 +796,10 @@ BEGIN_POPUP_MENU(WaveTrackMenuTable)
 
    if ( pTrack ) {
       const auto displays = view.GetDisplays();
-      bool hasWaveform =
+      bool hasWaveform = (displays.end() != std::find(
-         make_iterator_range( displays.begin(), displays.end() )
+         displays.begin(), displays.end(),
-            .contains( WaveTrackViewConstants::Waveform );
+         WaveTrackSubView::Type{ WaveTrackViewConstants::Waveform, {} }
+      ) );
       if( hasWaveform ){
          POPUP_MENU_SEPARATOR()
          POPUP_MENU_SUB_MENU(OnWaveColorID, XO("&Wave Color"), WaveColorMenuTable)
@@ -784,7 +820,7 @@ void WaveTrackMenuTable::OnMultiView(wxCommandEvent & event)
    bool multi = !view.GetMultiView();
    const auto &displays = view.GetDisplays();
    const auto display = displays.empty()
-      ? WaveTrackViewConstants::Waveform : *displays.begin();
+      ? WaveTrackViewConstants::Waveform : displays.begin()->id;
    for (const auto channel : TrackList::Channels(pTrack)) {
       auto &channelView = WaveTrackView::Get( *channel );
       channelView.SetMultiView( multi );
@@ -799,24 +835,18 @@ void WaveTrackMenuTable::OnMultiView(wxCommandEvent & event)
 ///  Set the Display mode based on the menu choice in the Track Menu.
 void WaveTrackMenuTable::OnSetDisplay(wxCommandEvent & event)
 {
-   using namespace WaveTrackViewConstants;
    int idInt = event.GetId();
-   wxASSERT(idInt >= OnWaveformID && idInt <= OnSpectrumID);
+   wxASSERT(idInt >= OnSetDisplayId &&
+            idInt <= lastDisplayId);
    const auto pTrack = static_cast<WaveTrack*>(mpData->pTrack);
 
-   WaveTrackView::WaveTrackDisplay id;
+   auto id = AllTypes()[ idInt - OnSetDisplayId ].id;
-   switch (idInt) {
-   default:
-   case OnWaveformID:
-      id = Waveform; break;
-   case OnSpectrumID:
-      id = Spectrum; break;
-   }
 
    auto &view = WaveTrackView::Get( *pTrack );
    if ( view.GetMultiView() ) {
       for (auto channel : TrackList::Channels(pTrack)) {
-         if ( !WaveTrackView::Get( *channel ).ToggleSubView( id ) ) {
+         if ( !WaveTrackView::Get( *channel )
+               .ToggleSubView( WaveTrackView::Display{ id } ) ) {
             // Trying to toggle off the last sub-view.  It was refused.
             // Decide what to do here.  Turn off multi-view instead?
             // PRL:  I don't agree that it makes sense
@@ -827,12 +857,13 @@ void WaveTrackMenuTable::OnSetDisplay(wxCommandEvent & event)
    }
    else {
       const auto displays = view.GetDisplays();
-      const bool wrongType = !(displays.size() == 1 && displays[0] == id);
+      const bool wrongType =
+         !(displays.size() == 1 && displays[0].id == id);
       if (wrongType) {
          for (auto channel : TrackList::Channels(pTrack)) {
             channel->SetLastScaleType();
             WaveTrackView::Get( *channel )
-               .SetDisplay(WaveTrackView::WaveTrackDisplay(id));
+               .SetDisplay( WaveTrackView::Display{ id } );
          }
 
          AudacityProject *const project = &mpData->project;
@@ -886,7 +917,7 @@ void WaveTrackMenuTable::OnSpectrogramSettings(wxCommandEvent &)
    // factories.push_back(WaveformPrefsFactory( pTrack ));
    factories.push_back(SpectrumPrefsFactory( pTrack ));
    const int page =
-      // (pTrack->GetDisplay() == WaveTrack::Spectrum) ? 1 :
+      // (pTrack->GetDisplay() == WaveTrackViewConstants::Spectrum) ? 1 :
       0;
 
    auto title = XO("%s:").Format( pTrack->GetName() );

src/tracks/playabletrack/wavetrack/ui/WaveTrackView.cpp

@@ -40,6 +40,53 @@ Paul Licameli split from TrackPanel.cpp
 #include "../../../ui/ButtonHandle.h"
 #include "../../../../TrackInfo.h"
 
+namespace {
+   class Registry {
+   public:
+      using Type = WaveTrackSubView::Type;
+      using Types = std::vector< Type >;
+
+      void Append( Type type )
+      {
+         types.emplace_back( std::move( type ) );
+         sorted = false;
+      }
+
+      Types &Get()
+      {
+         if ( !sorted ) {
+            auto begin = types.begin(), end = types.end();
+            std::sort( begin, end );
+            // We don't want duplicate ids!
+            wxASSERT( end == std::adjacent_find( begin, end ) );
+            sorted = true;
+         }
+         return types;
+      }
+
+   private:
+      Types types;
+      bool sorted = false;
+   };
+
+   Registry &GetRegistry()
+   {
+      static Registry result;
+      return result;
+   }
+}
+
+WaveTrackSubView::RegisteredType::RegisteredType( Type type )
+{
+   GetRegistry().Append( std::move( type ) );
+}
+
+// static
+auto WaveTrackSubView::AllTypes() -> const Types &
+{
+   return GetRegistry().Get();
+}
+
 namespace {
 
 using WaveTrackSubViewPtrs = std::vector< std::shared_ptr< WaveTrackSubView > >;
@@ -842,12 +889,13 @@ WaveTrackView::DoDetailedHitTest
    return { false, results };
 }
 
-auto WaveTrackView::GetDisplays() const -> std::vector<WaveTrackDisplay>
+auto WaveTrackView::GetDisplays() const
+   -> std::vector< WaveTrackSubView::Type >
 {
    BuildSubViews();
 
    // Collect the display types of visible views and sort them by position
-   using Pair = std::pair< int, WaveTrackDisplay >;
+   using Pair = std::pair< int, WaveTrackSubView::Type >;
    std::vector< Pair > pairs;
    size_t ii = 0;
    WaveTrackSubViews::ForEach( [&]( const WaveTrackSubView &subView ){
@@ -857,24 +905,24 @@ auto WaveTrackView::GetDisplays() const -> std::vector<WaveTrackDisplay>
       ++ii;
    } );
    std::sort( pairs.begin(), pairs.end() );
-   std::vector<WaveTrackDisplay> results;
+   std::vector< WaveTrackSubView::Type > results;
    for ( const auto &pair : pairs )
       results.push_back( pair.second );
    return results;
 }
 
-void WaveTrackView::SetDisplay(WaveTrackDisplay display, bool exclusive)
+void WaveTrackView::SetDisplay(Display display, bool exclusive)
 {
    BuildSubViews();
    DoSetDisplay( display, exclusive );
 }
 
-bool WaveTrackView::ToggleSubView(WaveTrackDisplay display)
+bool WaveTrackView::ToggleSubView(Display display)
 {
    size_t ii = 0;
    size_t found = 0;
    if ( WaveTrackSubViews::FindIf( [&]( const WaveTrackSubView &subView ) {
-      if ( subView.SubViewType() == display ) {
+      if ( subView.SubViewType().id == display ) {
          found = ii;
          return true;
       }
@@ -927,7 +975,7 @@ bool WaveTrackView::ToggleSubView(WaveTrackDisplay display)
 // If exclusive, make the chosen view take up all the height.  Else,
 // partition equally, putting the specified view on top.
 // Be sure the sequence in which the other views appear is determinate.
-void WaveTrackView::DoSetDisplay(WaveTrackDisplay display, bool exclusive)
+void WaveTrackView::DoSetDisplay(Display display, bool exclusive)
 {
    // Some generality here anticipating more than two views.
    // The order of sub-views in the array is not specified, so make it definite
@@ -935,7 +983,7 @@ void WaveTrackView::DoSetDisplay(WaveTrackDisplay display, bool exclusive)
    size_t ii = 0;
    std::vector< std::pair< WaveTrackViewConstants::Display, size_t > > pairs;
    WaveTrackSubViews::ForEach( [&pairs, &ii]( WaveTrackSubView &subView ){
-      pairs.push_back( { subView.SubViewType(), ii++ } );
+      pairs.push_back( { subView.SubViewType().id, ii++ } );
    } );
    std::sort( pairs.begin(), pairs.end() );
 

src/tracks/playabletrack/wavetrack/ui/WaveTrackView.h

@@ -13,19 +13,44 @@ Paul Licameli split from class WaveTrack
 
 #include "../../../ui/CommonTrackView.h"
 #include "../../../../ClientData.h"
+#include "audacity/ComponentInterface.h"
 namespace WaveTrackViewConstants{ enum Display : int; }
 
 class CutlineHandle;
+class TranslatableString;
 class WaveTrack;
 class WaveTrackView;
 
 class WaveTrackSubView : public CommonTrackView
 {
 public:
+
+   using Display = WaveTrackViewConstants::Display;
+   struct Type {
+      // Identifies the type session-wide, and determines relative position in
+      // menus listing all types
+      Display id;
+      // The translation is suitable for the track control panel drop-down,
+      // and it may contain a menu accelerator
+      EnumValueSymbol name;
+
+      bool operator < ( const Type &other ) const { return id < other.id; }
+      bool operator == ( const Type &other ) const { return id == other.id; }
+   };
+   using Types = std::vector< Type >;
+
+   // Typically a file scope statically constructed object
+   struct RegisteredType {
+      RegisteredType( Type type );
+   };
+
+   // Discover all registered types
+   static const Types &AllTypes();
+
    explicit
    WaveTrackSubView( WaveTrackView &waveTrackView );
    
-   virtual WaveTrackViewConstants::Display SubViewType() const = 0;
+   virtual const Type &SubViewType() const = 0;
 
    std::pair<
       bool, // if true, hit-testing is finished
@@ -67,6 +92,8 @@ class WaveTrackView final
    WaveTrackView &operator=( const WaveTrackView& ) = delete;
 
 public:
+   using Display = WaveTrackViewConstants::Display;
+
    static WaveTrackView &Get( WaveTrack &track );
    static const WaveTrackView &Get( const WaveTrack &track );
 
@@ -91,10 +118,8 @@ public:
       const std::shared_ptr<WaveTrack> &wt,
       CommonTrackView &view);
 
-   using WaveTrackDisplay = WaveTrackViewConstants::Display;
+   std::vector< WaveTrackSubView::Type > GetDisplays() const;
-
+   void SetDisplay(Display display, bool exclusive = true);
-   std::vector<WaveTrackDisplay> GetDisplays() const;
-   void SetDisplay(WaveTrackDisplay display, bool exclusive = true);
 
    const WaveTrackSubViewPlacements &SavePlacements() const
       { return mPlacements; }
@@ -103,7 +128,7 @@ public:
 
    // Return true if successful.  Fails if you try to toggle off the only
    // sub-view.
-   bool ToggleSubView( WaveTrackDisplay id );
+   bool ToggleSubView( Display id );
 
    // Get all the sub-views, in a sequence that is unspecified but in
    // correspondence with the result of SavePlacements
@@ -117,7 +142,7 @@ public:
 
 private:
    void BuildSubViews() const;
-   void DoSetDisplay(WaveTrackDisplay display, bool exclusive = true);
+   void DoSetDisplay(Display display, bool exclusive = true);
 
    // TrackPanelDrawable implementation
    void Draw(

src/tracks/playabletrack/wavetrack/ui/WaveformView.cpp

@@ -36,6 +36,13 @@ Paul Licameli split from WaveTrackView.cpp
 #include <wx/graphics.h>
 #include <wx/dc.h>
 
+static WaveTrackSubView::Type sType{
+   WaveTrackViewConstants::Waveform,
+   { wxT("Waveform"), XO("Wa&veform") }
+};
+
+static WaveTrackSubView::RegisteredType reg{ sType };
+
 WaveformView::~WaveformView() = default;
 
 std::vector<UIHandlePtr> WaveformView::DetailedHitTest(
@@ -119,9 +126,9 @@ void WaveformView::DoSetMinimized( bool minimized )
    TrackView::DoSetMinimized( minimized );
 }
 
-WaveTrackViewConstants::Display WaveformView::SubViewType() const
+auto WaveformView::SubViewType() const -> const Type &
 {
-   return WaveTrackViewConstants::Waveform;
+   return sType;
 }
 
 std::shared_ptr<TrackVRulerControls> WaveformView::DoGetVRulerControls()

src/tracks/playabletrack/wavetrack/ui/WaveformView.h

@@ -26,7 +26,7 @@ public:
    using WaveTrackSubView::WaveTrackSubView;
    ~WaveformView() override;
 
-   virtual WaveTrackViewConstants::Display SubViewType() const override;
+   const Type &SubViewType() const override;
 
    std::shared_ptr<TrackVRulerControls> DoGetVRulerControls() override;