Generalize WaveTrackView::GetDisplay to return multiple values...

... something better might be done in Nyquist Lisp, where we still pass a
single value

src/effects/nyquist/Nyquist.cpp

@@ -544,8 +544,11 @@ bool NyquistEffect::Init()
 
       for ( auto t :
                TrackList::Get( *project ).Selected< const WaveTrack >() ) {
-         if (WaveTrackView::Get(*t).GetDisplay()
-               != WaveTrackViewConstants::Spectrum ||
+         const auto displays = WaveTrackView::Get(*t).GetDisplays();
+         bool hasSpectral =
+            make_iterator_range( displays.begin(), displays.end())
+               .contains( WaveTrackViewConstants::Spectrum );
+         if ( !hasSpectral ||
              !(t->GetSpectrogramSettings().SpectralSelectionEnabled())) {
             bAllowSpectralEditing = false;
             break;
@@ -1069,7 +1072,12 @@ bool NyquistEffect::ProcessOne()
          [&](const WaveTrack *wt) {
             type = wxT("wave");
             spectralEditp = mCurTrack[0]->GetSpectrogramSettings().SpectralSelectionEnabled()? wxT("T") : wxT("NIL");
-            switch ( WaveTrackView::Get( *wt ).GetDisplay() )
+            // To do: accommodate split views
+            auto viewType = WaveTrackViewConstants::NoDisplay;
+            auto displays = WaveTrackView::Get( *wt ).GetDisplays();
+            if (!displays.empty())
+               viewType = displays[0];
+            switch ( viewType )
             {
             case Waveform:
                view = (mCurTrack[0]->GetWaveformSettings().scaleType == 0) ? wxT("\"Waveform\"") : wxT("\"Waveform (dB)\"");

src/menus/SelectMenus.cpp

@@ -35,8 +35,9 @@ void DoNextPeakFrequency(AudacityProject &project, bool up)
    // Find the first selected wave track that is in a spectrogram view.
    const WaveTrack *pTrack {};
    for ( auto wt : tracks.Selected< const WaveTrack >() ) {
-      const auto display = WaveTrackView::Get( *wt ).GetDisplay();
-      if (display == WaveTrackViewConstants::Spectrum) {
+      const auto displays = WaveTrackView::Get( *wt ).GetDisplays();
+      if ( make_iterator_range( displays.begin(), displays.end() )
+         .contains( WaveTrackViewConstants::Spectrum) ) {
          pTrack = wt;
          break;
       }

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

@@ -599,19 +599,23 @@ void WaveTrackMenuTable::InitMenu(Menu *pMenu, void *pUserData)
 
    std::vector<int> checkedIds;
 
-   const auto display = WaveTrackView::Get( *pTrack ).GetDisplay();
-   checkedIds.push_back(
-      display == WaveTrackViewConstants::Waveform
-         ? (pTrack->GetWaveformSettings().isLinear()
-            ? OnWaveformID : OnWaveformDBID)
-         : OnSpectrumID);
+   const auto displays = WaveTrackView::Get( *pTrack ).GetDisplays();
+   for ( auto display : displays ) {
+      checkedIds.push_back(
+         display == WaveTrackViewConstants::Waveform
+            ? (pTrack->GetWaveformSettings().isLinear()
+               ? OnWaveformID : OnWaveformDBID)
+            : OnSpectrumID);
+   }
 
    // Bug 1253.  Shouldn't open preferences if audio is busy.
    // We can't change them on the fly yet anyway.
    auto gAudioIO = AudioIOBase::Get();
    const bool bAudioBusy = gAudioIO->IsBusy();
-   pMenu->Enable(OnSpectrogramSettingsID,
-      (display == WaveTrackViewConstants::Spectrum) && !bAudioBusy);
+   bool hasSpectrum =
+      make_iterator_range( displays.begin(), displays.end() )
+         .contains( WaveTrackViewConstants::Spectrum );
+   pMenu->Enable(OnSpectrogramSettingsID, hasSpectrum && !bAudioBusy);
 
    AudacityProject *const project = ::GetActiveProject();
    auto &tracks = TrackList::Get( *project );
@@ -683,9 +687,9 @@ void WaveTrackMenuTable::InitMenu(Menu *pMenu, void *pUserData)
 BEGIN_POPUP_MENU(WaveTrackMenuTable)
    POPUP_MENU_SEPARATOR()
 
-   POPUP_MENU_RADIO_ITEM(OnWaveformID, _("Wa&veform"), OnSetDisplay)
-   POPUP_MENU_RADIO_ITEM(OnWaveformDBID, _("&Waveform (dB)"), OnSetDisplay)
-   POPUP_MENU_RADIO_ITEM(OnSpectrumID, _("&Spectrogram"), OnSetDisplay)
+   POPUP_MENU_CHECK_ITEM(OnWaveformID, _("Wa&veform"), OnSetDisplay)
+   POPUP_MENU_CHECK_ITEM(OnWaveformDBID, _("&Waveform (dB)"), OnSetDisplay)
+   POPUP_MENU_CHECK_ITEM(OnSpectrumID, _("&Spectrogram"), OnSetDisplay)
    POPUP_MENU_ITEM(OnSpectrogramSettingsID, _("S&pectrogram Settings..."), OnSpectrogramSettings)
    POPUP_MENU_SEPARATOR()
 
@@ -702,11 +706,15 @@ BEGIN_POPUP_MENU(WaveTrackMenuTable)
 #endif
 
    WaveTrack *const pTrack = static_cast<WaveTrack*>(mpTrack);
-   if( pTrack &&
-      WaveTrackView::Get( *pTrack ).GetDisplay()
-         != WaveTrackViewConstants::Spectrum ){
-      POPUP_MENU_SEPARATOR()
-      POPUP_MENU_SUB_MENU(OnWaveColorID, _("&Wave Color"), WaveColorMenuTable)
+   if ( pTrack ) {
+      const auto displays = WaveTrackView::Get( *pTrack ).GetDisplays();
+      bool hasWaveform =
+         make_iterator_range( displays.begin(), displays.end() )
+            .contains( WaveTrackViewConstants::Waveform );
+      if( hasWaveform ){
+         POPUP_MENU_SEPARATOR()
+         POPUP_MENU_SUB_MENU(OnWaveColorID, _("&Wave Color"), WaveColorMenuTable)
+      }
    }
 
    POPUP_MENU_SEPARATOR()
@@ -736,7 +744,8 @@ void WaveTrackMenuTable::OnSetDisplay(wxCommandEvent & event)
       id = Spectrum; break;
    }
 
-   const bool wrongType = WaveTrackView::Get( *pTrack ).GetDisplay() != id;
+   const auto displays = WaveTrackView::Get( *pTrack ).GetDisplays();
+   const bool wrongType = !(displays.size() == 1 && displays[0] == id);
    const bool wrongScale =
       (id == Waveform &&
       pTrack->GetWaveformSettings().isLinear() != linear);

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

@@ -113,18 +113,23 @@ WaveTrackView::DoDetailedHitTest
    return { false, results };
 }
 
-auto WaveTrackView::GetDisplay() const -> WaveTrackDisplay
+auto WaveTrackView::GetDisplays() const -> std::vector<WaveTrackDisplay>
 {
-   // To do:  make the return a vector of values.  For now, just report the
-   // last sub-view that is visible.
-   WaveTrackDisplay display{ WaveTrackViewConstants::NoDisplay };
+   // Collect the display types of visible views and sort them by position
+   using Pair = std::pair< int, WaveTrackDisplay >;
+   std::vector< Pair > pairs;
    size_t ii = 0;
    WaveTrackSubViews::ForEach( [&]( const WaveTrackSubView &subView ){
-      if ( mPlacements[ii].fraction > 0 )
-         display = subView.SubViewType();
+      auto &placement = mPlacements[ii];
+      if ( placement.fraction > 0 )
+         pairs.emplace_back( placement.index, subView.SubViewType() );
       ++ii;
    } );
-   return display;
+   std::sort( pairs.begin(), pairs.end() );
+   std::vector<WaveTrackDisplay> results;
+   for ( const auto &pair : pairs )
+      results.push_back( pair.second );
+   return results;
 }
 
 void WaveTrackView::SetDisplay(WaveTrackDisplay display)

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

@@ -69,7 +69,7 @@ public:
 
    using WaveTrackDisplay = WaveTrackViewConstants::Display;
 
-   WaveTrackDisplay GetDisplay() const;
+   std::vector<WaveTrackDisplay> GetDisplays() const;
    void SetDisplay(WaveTrackDisplay display);
 
    const WaveTrackSubViewPlacements &SavePlacements() const