Rewrite GetInfoCommand::ExploreTrackPanel...

... implemented simply and more correctly (though not efficiently), hiding
details about the method of rectangle subdivision, and allowing for multiple
sub-views.

This function can be exercised by choosing Boxes in the Track Info item of
Extra > Scriptables II

This commit leaves one fewer call to each of TrackView::GetY() and
TrackView::GetHeight()

(cherry picked from audacity commit 1880c14f112e3f38214f8517e6b9f8c6359a0171)

Signed-off-by: akleja <storspov@gmail.com>

src/TrackPanel.cpp

@@ -1580,6 +1580,18 @@ wxRect TrackPanel::FindFocusedTrackRect( const Track * target )
    return rect;
 }
 
+std::vector<wxRect> TrackPanel::FindRulerRects( const Track *target )
+{
+   std::vector<wxRect> results;
+   if (target)
+      VisitCells( [&]( const wxRect &rect, TrackPanelCell &visited ) {
+         if (auto pRuler = dynamic_cast<const TrackVRulerControls*>(&visited);
+             pRuler && pRuler->FindTrack().get() == target)
+            results.push_back(rect);
+      } );
+   return results;
+}
+
 TrackPanelCell *TrackPanel::GetFocusedCell()
 {
    auto pTrack = TrackFocus::Get( *GetProject() ).Get();
@@ -1603,27 +1615,3 @@ void TrackPanel::OnTrackFocusChange( wxCommandEvent &event )
       Refresh( false );
    }
 }
-
-IsVisibleTrack::IsVisibleTrack(AudacityProject *project)
-   : mPanelRect {
-        wxPoint{ 0, ViewInfo::Get( *project ).vpos },
-        wxSize{
-           ViewInfo::Get( *project ).GetTracksUsableWidth(),
-           ViewInfo::Get( *project ).GetHeight()
-        }
-     }
-{}
-
-bool IsVisibleTrack::operator () (const Track *pTrack) const
-{
-   // Need to return true if this track or a later channel intersects
-   // the view
-   return
-   TrackList::Channels(pTrack).StartingWith(pTrack).any_of(
-      [this]( const Track *pT ) {
-         auto &view = TrackView::Get( *pT );
-         wxRect r(0, view.GetY(), 1, view.GetHeight());
-         return r.Intersects(mPanelRect);
-      }
-   );
-}

src/TrackPanel.h

@@ -149,6 +149,13 @@ public:
    */
    wxRect FindFocusedTrackRect( const Track * target );
 
+   /*!
+    @return extents of the vertical rulers of one channel, top to bottom.
+    (There may be multiple sub-views, each with a ruler.)
+    If target is nullptr, returns an empty vector.
+    */
+   std::vector<wxRect> FindRulerRects( const Track * target );
+
 protected:
    // Get the root object defining a recursive subdivision of the panel's
    // area into cells

src/commands/GetInfoCommand.cpp

@@ -694,80 +694,20 @@ void GetInfoCommand::ExploreAdornments( const CommandContext &context,
 }
 
 void GetInfoCommand::ExploreTrackPanel( const CommandContext &context,
-   wxPoint P, wxWindow * pWin, int WXUNUSED(Id), int depth )
+   wxPoint P, int depth )
 {
    AudacityProject * pProj = &context.project;
    auto &tp = TrackPanel::Get( *pProj );
-   auto &viewInfo = ViewInfo::Get( *pProj );
-
-   wxRect trackRect = pWin->GetRect();
-
-   for ( auto t : TrackList::Get( *pProj ).Any() + IsVisibleTrack{ pProj } ) {
-      auto &view = TrackView::Get( *t );
-      trackRect.y = view.GetY() - viewInfo.vpos;
-      trackRect.height = view.GetHeight();
-
-#if 0
-      // Work in progress on getting the TCP button positions and sizes.
-      wxRect rect = trackRect;
-      Track *l = t->GetLink();
-
-      if (t->GetLinked()) {
-         rect.height += l->GetHeight();
-      }
-
-      switch (t->GetKind()) {
-         case Track::Wave:
-         {
-            break;
-         }
-#ifdef USE_MIDI
-         case Track::Note:
-         {
-            break;
-         }
-#endif // USE_MIDI
-         case Track::Label:
-            break;
-         case Track::Time:
-            break;
-      }
-      {
-         // Start with whole track rect
-         wxRect R = trackRect;
-
-         // Now exclude left, right, and top insets
-         R.x += kLeftInset;
-         R.y += kTopInset;
-         R.width -= kLeftInset * 2;
-         R.height -= kTopInset;
-
-         int labelw = viewInfo.GetLabelWidth();
-         //int vrul = viewInfo.GetVRulerOffset();
-         bool bIsWave = true;
-         //mTrackInfo.DrawBackground(dc, R, t->GetSelected(), bIsWave, labelw, vrul);
-
-
-         for (Overlay * pOverlay : pTP->mOverlays) {
-            auto R2(pOverlay->GetRectangle(trackRect.GetSize()).first);
-            context.Status( wxString::Format("  [ %2i, %3i, %3i, %3i, %3i, \"%s\" ],", 
-               depth, R2.GetLeft(), R2.GetTop(), R2.GetRight(), R2.GetBottom(), "Otherthing" )); 
-         }
-      }
-#endif
-
-      // The VRuler.
-      {  
-         wxRect R = trackRect;
-         R.x += viewInfo.GetVRulerOffset();
-         R.y += kTopMargin;
-         R.width = viewInfo.GetVRulerWidth();
-         R.height -= (kTopMargin + kBottomMargin);
+   wxRect panelRect{ {}, tp.GetSize() };
+   for ( auto t : TrackList::Get( *pProj ).Any() ) {
+      auto rulers = tp.FindRulerRects(t);
+      for (auto &R : rulers) {
+         if (!R.Intersects(panelRect))
+            continue;
          R.SetPosition( R.GetPosition() + P );
-
          context.StartStruct();
          context.AddItem( depth, "depth" );
-         context.AddItem( "VRuler", "label" ); 
+         context.AddItem( "VRuler", "label" );
          context.StartField("box");
          context.StartArray();
          context.AddItem( R.GetLeft() );
@@ -790,7 +730,7 @@ void GetInfoCommand::ExploreWindows( const CommandContext &context,
    if( pWin->GetName() == "Track Panel" )
    {
       wxRect R = pWin->GetScreenRect();
-      ExploreTrackPanel(  context, R.GetPosition()-P, pWin, Id, depth );
+      ExploreTrackPanel(  context, R.GetPosition()-P, depth );
       return;
    }
    wxWindowList list = pWin->GetChildren();

src/commands/GetInfoCommand.h

@@ -58,7 +58,7 @@ private:
 
    void ExploreMenu( const CommandContext &context, wxMenu * pMenu, int Id, int depth );
    void ExploreTrackPanel( const CommandContext & context,
-      wxPoint P, wxWindow * pWin, int Id, int depth );
+      wxPoint P, int depth );
    void ExploreAdornments( const CommandContext & context,
       wxPoint P, wxWindow * pWin, int Id, int depth );
    void ExploreWindows( const CommandContext & context,