Common functions read and write mute and solo in Wave and Note

src/NoteTrack.cpp

@@ -758,6 +758,8 @@ bool NoteTrack::HandleXMLTag(const wxChar *tag, const wxChar **attrs)
          double dblValue;
          if (!wxStrcmp(attr, wxT("name")) && XMLValueChecker::IsGoodString(strValue))
             mName = strValue;
+         else if (this->NoteTrackBase::HandleXMLAttribute(attr, value))
+         {}
          else if (!wxStrcmp(attr, wxT("offset")) &&
                   XMLValueChecker::IsGoodString(strValue) &&
                   Internat::CompatibleToDouble(strValue, &dblValue))
@@ -831,10 +833,7 @@ void NoteTrack::WriteXML(XMLWriter &xmlFile) const
    saveme->mSeq->write(data, true);
    xmlFile.StartTag(wxT("notetrack"));
    xmlFile.WriteAttr(wxT("name"), saveme->mName);
-#ifdef EXPERIMENTAL_MIDI_OUT
+   this->NoteTrackBase::WriteXMLAttributes(xmlFile);
-   xmlFile.WriteAttr(wxT("mute"), mMute);
-   xmlFile.WriteAttr(wxT("solo"), mSolo);
-#endif
    xmlFile.WriteAttr(wxT("offset"), saveme->GetOffset());
    xmlFile.WriteAttr(wxT("visiblechannels"), saveme->mVisibleChannels);
    xmlFile.WriteAttr(wxT("height"), saveme->GetActualHeight());

src/Track.cpp

@@ -341,6 +341,33 @@ void PlayableTrack::Merge( const Track &orig )
    AudioTrack::Merge( *pOrig );
 }
 
+// Serialize, not with tags of its own, but as attributes within a tag.
+void PlayableTrack::WriteXMLAttributes(XMLWriter &xmlFile) const
+{
+   xmlFile.WriteAttr(wxT("mute"), mMute);
+   xmlFile.WriteAttr(wxT("solo"), mSolo);
+   AudioTrack::WriteXMLAttributes(xmlFile);
+}
+
+// Return true iff the attribute is recognized.
+bool PlayableTrack::HandleXMLAttribute(const wxChar *attr, const wxChar *value)
+{
+   const wxString strValue{ value };
+   long nValue;
+   if (!wxStrcmp(attr, wxT("mute")) &&
+            XMLValueChecker::IsGoodInt(strValue) && strValue.ToLong(&nValue)) {
+      mMute = (nValue != 0);
+      return true;
+   }
+   else if (!wxStrcmp(attr, wxT("solo")) &&
+            XMLValueChecker::IsGoodInt(strValue) && strValue.ToLong(&nValue)) {
+      mSolo = (nValue != 0);
+      return true;
+   }
+
+   return AudioTrack::HandleXMLAttribute(attr, value);
+}
+
 // TrackListIterator
 TrackListIterator::TrackListIterator(TrackList * val)
    : l(val)

src/Track.h

@@ -251,6 +251,13 @@ public:
    AudioTrack(const std::shared_ptr<DirManager> &projDirManager)
       : Track{ projDirManager } {}
    AudioTrack(const Track &orig) : Track{ orig } {}
+
+   // Serialize, not with tags of its own, but as attributes within a tag.
+   void WriteXMLAttributes(XMLWriter &xmlFile) const {}
+
+   // Return true iff the attribute is recognized.
+   bool HandleXMLAttribute(const wxChar * /*attr*/, const wxChar * /*value*/)
+   { return false; }
 };
 
 class PlayableTrack /* not final */ : public AudioTrack
@@ -268,6 +275,12 @@ public:
    void Init( const PlayableTrack &init );
    void Merge( const Track &init ) override;
 
+   // Serialize, not with tags of its own, but as attributes within a tag.
+   void WriteXMLAttributes(XMLWriter &xmlFile) const;
+
+   // Return true iff the attribute is recognized.
+   bool HandleXMLAttribute(const wxChar *attr, const wxChar *value);
+
 protected:
    bool                mMute { false };
    bool                mSolo { false };

src/WaveTrack.cpp

@@ -1685,12 +1685,8 @@ bool WaveTrack::HandleXMLTag(const wxChar *tag, const wxChar **attrs)
             // track is created.
             mLegacyProjectFileOffset = dblValue;
          }
-         else if (!wxStrcmp(attr, wxT("mute")) &&
+         else if (this->PlayableTrack::HandleXMLAttribute(attr, value))
-                  XMLValueChecker::IsGoodInt(strValue) && strValue.ToLong(&nValue))
+         {}
-            mMute = (nValue != 0);
-         else if (!wxStrcmp(attr, wxT("solo")) &&
-                  XMLValueChecker::IsGoodInt(strValue) && strValue.ToLong(&nValue))
-            mSolo = (nValue != 0);
          else if (!wxStrcmp(attr, wxT("height")) &&
                   XMLValueChecker::IsGoodInt(strValue) && strValue.ToLong(&nValue))
             mHeight = nValue;
@@ -1789,8 +1785,7 @@ void WaveTrack::WriteXML(XMLWriter &xmlFile) const
    xmlFile.WriteAttr(wxT("name"), mName);
    xmlFile.WriteAttr(wxT("channel"), mChannel);
    xmlFile.WriteAttr(wxT("linked"), mLinked);
-   xmlFile.WriteAttr(wxT("mute"), mMute);
+   this->PlayableTrack::WriteXMLAttributes(xmlFile);
-   xmlFile.WriteAttr(wxT("solo"), mSolo);
 #ifdef EXPERIMENTAL_OUTPUT_DISPLAY
    int height;
    if(MONO_PAN)