Expose option in score menu to switch displaying notes diff

- prepare_build

src/main/tmainscoreobject.cpp

@@ -95,6 +95,15 @@ TmainScoreObject::TmainScoreObject(QObject* parent) :
 
   m_notesMenuAct = new Taction(tr("notes", "musical notes of course") + QStringLiteral("   ⋮"), QStringLiteral("score"), this);
 
+  m_reviewModeAct = new Taction(tr("Review mode"), QString(), this);
+  m_reviewModeAct->setCheckable(true);
+  m_reviewModeAct->setChecked(GLOB->showNotesDiff());
+  m_reviewModeAct->setTip(tr("Do not change score when playing on instrument and display bar to see selected and played notes."));
+  connect(m_reviewModeAct, &Taction::triggered, this, [=]{
+    m_reviewModeAct->setChecked(!m_reviewModeAct->checked());
+    GLOB->setShowNotesDiff(m_reviewModeAct->checked());
+  });
+
   QQmlComponent actionsComp(NOO->qmlEngine(), this);
   m_openXmlAct->createQmlShortcut(&actionsComp, "StandardKey.Open; enabled: !GLOB.singleNoteMode && !GLOB.isExam");
   m_saveXmlAct->createQmlShortcut(&actionsComp, "StandardKey.Save; enabled: !GLOB.singleNoteMode && !GLOB.isExam");
@@ -166,6 +175,7 @@ void TmainScoreObject::setScoreObject(TscoreObject* scoreObj) {
   });
   m_scoreObj->clearScoreAct()->setBgColor(QColor(255, 140, 0)); // orange
 #if !defined (Q_OS_ANDROID)
+  m_scoreActions.prepend(m_reviewModeAct);
   m_scoreActions.prepend(m_scoreObj->editModeAct());
   m_scoreActions << m_scoreObj->insertNoteAct() << m_scoreObj->deleteNoteAct()
                  << m_scoreObj->clearScoreAct() << m_transposeAct << m_notesMenuAct;
@@ -594,6 +604,7 @@ void TmainScoreObject::isExamChangedSlot() {
   }
   if (m_scoreObj) {
 #if !defined (Q_OS_ANDROID)
+    m_scoreActions.prepend(m_reviewModeAct);
     m_scoreActions.prepend(m_scoreObj->editModeAct());
     m_scoreActions << m_scoreObj->insertNoteAct() << m_scoreObj->deleteNoteAct()
                    << m_scoreObj->clearScoreAct() << m_transposeAct << m_notesMenuAct;

src/main/tmainscoreobject.h

@@ -64,6 +64,7 @@ class TmainScoreObject : public QObject
   Q_PROPERTY(Taction* randMelodyAct READ randMelodyAct)
   Q_PROPERTY(Taction* notesMenuAct READ notesMenuAct)
   Q_PROPERTY(Taction* transposeAct READ transposeAct)
+  Q_PROPERTY(Taction* reviewModeAct READ reviewModeAct)
   Q_PROPERTY(QList<QObject*> melodyActions READ melodyActions NOTIFY melodyActionsChanged)
   Q_PROPERTY(QString keyNameText READ keyNameText NOTIFY keyNameTextChanged)
   Q_PROPERTY(QQuickItem* mainScoreItem READ mainScoreItem WRITE setMainScoreItem)
@@ -96,6 +97,7 @@ public:
   Taction* saveXmlAct() { return m_saveXmlAct; }
   Taction* randMelodyAct() { return m_randMelodyAct; }
   Taction* notesMenuAct() { return m_notesMenuAct; }
+  Taction* reviewModeAct() { return m_reviewModeAct; }
 
   QList<QObject*> melodyActions() { return m_melodyActions; }
 
@@ -210,6 +212,7 @@ private:
   Taction                   *m_openXmlAct, *m_saveXmlAct, *m_randMelodyAct;
   Taction                   *m_nextNoteAct, *m_prevNoteAct;
   Taction                   *m_notesMenuAct = nullptr;
+  Taction                   *m_reviewModeAct = nullptr;
   QList<QObject*>            m_scoreActions;
   QList<QObject*>            m_noteActions;
   QList<QObject*>            m_melodyActions;