add proper access to stem, beam, slahbeam and hook of chords

libmscore/beam.h

@@ -74,7 +74,7 @@ class Beam : public Element {
             AUTO, BEGIN, MID, END, NONE, BEGIN32, BEGIN64, INVALID = -1
             };
 
-      Beam(Score* s);
+      Beam(Score* = 0);
       Beam(const Beam&);
       ~Beam();
       virtual Beam* clone() const override         { return new Beam(*this); }

libmscore/chord.h

@@ -55,6 +55,8 @@ enum class PlayEventType : char    {
 //   @P graceNotes  array[Ms::Chord]   the list of grace note chords (read only)
 //   @P stem        Ms::Stem           the stem of the chord if any (read only)
 //   @P hook        Ms::Hook           the hook of the chord if any (read only)
+//   @P beam        Ms::Beam           the beam of the chord if any (read only)
+//   @P stemSlash   Ms::StemSlash      the stem slash of the chord (acciacatura) if any (read only)
 //---------------------------------------------------------
 
 class Chord : public ChordRest {
@@ -72,6 +74,8 @@ class Chord : public ChordRest {
       Q_PROPERTY(QQmlListProperty<Ms::Chord> graceNotes READ qmlGraceNotes)
       Q_PROPERTY(Ms::Hook* hook              READ hook)
       Q_PROPERTY(Ms::Stem* stem              READ stem)
+      Q_PROPERTY(Ms::Beam* beam              READ beam)
+      Q_PROPERTY(Ms::StemSlash* stemSlash    READ stemSlash)
 
       QList<Note*>         _notes;       // sorted to decreasing line step
       LedgerLine*          _ledgerLines; // single linked list

libmscore/hook.h

@@ -29,7 +29,7 @@ class Hook : public Symbol {
       int _hookType;
 
    public:
-      Hook(Score*);
+      Hook(Score* = 0);
       virtual Hook* clone() const override        { return new Hook(*this); }
       virtual qreal mag() const override          { return parent()->mag(); }
       virtual Element::Type type() const override { return Element::Type::HOOK; }

libmscore/mscore.cpp

@@ -50,6 +50,8 @@
 #include "mscoreview.h"
 #include "plugins.h"
 #include "chord.h"
+#include "hook.h"
+#include "stem.h"
 
 namespace Ms {
 
@@ -327,6 +329,10 @@ QQmlEngine* MScore::qml()
             qmlRegisterType<Lyrics>     ("MuseScore", 1, 0, "Lyrics");
             qmlRegisterType<FiguredBassItem>("MuseScore", 1, 0, "FiguredBassItem");
             qmlRegisterType<LayoutBreak>("MuseScore", 1, 0, "LayoutBreak");
+            qmlRegisterType<Hook>       ("MuseScore", 1, 0, "Hook");
+            qmlRegisterType<Stem>       ("MuseScore", 1, 0, "Stem");
+            qmlRegisterType<Stem>       ("MuseScore", 1, 0, "StemSlash");
+            qmlRegisterType<Beam>       ("MuseScore", 1, 0, "Beam");
 
             qmlRegisterUncreatableType<Element>("MuseScore", 1, 0,
                "Element", tr("you cannot create an element"));

libmscore/notedot.h

@@ -29,7 +29,7 @@ class NoteDot : public Element {
       int _idx;
 
    public:
-      NoteDot(Score* =0);
+      NoteDot(Score* = 0);
       virtual NoteDot* clone() const override     { return new NoteDot(*this); }
       virtual Element::Type type() const override { return Element::Type::NOTEDOT; }
       int idx() const                    { return _idx; }

libmscore/stem.h

@@ -36,7 +36,7 @@ class Stem : public Element {
       virtual void startEdit(MuseScoreView*, const QPointF&);
 
    public:
-      Stem(Score*);
+      Stem(Score* = 0);
       Stem &operator=(const Stem&) = delete;
 
       virtual Stem* clone() const        { return new Stem(*this); }

libmscore/stemslash.h

@@ -29,7 +29,7 @@ class StemSlash : public Element {
       QLineF line;
 
    public:
-      StemSlash(Score* s) : Element(s)   {}
+      StemSlash(Score* s = 0) : Element(s)   {}
 
       virtual qreal mag() const          { return parent()->mag(); }
       void setLine(const QLineF& l);