contact: Add CategorizedContactModel singleton

Refs #70196

src/categorizedcontactmodel.cpp

@@ -71,7 +71,6 @@ public:
    void slotContactMethodCountChanged      (int,int);
    void slotContactMethodCountAboutToChange(int,int);
 };
-
 class CategorizedContactModelPrivate : public QObject
 {
    Q_OBJECT
@@ -94,6 +93,9 @@ public:
    ContactTreeNode* getContactTopLevelItem(const QString& category);
    QModelIndex getIndex(int row, int column, ContactTreeNode* parent);
 
+   //Singleton
+   static CategorizedContactModel* m_spInstance;
+
 private:
    CategorizedContactModel* q_ptr;
 
@@ -102,6 +104,8 @@ public Q_SLOTS:
    void slotContactAdded(const Person* c);
 };
 
+CategorizedContactModel* CategorizedContactModelPrivate::m_spInstance = nullptr;
+
 ContactTreeNode::ContactTreeNode(const Person* ct, CategorizedContactModel* parent) : CategorizedCompositeNode(CategorizedCompositeNode::Type::CONTACT),
    m_pContact(ct),m_Index(-1),m_pContactMethod(nullptr),m_Type(ContactTreeNode::NodeType::PERSON),m_pParent(nullptr),m_pModel(parent)
 {
@@ -204,6 +208,13 @@ CategorizedContactModel::~CategorizedContactModel()
    }
 }
 
+CategorizedContactModel* CategorizedContactModel::instance()
+{
+   if (!CategorizedContactModelPrivate::m_spInstance)
+      CategorizedContactModelPrivate::m_spInstance = new CategorizedContactModel();
+   return CategorizedContactModelPrivate::m_spInstance;
+}
+
 QHash<int,QByteArray> CategorizedContactModel::roleNames() const
 {
    static QHash<int, QByteArray> roles = QAbstractItemModel::roleNames();

src/categorizedcontactmodel.h

@@ -68,6 +68,9 @@ public:
    bool       isSortAlphabetical  () const;
    QString    defaultCategory     () const;
 
+   //Singleton
+   static CategorizedContactModel* instance();
+
 private:
    QScopedPointer<CategorizedContactModelPrivate> d_ptr;
    Q_DECLARE_PRIVATE(CategorizedContactModel)