KeysFiles: fix WalletKeysFilesModel, should be instantiable QML type

src/qt/KeysFiles.cpp

@@ -81,17 +81,15 @@ quint8 WalletKeysFiles::networkType() const
 WalletKeysFilesModel::WalletKeysFilesModel(QObject *parent)
     : QAbstractListModel(parent)
 {
-    this->m_walletKeysFilesItemModel = qobject_cast<QAbstractItemModel *>(this);
-
-    this->m_walletKeysFilesModelProxy.setSourceModel(this->m_walletKeysFilesItemModel);
+    this->m_walletKeysFilesModelProxy.setSourceModel(this);
     this->m_walletKeysFilesModelProxy.setSortRole(WalletKeysFilesModel::ModifiedRole);
     this->m_walletKeysFilesModelProxy.setDynamicSortFilter(true);
     this->m_walletKeysFilesModelProxy.sort(0, Qt::DescendingOrder);
 }
 
-QSortFilterProxyModel &WalletKeysFilesModel::proxyModel()
+QSortFilterProxyModel *WalletKeysFilesModel::proxyModel()
 {
-    return m_walletKeysFilesModelProxy;
+    return &m_walletKeysFilesModelProxy;
 }
 
 void WalletKeysFilesModel::clear()

src/qt/KeysFiles.h

@@ -56,6 +56,8 @@ private:
 class WalletKeysFilesModel : public QAbstractListModel
 {
     Q_OBJECT
+    Q_PROPERTY(QSortFilterProxyModel *proxyModel READ proxyModel NOTIFY proxyModelChanged)
+
 public:
     enum KeysFilesRoles {
         FileNameRole = Qt::UserRole + 1,
@@ -74,16 +76,20 @@ public:
     void addWalletKeysFile(const WalletKeysFiles &walletKeysFile);
     int rowCount(const QModelIndex & parent = QModelIndex()) const;
 
-    QSortFilterProxyModel &proxyModel();
     QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
     QHash<int, QByteArray> roleNames() const;
 
+private:
+    QSortFilterProxyModel *proxyModel();
+
 protected:
 
+signals:
+    void proxyModelChanged() const;
+
 private:
     QList<WalletKeysFiles> m_walletKeyFiles;
 
-    QAbstractItemModel *m_walletKeysFilesItemModel;
     QSortFilterProxyModel m_walletKeysFilesModelProxy;
 };