Implemented dynamic row adding

The view only adds as many rows as they can be displayed now.
Only scrolling, it adds more

src/contentmanagermodel.cpp

@@ -82,7 +82,7 @@ QModelIndex ContentManagerModel::parent(const QModelIndex &index) const
 int ContentManagerModel::rowCount(const QModelIndex &parent) const
 {
     Q_UNUSED(parent);
-    return m_data.size();
+    return zimCount;
 }
 
 QVariant ContentManagerModel::headerData(int section, Qt::Orientation orientation, int role) const
@@ -150,3 +150,21 @@ bool ContentManagerModel::hasChildren(const QModelIndex &parent) const
     return true;
 }
 
+bool ContentManagerModel::canFetchMore(const QModelIndex &parent) const
+{
+    if (parent.isValid())
+        return false;
+    return (zimCount < m_data.size());
+}
+
+void ContentManagerModel::fetchMore(const QModelIndex &parent)
+{
+    if (parent.isValid())
+        return;
+    int remainder = m_data.size() - zimCount;
+    int zimsToFetch = qMin(5, remainder);
+    beginInsertRows(QModelIndex(), zimCount, zimCount + zimsToFetch - 1);
+    zimCount += zimsToFetch;
+    endInsertRows();
+}
+

src/contentmanagermodel.h

@@ -28,9 +28,14 @@ public:
     void setupNodes();
     bool hasChildren(const QModelIndex &parent) const override;
 
+protected:
+    bool canFetchMore(const QModelIndex &parent) const override;
+    void fetchMore(const QModelIndex &parent) override;
+
 private:
     QList<QMap<QString, QVariant>> m_data;
     Node *rootNode;
+    int zimCount = 0;
 };
 
 #endif // CONTENTMANAGERMODEL_H