QModelIndex ListModel::moveItemHorizontal(const QModelIndex& index, int direction)
{
ListItem* item = itemFromIndex(index);
if (!item)
return index;
ListItem* parent = item->parent();
int row = item->row();
if (direction == App::Left) { // reparent as child of parent's parent
if (!parent || parent->isRoot()) // already top level item
return index;
ListItem* newParent = parent->parent();
int newRow = parent->row() + 1;
QSqlDatabase db = QSqlDatabase::database();
db.transaction();
if (parent->takeChildDb(row) &&
item->setParentDb(newParent, newRow)) {
db.commit();
if (beginMoveRows(indexFromItem(parent), row, row, indexFromItem(newParent), newRow)) {
newParent->insertChild(newRow, parent->takeChild(row));
endMoveRows();
}
return indexFromItem(item);
} else {
db.rollback();
return index;
}
} else { // move as child of previous sibling
ListItem* newParent = parent->child(row - 1);
if (!newParent)
return index;
QSqlDatabase db = QSqlDatabase::database();
db.transaction();
if (parent->takeChildDb(row) &&
item->setParentDb(newParent, newParent->childCount())) {
db.commit();
if (beginMoveRows(indexFromItem(parent), row, row, indexFromItem(newParent), newParent->childCount())) {
newParent->appendChild(parent->takeChild(row));
endMoveRows();
}
newParent->setExpanded(true);
return indexFromItem(item);
} else {
db.rollback();
return index;
}
}
}
QModelIndex ListModel::parent(const QModelIndex& index) const
{
if (!index.isValid()) // root
return QModelIndex();
ListItem* item = itemFromIndex(index);
if (!item)
return QModelIndex();
ListItem* parent = item->parent();
if (parent->isRoot()) // top level item
return QModelIndex();
return createIndex(parent->row(), 0, parent);
}