int TreeModel::rowCount(const QModelIndex &parent) const
{
if (parent.isValid() && parent.column() != 0)
return 0;
TaskItem *parentItem = itemForIndex(parent);
return parentItem ? parentItem->childCount() : 0;
}
QModelIndex TreeModel::moveDown(const QModelIndex &index)
{
if (!index.isValid())
return index;
TaskItem *item = itemForIndex(index);
Q_ASSERT(item);
TaskItem *parent = item->parent();
int newRow = index.row() + 1;
if (!parent || parent->childCount() <= newRow)
return index;
return moveItem(parent, index.row(), newRow);
}
QModelIndex TreeModel::demote(const QModelIndex &index)
{
if (!index.isValid())
return index;
TaskItem *item = itemForIndex(index);
Q_ASSERT(item);
TaskItem *parent = item->parent();
Q_ASSERT(parent);
int row = parent->rowOfChild(item);
if (row == 0)
return index; // No preceding sibling to move this under
TaskItem *child = parent->takeChild(row);
Q_ASSERT(child == item);
TaskItem *sibling = parent->childAt(row - 1);
Q_ASSERT(sibling);
sibling->addChild(child);
QModelIndex newIndex = createIndex(sibling->childCount() - 1, 0,
child);
emit dataChanged(newIndex, newIndex);
return newIndex;
}
