QModelIndex
SourcesModel::parent( const QModelIndex& child ) const
{
if( !child.isValid() )
{
return QModelIndex();
}
SourceTreeItem* node = itemFromIndex( child );
SourceTreeItem* parent = node->parent();
if( parent == m_rootItem )
return QModelIndex();
return createIndex( rowForItem( parent ), 0, parent );
}
QModelIndex
SourcesModel::indexFromItem( SourceTreeItem* item ) const
{
if( !item || !item->parent() ) // should never happen..
return QModelIndex();
// reconstructs a modelindex from a sourcetreeitem that is somewhere in the tree
// traverses the item to the root node, then rebuilds the qmodeindices from there back down
// each int is the row of that item in the parent.
/**
* In this diagram, if the \param item is G, childIndexList will contain [0, 2, 0]
*
* A
* D
* E
* F
* G
* H
* B
* C
*
**/
QList< int > childIndexList;
SourceTreeItem* curItem = item;
while( curItem != m_rootItem ) {
int row = rowForItem( curItem );
if( row < 0 ) // something went wrong, bail
return QModelIndex();
childIndexList << row;
curItem = curItem->parent();
}
// qDebug() << "build child index list:" << childIndexList;
// now rebuild the qmodelindex we need
QModelIndex idx;
for( int i = childIndexList.size() - 1; i >= 0 ; i-- ) {
idx = index( childIndexList[ i ], 0, idx );
}
// qDebug() << "Got index from item:" << idx << idx.data( Qt::DisplayRole ).toString();
// qDebug() << "parent:" << idx.parent();
return idx;
}
