Expanding some branches of a treeview

tony67

Hi All,
in my code I produce a then push it onto a tree view as below

//your code here

header

    QStandardItemModel tree_model;

header

//your code here

source

    QStandardItem* item;
    for( unsigned int i = 0; i < score.win_element_list.size( ); i++ )
    {

/*
        if( ( int ) score.win_element_list.at( i ).data_a > current_level )
        {
             current_level++;
             sub_level = 0;
             level_number = QString::number( current_level );

                QString level = "level " + level_number;
                item = new QStandardItem( QString( level ) );


                QString wording = "Element\t\t";
                wording += QString::number( sub_level );
                QStandardItem* function = new QStandardItem( QString( wording ));
                item->appendRow( function );



........
then at end I use

tree_model.setItem( column, 0, item);

which produces the tree as needed.
However when I call this draw function ( after I've added new elements ect ) I lose all the expanded branches of my tree. However I've stored if a branch is expanded as a variable. Is there some way I can step through treeview or QStandardItemModel. I've check the documents and can see QTreeView::setExpanded but I can't work out how to get QModelIndex from treeview or QStandardItemModel. Can anyone advise please? Thanks

mrjj

Hi
Im not 100% sure what question is, but you can use index (in the model) function to get QModelIndex.
This function will expand a parent and all sub.childs.

void MainWindow::expandNode(const QModelIndex &parentIndex, bool expand) {
  tree->setExpanded(parentIndex, expand);
  for (qint32 rowNum = 0; rowNum < treeModel->rowCount(parentIndex); ++rowNum) {
    QModelIndex childIndex = treeModel->index(rowNum, 0, parentIndex);
    tree->setExpanded(childIndex, expand);
    expandNode(childIndex);
  }
}