Is it possible to show only certain indexes of a QML listview?

Question

Is it possible to show only certain indexes or a range of indexes in QML listviews?

I have a listmodel that has a bunch of info that I am reusing. Would it be possible to have a list showing, for example, only indices 5 to 8?

Answer 1

You could accomplish that by setting the delegate visibility to false on certain conditions:

  Grid {
    anchors.fill: parent
    rows: 4
    columns: 5
    spacing: 5
    Repeater {
      model: 20
      delegate: Rectangle {
        width: 50
        height: 50
        visible: index >= 5 && index <= 8 // show only certain indices
        Text {
          anchors.centerIn: parent
          text: index
        }
      }
    }
  }

It will have some overhead of creating hidden items in memory thou, so not optimal if you deal with very large models and showing only small portions of them.

Answer 2

Yes, it is possible. You need to override QSortFilterProxyModel::filterAcceptRow method.

MyFilterModel::filterAcceptsRow ( int source_row, const QModelIndex & source_parent ) const
{
  if ( source_row > 5 && source_row < 8 )
    return true;

  return false;
}
//...
MyFilterModel *filter = new MyFilterModel();
filter->setSourceMoldel( yourSourceModel );
view->setModel( filter );