[PyKDE] iterating over a QListView

[Jim Bublitz]

On Tuesday 22 February 2005 11:35, Christopher J. Bottaro wrote:
> The C++ documentation shows this example:
>
> QPtrList<QListViewItem> lst;
>     QListViewItemIterator it( myListView );
>     while ( it.current() ) {
>         if ( it.current()->isSelected() )
>             lst.append( it.current() );
>         ++it;
>
> I'm wondering if there is a Pythonic way of doing this.  Maybe something
> like:
>
> lst = []
> for listviewitem in listview:
>   if listviewitem.isSelected():
>     lst.append(listviewitem)
>
> or maybe:
>
> lst = []
> for listviewitem in QListViewItemIterator(listview):
>   if listviewitem.isSelected():
>     lst.append(listviewitem)
>
> Or is there no Pythonic way and I just have to translate the C++ directly?
> This question goes for all Qt iterator classes (i.e. are they turned into
> Python iterables by PyQt?).
>
> Thanks for the help.

I think this is what you're asking for (it's just cut and pasted from a 
comp.lang.python post I did a while ago). 'listView' would be a QListView, 
'selectedLVIList' is a Python list of QListViewItems.

--------------------------------------

def getSelectedItems (listView):
    selectedLVIList = []
    listViewItem = listView.firstChild()

    scan(listViewItem, selectedLVIList)

    return selectedLVIList
        
def scan(listViewItem, selectedLVIList):    
    while listViewItem:
        if listViewItem.isSelected():
            selectedLVIList.append(listViewItem)

        scan(listViewItem.firstChild())

        listViewItem = listViewItem.nextSibling()

The docs say that you might not traverse the list view items in sort order
using firstChild/nextSibling. This also doesn't keep track explicitly of
which level an item is on, although you can trace back each item's
parent(s) (or else modify the code to track that).

-------------------------------------

I don't know if that's sufficiently "Pythonic" - you could probably create 
some kind of iterator in a fashion similar to 'scan'.

Jim