filterAcceptRows() is being called for all the top level items in the tree.

[DURGAPRASAD NEELAM]

How would you determine the size of the scrollbar then?

I am not sure exactly, but we can get a signal when we move a scroll bar, I thought of doing it by catching that signal.

If it is not possible, You could suggest some other way as well :-)

@ChrisW67 : we have tried by applying filter on data base this is also taking much time, so I am searching for the solution (like lazy loading I want lazy filtering )

[wysota]

I am not sure exactly, but we can get a signal when we move a scroll bar, I thought of doing it by catching that signal.

Where would you move the scrollbar if you don't know how many entries the model has? If the model filtered only until the view was populated with visible items the scroll bar would think there were no more items available and the scroll bar would not be visible.

[DURGAPRASAD NEELAM]

1. Is it possible to call this function only for the items which are visible currently in a view & then when I scroll down Apply same filter for newly brought items into view ?

2. If it is not possible, You could suggest some other way as well :-)

[wysota]

[SIZE=4]
[B] 1. Is it possible to call this function only for the items which are visible currently in a view & then when I scroll down Apply same filter for newly brought items into view ?

Yes. Subclass QAbstractProxyModel and implement your own proxy.