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

[wysota]

The kind of lazy loading I am doing is different here, I am not using a fetchMore concept at all.

It doesn't really matter. What matters is what rowCount() returns. The filter proxy will go from 0 to rowCount()-1 rows.

[DURGAPRASAD NEELAM]

It doesn't really matter. What matters is what rowCount() returns. The filter proxy will go from 0 to rowCount()-1 rows.

yes, I got this point. but what I want is, is there any way to stop it and Apply filter on currently viewing items and then when I move my scroll bar down apply the same filter to this new items.

[wysota]

yes, I got this point. but what I want is, is there any way to stop it and Apply filter on currently viewing items and then when I move my scroll bar down apply the same filter to this new items.

How would you determine the size of the scrollbar then?

[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.

[ChrisW67]

The kind of lazy loading I am doing is different here

Yes, you are not lazy loading the top level items, only their children. So you have more than 2 million items loaded into an in-memory model... That it takes some time to filter 2 million records using a brute force approach on un-indexed data through a generic interface is not surprising.

Filtering is the sort of thing that database engines do for a living and you should think about using that.