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Programmatically scroll in CListView

winmeister
winmeister asked
on
Medium Priority
1,658 Views
Last Modified: 2013-11-20
In a CListView, I can programmatically select an item by this instruction:

ListCtrl.SetItemState(nItem,LVIS_SELECTED|LVIS_FOCUSED,LVIS_SELECTED|LVIS_FOCUSED);

The matter is that if the item is not  currently in  view, the list control doesn't scroll.

Another problem (but reltaed to the first one) is that MFC has a CListCtrl::GetTopIndex() function, but doen't have the corresponding SetTopIndex().

How can I programmatically scroll the events in the ListCtrl associated with a CListView?

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Tommy HuiEngineer

Commented:
Use CListCtrl::EnsureVisible(). You can make sure an item is visible and whether partially visible is okay or not.

Author

Commented:
This is only partially true. How can I get the item as the first in the scroll view? I mean, I'd like to have a function similar to SetTopIndex(nItem).......
Commented:
Did you try the Scroll function in CListCtrl?
You can try something like this:

CRect   ItemRect;
CRect   TopRect;

// Let the control do most of the work
ListCtrl.EnsureVisible( Index, FALSE );

CurTop = ListCtrl.GetTopIndex();
if( CurTop == Index )
    return;     // Already finished
ListCtrl.GetItemRect( CurTop, TopRect, LVIR_BOUNDS );
ListCtrl.GetItemRect( Index, ItemRect, LVIR_BOUNDS );
ListCtrl.Scroll( CSize(0, (TopRect.top - ItemRect.top) * ItemRect.Height()) );

Note: I don't believe this will always guarantee that the desired index is always at the top. I don't think the list control will scroll past the end of the list. For example, if the desired index is the last in the control, it won't be displayed anywhere except at the lowest position possible in the window.

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