[haiku-development] Re: Query about BOutlineListView
- From: "Máximo Castañeda" <dmarc-noreply@xxxxxxxxxxxxx> ("antiswen")
- To: "haiku-development@xxxxxxxxxxxxx" <haiku-development@xxxxxxxxxxxxx>
- Date: Sat, 6 Apr 2024 14:54:29 +0000 (UTC)
En sábado, 6 de abril de 2024, 16:05:50 CEST, Zenja Solaja <solaja@xxxxxxxxx>
escribió:
This wont work since BOutlineListView is a tree, so the full list index (eg.
22) doesnt map to a branch BListView subindex with a smaller number of
elements. This was the first thing I tried and immediate got an out of bounds
access error.
BListView Select(idx) wont work for trees. I’m only limited to
BOutlineListView::FullListItemAt(idx) pointers, but that wont allow me to set
the private fLastSelected which is used to remove highlight when the mouse
selects another item.
On Sat, 6 Apr 2024 at 13:23, Máximo Castañeda <dmarc-noreply@xxxxxxxxxxxxx>
wrote:
BListItem* itemToSelect = list.FullListItemAt(fullIndex);
int32 showIndex = list.IndexOf(itemToSelect);
list.Select(showIndex);
You may want to check return values, and maybe call list.Expand(item) before
getting its index.
BOutlineListView is a BListView, so its methods should work. In fact, it keeps
its data as a list with its items having the "depth" information, not as a tree
with items containing a list of children.
Select() checks the index and just returns false if out of bounds, so if you
got an out of bounds error there must be a bug somewhere. Can you share your
code?
Notice in the sample code the index with which you call Select() is not the
same one you started with. If you start with a "full tree" index: you first get
the item with FullListItemAt, the you find the "visible list" index with
IndexOf (a method from BListView) and then you Select using that index. And you
will have to make sure its path is expanded, of course, or its "visible list"
will be -1.
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