Treelist: Add a message(s) to get currently selcted item (or items)

[dido2k]

Hi, Martin.

I did not manage to find how to get the treelist selection. I am trying to get the clicked item on NM_DBLCLK notification.

1. HTREEITEM hSelectedItem = TreeView_GetSelection(lpNmHdr->hwndFrom);
2. int iPos = ListView_GetNextItem(lpNmHdr->hwndFrom, -1, LVNI_SELECTED | LVNI_FOCUSED);

But both methods don't work. Would you help a bit?

Kind Regards, Diyan.

[dido2k]

I got it.

GetCursorPos(&pt);
ScreenToClient(lpNmHdr->hwndFrom, &pt);
MC_TLHITTESTINFO hitTestInfo;
ZeroMemory(&hitTestInfo, sizeof(MC_TLHITTESTINFO));
hitTestInfo.pt = pt;
SendMessage(lpNmHdr->hwndFrom, MC_TLM_HITTEST, 0, (LPARAM)&hitTestInfo);
if (hitTestInfo.flags != MC_TLHT_NOWHERE && hitTestInfo.hItem) {
        MC_TLITEM item;
        ZeroMemory(&item, sizeof(MC_TLITEM));
        item.fMask = MC_TLIF...
        SendMessage(lpNmHdr->hwndFrom, MC_TLM_GETITEM, (WPARAM)hitTestInfo.hItem, (LPARAM)&item);```
}

Thanks.

[dido2k]

Not an issue.

[mity]

Humm, reopening. It is an issue.

Having some API for that would be highly useful and lack of it seems as an unintended ommission to me, especially as we have MC_TLM_GETSELECTEDCOUNT.

[mity]

After all, it is implemented. It follows the standard treeview control as a model here, including its possibly not so good naming convention:

The message MC_TLM_GETNEXTITEM accepts the flag MC_TLGN_CARET (in WPARAM), which returns a selected item:

• If LPARAM is NULL, it returns the 1st selected item.

• If LPARAM is not NULL, it returns the next selected item after the one provided. (I believe Vista has added TVGN_NEXTSELECTED for that but this part of our API was possibly designed before Vista. We could add MC_TLGN_NEXTSELECTED for the sake of consistency.)

So, the main difference here is we don't provide the wrapping macros like TreeView_GetSelection(hwnd), which actually is just a synonym for SendMessage(hwnd, TVM_GETNEXTITEM, (WPARAM) TVGN_CARET, (LPARAM) NULL).

[dido2k]

Thank you, Martin. I appreciate It.