preventing editing of List View item's label

How do I prevent user from editing a List View item's label? MSDN says that it can be done by returning TRUE in response to a LVN_BEGINLABELEDIT notification. But this doesn't work. I have following code

Code:

---

switch(msg) {
  case WM_NOTIFY:
    if (((LPNMHDR)lParam)->code == LVN_BEGINLABELEDIT) {
      return TRUE;
    }
    break;
}

---

in my modeless dialog box (with a List View control) procedure.

What is "code?"

Code:

---

reinterpret_cast<LPNMLVDISPINFO>(lParam)->hdr->code == LVN_BEGINLABELEDIT

---

Kuphryn

Quote:

---

[B]NMHDR[/B}

Contains information about a notification message.

Code:

---

typedef struct tagNMHDR {
    HWND hwndFrom;
    UINT idFrom;
    UINT code;
} NMHDR;

---

Members

hwndFrom
Window handle to the control sending a message.

idFrom
Identifier of the control sending a message.

code
Notification code. This member can be a control-specific notification code or it can be one of the common notification codes.

---

The problem is, that the control doesn't react to values I return, not the notificiation message itself.

Try removing the LVS_EDITLABELS style when you create the control.

or try

Code:

---

LView = (NM_LISTVIEW FAR *) lParam;
if(LVN_ENDLABELEDIT==LView->hdr.code)

---

as this cast no longer seems to work

if (((LPNMHDR)lParam)->code == LVN_BEGINLABELEDIT)

Thanks, but I probably didn't express myself clearly. I want only some labels to be uneditable, not all of them, so the LVN_BEGINLABELEDIT style is not going to help me, because it defines the behavior of all the labels.

Also LVN_ENDLABELEDIT notification message isn't the right thing, because it's raised after user edited the label and that's what I want to avoid.

I have to use LVN_BEGINLABELEDIT, but it doesn't care what I return as a response to it, although it should. I use VC++ 6.0 and W2k.

For better image, the List View Control is supposed to be a listing of items, whose names can user edit, except the first item, which is "Insert new item."

Quote:

---

as this cast no longer seems to work
if (((LPNMHDR)lParam)->code == LVN_BEGINLABELEDIT)

---

I don't think so, it works well, the notification is raised.

>>if (((LPNMHDR)lParam)->code == LVN_BEGINLABELEDIT)


This is an incorrect cast. It happens to work now as the first element of the NM_LISTVIEW struct is a NMHDR struct. Will not work if MS changes this struct.

Do you mean you want all the first items (in column zero) uneditable, which realy negates the edit lables style?

Or

You want the first row (or first item in the first row) to be uneditable?

Try to intercept all messages to the first row and discard.

if you want a listview where all the items are editable (except the first) then you will need to write your own with a subclassed wndproc. Just create an edit in the right cell.

I have written one for WIN32 in C but is too complicated to post. Let me know.

As for the typecast, I don't think MS is going to change the NMHDR structure, because it's the LPARAM of WM_NOTIFY message, one of the most essential messages. They'd more likely change the NMLVDISPINFO structure sooner.

Nevermind. The topic is editing a label. If I understand you right, you also didn't make out trying to disable a label on single item using a LVN_BEGINLABELEDIT return value. So they kind of forgot to implement it??

I thought creating my own List View is the last solution, but it seems to be the only one :(

I'd really welcome if you send me your code. I'd use it as a reference if something goes wrong, but probably not copy it, because my program is in C++.

Thanks in advance.

P.S. It seems the forum email system doesn't allow attachments, so here's the address: larrycz@atlas.cz.

look here for an example

http://www.codeproject.com/listctrl/...istcontrol.asp