Question

I have a list view where I want to disable the horizontal scroll bar.

Basically, I know none of my data will exceed the width of the single column, but if enough entries get added to the list view, the vertical scroll bar pops up, reducing the width available, making the horizontal scroll bar pop up.

I was thinking about some how catching a message right before the vertical scroll bar gets added, and then re-sizing the column to make enough room, but I don’t know what message I would need to catch to do this.

EDIT:
Does anyone know if there is a message sent after an item in a list view is deleted? LVN_ITEMCHANGED appeared to only be sent after an item is added. And LVN_DELETEITEM only before an item is deleted.

Answer 1

Well I worked out one solution.
There is a bug though, if I only remove one item it doesn’t resize the column.

case LVN_DELETEITEM:
{
    LPNMLISTVIEW listView = (LPNMLISTVIEW) lParam;

    // After an item is deleted,
    // if there is not a vertical scroll bar and GWL_USERDATA is TRUE,
    // resize the column back to normal.
    if (!(GetWindowLong(listView->hdr.hwndFrom, GWL_STYLE) & WS_VSCROLL) &&
          GetWindowLong(listView->hdr.hwndFrom, GWL_USERDATA) == TRUE)
    {
        const int ColWidth = ListView_GetColumnWidth(listView->hdr.hwndFrom, 0);
        ListView_SetColumnWidth(listView->hdr.hwndFrom, 0, ColWidth + GetSystemMetrics(SM_CXVSCROLL));
        SetWindowLong(listView->hdr.hwndFrom, GWL_USERDATA, FALSE);
    }

    break;
}

case LVN_ITEMCHANGED:
{
    LPNMLISTVIEW listView = (LPNMLISTVIEW) lParam;

    // After an item is added, if there is a horizontal scrollbar,
    // resize the column and set GWL_USERDATA to TRUE.
    if (GetWindowLong(listView->hdr.hwndFrom, GWL_STYLE) & WS_HSCROLL)
    {
        const int ColWidth = ListView_GetColumnWidth(listView->hdr.hwndFrom, 0);
        ListView_SetColumnWidth(listView->hdr.hwndFrom, 0, ColWidth - GetSystemMetrics(SM_CXVSCROLL));
        SetWindowLong(listView->hdr.hwndFrom, GWL_USERDATA, TRUE);
    }

    break;
}

I’d still love to see a better solution, but this works for now.