[PATCH v4 1/4] comctl32/listbox: Move the item data insertion into a separate function

[Huw Davies]

On Mon, Feb 18, 2019 at 03:47:51PM +0200, Gabriel Ivăncescu wrote:
> Signed-off-by: Gabriel Ivăncescu <gabrielopcode at gmail.com>
> ---
> 
> This is a no-op patch. nb_items is incremented before the call and this is
> taken care of in the helper function. This is for two reasons:
> 
> 1) This simplifies the nodata patch (only adds a single line to
> insert_item_data).
> 2) This matches what RemoveItem does, so it's more consistent.
> 
>  dlls/comctl32/listbox.c | 62 ++++++++++++++++++++++-------------------
>  1 file changed, 33 insertions(+), 29 deletions(-)
> 
> diff --git a/dlls/comctl32/listbox.c b/dlls/comctl32/listbox.c
> index 50ff5c5..330d3ae 100644
> --- a/dlls/comctl32/listbox.c
> +++ b/dlls/comctl32/listbox.c
> @@ -176,6 +176,38 @@ static void set_item_selected_state(LB_DESCR *descr, UINT index, BOOL state)
>          descr->items[index].selected = state;
>  }
>  
> +static void insert_item_data(LB_DESCR *descr, INT index, WCHAR *str, ULONG_PTR data)
> +{
> +    LB_ITEMDATA *item;
> +
> +    item = &descr->items[index];
> +
> +    if (index < descr->nb_items - 1)
> +        RtlMoveMemory(item + 1, item,
> +                      (descr->nb_items - 1 - index) * sizeof(LB_ITEMDATA));
> +    item->str      = str;
> +    item->data     = HAS_STRINGS(descr) ? 0 : data;
> +    item->height   = 0;
> +    item->selected = FALSE;
> +
> +    /* Get item height */
> +    if (descr->style & LBS_OWNERDRAWVARIABLE)
> +    {
> +        MEASUREITEMSTRUCT mis;
> +        UINT id = (UINT)GetWindowLongPtrW( descr->self, GWLP_ID );
> +
> +        mis.CtlType    = ODT_LISTBOX;
> +        mis.CtlID      = id;
> +        mis.itemID     = index;
> +        mis.itemData   = data;
> +        mis.itemHeight = descr->item_height;
> +        SendMessageW( descr->owner, WM_MEASUREITEM, id, (LPARAM)&mis );
> +        item->height = mis.itemHeight ? mis.itemHeight : 1;
> +        TRACE("[%p]: measure item %d (%s) = %d\n",
> +              descr->self, index, str ? debugstr_w(str) : "", item->height );
> +    }

Let's leave the OWNERDRAWVARIABLE bit in InsertItem.  insert_item_data() should
just be about manipulating the items array.  You'll want to add a set_item_height()
helper first.

Huw.