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comctl32/listbox: Implement LBS_NODATA for single-selection listboxes. 

The LBS_NODATA style's purpose is to drastically improve performance and
memory usage on very large lists, since they should function as virtual
lists. Thus, don't store any data for single-selection listboxes (descr->items
always NULL).

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=32374
Signed-off-by: Gabriel Ivăncescu <gabrielopcode@gmail.com>
Signed-off-by: Huw Davies <huw@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Gabriel Ivăncescu 2019-02-20 12:05:00 +00:00 committed by Alexandre Julliard
parent e98d4b4502
commit 1b7886edaf
1 changed files with 16 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
dlls/comctl32/listbox.c
View File

@ -19,7 +19,7 @@
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*
* TODO:
* - LBS_NODATA
* - LBS_NODATA for multi-selection listboxes
*/
#include <string.h>
@ -135,17 +135,20 @@ static BOOL resize_storage(LB_DESCR *descr, UINT items_size)
items_size + LB_ARRAY_GRANULARITY * 2 < descr->items_size)
{
items_size = (items_size + LB_ARRAY_GRANULARITY - 1) & ~(LB_ARRAY_GRANULARITY - 1);
items = heap_realloc(descr->items, items_size * sizeof(LB_ITEMDATA));
if (!items)
if ((descr->style & (LBS_NODATA | LBS_MULTIPLESEL | LBS_EXTENDEDSEL)) != LBS_NODATA)
{
SEND_NOTIFICATION(descr, LBN_ERRSPACE);
return FALSE;
items = heap_realloc(descr->items, items_size * sizeof(LB_ITEMDATA));
if (!items)
{
SEND_NOTIFICATION(descr, LBN_ERRSPACE);
return FALSE;
}
descr->items = items;
}
descr->items_size = items_size;
descr->items = items;
}
if ((descr->style & LBS_NODATA) && items_size > descr->nb_items)
if ((descr->style & LBS_NODATA) && descr->items && items_size > descr->nb_items)
{
memset(&descr->items[descr->nb_items], 0,
(items_size - descr->nb_items) * sizeof(LB_ITEMDATA));
@ -190,6 +193,8 @@ static void insert_item_data(LB_DESCR *descr, UINT index, WCHAR *str, ULONG_PTR
{
LB_ITEMDATA *item;
if (!descr->items) return;
item = descr->items + index;
if (index < descr->nb_items)
memmove(item + 1, item, (descr->nb_items - index) * sizeof(LB_ITEMDATA));
@ -204,6 +209,8 @@ static void remove_item_data(LB_DESCR *descr, UINT index)
{
LB_ITEMDATA *item;
if (!descr->items) return;
item = descr->items + index;
if (index < descr->nb_items)
memmove(item, item + 1, (descr->nb_items - index) * sizeof(LB_ITEMDATA));
@ -1762,7 +1769,8 @@ static void LISTBOX_ResetContent( LB_DESCR *descr )
{
INT i;
for(i = descr->nb_items - 1; i>=0; i--) LISTBOX_DeleteItem( descr, i);
if (!(descr->style & LBS_NODATA))
for (i = descr->nb_items - 1; i >= 0; i--) LISTBOX_DeleteItem(descr, i);
HeapFree( GetProcessHeap(), 0, descr->items );
descr->nb_items = 0;
descr->top_item = 0;