[PATCH v5 8/8] comctl32/listbox: Shrink the item array in a helper function

[Gabriel Ivăncescu]

Signed-off-by: Gabriel Ivăncescu 
---
 dlls/comctl32/listbox.c | 33 +++++++++++++++++++--------------
 1 file changed, 19 insertions(+), 14 deletions(-)

diff --git a/dlls/comctl32/listbox.c b/dlls/comctl32/listbox.c
index 3b76e19..41eb631 100644
--- a/dlls/comctl32/listbox.c
+++ b/dlls/comctl32/listbox.c
@@ -148,6 +148,24 @@ static BOOL expand_storage(LB_DESCR *descr, UINT amount)
     return TRUE;
 }

+static void shrink_storage(LB_DESCR *descr)
+{
+    LB_ITEMDATA *p = descr->items;
+    UINT num = descr->nb_items;
+
+    if (num + LB_ARRAY_GRANULARITY * 2 < descr->array_size)
+    {
+        num += LB_ARRAY_GRANULARITY - 1;
+        num -= num % LB_ARRAY_GRANULARITY;
+        p = HeapReAlloc(GetProcessHeap(), 0, p, num * sizeof(LB_ITEMDATA));
+        if (p)
+        {
+            descr->array_size = num;
+            descr->items = p;
+        }
+    }
+}
+
 static BOOL is_item_selected(LB_DESCR *descr, UINT index)
 {
     return descr->items[index].selected;
@@ -1661,7 +1679,6 @@ static void LISTBOX_DeleteItem( LB_DESCR *descr, INT index )
 static LRESULT LISTBOX_RemoveItem( LB_DESCR *descr, INT index )
 {
     LB_ITEMDATA *item;
-    INT max_items;

if ((index < 0) || (index >= descr->nb_items)) return LB_ERR;

@@ -1681,20 +1698,8 @@ static LRESULT LISTBOX_RemoveItem( LB_DESCR *descr, INT index )
                        (descr->nb_items - index) * sizeof(LB_ITEMDATA) );
     if (descr->anchor_item == descr->nb_items) descr->anchor_item--;

-    /* Shrink the item array if possible */
+    shrink_storage(descr);

-    max_items = descr->array_size;
-    if (descr->nb_items < max_items - 2*LB_ARRAY_GRANULARITY)
-    {
-        max_items -= LB_ARRAY_GRANULARITY;
-        item = HeapReAlloc( GetProcessHeap(), 0, descr->items,
-                            max_items * sizeof(LB_ITEMDATA) );
-        if (item)
-        {
-            descr->array_size = max_items;
-            descr->items = item;
-        }
-    }
     /* Repaint the items */

LISTBOX_UpdateScroll( descr );