comctl32: header: Make the column resizing smooth in full drag mode.

Make the column resizing smooth in full drag mode even for listview with lots of elements by redrawing only the resized column and calling UpdateWindow.

comctl32: header: Make the column resizing smooth in full drag mode.
64e5779c · Mikołaj Zalewski · Alexandre Julliard · e48a0a3c · 64e5779c
Commit 64e5779c authored May 22, 2006 by Mikołaj Zalewski Committed by Alexandre Julliard May 23, 2006
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Showing with 18 additions and 7 deletions

header.c dlls/comctl32/header.c +18 -7

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--- a/dlls/comctl32/header.c
+++ b/dlls/comctl32/header.c
@@ -1657,14 +1657,25 @@ HEADER_MouseMove (HWND hwnd, WPARAM wParam, LPARAM lParam)
 	    if (dwStyle & HDS_FULLDRAG) {
                if (!HEADER_SendHeaderNotifyT (hwnd, HDN_ITEMCHANGINGW, infoPtr->iMoveItem, HDI_WIDTH, NULL))
 		{
-		nWidth = pt.x - infoPtr->items[infoPtr->iMoveItem].rect.left + infoPtr->xTrackOffset;
-		if (nWidth < 0)
-		  nWidth = 0;
-		infoPtr->items[infoPtr->iMoveItem].cxy = nWidth;
-                        HEADER_SendHeaderNotifyT(hwnd, HDN_ITEMCHANGEDW, infoPtr->iMoveItem, HDI_WIDTH, NULL);
+                    HEADER_ITEM *lpItem = &infoPtr->items[infoPtr->iMoveItem];
+                    INT nOldWidth = lpItem->rect.right - lpItem->rect.left;
+                    RECT rcClient;
+                    RECT rcScroll;
+                    
+                    nWidth = pt.x - lpItem->rect.left + infoPtr->xTrackOffset;
+                    if (nWidth < 0) nWidth = 0;
+                    infoPtr->items[infoPtr->iMoveItem].cxy = nWidth;
+                    HEADER_SetItemBounds(hwnd);
+                    
+                    GetClientRect(hwnd, &rcClient);
+                    rcScroll = rcClient;
+                    rcScroll.left = lpItem->rect.left + nOldWidth;
+                    ScrollWindowEx(hwnd, nWidth - nOldWidth, 0, &rcScroll, &rcClient, NULL, NULL, 0);
+                    InvalidateRect(hwnd, &lpItem->rect, FALSE);
+                    UpdateWindow(hwnd);
+                    
+                    HEADER_SendHeaderNotifyT(hwnd, HDN_ITEMCHANGEDW, infoPtr->iMoveItem, HDI_WIDTH, NULL);
 		}
-		HEADER_SetItemBounds (hwnd);
-		InvalidateRect(hwnd, NULL, FALSE);
 	    }
 	    else {
 		hdc = GetDC (hwnd);