Listview S4
Dimitrie O. Paun
dpaun at rogers.com
Wed Oct 16 22:32:56 CDT 2002
OK,
This one is tricky. Up till now, ranges where defined as [lower, upper],
that is, lower, and upper inclusive. For a variaty of reasons, it's
better to have them [lower, upper) (i.e. upper *exclusive).
This patch tries to achive that. It should be a noop, but it is easy
to see how a off-by-one error can slip in. I've tested it here,
looks fine, but I'm very interested to hear if you experience any
problems with selection, or refreshes.
ChangeLog
Change the definition of ranges to exclude the upper bound.
--- dlls/comctl32/listview.c.S3 Wed Oct 16 22:34:13 2002
+++ dlls/comctl32/listview.c Wed Oct 16 23:26:07 2002
@@ -442,7 +442,7 @@
if (lprng)
{
char* buf = debug_getbuf();
- snprintf(buf, DEBUG_BUFFER_SIZE, "(%d, %d)", lprng->lower, lprng->upper);
+ snprintf(buf, DEBUG_BUFFER_SIZE, "[%d, %d)", lprng->lower, lprng->upper);
return buf;
} else return "(null)";
}
@@ -701,6 +701,20 @@
static BOOL ranges_del(RANGES ranges, RANGE range);
static void ranges_dump(RANGES ranges);
+static inline BOOL ranges_additem(RANGES ranges, INT nItem)
+{
+ RANGE range = { nItem, nItem + 1 };
+
+ return ranges_add(ranges, range);
+}
+
+static inline BOOL ranges_delitem(RANGES ranges, INT nItem)
+{
+ RANGE range = { nItem, nItem + 1 };
+
+ return ranges_del(ranges, range);
+}
+
/***
* ITERATOR DOCUMENTATION
*
@@ -778,7 +792,7 @@
i->nItem++;
testitem:
if (i->nItem == i->nSpecial) i->nItem++;
- if (i->nItem <= i->range.upper) return TRUE;
+ if (i->nItem < i->range.upper) return TRUE;
pickarange:
if (i->ranges)
@@ -787,7 +801,7 @@
i->range = *(RANGE*)DPA_GetPtr(i->ranges->hdpa, i->index++);
else goto end;
}
- else if (i->nItem > i->range.upper) goto end;
+ else if (i->nItem >= i->range.upper) goto end;
i->nItem = i->range.lower;
if (i->nItem >= 0) goto testitem;
@@ -818,8 +832,8 @@
return FALSE;
}
- i->nItem--;
testitem:
+ i->nItem--;
if (i->nItem == i->nSpecial) i->nItem--;
if (i->nItem >= i->range.lower) return TRUE;
@@ -833,7 +847,7 @@
else if (!start && i->nItem < i->range.lower) goto end;
i->nItem = i->range.upper;
- if (i->nItem >= 0) goto testitem;
+ if (i->nItem > 0) goto testitem;
end:
return (i->nItem = i->nSpecial) != -1;
}
@@ -901,11 +915,12 @@
rcItem.right = rcItem.left + infoPtr->nItemWidth;
rcItem.bottom = rcItem.top + infoPtr->nItemHeight;
if (IntersectRect(&rcTemp, &rcItem, &frame))
- {
- RANGE item_range = { nItem, nItem };
- ranges_add(i->ranges, item_range);
- TRACE(" icon=%d\n", nItem);
- }
+ ranges_additem(i->ranges, nItem);
+ }
+ if (TRACE_ON(listview))
+ {
+ TRACE(" icon items:\n");
+ ranges_dump(i->ranges);
}
return TRUE;
}
@@ -920,7 +935,7 @@
upper = min((frame.bottom - 1) / infoPtr->nItemHeight, infoPtr->nItemCount - 1);
if (upper < lower) return TRUE;
i->range.lower = lower;
- i->range.upper = upper;
+ i->range.upper = upper + 1;
TRACE(" report=%s\n", debugrange(&i->range));
}
else
@@ -944,7 +959,7 @@
{
item_range.lower = nCol * nPerCol + nFirstRow;
if(item_range.lower >= infoPtr->nItemCount) break;
- item_range.upper = min(nCol * nPerCol + nLastRow, infoPtr->nItemCount - 1);
+ item_range.upper = min(nCol * nPerCol + nLastRow + 1, infoPtr->nItemCount);
TRACE(" list=%s\n", debugrange(&item_range));
ranges_add(i->ranges, item_range);
}
@@ -993,10 +1008,7 @@
rcItem.right = rcItem.left + infoPtr->nItemWidth;
rcItem.bottom = rcItem.top + infoPtr->nItemHeight;
if (!RectVisible(hdc, &rcItem))
- {
- RANGE item_range = { i->nItem, i->nItem };
- ranges_del(i->ranges, item_range);
- }
+ ranges_delitem(i->ranges, i->nItem);
}
/* the iterator should restart on the next iterator_next */
@@ -2154,15 +2166,15 @@
* [I] flags : flags
*
* RETURNS:
- * >0 : if Item 1 > Item 2
- * <0 : if Item 2 > Item 1
- * 0 : if Item 1 == Item 2
+ * > 0 : if range 1 > range 2
+ * < 0 : if range 2 > range 1
+ * = 0 : if range intersects range 2
*/
static INT CALLBACK ranges_cmp(LPVOID range1, LPVOID range2, LPARAM flags)
{
- if (((RANGE*)range1)->upper < ((RANGE*)range2)->lower)
+ if (((RANGE*)range1)->upper <= ((RANGE*)range2)->lower)
return -1;
- if (((RANGE*)range2)->upper < ((RANGE*)range1)->lower)
+ if (((RANGE*)range2)->upper <= ((RANGE*)range1)->lower)
return 1;
return 0;
}
@@ -2195,7 +2207,7 @@
static inline BOOL ranges_contain(RANGES ranges, INT nItem)
{
- RANGE srchrng = { nItem, nItem };
+ RANGE srchrng = { nItem, nItem + 1 };
TRACE("(nItem=%d)\n", nItem);
if (TRACE_ON(listview)) ranges_dump(ranges);
@@ -2209,7 +2221,7 @@
for (i = 0; i < ranges->hdpa->nItemCount; i++)
{
RANGE *sel = DPA_GetPtr(ranges->hdpa, i);
- count += sel->upper - sel->lower + 1;
+ count += sel->upper - sel->lower;
}
return count;
@@ -2217,12 +2229,9 @@
static BOOL ranges_shift(RANGES ranges, INT nItem, INT delta, INT nUpper)
{
- RANGE srchrng, *chkrng;
+ RANGE srchrng = { nItem, nItem + 1 }, *chkrng;
INT index;
- srchrng.upper = nItem;
- srchrng.lower = nItem;
-
index = DPA_Search(ranges->hdpa, &srchrng, 0, ranges_cmp, 0, DPAS_SORTED | DPAS_INSERTAFTER);
if (index == -1) return TRUE;
@@ -2231,8 +2240,8 @@
chkrng = DPA_GetPtr(ranges->hdpa, index);
if (chkrng->lower >= nItem)
chkrng->lower = max(min(chkrng->lower + delta, nUpper - 1), 0);
- if (chkrng->upper >= nItem)
- chkrng->upper = max(min(chkrng->upper + delta, nUpper - 1), 0);
+ if (chkrng->upper > nItem)
+ chkrng->upper = max(min(chkrng->upper + delta, nUpper), 0);
}
return TRUE;
}
@@ -2350,13 +2359,13 @@
else if ( (chkrgn->upper <= remrgn.upper) &&
(chkrgn->lower < remrgn.lower) )
{
- chkrgn->upper = remrgn.lower - 1;
+ chkrgn->upper = remrgn.lower;
}
/* case 4: overlap lower */
else if ( (chkrgn->upper > remrgn.upper) &&
(chkrgn->lower >= remrgn.lower) )
{
- chkrgn->lower = remrgn.upper + 1;
+ chkrgn->lower = remrgn.upper;
}
/* case 5: fully internal */
else
@@ -2365,8 +2374,8 @@
if (!newrgn) return FALSE;
tmprgn = *chkrgn;
newrgn->lower = chkrgn->lower;
- newrgn->upper = remrgn.lower - 1;
- chkrgn->lower = remrgn.upper + 1;
+ newrgn->upper = remrgn.lower;
+ chkrgn->lower = remrgn.upper;
DPA_InsertPtr(ranges->hdpa, index, newrgn);
chkrgn = &tmprgn;
}
@@ -2822,15 +2831,13 @@
/* and the selection is the only other state a virtual list may hold */
if (lpLVItem->stateMask & LVIS_SELECTED)
{
- RANGE range = { lpLVItem->iItem, lpLVItem->iItem };
-
if (lpLVItem->state & LVIS_SELECTED)
{
if (lStyle & LVS_SINGLESEL) LISTVIEW_RemoveAllSelections(infoPtr, lpLVItem->iItem);
- ranges_add(infoPtr->selectionRanges, range);
+ ranges_additem(infoPtr->selectionRanges, lpLVItem->iItem);
}
else
- ranges_del(infoPtr->selectionRanges, range);
+ ranges_delitem(infoPtr->selectionRanges, lpLVItem->iItem);
}
/* notify the parent now that things have changed */
@@ -2923,17 +2930,15 @@
if (uChanged & LVIF_STATE)
{
- RANGE range = { lpLVItem->iItem, lpLVItem->iItem };
-
lpItem->state &= ~lpLVItem->stateMask;
lpItem->state |= (lpLVItem->state & lpLVItem->stateMask);
if (lpLVItem->state & lpLVItem->stateMask & ~infoPtr->uCallbackMask & LVIS_SELECTED)
{
if (lStyle & LVS_SINGLESEL) LISTVIEW_RemoveAllSelections(infoPtr, lpLVItem->iItem);
- ranges_add(infoPtr->selectionRanges, range);
+ ranges_additem(infoPtr->selectionRanges, lpLVItem->iItem);
}
else if (lpLVItem->stateMask & LVIS_SELECTED)
- ranges_del(infoPtr->selectionRanges, range);
+ ranges_delitem(infoPtr->selectionRanges, lpLVItem->iItem);
/* if we are asked to change focus, and we manage it, do it */
if (lpLVItem->state & lpLVItem->stateMask & ~infoPtr->uCallbackMask & LVIS_FOCUSED)
@@ -3341,8 +3346,9 @@
RANGE range = iterator_range(&i);
NMLVCACHEHINT nmlv;
+ ZeroMemory(&nmlv, sizeof(NMLVCACHEHINT));
nmlv.iFrom = range.lower;
- nmlv.iTo = range.upper;
+ nmlv.iTo = range.upper - 1;
notify_hdr(infoPtr, LVN_ODCACHEHINT, &nmlv.hdr);
}
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