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Factor out the computation of item position, so it can be used 

independently of the rectangles.
This commit is contained in:
Dimitrie O. Paun 2002-10-10 02:58:47 +00:00 committed by Alexandre Julliard
parent f29d0ce05b
commit b8d5715bc1
1 changed files with 59 additions and 34 deletions
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93
dlls/comctl32/listview.c
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@ -1247,6 +1247,49 @@ static void LISTVIEW_UnsupportedStyles(LONG lStyle)
FIXME(" LVS_SORTDESCENDING\n");
}
/***
* DESCRIPTION: [INTERNAL]
* Computes an item's (left,top) corner, relative to rcView.
* That is, the position has NOT been made relative to the Origin.
* This is deliberate, to avoid computing the Origin over, and
* over again, when this function is call in a loop. Instead,
* one ca factor the computation of the Origin before the loop,
* and offset the value retured by this function, on every iteration.
*
* PARAMETER(S):
* [I] infoPtr : valid pointer to the listview structure
* [I] nItem : item number
* [O] lpptOrig : item top, left corner
*
* RETURN:
* TRUE if computations OK
* FALSE otherwise
*/
static BOOL LISTVIEW_GetItemListOrigin(LISTVIEW_INFO *infoPtr, INT nItem, LPPOINT lpptPosition)
{
UINT uView = infoPtr->dwStyle & LVS_TYPEMASK;
if ((uView == LVS_SMALLICON) || (uView == LVS_ICON))
{
lpptPosition->x = (LONG)DPA_GetPtr(infoPtr->hdpaPosX, nItem);
lpptPosition->y = (LONG)DPA_GetPtr(infoPtr->hdpaPosY, nItem);
}
else if (uView == LVS_LIST)
{
INT nCountPerColumn = LISTVIEW_GetCountPerColumn(infoPtr);
lpptPosition->x = nItem / nCountPerColumn * infoPtr->nItemWidth;
lpptPosition->y = nItem % nCountPerColumn * infoPtr->nItemHeight;
}
else /* LVS_REPORT */
{
lpptPosition->x = REPORT_MARGINX;
lpptPosition->y = nItem * infoPtr->nItemHeight;
}
return TRUE;
}
/***
* DESCRIPTION: [INTERNAL]
* Compute the rectangles of an item. This is to localize all
@ -1288,12 +1331,9 @@ static BOOL LISTVIEW_GetItemMeasures(LISTVIEW_INFO *infoPtr, INT nItem,
BOOL doIcon = FALSE, doLabel = FALSE, oversizedBox = FALSE;
WCHAR szDispText[DISP_TEXT_SIZE] = { '\0' };
RECT Box, Icon, Label;
POINT Origin;
POINT Position, Origin;
LVITEMW lvItem;
/* This should be very cheap to compute */
if (!LISTVIEW_GetOrigin(infoPtr, &Origin)) return FALSE;
/* Be smart and try to figure out the minimum we have to do */
if (lprcBounds)
{
@ -1306,30 +1346,6 @@ static BOOL LISTVIEW_GetItemMeasures(LISTVIEW_INFO *infoPtr, INT nItem,
if (lprcLabel) doLabel = TRUE;
if (doLabel || lprcIcon) doIcon = TRUE;
/************************************************************/
/* compute the box rectangle (it should be cheap to do) */
/************************************************************/
if ((uView == LVS_SMALLICON) || (uView == LVS_ICON))
{
Box.left = (LONG)DPA_GetPtr(infoPtr->hdpaPosX, nItem);
Box.top = (LONG)DPA_GetPtr(infoPtr->hdpaPosY, nItem);
}
else if (uView == LVS_LIST)
{
INT nCountPerColumn = LISTVIEW_GetCountPerColumn(infoPtr);
Box.left = nItem / nCountPerColumn * infoPtr->nItemWidth;
Box.top = nItem % nCountPerColumn * infoPtr->nItemHeight;
}
else /* LVS_REPORT */
{
Box.left = REPORT_MARGINX;
Box.top = nItem * infoPtr->nItemHeight;
}
Box.left += Origin.x;
Box.top += Origin.y;
Box.right = Box.left + infoPtr->nItemWidth;
Box.bottom = Box.top + infoPtr->nItemHeight;
/* get what we need from the item before hand, so we make
* only one request. This can speed up things, if data
* is stored on the app side */
@ -1345,6 +1361,16 @@ static BOOL LISTVIEW_GetItemMeasures(LISTVIEW_INFO *infoPtr, INT nItem,
if (!LISTVIEW_GetItemW(infoPtr, &lvItem)) return FALSE;
}
/************************************************************/
/* compute the box rectangle (it should be cheap to do) */
/************************************************************/
if (!LISTVIEW_GetItemListOrigin(infoPtr, nItem, &Position)) return FALSE;
if (!LISTVIEW_GetOrigin(infoPtr, &Origin)) return FALSE;
Box.left = Position.x + Origin.x;
Box.top = Position.y + Origin.y;
Box.right = Box.left + infoPtr->nItemWidth;
Box.bottom = Box.top + infoPtr->nItemHeight;
/************************************************************/
/* compute ICON bounding box (ala LVM_GETITEMRECT) */
/************************************************************/
@ -4958,22 +4984,21 @@ static BOOL LISTVIEW_GetItemExtT(LISTVIEW_INFO *infoPtr, LPLVITEMW lpLVItem, BOO
static BOOL LISTVIEW_GetItemPosition(LISTVIEW_INFO *infoPtr, INT nItem, LPPOINT lpptPosition)
{
UINT uView = infoPtr->dwStyle & LVS_TYPEMASK;
RECT Box;
POINT Origin;
TRACE("(nItem=%d, lpptPosition=%p)\n", nItem, lpptPosition);
if (!lpptPosition || nItem < 0 || nItem >= infoPtr->nItemCount) return FALSE;
if (!LISTVIEW_GetItemListOrigin(infoPtr, nItem, lpptPosition)) return FALSE;
if (!LISTVIEW_GetOrigin(infoPtr, &Origin)) return FALSE;
/* These should be very cheap to compute */
if (!LISTVIEW_GetItemMeasures(infoPtr, nItem, &Box, NULL, NULL, NULL)) return FALSE;
lpptPosition->x = Box.left;
lpptPosition->y = Box.top;
if (uView == LVS_ICON)
{
lpptPosition->x += (infoPtr->iconSpacing.cx - infoPtr->iconSize.cx) / 2;
lpptPosition->y += ICON_TOP_PADDING;
}
lpptPosition->x += Origin.x;
lpptPosition->y += Origin.y;
TRACE (" lpptPosition=%s\n", debugpoint(lpptPosition));
return TRUE;