_PAGEDOWN, 0) ;
break ;
}
return 0 ;
case WM_MOUSEWHEEL:
if (iDeltaPerLine == 0)
break ;
iAccumDelta += (short) HIWORD (wParam) ; // 120 or -120
while (iAccumDelta >= iDeltaPerLine)
{
SendMessage (hwnd, WM_VSCROLL, SB_LINEUP, 0) ;
iAccumDelta -= iDeltaPerLine ;
}
while (iAccumDelta <= -iDeltaPerLine)
{
SendMessage (hwnd, WM_VSCROLL, SB_LINEDOWN, 0) ;
iAccumDelta += iDeltaPerLine ;
}
return 0 ;
case WM_PAINT :
hdc = BeginPaint (hwnd, &ps) ;
// Get vertical scroll bar position
si.cbSize = sizeof (si) ;
si.fMask = SIF_POS ;
GetScrollInfo (hwnd, SB_VERT, &si) ;
iVertPos = si.nPos ;
// Get horizontal scroll bar position
GetScrollInfo (hwnd, SB_HORZ, &si) ;
iHorzPos = si.nPos ;
// Find painting limits
iPaintBeg = max (0, iVertPos + ps.rcPaint.top / cyChar) ;
iPaintEnd = min (NUMLINES - 1,
iVertPos + ps.rcPaint.bottom / cyChar) ;
for (i = iPaintBeg ; i <= iPaintEnd ; i++)
{
x = cxChar * (1 - iHorzPos) ;
y = cyChar * (i - iVertPos) ;
TextOut ( hdc, x, y,
sysmetrics[i].szLabel,
lstrlen (sysmetrics[i].szLabel)) ;
TextOut ( hdc, |