77 lines
2.2 KiB
Plaintext
77 lines
2.2 KiB
Plaintext
/*
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* $Id$
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*/
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/*
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* Harbour Project source code:
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* TBROWSEDB() function
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*
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* Copyright 1999 Paul Tucker <ptucker@sympatico.ca>
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* www - http://www.harbour-project.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version, with one exception:
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*
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* The exception is that if you link the Harbour Runtime Library (HRL)
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* and/or the Harbour Virtual Machine (HVM) with other files to produce
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* an executable, this does not by itself cause the resulting executable
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* to be covered by the GNU General Public License. Your use of that
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* executable is in no way restricted on account of linking the HRL
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* and/or HVM code into it.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA (or visit
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* their web site at http://www.gnu.org/).
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*
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*/
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#include "hbsetup.ch"
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FUNCTION TBrowseDB( nTop, nLeft, nBottom, nRight )
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LOCAL oBrowse := TBrowseNew( nTop, nLeft, nBottom, nRight )
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oBrowse:SkipBlock := { | nRecs | Skipped( nRecs ) }
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oBrowse:GoTopBlock := { || dbGoTop() }
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oBrowse:GoBottomBlock := { || dbGoBottom() }
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RETURN oBrowse
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STATIC FUNCTION Skipped( nRecs )
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LOCAL nSkipped := 0
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IF LastRec() != 0
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IF nRecs == 0
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dbSkip( 0 )
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ELSEIF nRecs > 0 .AND. RecNo() != LastRec() + 1
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DO WHILE nSkipped < nRecs
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dbSkip( 1 )
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IF Eof()
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dbSkip( -1 )
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EXIT
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ENDIF
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nSkipped++
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ENDDO
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ELSEIF nRecs < 0
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DO WHILE nSkipped > nRecs
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dbSkip( -1 )
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IF Bof()
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EXIT
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ENDIF
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nSkipped--
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ENDDO
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ENDIF
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ENDIF
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RETURN nSkipped
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