84 lines
2.3 KiB
Plaintext
84 lines
2.3 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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/* TODO: replace calls to _LastRec() and _Recno() with real versions. */
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function TBrowseDb( nTop, nLeft, nBott, nRight )
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local oTb := TBrowseNew( nTop, nLeft, nBott, nRight )
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oTb:SkipBlock := { | n | TBSkip( n ) }
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oTb:GoTopBlock := { || DbGoTop() }
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oTb:GoBottomBlock := {|| DbGoBottom() }
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Return oTb
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static function TbSkip( 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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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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end
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elseif nRecs < 0
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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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end
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endif
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endif
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return nSkipped
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static function _LastRec() // Waiting for those function to become available
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return 0
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static function _RecNo() // Waiting for those function to become available
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return 0
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