74 lines
1.8 KiB
Plaintext
74 lines
1.8 KiB
Plaintext
/*
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* $Id$
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*/
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/*
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* Harbour Class TBrowse
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* Copyright(C) 1999 by Paul Tucker <ptucker@sympatico.ca>
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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
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the 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
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* License along with this program; if not, write to:
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*
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* The Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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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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