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/***************************************************************************
kbufferlayout.cpp - description
-------------------
begin : Thu Jun 12 2003
copyright : (C) 2003 by Friedrich W. H. Kossebau
email : [email protected]
***************************************************************************/
/***************************************************************************
* *
* This library is free software; you can redistribute it and/or *
* modify it under the terms of the GNU Library General Public *
* License version 2 as published by the Free Software Foundation. *
* *
***************************************************************************/
#include "kbufferlayout.h"
using namespace KHE;
TDEBufferLayout::TDEBufferLayout( int NoBpL, int SO, int L )
: NoOfBytesPerLine( NoBpL ),
StartOffset( SO ),
Length( L )
{
calcStart();
calcEnd();
}
TDEBufferLayout::~TDEBufferLayout()
{
}
bool TDEBufferLayout::setStartOffset( int SO )
{
// rejecting <0
if( SO < 0 )
SO = 0;
if( StartOffset == SO )
return false;
StartOffset = SO;
calcStart();
calcEnd();
return true;
}
bool TDEBufferLayout::setNoOfBytesPerLine( int N )
{
// rejecting <1
if( N < 1 )
N = 1;
// no changes?
if( NoOfBytesPerLine == N )
return false;
NoOfBytesPerLine = N;
calcStart();
calcEnd();
return true;
}
bool TDEBufferLayout::setLength( int L )
{
// rejecting < 0
if( L < 0 )
L = 0;
// no changes?
if( Length == L )
return false;
Length = L;
calcEnd();
return true;
}
void TDEBufferLayout::setNoOfLinesPerPage( int N )
{
NoOfLinesPerPage = N;
}
void TDEBufferLayout::calcStart()
{
ContentCoords.setStart( TDEBufferCoord(StartOffset,NoOfBytesPerLine,false) );
}
void TDEBufferLayout::calcEnd()
{
ContentCoords.setEnd( (Length>0)?TDEBufferCoord(Length-1+StartOffset,NoOfBytesPerLine,false):
TDEBufferCoord(-1,ContentCoords.start().line()) );
}
int TDEBufferLayout::indexAtCLineStart( int L ) const
{
return ( L <= ContentCoords.start().line() ) ? 0:
( L > ContentCoords.end().line() ) ? Length-1:
L * NoOfBytesPerLine - StartOffset;
}
int TDEBufferLayout::indexAtCLineEnd( int L ) const
{
return ( L < ContentCoords.start().line() ) ? 0:
( L >= ContentCoords.end().line() ) ? Length-1:
(L+1)*NoOfBytesPerLine-StartOffset-1;
}
int TDEBufferLayout::indexAtCCoord( const TDEBufferCoord &C ) const
{
int Index = indexAtCoord( C );
return ( Index <= 0 ) ? 0:
( Index >= Length ) ? Length-1:
Index;
}
int TDEBufferLayout::lineAtCIndex( int Index ) const
{
return ( Index <= 0 ) ? ContentCoords.start().line():
( Index >= Length ) ? ContentCoords.end().line():
lineAtIndex(Index);
}
TDEBufferCoord TDEBufferLayout::coordOfCIndex( int Index ) const
{
return ( Index <= 0 ) ? ContentCoords.start():
( Index >= Length ) ? ContentCoords.end():
coordOfIndex(Index);
}
int TDEBufferLayout::indexAtLineStart( int L ) const
{
return ( L == ContentCoords.start().line() ) ? 0 : L*NoOfBytesPerLine-StartOffset;
}
int TDEBufferLayout::indexAtLineEnd( int L ) const
{
return ( L == ContentCoords.end().line() ) ? Length-1 : (L+1)*NoOfBytesPerLine-StartOffset-1;
}
int TDEBufferLayout::indexAtCoord( const TDEBufferCoord &C ) const
{
return C.indexByLineWidth( NoOfBytesPerLine ) - StartOffset;
}
int TDEBufferLayout::lineAtIndex( int Index ) const
{
return (Index+StartOffset)/NoOfBytesPerLine;
}
TDEBufferCoord TDEBufferLayout::coordOfIndex( int Index ) const
{
return TDEBufferCoord( Index+StartOffset, NoOfBytesPerLine, false );
}
int TDEBufferLayout::correctIndex( int I ) const
{
return ( I <= 0 ) ? 0:
( I >= Length ) ? Length-1:
I;
}
TDEBufferCoord TDEBufferLayout::correctCoord( const TDEBufferCoord &C ) const
{
return ( C <= ContentCoords.start() ) ? ContentCoords.start():
( C >= ContentCoords.end() ) ? ContentCoords.end():
( C.pos() >= NoOfBytesPerLine ) ? TDEBufferCoord( NoOfBytesPerLine-1, C.line() ):
C;
}
bool TDEBufferLayout::atLineStart( const TDEBufferCoord &C ) const
{
return ( C.line() == ContentCoords.start().line() ) ? C.pos() == ContentCoords.start().pos():
C.pos() == 0;
}
bool TDEBufferLayout::atLineEnd( const TDEBufferCoord &C ) const
{
return ( C.line() == ContentCoords.end().line() ) ? C.pos() == ContentCoords.end().pos():
C.pos() == NoOfBytesPerLine-1;
}
KSection TDEBufferLayout::positions( int Line ) const
{
return KSection( firstPos(Line), lastPos(Line) );
}
int TDEBufferLayout::firstPos( const TDEBufferCoord &C ) const
{
return ( ContentCoords.start().isLaterInLineThan(C) ) ? ContentCoords.start().pos() : C.pos();
}
int TDEBufferLayout::lastPos( const TDEBufferCoord &C ) const
{
return ( ContentCoords.end().isPriorInLineThan(C) ) ? ContentCoords.end().pos() : C.pos();
}
int TDEBufferLayout::firstPos( int Line ) const
{
return Line == ContentCoords.start().line() ? ContentCoords.start().pos() : 0;
}
int TDEBufferLayout::lastPos( int Line ) const
{
return ( Line == ContentCoords.end().line() ) ? ContentCoords.end().pos() : NoOfBytesPerLine-1;
}
bool TDEBufferLayout::hasContent( int Line ) const
{
return ContentCoords.includesLine( Line );
}
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