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/***************************************************************************
kbuffercursor.cpp - description
-------------------
begin : Don Mai 29 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 <kdebug.h>
// lib specific
#include "kbufferlayout.h"
#include "kbuffercursor.h"
using namespace KHE;
KBufferCursor::KBufferCursor( const KBufferLayout *L )
: Layout( L ),
Index( 0 ),
Coord( 0, 0 ),
Behind( false ),
AppendPosEnabled( false )
{
}
KBufferCursor::~KBufferCursor()
{
}
bool KBufferCursor::operator==( const KBufferCursor &C ) const
{
return Index == C.Index && Behind == C.Behind ;
}
void KBufferCursor::setAppendPosEnabled( bool APE )
{
if( AppendPosEnabled == APE )
return;
AppendPosEnabled = APE;
// reposition Cursor
int Length = Layout->length();
// behind buffer end, not end of line and not empty?
if( realIndex() >= Length && Coord.pos() < Layout->noOfBytesPerLine()-1 && Length > 0 )
{
if( AppendPosEnabled )
{
++Index;
Coord.goRight();
Behind = false;
}
else
{
--Index;
Coord.goLeft();
Behind = true;
}
}
}
void KBufferCursor::gotoPreviousByte()
{
if( Behind )
Behind = false;
else if( Index > 0 )
{
--Index;
Coord.goCLeft( Layout->noOfBytesPerLine()-1 );
}
}
void KBufferCursor::gotoPreviousByte( int D )
{
if( Behind )
{
--D;
Behind = false;
}
if( D > Index )
{
if( Index == 0 )
return;
gotoStart();
}
gotoIndex( Index - D );
}
void KBufferCursor::gotoNextByte()
{
int Length = Layout->length();
if( Index < Length )
{
if( Index == Length-1 )
stepToEnd();
else
{
++Index;
Coord.goCRight( Layout->noOfBytesPerLine()-1 );
Behind = false;
}
}
}
void KBufferCursor::gotoNextByte( int D ) // TODO: think about consistency with gotoNextByte!!!
{
if( Behind )
{
++D;
Behind = false;
}
// would we end behind the end?
if( Index+D >= Layout->length() )
gotoEnd();
else
gotoIndex( Index + D );
}
void KBufferCursor::gotoNextByteInLine()
{
int Length = Layout->length();
if( Index < Length )
{
if( Index == Length-1 )
stepToEnd();
else
{
++Index;
if( Coord.pos() < Layout->noOfBytesPerLine()-1 )
Coord.goRight();
else
Behind = true;
}
}
}
void KBufferCursor::gotoUp()
{
// can we even go up?
if( Coord.isBelow(Layout->startLine()) )
{
Coord.goUp();
if( Coord.isPriorInLineThan(Layout->start()) )
{
Index = 0;
Coord.setPos( Layout->startPos() );
Behind = false;
}
else
{
Index -= Layout->noOfBytesPerLine();
if( Behind && !atLineEnd() )
{
++Index;
Coord.goRight();
Behind = false;
}
}
}
}
void KBufferCursor::gotoDown()
{
if( Coord.isAbove(Layout->finalLine()) )
{
Coord.goDown();
// behind End?
if( Coord.isLaterInLineThan(Layout->final()) )
gotoEnd();
else
Index += Layout->noOfBytesPerLine();
}
}
void KBufferCursor::gotoLineStart()
{
int OldIndex = Index;
Index = Layout->indexAtLineStart( Coord.line() );
Coord.goLeft( OldIndex-Index );
Behind = false;
}
void KBufferCursor::gotoLineEnd()
{
if( Index < Layout->length() )
{
int OldIndex = Index;
Index = Layout->indexAtLineEnd( Coord.line() );
Coord.goRight( Index-OldIndex );
stepToEnd();
}
}
void KBufferCursor::gotoStart()
{
Index = 0;
Coord = Layout->start();
Behind = false;
}
void KBufferCursor::gotoEnd()
{
int Length = Layout->length();
if( Length > 0 )
{
Index = Length-1;
Coord = Layout->final();
stepToEnd();
}
else
gotoStart();
}
void KBufferCursor::gotoCIndex( int i )
{
if( Layout->length() > 0 )
{
Index = Layout->correctIndex( i );
Coord = Layout->coordOfIndex( Index );
if( i > Index )
stepToEnd();
else
Behind = false;
}
else
gotoStart();
}
void KBufferCursor::gotoCCoord( const KBufferCoord &C )
{
if( Layout->length() > 0 )
{
Coord = Layout->correctCoord( C );
Index = Layout->indexAtCoord( Coord );
if( C > Coord )
stepToEnd();
else
Behind = false;
}
else
gotoStart();
}
void KBufferCursor::stepToEnd()
{
if( AppendPosEnabled && (Coord.pos() < Layout->noOfBytesPerLine()-1) )
{
++Index;
Coord.goRight();
Behind = false;
}
else
Behind = true;
}
void KBufferCursor::gotoIndex( int i )
{
Index = i;
Coord = Layout->coordOfIndex( Index );
Behind = false;
}
void KBufferCursor::gotoRealIndex()
{
if( Behind )
{
++Index;
Coord = Layout->coordOfIndex( Index );
Behind = false;
}
}
void KBufferCursor::gotoCoord( const KBufferCoord &C )
{
Index = Layout->indexAtCoord( C );
Coord = C;
Behind = false;
}
void KBufferCursor::updateCoord()
{
Coord = Layout->coordOfIndex( Index );
}
// page down should be: one page minus one line
// -> if in the very first line page down will put the cursor on the same page into the last line
void KBufferCursor::gotoPageUp()
{
int NoOfLinesPerPage = Layout->noOfLinesPerPage();
int NewIndex = Index - NoOfLinesPerPage * Layout->noOfBytesPerLine();
if( NewIndex < 0 )
gotoStart();
else
{
Index = NewIndex;
Coord.goUp( NoOfLinesPerPage );
if( Behind && !atLineEnd() )
{
++Index;
Coord.goRight();
Behind = false;
}
}
}
void KBufferCursor::gotoPageDown()
{
int NoOfLinesPerPage = Layout->noOfLinesPerPage();
int NewIndex = Index + NoOfLinesPerPage * Layout->noOfBytesPerLine();
if( NewIndex >= Layout->length() )
gotoEnd();
else
{
Index = NewIndex;
Coord.goDown( NoOfLinesPerPage );
}
}
int KBufferCursor::validIndex() const { return Index < Layout->length() ? Index : -1; }
int KBufferCursor::indexAtLineStart() const { return Layout->indexAtLineStart( Coord.line() ); }
int KBufferCursor::indexAtLineEnd() const { return Layout->indexAtLineEnd( Coord.line() ); }
bool KBufferCursor::atStart() const { return Index == 0; }
bool KBufferCursor::atEnd() const { return Index == Layout->length() - 1; }
bool KBufferCursor::atAppendPos() const { return realIndex() >= Layout->length(); }
bool KBufferCursor::atLineStart() const { return Layout->atLineStart( Coord ); }
bool KBufferCursor::atLineEnd() const { return Layout->atLineEnd( Coord ); }
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