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/***************************************************************************
kbuffersection.h - description
-------------------
begin : 22.06.2003
copyright : (C) 2003 by Friedrich W. H. Kossebau
email : Friedrich.W.H@Kossebau.de
****************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#ifndef KHE_KSELECTION_H
#define KHE_KSELECTION_H
#include "ksection.h"
namespace KHE
{
/** This class describes a selected section of the buffer.
* As it is used as selection controlled by
* mouse and keyboard commands it offers two ways to set its range:
* - by giving the startposition (of the cursor) of an interactive selection
* and the subsequent end positions (until selection is finished)
* - direct setting (as provided by KSection)
*
* the interactive selection takes care that
*
*@author Friedrich W. H. Kossebau
*/
class KSelection : public KSection
{
public:
/** creates a selection with a given start.
* @param Index index in front of which the selection begins
*/
KSelection( int Index );
/** creates an invalid selection */
KSelection();
~KSelection();
public:
KSelection &operator=( const KSelection &S );
KSelection &operator=( const KSection &S );
public: // modification access
/** starts the selection.
* For this the anchor, start and end are set to the given index,
* so the initial selection is empty.
* @param Index index in front of which the selection begins
*/
void setStart( int Index );
/** sets the end of the current selection
* If the end is before the start the selection will reach from the given index
* @param Index index in front of which the selection ends
*/
void setEnd( int Index );
/** sets the selection to be invalid
*/
void cancel();
/** sets the anchor to the start
* If the selection has not started the behaviour is undefined.
*/
void setForward();
/** sets the anchor to the end
* If the selection has not started the behaviour is undefined.
*/
void setBackward();
/** swaps anchor from start to end or vice versa
* If the selection has not started the behaviour is undefined.
*/
void reverse();
public: // value access
/**
* @return anchor value
*/
int anchor() const;
public: // logic access
/**
* @return @c true if the anchor has been set, otherwise @c false.
*/
bool started() const;
/**
* @return @c true if the anchor has been set and the selection is empty, otherwise @c false.
*/
bool justStarted() const;
/**
* @return @c true if the anchor is at the begin of the selection
*/
bool isForward() const;
protected:
/** cursor index where the selection starts */
int Anchor;
};
inline KSelection::KSelection() : Anchor( -1 ) {}
inline KSelection::KSelection( int Index ) : Anchor( Index ) {}
inline KSelection::~KSelection() {}
inline KSelection &KSelection::operator=( const KSelection &S )
{
KSection::operator=(S);
Anchor = S.Anchor;
return *this;
}
inline KSelection &KSelection::operator=( const KSection &S )
{
KSection::operator=(S);
Anchor = start();
return *this;
}
inline void KSelection::setStart( int Index )
{
Anchor = Index;
unset();
}
inline void KSelection::setEnd( int Index )
{
// nothing selected?
if( Index == Anchor )
unset();
// selecting forwards?
else if( Index > Anchor )
{
KSection::setStart( Anchor );
KSection::setEnd( Index-1 );
}
// selecting backwards
else
{
KSection::setStart( Index );
KSection::setEnd( Anchor-1 );
}
}
inline void KSelection::reverse()
{
Anchor = isForward() ? end()+1 : start();
}
inline void KSelection::setForward()
{
Anchor = start();
}
inline void KSelection::setBackward()
{
Anchor = end()+1;
}
inline int KSelection::anchor() const { return Anchor; }
inline void KSelection::cancel() { Anchor = -1; unset(); }
inline bool KSelection::started() const { return Anchor != -1; }
inline bool KSelection::justStarted() const { return Anchor != -1 && start() == -1; }
inline bool KSelection::isForward() const { return Anchor == start(); }
}
#endif
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