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Diffstat (limited to 'khexedit/lib/tdeselection.h')
| -rw-r--r-- | khexedit/lib/tdeselection.h | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/khexedit/lib/tdeselection.h b/khexedit/lib/tdeselection.h new file mode 100644 index 0000000..7e69d9b --- /dev/null +++ b/khexedit/lib/tdeselection.h @@ -0,0 +1,178 @@ +/*************************************************************************** + 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 TDESelection : public KSection +{ + public: + /** creates a selection with a given start. + * @param Index index in front of which the selection begins + */ + TDESelection( int Index ); + /** creates an invalid selection */ + TDESelection(); + ~TDESelection(); + + public: + TDESelection &operator=( const TDESelection &S ); + TDESelection &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 TDESelection::TDESelection() : Anchor( -1 ) {} +inline TDESelection::TDESelection( int Index ) : Anchor( Index ) {} +inline TDESelection::~TDESelection() {} + +inline TDESelection &TDESelection::operator=( const TDESelection &S ) +{ + KSection::operator=(S); + Anchor = S.Anchor; + return *this; +} + +inline TDESelection &TDESelection::operator=( const KSection &S ) +{ + KSection::operator=(S); + Anchor = start(); + return *this; +} + + +inline void TDESelection::setStart( int Index ) +{ + Anchor = Index; + unset(); +} + + +inline void TDESelection::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 TDESelection::reverse() +{ + Anchor = isForward() ? end()+1 : start(); +} + +inline void TDESelection::setForward() +{ + Anchor = start(); +} + +inline void TDESelection::setBackward() +{ + Anchor = end()+1; +} + +inline int TDESelection::anchor() const { return Anchor; } + +inline void TDESelection::cancel() { Anchor = -1; unset(); } + +inline bool TDESelection::started() const { return Anchor != -1; } + +inline bool TDESelection::justStarted() const { return Anchor != -1 && start() == -1; } + +inline bool TDESelection::isForward() const { return Anchor == start(); } + +} + +#endif |