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#ifndef LineNumberDisplay_h
#define LineNumberDisplay_h
/******************************************************************************
*
* Copyright (C) 2002 Hugo PEREIRA <mailto: hugo.pereira@free.fr>
*
* This is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any later
* version.
*
* This software is distributed in the hope that it will be useful, but WITHOUT
* Any WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*
*******************************************************************************/
#include "Counter.h"
#include "Debug.h"
#include <QColor>
#include <QFont>
#include <QMouseEvent>
#include <QPaintEvent>
#include <QTextBlock>
#include <QObject>
#include <QList>
class TextEditor;
//* display line number of a text editor
class LineNumberDisplay: public QObject, private Base::Counter<LineNumberDisplay>
{
//* Qt meta object
Q_OBJECT
public:
//* constructor
explicit LineNumberDisplay(TextEditor*);
//* synchronization
void synchronize( LineNumberDisplay* );
//* width
bool updateWidth( int );
//* width
int width() const
{ return width_; }
//* clear everything
void clear();
//* paint
void paint( QPainter& );
public Q_SLOTS:
//* need update
void needUpdate()
{ needsUpdate_ = true; }
private Q_SLOTS:
//* contents changed
void _contentsChanged();
//* block count changed
void _blockCountChanged();
private:
//* map block number and position
class LineNumberData final
{
public:
//* list of data
using List = QList<LineNumberData>;
//* constructor
explicit LineNumberData( int id = 0, int lineNumber = 0, int cursor = 0):
id_( id ),
lineNumber_( lineNumber ),
cursor_( cursor ),
position_( -1 ),
valid_( false )
{}
//* id
int id() const
{ return id_; }
//* line number
int lineNumber() const
{ return lineNumber_; }
//* y
int cursor() const
{ return cursor_; }
//* position
void setPosition( int position )
{
valid_ = (position >= 0);
position_ = position;
}
//* position
int position() const
{ return position_; }
//* validity
bool isValid() const
{ return valid_; }
private:
//* block id
int id_;
//* line number
int lineNumber_;
//* position
int cursor_;
//* position
int position_;
//* validity
bool valid_;
//* equal to operator
friend bool operator == (const LineNumberData& first, const LineNumberData& second )
{ return first.id() == second.id(); }
};
//* update line number data
void _updateLineNumberData();
//* update invalid data
void _updateLineNumberData( QTextBlock&, int&, LineNumberData& ) const;
//* associated editor
TextEditor* editor_ = nullptr;
//* true when line number data update is needed
bool needsUpdate_ = true;
//* width
int width_ = 0;
//* line number data
LineNumberData::List lineNumberData_;
//* current block data
LineNumberData currentBlockData_;
};
#endif
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