mirror of
https://invent.kde.org/graphics/okular
synced 2024-11-05 18:34:53 +00:00
70 lines
2.8 KiB
C++
70 lines
2.8 KiB
C++
/***************************************************************************
|
|
* Copyright (C) 2005 by Piotr Szymanski <niedakh@gmail.com> *
|
|
* *
|
|
* This program 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. *
|
|
***************************************************************************/
|
|
|
|
#ifndef _OKULAR_MISC_H_
|
|
#define _OKULAR_MISC_H_
|
|
|
|
#include "area.h"
|
|
|
|
namespace Okular {
|
|
|
|
/**
|
|
@short Wrapper around the information needed to generate the selection area
|
|
There are two assumptions inside this class:
|
|
1. the start never changes, one instance of this class is used for one selection,
|
|
therefore the start of the selection will not change, only end and direction of
|
|
the selection will change.
|
|
|
|
By direction we mean the direction in which the end moves in relation to the start,
|
|
forward selection is when end is after the start, backward when its before.
|
|
2. The following changes might appear during selection:
|
|
a. the end moves without changing the direction (it can move up and down but not past the start):
|
|
only itE will be updated
|
|
b. the end moves with changing the direction then itB becomes itE if the previous direction was forward
|
|
or itE becomes itB
|
|
3. Internally it that is related to the start cursor is always at it[0] while it related to end is it[1],
|
|
transition between meanings (itB/itE) is done with dir modifier;
|
|
*/
|
|
class TextSelection
|
|
{
|
|
public:
|
|
TextSelection( const NormalizedPoint & a, const NormalizedPoint & b )
|
|
{
|
|
if (b.y-a.y<0 || (b.y-a.y==0 && b.x-a.x <0))
|
|
direction=1;
|
|
else
|
|
direction=0;
|
|
cur[0]=a,cur[1]=b;
|
|
it[direction%2]=-1,it[(direction+1)%2]=-1;
|
|
};
|
|
void end( const NormalizedPoint & p )
|
|
{
|
|
// changing direction as in 2b , assuming the bool->int conversion is correct
|
|
int dir1=direction;
|
|
direction = (p.y-cur[0].y<0 || (p.y-cur[0].y==0 && p.x-cur[0].x <0));
|
|
if (direction!=dir1)
|
|
kDebug() << "changing direction in selection\n";
|
|
cur[1]=p;
|
|
}
|
|
void itE (int p) { it[(direction+1)%2]=p; }
|
|
void itB (int p) { it[(direction)%2]=p; }
|
|
int dir () { return direction; }
|
|
NormalizedPoint start() const { return cur[direction%2]; }
|
|
NormalizedPoint end() const { return cur[(direction+1)%2]; }
|
|
int itB() {return it[direction%2];}
|
|
int itE() {return it[(direction+1)%2];}
|
|
private:
|
|
int direction;
|
|
int it[2];
|
|
NormalizedPoint cur[2];
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|