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