1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
/* This file is part of the KDE project
*
* Copyright (C) 2010 Christoph Cullmann <cullmann@kde.org>
* Copyright (C) 2010 Dominik Haumann <dhaumann kde org>
*
* Based on code of the SmartCursor/Range by:
* Copyright (C) 2003-2005 Hamish Rodda <rodda@kde.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "movingcursor.h"
#include "document.h"
using namespace KTextEditor;
MovingCursor::MovingCursor ()
{
}
MovingCursor::~MovingCursor ()
{
}
void MovingCursor::setPosition(int line, int column)
{
// just use setPosition
setPosition(Cursor(line, column));
}
void MovingCursor::setLine (int line)
{
// just use setPosition
setPosition (line, column());
}
void MovingCursor::setColumn (int column)
{
// just use setPosition
setPosition (line(), column);
}
bool MovingCursor::atStartOfLine() const {
return isValidTextPosition() && column() == 0;
}
bool MovingCursor::atEndOfLine() const {
return isValidTextPosition() && column() == document()->lineLength(line());
}
bool MovingCursor::atEndOfDocument() const {
return *this == document()->documentEnd();
}
bool MovingCursor::atStartOfDocument() const {
return line() == 0 && column() == 0;
}
bool MovingCursor::gotoNextLine()
{
// only touch valid cursors
const bool ok = isValid() && (line() + 1 < document()->lines());
if (ok) {
setPosition(Cursor(line() + 1, 0));
}
return ok;
}
bool MovingCursor::gotoPreviousLine()
{
// only touch valid cursors
bool ok = (line() > 0) && (column() >= 0);
if (ok) {
setPosition(Cursor(line() - 1, 0));
}
return ok;
}
bool MovingCursor::move(int chars, WrapBehavior wrapBehavior)
{
if (!isValid()) {
return false;
}
Cursor c(toCursor());
// special case: cursor position is not in valid text, then the algo does
// not work for Wrap mode. Hence, catch this special case by setting
// c.column() to the lineLength()
if (chars > 0 && wrapBehavior == Wrap && c.column() > document()->lineLength(c.line())) {
c.setColumn(document()->lineLength(c.line()));
}
while (chars != 0) {
if (chars > 0) {
if (wrapBehavior == Wrap) {
int advance = qMin(document()->lineLength(c.line()) - c.column(), chars);
if (chars > advance) {
if (c.line() + 1 >= document()->lines()) {
return false;
}
c.setPosition(c.line() + 1, 0);
chars -= advance + 1; // +1 because of end-of-line wrap
} else {
c.setColumn(c.column() + chars);
chars = 0;
}
} else { // NoWrap
c.setColumn(c.column() + chars);
chars = 0;
}
} else {
int back = qMin(c.column(), -chars);
if (-chars > back) {
if (c.line() == 0)
return false;
c.setPosition(c.line() - 1, document()->lineLength(c.line() - 1));
chars += back + 1; // +1 because of wrap-around at start-of-line
} else {
c.setColumn(c.column() + chars);
chars = 0;
}
}
}
if (c != *this) {
setPosition(c);
}
return true;
}
// kate: space-indent on; indent-width 2; replace-tabs on;
|
