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
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
/***************************************************************************
kbufferlayout.h - description
-------------------
begin : Thu Jun 12 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_KBUFFERLAYOUT_H
#define KHE_KBUFFERLAYOUT_H
// lib specific
#include "kcoordrange.h"
#include "ksection.h"
namespace KHE {
/**@short the logical layout of a plain buffer view
*
* Given the values for
* * length of the buffer,
* * number of bytes per line,
* * a possible (relative) offset in the display, and
* * the number of lines per page jump
* the following values are calculated:
* * starting line of display,
* * starting position in this line,
* * final line of display,
* * final position in this line, and
* * the total number of lines (is final line +1 or 0)
*
* This layout sees the buffer as a continous stream of byte,
* thus uses each line after the start from the begin to the end.
*
* If the buffer is empty the end coord will be set one pos left to the start coord
* to easen the cursor handling.
*
*@author Friedrich W. H. Kossebau
*/
class TDEBufferLayout
{
public:
TDEBufferLayout( int NoBpL, int SO, int L );
//TDEBufferLayout();
~TDEBufferLayout();
public: // given values
/** */
int startOffset() const;
/** returns number of bytes per line */
int noOfBytesPerLine() const;
/** returns the length of the displayed data (equals Buffer->size()) */
int length() const;
/** returns number of lines per visual page */
int noOfLinesPerPage() const;
public: // calculated values
int startLine() const;
int startPos() const;
/** returns the coord of the start */
TDEBufferCoord start() const;
int finalLine() const;
int finalPos() const;
/** returns the coord of the end */
TDEBufferCoord final() const;
/** tells how much lines this layout needs (incl. blank leading lines due to StartOffset) */
int noOfLines() const;
public: // value calculation service
/** calculates the index of the coord
* If the coord is before the first coord the first index is returned,
* if the coord is behind the last coord the last index is returned
*/
int indexAtCCoord( const TDEBufferCoord &C ) const;
/** calculates the index of the first pos in line.
* If the line is below the first line the first index is returned,
* if the line is above the last line the last index is returned
*/
int indexAtCLineStart( int L ) const;
/** calculates the index of last pos in line
* If the line is below the first line the first index is returned,
* if the line is above the last line the last index is returned
*/
int indexAtCLineEnd( int L ) const;
/** calculates the line in which index is found
* If the index is below the first index the first line is returned,
* if the index is above the last index the last line is returned
*/
int lineAtCIndex( int Index ) const;
/** calculates the coord in which index is found
* If the index is below the first index the first coord is returned,
* if the index is above the last index the last coord is returned
*/
TDEBufferCoord coordOfCIndex( int Index ) const;
/** calculates the index of coord. if coord is invalid the behaviour is undefinded */
int indexAtCoord( const TDEBufferCoord &C ) const;
/** calculates the index of the first pos in line. if line is invalid the behaviour is undefinded */
int indexAtLineStart( int L ) const;
/** calculates the index of last pos in line. if line is invalid the behaviour is undefinded */
int indexAtLineEnd( int L ) const;
/** calculates the line in which index is found. if index is invalid the behaviour is undefinded */
int lineAtIndex( int Index ) const;
/** calculates the coord in which index is found. if index is invalid the behaviour is undefinded */
TDEBufferCoord coordOfIndex( int Index ) const;
/** returns the used positions in line */
KSection positions( int Line ) const;
/** returns the first Pos in line. if line is invalid the behaviour is undefinded */
int firstPos( int Line ) const;
/** returns the last Pos in line. if line is invalid the behaviour is undefinded */
int lastPos( int Line ) const;
/** returns the valid Pos or the first Pos in line. if coord is invalid the behaviour is undefinded */
int firstPos( const TDEBufferCoord &C ) const;
/** returns the valid Pos or the last Pos in line. if coord is invalid the behaviour is undefinded */
int lastPos( const TDEBufferCoord &C ) const;
/** returns true if the line has content */
bool hasContent( int Line ) const;
/** returns true if the coord is the first in it's line. if coord is invalid the behaviour is undefinded */
bool atLineStart( const TDEBufferCoord &C ) const;
/** returns true if the coord is the last in it's line. if coord is invalid the behaviour is undefinded */
bool atLineEnd( const TDEBufferCoord &C ) const;
/** returns the index if valid or the nearest valid index */
int correctIndex( int I ) const;
/** returns the coord if valid or the nearest valid coord */
TDEBufferCoord correctCoord( const TDEBufferCoord &C ) const;
public: // modification access; return true if changes
/** sets StartOffset, returns true if changed */
bool setStartOffset( int SO );
/** sets number of bytes per line, returns true if changed */
bool setNoOfBytesPerLine( int N );
/** sets number of lines per page */
void setNoOfLinesPerPage( int N );
/** sets length of data to display, returns true if changed */
bool setLength( int L );
protected:
/** calculates the start coord by startoffset and number of bytes per line */
void calcStart();
/** calculates the final coord by startoffset, length, and number of bytes per line */
void calcEnd();
protected:
/** how many chars per line */
int NoOfBytesPerLine;
/** starting offset of the displayed data */
int StartOffset;
/** length of the displayed buffer */
int Length;
/** number of lines that are moved by page up/down */
int NoOfLinesPerPage;
protected: // calculated values, buffered
/** coord in which the start offset is (starting with 0) */
// TDEBufferCoord Start;
/** coord in which the last byte is (starting with 0) */
// TDEBufferCoord Final;
/** */
KCoordRange ContentCoords;
};
inline int TDEBufferLayout::startOffset() const { return StartOffset; }
inline int TDEBufferLayout::noOfBytesPerLine() const { return NoOfBytesPerLine; }
inline int TDEBufferLayout::length() const { return Length; }
inline TDEBufferCoord TDEBufferLayout::final() const { return ContentCoords.end(); }
inline TDEBufferCoord TDEBufferLayout::start() const { return ContentCoords.start(); }
inline int TDEBufferLayout::startPos() const { return start().pos(); }
inline int TDEBufferLayout::finalPos() const { return final().pos(); }
inline int TDEBufferLayout::startLine() const { return start().line(); }
inline int TDEBufferLayout::finalLine() const { return final().line(); }
inline int TDEBufferLayout::noOfLinesPerPage() const { return NoOfLinesPerPage; }
inline int TDEBufferLayout::noOfLines() const { return Length==0?0:final().line()+1; }
}
#endif
|
