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
|
/***************************************************************************
dsrichtext.h - description
-------------------
begin : Fre Okt 17 2003
copyright : (C) 2003 by Dominik Seichter
email : domseichter@web.de
***************************************************************************/
/***************************************************************************
* *
* 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 DSRICHTEXT_H
#define DSRICHTEXT_H
#define QT_TEXT_BUG
/*#undef QT_TEXT_BUG*/
#ifdef QT_TEXT_BUG
#include <qcolor.h>
#include <qfont.h>
#include <qstring.h>
#include <qvaluelist.h>
class DSRichText;
/** This class represents one word,
* formated with a font, a color and an
* alignment.
*/
struct formated_word {
QString text;
QFont font;
QColor color;
int alignment;
bool line;
};
typedef QValueList<formated_word> WordList;
/** This structure represents a single line.
* Every line contains a list of formated_words.
* Wordwrapping has been applied before the line
* was created.
* lineSpacing, ascent and leading come from the
* biggest font in the line.
*/
struct formated_line {
int width;
int lineSpacing;
int ascent;
int leading;
bool line;
WordList formats;
};
typedef QValueList<formated_line> LineList;
class QColor;
class QPainter;
/** A richtext rendering class, which draws a piece
* of HTML formated richtext on any QPainter.
* This class works with all printer resolutions compared
* to the buggy QSimpleRichText
*
* rendering the richtext happens in 3 steps:
* <ul>
* <li> the HTML data is parsed into text_format structures. Each
* of these text_format structures may represend multiple lines, but
* also single words. This depends on how long a formated text is.
* this step happens in the constructor and in parseParagraph()</li>
* <li> the text_format structures are parsed into line structures.
* In this step the wordwrapping is calculated. Each line structure
* has again text_format structures. This is necessary because a line
* of text may of course contain different formattings. A line struct is always
* a single line of drawn text, not more and not less.
* happens in draw() and fillLines()</li>
* <li> the line structure is drawn line by line using QPainter.
* happens in draw()</li>
* </ul>
*
* Printing to the screen is easy and the usage does not differ from
* QSimpleRichText. Drawing on QPrinter is a little bit more complicated.
* The most important thing is that you may not use QPainter::scale().
* A small example on how to print on a QPrinter:
* <pre>
* QPrinter printer( QPrinter::HighResolution );
* QPainter painter( &printer );
* QPaintDeviceMetrics metrics( &printer );
* double scalex = (double)metrics.logicalDpiX() / (double)QPaintDevice::x11AppDpiX();
* double scaley = (double)metrics.logicalDpiY() / (double)QPaintDevice::x11AppDpiY();
*
* DSRichText dsr( "<html><p>Hallo World</p></html>" );
* dsr.setWidth( 200 ); // in screenresolution coordinates
* dsr.setHeight( 80 ); // in screenresolution coordinates
* painter.translate( 10 * scalex, 10 * scaley ); // draw at 10, 10 instead of 0, 0
* dsr.scale( scalex, scaley );
* dsr.draw( &painter );
* </pre>
*
*@author Dominik Seichter
*/
class DSRichText {
public:
/** construct a DSRichText object. @p t is formated text as produces by QTextEdit.
*/
DSRichText( const QString & t );
~DSRichText();
void setX( int x );
void setY( int y );
/** draw the formated text on the QPainter* @p p
*/
void draw( QPainter* p );
/** set the width of the clipping rectangle
*/
void setWidth( int width );
/** set the height of the clipping rectangle
*/
void setHeight( int height );
/** scale everything. This is necessary to print on devices
* with another resolution than the screen. QPainter::scale() won't work.
*/
void setScale( double x, double y ) {
sx = x; sy = y;
};
private:
/** parse a single pare of <p></p> elements
*/
bool parseParagraph();
/** remove <p> and </p> from the QString @p t and return it.
* This function is also responsible for getting the
* correct alignment of the paragraph.
*/
QString parseParagraphTag( const QString & t, int* alignment );
/** parse the align attribute of a <p> tag and return the corresponding Qt alignment value.
*/
int parseAlignment( const QString & align );
/** parse the css style attribute of a <span> tag and return a matching QFont for these
* style. The font color is saved in the QColor* @p color.
*/
QFont parseStyle( const QString & s, QColor* color );
QString parse( const QString & t, const QString & find, const QString & end, int start );
void parseWords( const QString & t, formated_word* w, WordList* words );
void initFormat( formated_word* f, int alignment );
void initLine( QValueList<formated_line>* l );
void updateSpacing( QValueList<formated_line>* l, QFontMetrics* fm );
/** draw the line @p line justified as blockquote
*/
void drawJustified( formated_line* line );
/** calculate the y-deviation needed, because of different font sizes in this line
*/
inline int yDeviation( const formated_line* line );
/** replace HTML escape sequences such as < to their real character meaning (i.e. < )
*/
QString replaceEscapeSequences( const QString & t );
/** fill the line structures with data
*/
void fillLines();
int pos; // current position in text
int start; // start of a tag
int end; // end of a tag
int x; // x position
int y; // y position
int w; // width of the text element
int h; // height of the text element
int xpos; // x position at the beginning
int ypos; // y position at the beginning
double sx;
double sy;
QString text;
QFont m_base;
QColor m_color;
QPainter* painter;
QValueList<LineList> line_p;
QValueList<WordList> word_p;
};
#endif // QT_TEXT_BUG
#endif
|
