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
|
/****************************************************************************
**
** ???
**
** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the kernel module of the Qt GUI Toolkit.
**
** This file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the files LICENSE.GPL2
** and LICENSE.GPL3 included in the packaging of this file.
** Alternatively you may (at your option) use any later version
** of the GNU General Public License if such license has been
** publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free Qt Foundation.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with
** the Software.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/
#ifndef QTEXTLAYOUT_P_H
#define QTEXTLAYOUT_P_H
#ifndef QT_H
#include "qstring.h"
#include "qnamespace.h"
#include "qrect.h"
#endif // QT_H
class QTextEngine;
class QFont;
class Q_EXPORT QTextItem
{
public:
inline QTextItem() : item(0), engine(0) {}
inline bool isValid() const { return (bool)engine; }
QRect rect() const;
int x() const;
int y() const;
int width() const;
int ascent() const;
int descent() const;
enum Edge {
Leading,
Trailing
};
enum CursorPosition {
BetweenCharacters,
OnCharacters
};
/* cPos gets set to the valid position */
int cursorToX( int *cPos, Edge edge = Leading ) const;
inline int cursorToX( int cPos, Edge edge = Leading ) const { return cursorToX( &cPos, edge ); }
int xToCursor( int x, CursorPosition = BetweenCharacters ) const;
bool isRightToLeft() const;
bool isObject() const;
bool isSpace() const;
bool isTab() const;
void setWidth( int w );
void setAscent( int a );
void setDescent( int d );
int from() const;
int length() const;
private:
friend class QTextLayout;
friend class QPainter;
friend class QPSPrinter;
QTextItem( int i, QTextEngine *e ) : item( i ), engine( e ) {}
int item;
QTextEngine *engine;
};
class QPainter;
class Q_EXPORT QTextLayout
{
public:
// does itemization
QTextLayout();
QTextLayout( const QString& string, QPainter * = 0 );
QTextLayout( const QString& string, const QFont& fnt );
~QTextLayout();
void setText( const QString& string, const QFont& fnt );
enum LineBreakStrategy {
AtWordBoundaries,
AtCharBoundaries
};
/* add an additional item boundary eg. for style change */
void setBoundary( int strPos );
int numItems() const;
QTextItem itemAt( int i ) const;
QTextItem findItem( int strPos ) const;
enum LayoutMode {
NoBidi,
SingleLine,
MultiLine
};
void beginLayout( LayoutMode m = MultiLine );
void beginLine( int width );
bool atEnd() const;
QTextItem nextItem();
QTextItem currentItem();
/* ## maybe also currentItem() */
void setLineWidth( int newWidth );
int lineWidth() const;
int widthUsed() const;
int availableWidth() const;
enum Result {
Ok,
LineFull,
LineEmpty,
Error
};
/* returns true if completely added */
Result addCurrentItem();
/* Note: if ascent and descent are used they must be initialized to the minimum ascent/descent
acceptable for the line. QFontMetrics::ascent/descent() is usually the right choice */
Result endLine( int x = 0, int y = 0, int alignment = Qt::AlignLeft,
int *ascent = 0, int *descent = 0, int *left = 0, int *right = 0 );
void endLayout();
enum CursorMode {
SkipCharacters,
SkipWords
};
bool validCursorPosition( int pos ) const;
int nextCursorPosition( int oldPos, CursorMode mode = SkipCharacters ) const;
int previousCursorPosition( int oldPos, CursorMode mode = SkipCharacters ) const;
void setDirection(QChar::Direction);
private:
QTextLayout( QTextEngine *e ) : d( e ) {}
/* disable copy and assignment */
QTextLayout( const QTextLayout & ) {}
void operator = ( const QTextLayout & ) {}
friend class QTextItem;
friend class QPainter;
friend class QPSPrinter;
QTextEngine *d;
};
/*
class QPainter {
.....
void drawTextItem( int x, int y, QTextItem *item );
};
*/
#endif
|
