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/****************************************************************************
**
** ???
**
** 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 [email protected].
**
** 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
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