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/* This file is part of the KDE libraries
Copyright (C) 2001 David Faure <david@mandrakesoft.com>
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.
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.
*/
#ifndef kwordwrap_h
#define kwordwrap_h
#include <qfontmetrics.h>
#include <qvaluelist.h>
#include <qrect.h>
#include <qstring.h>
#include <kdelibs_export.h>
/**
* Word-wrap algorithm that takes into account beautifulness ;)
*
* That means:
* @li not letting a letter alone on the last line,
* @li breaking at punctuation signs (not only at spaces)
* @li improved handling of (), [] and {}
* @li improved handling of '/' (e.g. for paths)
*
* Usage: call the static method, formatText, with the text to
* wrap and the constraining rectangle etc., it will return an instance of KWordWrap
* containing internal data, result of the word-wrapping.
* From that instance you can retrieve the boundingRect, and invoke drawing.
*
* This design allows to call the word-wrap algorithm only when the text changes
* and not every time we want to know the bounding rect or draw the text.
*
* @author David Faure <faure@kde.org>
*/
class KDEUI_EXPORT KWordWrap
{
public:
/**
* Use this flag in drawText() if you want to fade out the text if it does
* not fit into the constraining rectangle.
* @since 3.2
*/
enum { FadeOut = 0x10000000, Truncate = 0x20000000 };
/**
* Main method for wrapping text.
*
* @param fm Font metrics, for the chosen font. Better cache it, creating a QFontMetrics is expensive.
* @param r Constraining rectangle. Only the width and height matter. With
* negative height the complete text will be rendered
* @param flags currently unused
* @param str The text to be wrapped.
* @param len Length of text to wrap (default is -1 for all).
* @return a KWordWrap instance. The caller is responsible for storing and deleting the result.
*/
static KWordWrap* formatText( QFontMetrics &fm, const QRect & r, int flags, const QString & str, int len = -1 );
/**
* @return the bounding rect, calculated by formatText. The width is the
* width of the widest text line, and never wider than
* the rectangle given to formatText. The height is the
* text block. X and Y are always 0.
*/
QRect boundingRect() const { return m_boundingRect; }
/**
* @return the original string, with '\n' inserted where
* the text is broken by the wordwrap algorithm.
*/
QString wrappedString() const; // gift for Dirk :)
/**
* @return the original string, truncated to the first line.
* If @p dots was set, '...' is appended in case the string was truncated.
* Bug: Note that the '...' come out of the bounding rect.
*/
QString truncatedString( bool dots = true ) const;
/**
* Draw the text that has been previously wrapped, at position x,y.
* Flags are for alignment, e.g. Qt::AlignHCenter. Default is
* Qt::AlignAuto.
* @param painter the QPainter to use.
* @param x the horizontal position of the text
* @param y the vertical position of the text
* @param flags the ORed text alignment flags from the Qt namespace,
* ORed with FadeOut if you want the text to fade out if it
* does not fit (the @p painter's background must be set
* accordingly)
*/
void drawText( QPainter *painter, int x, int y, int flags = Qt::AlignAuto ) const;
/**
* Destructor.
*/
~KWordWrap();
/**
* Draws the string @p t at the given coordinates, if it does not
* @p fit into @p maxW the text will be faded out.
* @param p the painter to use. Must have set the pen for the text
* color and the background for the color to fade out
* @param x the horizontal position of the text
* @param y the vertical position of the text
* @param maxW the maximum width of the text (including the fade-out
* effect)
* @param t the text to draw
* @since 3.2
*/
static void drawFadeoutText( QPainter *p, int x, int y, int maxW,
const QString &t );
/**
* Draws the string @p t at the given coordinates, if it does not
* @p fit into @p maxW the text will be truncated.
* @param p the painter to use
* @param x the horizontal position of the text
* @param y the vertical position of the text
* @param maxW the maximum width of the text (including the '...')
* @param t the text to draw
* @since 3.3
*/
static void drawTruncateText( QPainter *p, int x, int y, int maxW,
const QString &t );
private:
KWordWrap( const QRect & r );
QValueList<int> m_breakPositions;
QValueList<int> m_lineWidths;
QRect m_boundingRect;
QString m_text;
private:
class KWordWrapPrivate* d;
};
#endif
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