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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
-