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authortoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
committertoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
commitce4a32fe52ef09d8f5ff1dd22c001110902b60a2 (patch)
tree5ac38a06f3dde268dc7927dc155896926aaf7012 /kdeui/kwordwrap.h
downloadtdelibs-ce4a32fe52ef09d8f5ff1dd22c001110902b60a2.tar.gz
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Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.
BUG:215923 git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdelibs@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
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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