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-rw-r--r--kdeui/kwordwrap.cpp269
1 files changed, 269 insertions, 0 deletions
diff --git a/kdeui/kwordwrap.cpp b/kdeui/kwordwrap.cpp
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+++ b/kdeui/kwordwrap.cpp
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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.
+*/
+
+#include "kwordwrap.h"
+#include <kdebug.h>
+#include <kstringhandler.h>
+#include <qpainter.h>
+
+class KWordWrapPrivate {
+public:
+ QRect m_constrainingRect;
+};
+
+KWordWrap::KWordWrap(const QRect & r) {
+ d = new KWordWrapPrivate;
+ d->m_constrainingRect = r;
+}
+
+KWordWrap* KWordWrap::formatText( QFontMetrics &fm, const QRect & r, int /*flags*/, const QString & str, int len )
+{
+ KWordWrap* kw = new KWordWrap( r );
+ // The wordwrap algorithm
+ // The variable names and the global shape of the algorithm are inspired
+ // from QTextFormatterBreakWords::format().
+ //kdDebug() << "KWordWrap::formatText " << str << " r=" << r.x() << "," << r.y() << " " << r.width() << "x" << r.height() << endl;
+ int height = fm.height();
+ if ( len == -1 )
+ kw->m_text = str;
+ else
+ kw->m_text = str.left( len );
+ if ( len == -1 )
+ len = str.length();
+ int lastBreak = -1;
+ int lineWidth = 0;
+ int x = 0;
+ int y = 0;
+ int w = r.width();
+ int textwidth = 0;
+ bool isBreakable = false;
+ bool wasBreakable = false; // value of isBreakable for last char (i-1)
+ bool isParens = false; // true if one of ({[
+ bool wasParens = false; // value of isParens for last char (i-1)
+
+ for ( int i = 0 ; i < len; ++i )
+ {
+ QChar c = str[i];
+ int ww = fm.charWidth( str, i );
+
+ isParens = ( c == '(' || c == '[' || c == '{' );
+ // isBreakable is true when we can break _after_ this character.
+ isBreakable = ( c.isSpace() || c.isPunct() || c.isSymbol() ) & !isParens;
+
+ // Special case for '(', '[' and '{': we want to break before them
+ if ( !isBreakable && i < len-1 ) {
+ QChar nextc = str[i+1]; // look at next char
+ isBreakable = ( nextc == '(' || nextc == '[' || nextc == '{' );
+ }
+ // Special case for '/': after normal chars it's breakable (e.g. inside a path),
+ // but after another breakable char it's not (e.g. "mounted at /foo")
+ // Same thing after a parenthesis (e.g. "dfaure [/fool]")
+ if ( c == '/' && (wasBreakable || wasParens) )
+ isBreakable = false;
+
+ /*kdDebug() << "c='" << QString(c) << "' i=" << i << "/" << len
+ << " x=" << x << " ww=" << ww << " w=" << w
+ << " lastBreak=" << lastBreak << " isBreakable=" << isBreakable << endl;*/
+ int breakAt = -1;
+ if ( x + ww > w && lastBreak != -1 ) // time to break and we know where
+ breakAt = lastBreak;
+ if ( x + ww > w - 4 && lastBreak == -1 ) // time to break but found nowhere [-> break here]
+ breakAt = i;
+ if ( i == len - 2 && x + ww + fm.charWidth( str, i+1 ) > w ) // don't leave the last char alone
+ breakAt = lastBreak == -1 ? i - 1 : lastBreak;
+ if ( c == '\n' ) // Forced break here
+ {
+ if ( breakAt == -1 && lastBreak != -1) // only break if not already breaking
+ {
+ breakAt = i - 1;
+ lastBreak = -1;
+ }
+ // remove the line feed from the string
+ kw->m_text.remove(i, 1);
+ len--;
+ }
+ if ( breakAt != -1 )
+ {
+ //kdDebug() << "KWordWrap::formatText breaking after " << breakAt << endl;
+ kw->m_breakPositions.append( breakAt );
+ int thisLineWidth = lastBreak == -1 ? x + ww : lineWidth;
+ kw->m_lineWidths.append( thisLineWidth );
+ textwidth = QMAX( textwidth, thisLineWidth );
+ x = 0;
+ y += height;
+ wasBreakable = true;
+ wasParens = false;
+ if ( lastBreak != -1 )
+ {
+ // Breakable char was found, restart from there
+ i = lastBreak;
+ lastBreak = -1;
+ continue;
+ }
+ } else if ( isBreakable )
+ {
+ lastBreak = i;
+ lineWidth = x + ww;
+ }
+ x += ww;
+ wasBreakable = isBreakable;
+ wasParens = isParens;
+ }
+ textwidth = QMAX( textwidth, x );
+ kw->m_lineWidths.append( x );
+ y += height;
+ //kdDebug() << "KWordWrap::formatText boundingRect:" << r.x() << "," << r.y() << " " << textwidth << "x" << y << endl;
+ if ( r.height() >= 0 && y > r.height() )
+ textwidth = r.width();
+ int realY = y;
+ if ( r.height() >= 0 )
+ {
+ while ( realY > r.height() )
+ realY -= height;
+ realY = QMAX( realY, 0 );
+ }
+ kw->m_boundingRect.setRect( 0, 0, textwidth, realY );
+ return kw;
+}
+
+KWordWrap::~KWordWrap() {
+ delete d;
+}
+
+QString KWordWrap::wrappedString() const
+{
+ // We use the calculated break positions to insert '\n' into the string
+ QString ws;
+ int start = 0;
+ QValueList<int>::ConstIterator it = m_breakPositions.begin();
+ for ( ; it != m_breakPositions.end() ; ++it )
+ {
+ int end = (*it);
+ ws += m_text.mid( start, end - start + 1 ) + '\n';
+ start = end + 1;
+ }
+ ws += m_text.mid( start );
+ return ws;
+}
+
+QString KWordWrap::truncatedString( bool dots ) const
+{
+ if ( m_breakPositions.isEmpty() )
+ return m_text;
+
+ QString ts = m_text.left( m_breakPositions.first() + 1 );
+ if ( dots )
+ ts += "...";
+ return ts;
+}
+
+static QColor mixColors(double p1, QColor c1, QColor c2) {
+ return QColor(int(c1.red() * p1 + c2.red() * (1.0-p1)),
+ int(c1.green() * p1 + c2.green() * (1.0-p1)),
+ int(c1.blue() * p1 + c2.blue() * (1.0-p1)));
+}
+
+void KWordWrap::drawFadeoutText(QPainter *p, int x, int y, int maxW,
+ const QString &t) {
+ QFontMetrics fm = p->fontMetrics();
+ QColor bgColor = p->backgroundColor();
+ QColor textColor = p->pen().color();
+
+ if ( ( fm.boundingRect( t ).width() > maxW ) && ( t.length() > 1 ) ) {
+ unsigned int tl = 0;
+ int w = 0;
+ while ( tl < t.length() ) {
+ w += fm.charWidth( t, tl );
+ if ( w >= maxW )
+ break;
+ tl++;
+ }
+
+ if (tl > 3) {
+ p->drawText( x, y, t.left( tl - 3 ) );
+ x += fm.width( t.left( tl - 3 ) );
+ }
+ int n = QMIN( tl, 3);
+ for (int i = 0; i < n; i++) {
+ p->setPen( mixColors( 0.70 - i * 0.25, textColor, bgColor ) );
+ QString s( t.at( tl - n + i ) );
+ p->drawText( x, y, s );
+ x += fm.width( s );
+ }
+ }
+ else
+ p->drawText( x, y, t );
+}
+
+void KWordWrap::drawTruncateText(QPainter *p, int x, int y, int maxW,
+ const QString &t) {
+ QString tmpText = KStringHandler::rPixelSqueeze( t, p->fontMetrics(), maxW );
+ p->drawText( x, y, tmpText, maxW );
+}
+
+void KWordWrap::drawText( QPainter *painter, int textX, int textY, int flags ) const
+{
+ //kdDebug() << "KWordWrap::drawText text=" << wrappedString() << " x=" << textX << " y=" << textY << endl;
+ // We use the calculated break positions to draw the text line by line using QPainter
+ int start = 0;
+ int y = 0;
+ QFontMetrics fm = painter->fontMetrics();
+ int height = fm.height(); // line height
+ int ascent = fm.ascent();
+ int maxwidth = m_boundingRect.width();
+ QValueList<int>::ConstIterator it = m_breakPositions.begin();
+ QValueList<int>::ConstIterator itw = m_lineWidths.begin();
+ for ( ; it != m_breakPositions.end() ; ++it, ++itw )
+ {
+ // if this is the last line, leave the loop
+ if ( (d->m_constrainingRect.height() >= 0) &&
+ ((y + 2 * height) > d->m_constrainingRect.height()) )
+ break;
+ int end = (*it);
+ int x = textX;
+ if ( flags & Qt::AlignHCenter )
+ x += ( maxwidth - *itw ) / 2;
+ else if ( flags & Qt::AlignRight )
+ x += maxwidth - *itw;
+ painter->drawText( x, textY + y + ascent, m_text.mid( start, end - start + 1 ) );
+ y += height;
+ start = end + 1;
+ }
+ // Draw the last line
+ int x = textX;
+ if ( flags & Qt::AlignHCenter )
+ x += ( maxwidth - *itw ) / 2;
+ else if ( flags & Qt::AlignRight )
+ x += maxwidth - *itw;
+ if ( (d->m_constrainingRect.height() < 0) ||
+ ((y + height) <= d->m_constrainingRect.height()) ) {
+ if ( it == m_breakPositions.end() )
+ painter->drawText( x, textY + y + ascent, m_text.mid( start ) );
+ else if (flags & FadeOut)
+ drawFadeoutText( painter, textX, textY + y + ascent,
+ d->m_constrainingRect.width(),
+ m_text.mid( start ) );
+ else if (flags & Truncate)
+ drawTruncateText( painter, textX, textY + y + ascent,
+ d->m_constrainingRect.width(),
+ m_text.mid( start ) );
+ else
+ painter->drawText( x, textY + y + ascent,
+ m_text.mid( start, (*it) - start + 1 ) );
+ }
+}
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