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00019 #include "kwordwrap.h"
00020 #include <kdebug.h>
00021 #include <qpainter.h>
00022
00023 class KWordWrapPrivate {
00024 public:
00025 QRect m_constrainingRect;
00026 };
00027
00028 KWordWrap::KWordWrap(const QRect & r) {
00029 d = new KWordWrapPrivate;
00030 d->m_constrainingRect = r;
00031 }
00032
00033 KWordWrap* KWordWrap::formatText( QFontMetrics &fm, const QRect & r, int , const QString & str, int len )
00034 {
00035 KWordWrap* kw = new KWordWrap( r );
00036
00037
00038
00039
00040 int height = fm.height();
00041 if ( len == -1 )
00042 kw->m_text = str;
00043 else
00044 kw->m_text = str.left( len );
00045 if ( len == -1 )
00046 len = str.length();
00047 int lastBreak = -1;
00048 int lineWidth = 0;
00049 int x = 0;
00050 int y = 0;
00051 int w = r.width();
00052 int textwidth = 0;
00053 bool isBreakable = false;
00054 bool wasBreakable = false;
00055 bool isParens = false;
00056 bool wasParens = false;
00057
00058 for ( int i = 0 ; i < len; ++i )
00059 {
00060 QChar c = str[i];
00061 int ww = fm.charWidth( str, i );
00062
00063 isParens = ( c == '(' || c == '[' || c == '{' );
00064
00065 isBreakable = ( c.isSpace() || c.isPunct() || c.isSymbol() ) & !isParens;
00066
00067
00068 if ( !isBreakable && i < len-1 ) {
00069 QChar nextc = str[i+1];
00070 isBreakable = ( nextc == '(' || nextc == '[' || nextc == '{' );
00071 }
00072
00073
00074
00075 if ( c == '/' && (wasBreakable || wasParens) )
00076 isBreakable = false;
00077
00078
00079
00080
00081 int breakAt = -1;
00082 if ( x + ww > w && lastBreak != -1 )
00083 breakAt = lastBreak;
00084 if ( x + ww > w - 4 && lastBreak == -1 )
00085 breakAt = i;
00086 if ( i == len - 2 && x + ww + fm.charWidth( str, i+1 ) > w )
00087 breakAt = lastBreak == -1 ? i - 1 : lastBreak;
00088 if ( c == '\n' )
00089 {
00090 if ( breakAt == -1 && lastBreak != -1)
00091 {
00092 breakAt = i - 1;
00093 lastBreak = -1;
00094 }
00095
00096 kw->m_text.remove(i, 1);
00097 len--;
00098 }
00099 if ( breakAt != -1 )
00100 {
00101
00102 kw->m_breakPositions.append( breakAt );
00103 int thisLineWidth = lastBreak == -1 ? x + ww : lineWidth;
00104 kw->m_lineWidths.append( thisLineWidth );
00105 textwidth = QMAX( textwidth, thisLineWidth );
00106 x = 0;
00107 y += height;
00108 wasBreakable = true;
00109 wasParens = false;
00110 if ( lastBreak != -1 )
00111 {
00112
00113 i = lastBreak;
00114 lastBreak = -1;
00115 continue;
00116 }
00117 } else if ( isBreakable )
00118 {
00119 lastBreak = i;
00120 lineWidth = x + ww;
00121 }
00122 x += ww;
00123 wasBreakable = isBreakable;
00124 wasParens = isParens;
00125 }
00126 textwidth = QMAX( textwidth, x );
00127 kw->m_lineWidths.append( x );
00128 y += height;
00129
00130 kw->m_boundingRect.setRect( 0, 0, textwidth, y );
00131 return kw;
00132 }
00133
00134 KWordWrap::~KWordWrap() {
00135 delete d;
00136 }
00137
00138 QString KWordWrap::wrappedString() const
00139 {
00140
00141 QString ws;
00142 int start = 0;
00143 QValueList<int>::ConstIterator it = m_breakPositions.begin();
00144 for ( ; it != m_breakPositions.end() ; ++it )
00145 {
00146 int end = (*it);
00147 ws += m_text.mid( start, end - start + 1 ) + '\n';
00148 start = end + 1;
00149 }
00150 ws += m_text.mid( start );
00151 return ws;
00152 }
00153
00154 QString KWordWrap::truncatedString( bool dots ) const
00155 {
00156 QString ts;
00157 QValueList<int>::ConstIterator it = m_breakPositions.begin();
00158 if ( it != m_breakPositions.end() )
00159 {
00160 ts = m_text.left( (*it) + 1 );
00161 if ( dots )
00162 ts += "...";
00163 }
00164 else
00165 ts = m_text;
00166 return ts;
00167 }
00168
00169 static QColor mixColors(double p1, QColor c1, QColor c2) {
00170 return QColor(int(c1.red() * p1 + c2.red() * (1.0-p1)),
00171 int(c1.green() * p1 + c2.green() * (1.0-p1)),
00172 int(c1.blue() * p1 + c2.blue() * (1.0-p1)));
00173 }
00174
00175 void KWordWrap::drawFadeoutText(QPainter *p, int x, int y, int maxW,
00176 const QString &t) {
00177 QFontMetrics fm = p->fontMetrics();
00178 QColor bgColor = p->backgroundColor();
00179 QColor textColor = p->pen().color();
00180
00181 if ( ( fm.boundingRect( t ).width() > maxW ) && ( t.length() > 1 ) ) {
00182 unsigned int tl = 0;
00183 int w = 0;
00184 while ( tl < t.length() ) {
00185 w += fm.charWidth( t, tl );
00186 if ( w >= maxW )
00187 break;
00188 tl++;
00189 }
00190
00191 if (tl > 3) {
00192 p->drawText( x, y, t.left( tl - 3 ) );
00193 x += fm.width( t.left( tl - 3 ) );
00194 }
00195 int n = QMIN( tl, 3);
00196 for (int i = 0; i < n; i++) {
00197 p->setPen( mixColors( 0.70 - i * 0.25, textColor, bgColor ) );
00198 QString s( t.at( tl - n + i ) );
00199 p->drawText( x, y, s );
00200 x += fm.width( s );
00201 }
00202 }
00203 else
00204 p->drawText( x, y, t );
00205 }
00206
00207 void KWordWrap::drawText( QPainter *painter, int textX, int textY, int flags ) const
00208 {
00209
00210
00211 int start = 0;
00212 int y = 0;
00213 QFontMetrics fm = painter->fontMetrics();
00214 int height = fm.height();
00215 int ascent = fm.ascent();
00216 int maxwidth = m_boundingRect.width();
00217 QValueList<int>::ConstIterator it = m_breakPositions.begin();
00218 QValueList<int>::ConstIterator itw = m_lineWidths.begin();
00219 for ( ; it != m_breakPositions.end() ; ++it, ++itw )
00220 {
00221
00222 if ( (d->m_constrainingRect.height() >= 0) &&
00223 ((y + 2 * height) > d->m_constrainingRect.height()) )
00224 break;
00225 int end = (*it);
00226 int x = textX;
00227 if ( flags & Qt::AlignHCenter )
00228 x += ( maxwidth - *itw ) / 2;
00229 else if ( flags & Qt::AlignRight )
00230 x += maxwidth - *itw;
00231 painter->drawText( x, textY + y + ascent, m_text.mid( start, end - start + 1 ) );
00232 y += height;
00233 start = end + 1;
00234 }
00235
00236 int x = textX;
00237 if ( flags & Qt::AlignHCenter )
00238 x += ( maxwidth - *itw ) / 2;
00239 else if ( flags & Qt::AlignRight )
00240 x += maxwidth - *itw;
00241 if ( (d->m_constrainingRect.height() < 0) ||
00242 ((y + height) <= d->m_constrainingRect.height()) ) {
00243 if ( it == m_breakPositions.end() )
00244 painter->drawText( x, textY + y + ascent, m_text.mid( start ) );
00245 else if (flags & FadeOut)
00246 drawFadeoutText( painter, x, textY + y + ascent,
00247 d->m_constrainingRect.width() - x + textX,
00248 m_text.mid( start ) );
00249 else
00250 painter->drawText( x, textY + y + ascent,
00251 m_text.mid( start, (*it) - start + 1 ) );
00252 }
00253 }
00254