00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011
00012 #include <qpainter.h>
00013 #include <qpixmap.h>
00014 #include <qimage.h>
00015 #include <qmap.h>
00016 #include <qwidget.h>
00017 #include "qwt_math.h"
00018 #include "qwt_painter.h"
00019 #include "qwt_text_engine.h"
00020
00021 #if QT_VERSION < 0x040000
00022
00023 #include <qsimplerichtext.h>
00024 #include <qstylesheet.h>
00025
00026 class QwtRichTextDocument: public QSimpleRichText
00027 {
00028 public:
00029 QwtRichTextDocument(const QString &text, const QFont &font):
00030 QSimpleRichText(text, font)
00031 {
00032 }
00033 };
00034
00035 #else // QT_VERSION >= 0x040000
00036
00037 #define USE_LABEL 1
00038 #ifdef USE_LABEL
00039 #include <qlabel.h>
00040 #else
00041 #include <qtextobject.h>
00042 #endif
00043 #include <qtextdocument.h>
00044 #include <qabstracttextdocumentlayout.h>
00045
00046 class QwtRichTextDocument: public QTextDocument
00047 {
00048 public:
00049 QwtRichTextDocument(const QString &text, const QFont &font)
00050 {
00051 setUndoRedoEnabled(false);
00052 setDefaultFont(font);
00053 setHtml(text);
00054
00055
00056 (void)documentLayout();
00057 }
00058 };
00059
00060 #endif
00061
00062 class QwtPlainTextEngine::PrivateData
00063 {
00064 public:
00065 int effectiveAscent(const QFont &font) const
00066 {
00067 const QString fontKey = font.key();
00068
00069 QMap<QString, int>::const_iterator it =
00070 d_ascentCache.find(fontKey);
00071 if ( it == d_ascentCache.end() )
00072 {
00073 int ascent = findAscent(font);
00074 it = d_ascentCache.insert(fontKey, ascent);
00075 }
00076
00077 return (*it);
00078 }
00079
00080 private:
00081 int findAscent(const QFont &font) const
00082 {
00083 static const QString dummy("E");
00084 static const QColor white(Qt::white);
00085
00086 const QFontMetrics fm(font);
00087 QPixmap pm(fm.width(dummy), fm.height());
00088 pm.fill(white);
00089
00090 QPainter p(&pm);
00091 p.setFont(font);
00092 p.drawText(0, 0, pm.width(), pm.height(), 0, dummy);
00093 p.end();
00094
00095 #if QT_VERSION < 0x040000
00096 const QImage img = pm.convertToImage();
00097 #else
00098 const QImage img = pm.toImage();
00099 #endif
00100
00101 int row = 0;
00102 for ( row = 0; row < img.height(); row++ )
00103 {
00104 const QRgb *line = (const QRgb *)img.scanLine(row);
00105
00106 const int w = pm.width();
00107 for ( int col = 0; col < w; col++ )
00108 {
00109 if ( line[col] != white.rgb() )
00110 return fm.ascent() - row + 1;
00111 }
00112 }
00113
00114 return fm.ascent();
00115 }
00116
00117 mutable QMap<QString, int> d_ascentCache;
00118 };
00119
00121 QwtTextEngine::QwtTextEngine()
00122 {
00123 }
00124
00126 QwtTextEngine::~QwtTextEngine()
00127 {
00128 }
00129
00131 QwtPlainTextEngine::QwtPlainTextEngine()
00132 {
00133 d_data = new PrivateData;
00134 }
00135
00137 QwtPlainTextEngine::~QwtPlainTextEngine()
00138 {
00139 delete d_data;
00140 }
00141
00152 int QwtPlainTextEngine::heightForWidth(const QFont& font, int flags,
00153 const QString& text, int width) const
00154 {
00155 const QFontMetrics fm(font);
00156 const QRect rect = fm.boundingRect(
00157 0, 0, width, QWIDGETSIZE_MAX, flags, text);
00158
00159 return rect.height();
00160 }
00161
00171 QSize QwtPlainTextEngine::textSize(const QFont &font,
00172 int flags, const QString& text) const
00173 {
00174 const QFontMetrics fm(font);
00175 const QRect rect = fm.boundingRect(
00176 0, 0, QWIDGETSIZE_MAX, QWIDGETSIZE_MAX, flags, text);
00177
00178 return rect.size();
00179 }
00180
00190 void QwtPlainTextEngine::textMargins(const QFont &font, const QString &,
00191 int &left, int &right, int &top, int &bottom) const
00192 {
00193 left = right = top = 0;
00194
00195 const QFontMetrics fm(font);
00196 top = fm.ascent() - d_data->effectiveAscent(font);
00197 bottom = fm.descent() + 1;
00198 }
00199
00210 void QwtPlainTextEngine::draw(QPainter *painter, const QRect &rect,
00211 int flags, const QString& text) const
00212 {
00213 QwtPainter::drawText(painter, rect, flags, text);
00214 }
00215
00220 bool QwtPlainTextEngine::mightRender(const QString &) const
00221 {
00222 return true;
00223 }
00224
00225 #ifndef QT_NO_RICHTEXT
00226
00228 QwtRichTextEngine::QwtRichTextEngine()
00229 {
00230 }
00231
00242 int QwtRichTextEngine::heightForWidth(const QFont& font, int flags,
00243 const QString& text, int width) const
00244 {
00245 QwtRichTextDocument doc(taggedText(text, flags), font);
00246
00247 #if QT_VERSION < 0x040000
00248 doc.setWidth(width);
00249 const int h = doc.height();
00250 #else
00251 doc.setPageSize(QSize(width, QWIDGETSIZE_MAX));
00252 const int h = qRound(doc.documentLayout()->documentSize().height());
00253 #endif
00254 return h;
00255 }
00256
00267 QSize QwtRichTextEngine::textSize(const QFont &font,
00268 int flags, const QString& text) const
00269 {
00270 QwtRichTextDocument doc(taggedText(text, flags), font);
00271
00272 #if QT_VERSION < 0x040000
00273 doc.setWidth(QWIDGETSIZE_MAX);
00274
00275 int w = doc.widthUsed();
00276 int h = doc.height();
00277 #else
00278 #if USE_LABEL
00279
00280
00281
00282
00283
00284
00285
00286
00287 static int off = 0;
00288 static QLabel *label = NULL;
00289 if ( label == NULL )
00290 {
00291 label = new QLabel;
00292 label->hide();
00293
00294 const char *s = "XXXXX";
00295 label->setText(s);
00296 int w1 = label->sizeHint().width();
00297 const QFontMetrics fm(label->font());
00298 int w2 = fm.width(s);
00299 off = w1 - w2;
00300 }
00301 label->setFont(doc.defaultFont());
00302 label->setText(text);
00303
00304 int w = qwtMax(label->sizeHint().width() - off, 0);
00305 doc.setPageSize(QSize(w, QWIDGETSIZE_MAX));
00306
00307 int h = qRound(doc.documentLayout()->documentSize().height());
00308 #else
00309 QTextLayout *layout = doc.begin().layout();
00310 layout->beginLayout();
00311 for(qreal y = 0;;)
00312 {
00313 QTextLine line = layout->createLine();
00314 if (!line.isValid())
00315 break;
00316 line.setPosition(QPointF(0, y));
00317 y += line.height();
00318 }
00319 layout->endLayout();
00320
00321 int w = qRound(layout->maximumWidth());
00322 int h = qRound(layout->boundingRect().height());
00323
00324 h += QFontMetrics(font).descent() + 4;
00325 w += 2 * 4;
00326 #endif
00327 #endif
00328
00329 return QSize(w, h);
00330 }
00331
00340 void QwtRichTextEngine::draw(QPainter *painter, const QRect &rect,
00341 int flags, const QString& text) const
00342 {
00343 QwtRichTextDocument doc(taggedText(text, flags), painter->font());
00344 QwtPainter::drawSimpleRichText(painter, rect, flags, doc);
00345 }
00346
00355 QString QwtRichTextEngine::taggedText(const QString &text, int flags) const
00356 {
00357 QString richText = text;
00358
00359
00360 if (flags & Qt::AlignJustify)
00361 {
00362 richText.prepend(QString::fromLatin1("<div align=\"justify\">"));
00363 richText.append(QString::fromLatin1("</div>"));
00364 }
00365 else if (flags & Qt::AlignRight)
00366 {
00367 richText.prepend(QString::fromLatin1("<div align=\"right\">"));
00368 richText.append(QString::fromLatin1("</div>"));
00369 }
00370 else if (flags & Qt::AlignHCenter)
00371 {
00372 richText.prepend(QString::fromLatin1("<div align=\"center\">"));
00373 richText.append(QString::fromLatin1("</div>"));
00374 }
00375
00376 return richText;
00377 }
00378
00385 bool QwtRichTextEngine::mightRender(const QString &text) const
00386 {
00387 #if QT_VERSION < 0x040000
00388 return QStyleSheet::mightBeRichText(text);
00389 #else
00390 return Qt::mightBeRichText(text);
00391 #endif
00392 }
00393
00402 void QwtRichTextEngine::textMargins(const QFont &, const QString &,
00403 int &left, int &right, int &top, int &bottom) const
00404 {
00405 left = right = top = bottom = 0;
00406 }
00407
00408 #endif // !QT_NO_RICHTEXT