Printing a Qstring

[harakiri]

hi,

i've got a problem with a Qstring i want to print. the string is very long an contains a table made with <tr>, <th>, <br> and so on.

Printing it with the following configuration leads to a result, in which only one line exists and ends at the end of the page. The tags like <br> are idnored -simply printed-, too.

void THIS::printQString() {
 
  Q_ASSERT(xLabel->text());
  QPrintDialog dialog(&printer, this);
 
  if (dialog.exec()) {
    QPainter painter(&printer);
    QFont font("Courier", 8 );
    painter.setPen( Qt::black );
    painter.setFont(font);
 
    painter.drawText(10, 10,xLabel->text());
  }
 
}

void THIS::printQString() {

  Q_ASSERT(xLabel->text());
  QPrintDialog dialog(&printer, this);

  if (dialog.exec()) {
    QPainter painter(&printer);
    QFont font("Courier", 8 );
    painter.setPen( Qt::black );
    painter.setFont(font);

    painter.drawText(10, 10,xLabel->text());
  }

}

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xLabel->setText(COMPLEXTEXT); does exactely what i want but painter.drawText(10, 10,xLabel->text()); doesn't format the QString in the same way. I want the printing result look exactely the same way as the QLabel xLabel (it fits on a page for sure).

How can this be done?

[marcel]

Grab the label into a pixmap and print the damn thing .
Of course QPainter won't do anything to the text. It doesn't know HTML.

Regards

[harakiri]

yes, nice idea, thank you.

so far, i've tried the following:

void THIS::printX() {
 
  QPrintDialog dialog(&printer, this);
 
  QPixmap* tempXPixmap = new QPixmap;
  tempXPixmap->grabWidget(xLabel);
 
  if (dialog.exec()) {
    QPainter painter(&printer);
    QRect rect = painter.viewport();
    QSize size = tempXPixmap->size();
    size.scale(rect.size(), Qt::KeepAspectRatio);
    painter.setViewport(rect.x(), rect.y(), size.width(), size.height());
    painter.setWindow(tempXPixmap->rect());
    painter.drawPixmap(0, 0, *tempXPixmap);
  }
 
}

void THIS::printX() {

  QPrintDialog dialog(&printer, this);

  QPixmap* tempXPixmap = new QPixmap;
  tempXPixmap->grabWidget(xLabel);

  if (dialog.exec()) {
    QPainter painter(&printer);
    QRect rect = painter.viewport();
    QSize size = tempXPixmap->size();
    size.scale(rect.size(), Qt::KeepAspectRatio);
    painter.setViewport(rect.x(), rect.y(), size.width(), size.height());
    painter.setWindow(tempXPixmap->rect());
    painter.drawPixmap(0, 0, *tempXPixmap);
  }

}

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this results in a segmentation fault..

gdb backtrace:

(gdb) backtrace
#0 0xb61bc8f7 in __divdi3 () from /lib/libgcc_s.so.1
#1 0xb62a8c0a in QSize:: scale () from /usr/lib/libQtCore.so.4
#2 0x080ba2d2 in MainWindow:: printX ()
#3 0x080f0a4d in MainWindow:: qt_metacall ()
#4 0xb6330aa8 in QMetaObject:: activate () from /usr/lib/libQtCore.so.4
#5 0xb6330d2f in QMetaObject:: activate () from /usr/lib/libQtCore.so.4
#6 0xb64bf831 in QAction:: triggered () from /usr/lib/libQtGui.so.4
#7 0xb64c01bf in QAction:: activate () from /usr/lib/libQtGui.so.4
#8 0xb67c6fd4 in ?? () from /usr/lib/libQtGui.so.4
.....

so why doesn't the scale work? i used this method to print other pixmaps, is there a problem with the grabWidget() ?

[marcel]

Could be because painter->viewport() returns a default rect ( 0, 0, 0, 0). Therefore a division by 0 will occur in scale.

The default rect means that the paint device has an empty size ( 0, 0 ).

See if you can set in QPrinter the output media size. Otherwise use QPainter::setViewport().

The idea is to make sure the paint device has valid rect.

Regards

[marcel]

OK. Forget that !.

grabPixmap is static in QPixmap and returns the grabbed pix.
So you called it wrong there.

Should have been:

QPixmap pix = QPixmap::grabWidget(xLabel);

QPixmap pix = QPixmap::grabWidget(xLabel);

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Regards

[harakiri]

works fine - thanks marcel

[wysota]

How about:

QTextDocument doc(label->text());
QPrinter printer;
//...
doc.print(&printer);

QTextDocument doc(label->text());
QPrinter printer;
//...
doc.print(&printer);

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Of course you have to setup the printer first...