Promoting QLabel

[anafor2004]

this may be very simple project, I have to work harder.

[ashukla]

this may be very simple project, I have to work harder.

I have getting the another way;
label->setText("<hr>"+label->text());
but by this you can not specify the coordinates.

[wysota]

Guys... Try this please:

QFont f = label->font();
f.setStrikeOut(true);
label->setFont(f);
label->setText("xxxxx");

QFont f = label->font();
f.setStrikeOut(true);
label->setFont(f);
label->setText("xxxxx");

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Is that what you want?

[ashukla]

Guys... Try this please:

QFont f = label->font();
f.setStrikeOut(true);
label->setFont(f);
label->setText("xxxxx");

QFont f = label->font();
f.setStrikeOut(true);
label->setFont(f);
label->setText("xxxxx");

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Is that what you want?

Dear Sir!
The above code StrikeOut the text of QLabel. I want to draw a line of on any widget's Background. For example I take here QLabel. But I cann't understand why line is not drwan using the paintEvent.

[wysota]

Maybe it is drawn but then the widget overdraws it with its own paint event routine.

#include <QtGui>
 
class W : public QTextEdit {
public:
  W() : QTextEdit(){}
protected:
  void paintEvent(QPaintEvent *e){
    QTextEdit::paintEvent(e);
    QPainter p(viewport());
    QPen pe = p.pen();
    pe.setWidth(4);
    pe.setColor(Qt::red);
    p.setPen(pe);
    p.drawLine(rect().topLeft(), rect().bottomRight());
  }
};
 
int main(int argc, char **argv){
  QApplication app(argc, argv);
  W w;
  w.show();
  return app.exec();
}

#include <QtGui>

class W : public QTextEdit {
public:
  W() : QTextEdit(){}
protected:
  void paintEvent(QPaintEvent *e){
    QTextEdit::paintEvent(e);
    QPainter p(viewport());
    QPen pe = p.pen();
    pe.setWidth(4);
    pe.setColor(Qt::red);
    p.setPen(pe);
    p.drawLine(rect().topLeft(), rect().bottomRight());
  }
};

int main(int argc, char **argv){
  QApplication app(argc, argv);
  W w;
  w.show();
  return app.exec();
}

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[ashukla]

void paintEvent ( QPaintEvent * event )
{
	QTextEdit::paintEvent(event);
        QPainter painter(viewport());
	painter.setPen(Qt::blue);
	painter.drawLine(rect().topLeft(),rect().bottomRight());
}

void paintEvent ( QPaintEvent * event )
{
	QTextEdit::paintEvent(event);
        QPainter painter(viewport());
	painter.setPen(Qt::blue);
	painter.drawLine(rect().topLeft(),rect().bottomRight());
}

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It is working fine. I am forgotten to call viewport() and paintEvent inside paintEvent(). Thanks for your kind help.

[wysota]

You should have received a warning in the console.

[ashukla]

You should have received a warning in the console.

No, At this time I am not receiving any warning.

[wysota]

If you opened the painter on a wrong object you should have received a warning. Take my code and change "viewport()" to "this", run the application and look at the console.

[ashukla]

Yes, You are saying true in this regard; but I am telling about the below mentioned code.

void paintEvent ( QPaintEvent * event )
{
QTextEdit::paintEvent(event);
QPainter painter(viewport());
painter.setPen(Qt::blue);
painter.drawLine(rect().topLeft(),rect().bottomRight());
}

void paintEvent ( QPaintEvent * event )
{
QTextEdit::paintEvent(event);
QPainter painter(viewport());
painter.setPen(Qt::blue);
painter.drawLine(rect().topLeft(),rect().bottomRight());
}

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[wysota]

You said you "forgot to call viewport()". I understood that you didn't open a painter on it.