Hi,
In your call metrics.boundingRect, you have specified height=0. Doesn't
that make the QRect invalid? The help for this function states "The
drawing, and hence the bounding rectangle, is constrained to the
rectangle rect." - so you need to pass a very large value for height,
and it should then work.
Regards, Tony
On 28/11/2017 12:06 PM, sq wrote:
Hello, in QT4.8 I have the following code, want to calculate the size
of the rectangle with the line break, the result of the rect did not
wrap at all.
How can I get the size of rect that a long QString needed
text-wrapped automatically?Thanks very much!
QPainter painter(this);
QString text("1234567890123456789012345678901234567890"
"1234567890123456789012345678901234567890"
"1234567890123456789012345678901234567890"
"1234567890123456789012345678901234567890");
int width = this->width()-40;
int flags = Qt::TextWordWrap;
qDebug()<<"font:"<<painter.font().pointSize()<<",pixelSize="<<painter.font().pixelSize();
QFontMetrics metrics = painter.fontMetrics();
QRect textBoundingRect =
metrics.boundingRect(QRect(0,0,width,0),flags,text);
painter.translate(20,20);
painter.drawRect(textBoundingRect);
painter.drawText(textBoundingRect,Qt::TextWordWrap,text);
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