Displaying richtext on ItemWidgets

[arbi]

Hi,

i am new at QT and just started to read Qt examples and tutorials.

i want to display richtext formatted by using HTML-tags ,like QLabel does, in the qt item widgets ( i.e QListWidget,QTableWidget etc. ). I don't know what should my starting point. Defining a custom delegate or inheriting Item classes. Or do i have to use item views instead?

what is the easiest way for that?

[wysota]

The easiest way is to search the forum for similar issues.

[arbi]

i have found some similar issue to my question at the forum thread :

http://www.qtcentre.org/forum/f-qt-p...thod-8660.html


there , QTextDocument is been mentioned as the solution to render rich text
on the paint() method of custom Delegate.

QTextDocument::drawContents() is introduced by Qt 4.2

İ am using Qt. Coomercial 4.1.3.

arent there any "Qt. 4.1.3 before" solution for rendering RichText on paint().?


BTW; i keep searching on this both at forum and swhr else. no need to remind that


thanks...

[wysota]

You can still you QTextDocument through its text layout, as far as I remember.

[arbi]

ok.

i finally found one of your early posts on this topic which gives a sample code

void CommentDelegate::paint( QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index ) const
      {
          painter->save();
          QTextDocument doc;
          doc.setHtml( index.data().toString() );
          QAbstractTextDocumentLayout::PaintContext context;
          doc.setPageSize( option.rect.size());
          painter->translate(option.rect.x(), option.rect.y());
          doc.documentLayout()->draw(painter, context);
          painter->restore();
      }

void CommentDelegate::paint( QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index ) const
      {
          painter->save();
          QTextDocument doc;
          doc.setHtml( index.data().toString() );
          QAbstractTextDocumentLayout::PaintContext context;
          doc.setPageSize( option.rect.size());
          painter->translate(option.rect.x(), option.rect.y());
          doc.documentLayout()->draw(painter, context);
          painter->restore();
      }

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i used this method and it worked. But now there is another problem of obtaining
right size values to be returned from sizeHint() function.

i am reimplementing the sizeHint() method of the Delegate and for the time being, i am just returning a constant size of QSize(200,250). But of course this should be determined by the content of the item to be displayed. For large contents; some of the text are just lost behind the content of next item.

i tried QTextDocument:ageSize() and QTextDocument::documentLayout()->documentSize() methods , after setting the content of the QTextDocument object , but it didnt worked.

any suggestions appreciated.. thanks...