I draw a QTextDocument on QGraphicsItem to edit xhtml <div> layer

on a separate QObject i handle all text like QTextControl i connect my timer from blink cursor and the doc
Qt Code: 
  1. d = new QTextDocument(this);
  2. _layout = _d->documentLayout(); 
  3. connect ....
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by timer event on blink cursor i update only his rect,
now i have trouble to handle QAbstractTextDocumentLayout

cursor blink run , i can edit document , move its , and all other...
only text Highlight by selection from cursor not run...

On line 36 from this code i have a true selecection by text
selectAll(); or word select i send the update request and his not draw :-( why,

note C_cursor ist the original QTextCursor from selection...

Qt Code: 
  1. /* child from class TextLayer : public QObject, public QGraphicsItem */
  2.  
  3. void MountTextPrivate::paint_doc(  QPainter * painter ,
  4.                          const QStyleOptionGraphicsItem *option , 
  5.                          QBrush BGpage , 
  6.                          const QRectF fulllayer ,  
  7.                          bool alternate )
  8. {
  9.  
  10.  
  11. 	  /* Layer Background draw! */
  12. 		painter->save();
  13. 		painter->setPen(Qt::NoPen);
  14. 		painter->setBrush(BGpage);
  15. 		painter->drawRect(fulllayer);
  16. 		painter->restore();
  17. 	  /* rect from frame root QTextDocument*/
  18. 	  QRectF doc_rect = boundingRect();
  19.  
  20. 		QColor BackHightlight("#a6ffc7");
  21. 					 BackHightlight.setAlpha(140);
  22.  
  23. 		QAbstractTextDocumentLayout::PaintContext CTX;    
  24. 		CTX.selections;
  25. 		 if (doc_rect.isValid()) {
  26. 					painter->setClipRect(doc_rect, Qt::IntersectClip);
  27. 					CTX.clip = doc_rect;
  28. 		 }
  29. 		CTX.palette.setColor(QPalette::Highlight,BackHightlight);
  30. 		CTX.palette.setColor(QPalette::HighlightedText,Qt::black);
  31. 		/* blink cursor from timer event ! */
  32. 		if (cursortime) {
  33. 		CTX.cursorPosition = cursor_position;
  34. 		}
  35.  
  36. 	  if (C_cursor.hasSelection()) {
  37. 		  QAbstractTextDocumentLayout::Selection Internal_selection;
  38. 		  Internal_selection.cursor = C_cursor;
  39. 		  CTX.selections.append(Internal_selection);
  40. 	  }
  41.     _layout->draw(painter,CTX);
  42. }
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