Hi

I'm trying to subclass these 2 classes in order to get an editable text element which I can lay out on QGraphicsWidget. The code for the resulting class is shown below. The problem is that when I add my subclass instance to any QGraphicsLayout - it just crashes. The stack trace indicates a problem in the QGraphicsItem::setParent() function.

I created a similar subclass from QAbstractGraphicsShapeItem and QGraphicsLayoutItem, and it works fine - no crashing.


Qt Code: 
  1. class TextEdit : public QGraphicsTextItem, public QGraphicsLayoutItem {
  2. 		Q_OBJECT
  3. 	public:
  4. 		enum { Type = UserType + 2 };
  5.  
  6. 		TextEdit(const QString &text = QString(), QGraphicsItem *parent = 0);
  7. 		~TextEdit();
  8.  
  9. 		int type() const { return Type; }
  10.  
  11. 		QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const;
  12. 		void setGeometry(const QRectF &rect);
  13. };
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Qt Code: 
  1. #include "rTextEdit.h"
  2.  
  3.  
  4. #include <QtGui>
  5.  
  6.  
  7. 	TextEdit::TextEdit(const QString &text, QGraphicsItem *parent) 
  8. 	: QGraphicsTextItem(text, parent), QGraphicsLayoutItem(0, false)
  9. 	{
  10.  
  11. 	}
  12.  
  13. 	TextEdit::~TextEdit()
  14. 	{
  15. 	}
  16. 	QSizeF TextEdit::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
  17. 	{
  18. 		switch (which) {
  19. 			case Qt::MinimumSize:
  20. 				return QSizeF(0, 0);
  21.             case Qt::PreferredSize:
  22.                 return document()->size();                                                                                            
  23.             case Qt::MaximumSize:
  24.                 return QSizeF(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
  25.             default:
  26.                 qWarning("r::TextEdit::sizeHint(): Don't know how to handle the value of 'which'");
  27.                 break;		
  28. 		}
  29. 		return constraint;
  30. 	}
  31.  
  32. 	void TextEdit::setGeometry(const QRectF &rect)
  33. 	{
  34. 		setTextWidth(rect.width());
  35. 		setPos(rect.topLeft());
  36. 	}
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