Subclassing QGraphicsTextItem and QGraphicsLayoutItem

[psih128]

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.

class TextEdit : public QGraphicsTextItem, public QGraphicsLayoutItem {
		Q_OBJECT
	public:
		enum { Type = UserType + 2 };
 
		TextEdit(const QString &text = QString(), QGraphicsItem *parent = 0);
		~TextEdit();
 
		int type() const { return Type; }
 
		QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const;
		void setGeometry(const QRectF &rect);
};

class TextEdit : public QGraphicsTextItem, public QGraphicsLayoutItem {
		Q_OBJECT
	public:
		enum { Type = UserType + 2 };
		
		TextEdit(const QString &text = QString(), QGraphicsItem *parent = 0);
		~TextEdit();
		
		int type() const { return Type; }
		
		QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const;
		void setGeometry(const QRectF &rect);
};

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#include "rTextEdit.h"
 
 
#include <QtGui>
 
 
	TextEdit::TextEdit(const QString &text, QGraphicsItem *parent) 
	: QGraphicsTextItem(text, parent), QGraphicsLayoutItem(0, false)
	{
 
	}
 
	TextEdit::~TextEdit()
	{
	}
	QSizeF TextEdit::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
	{
		switch (which) {
			case Qt::MinimumSize:
				return QSizeF(0, 0);
            case Qt::PreferredSize:
                return document()->size();                                                                                            
            case Qt::MaximumSize:
                return QSizeF(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
            default:
                qWarning("r::TextEdit::sizeHint(): Don't know how to handle the value of 'which'");
                break;		
		}
		return constraint;
	}
 
	void TextEdit::setGeometry(const QRectF &rect)
	{
		setTextWidth(rect.width());
		setPos(rect.topLeft());
	}

#include "rTextEdit.h"


#include <QtGui>


	TextEdit::TextEdit(const QString &text, QGraphicsItem *parent) 
	: QGraphicsTextItem(text, parent), QGraphicsLayoutItem(0, false)
	{
	
	}
	
	TextEdit::~TextEdit()
	{
	}
	QSizeF TextEdit::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
	{
		switch (which) {
			case Qt::MinimumSize:
				return QSizeF(0, 0);
            case Qt::PreferredSize:
                return document()->size();                                                                                            
            case Qt::MaximumSize:
                return QSizeF(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
            default:
                qWarning("r::TextEdit::sizeHint(): Don't know how to handle the value of 'which'");
                break;		
		}
		return constraint;
	}
	
	void TextEdit::setGeometry(const QRectF &rect)
	{
		setTextWidth(rect.width());
		setPos(rect.topLeft());
	}

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[psih128]

Ok Trolltech confirmed that this seems to be a bug. A task has been opened: ID 228878

[patrik08]

you can draw && edit text image on top QGraphicsRectItem.
It run....

QGraphicsRectItem can resize rotate any direction ....

class TextMount;   /* virtual QTextControl  like QTextEdit  */
class TextLayer : public QObject, public QGraphicsRectItem

class TextMount;   /* virtual QTextControl  like QTextEdit  */
class TextLayer : public QObject, public QGraphicsRectItem

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http://code.google.com/p/fop-miniscribus/
or
http://fop-miniscribus.googlecode.co...nk/QTextPanel/

or like paper print on QAbstractScrollArea
http://fop-miniscribus.googlecode.co.../draw_paper.1/

or try QGraphicsSimpleTextItem if only words