QGraphicsTextItem Vertical text alignment

[mbra]

My label creator application requires to align text(QGraphicsTextItem) horizontaly and vertically within a given boundingRect.
So far I'm NOT able to come up with a way to make vertical alignment work for Qt::AlignTop, Qt::AlignBottom, and Qt::AlignVCenter.
Horizontal alignment works ok.

Any suggestion for making vertical alignment work in a QGraphicsTextItem?


QRectF BaseTextItem::boundingRect() const
{
return QRectF(0,0,310,100);

}
void BaseTextItem::alignVerticalTest()
{
QTextDocument *text_document = this->document();
QTextOption alignment_option(Qt::AlignBottom);
text_document->setDefaultTextOption(alignment_option);
this->setDocument(text_document);
}

[Lykurg]

Wouldn't it be easier if you use a normal item and do the painting yourself? then you could use QPainter::drawText().

QPainter painter(this);
painter.drawText(boundingRect(), Qt::AlignCenter, tr("Qt by\nNokia"));

QPainter painter(this);
painter.drawText(boundingRect(), Qt::AlignCenter, tr("Qt by\nNokia"));

To copy to clipboard, switch view to plain text mode 

If you have to use a text item I think (it's long time ago) you have to set the page size of the document to the bounding rect: QTextDocument::setPageSize().

[Jarikus]

Sample easy and good work alignment in QGraphicsTextItem

class DiagramTextItem : public QGraphicsTextItem
{
    Q_OBJECT
 
public:
	enum { Type = UserType + 3 };
    DiagramTextItem(QGraphicsItem *parent = 0, QGraphicsScene *scene = 0);
	void setBoundingRect( qreal x, qreal y, qreal w, qreal h);
	void setText( const QString &inText );
 
signals:
 
protected:
	void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
	QRectF boundingRect() const;
 
private:
	QRectF myBoundRect;
	QTextOption textOp;
	QString text;
};

class DiagramTextItem : public QGraphicsTextItem
{
    Q_OBJECT

public:
	enum { Type = UserType + 3 };
    DiagramTextItem(QGraphicsItem *parent = 0, QGraphicsScene *scene = 0);
	void setBoundingRect( qreal x, qreal y, qreal w, qreal h);
	void setText( const QString &inText );

signals:

protected:
	void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
	QRectF boundingRect() const;

private:
	QRectF myBoundRect;
	QTextOption textOp;
	QString text;
};

To copy to clipboard, switch view to plain text mode 

DiagramTextItem::DiagramTextItem(QGraphicsItem *parent, QGraphicsScene *scene)
    : QGraphicsTextItem(parent, scene)
{
	myBoundRect.setRect( 0, 0, 0, 0 );
 
	textOp.setAlignment( Qt::AlignCenter );
	textOp.setWrapMode( QTextOption::WrapAtWordBoundaryOrAnywhere );
}
 
void DiagramTextItem::paint(QPainter *painter, const QStyleOptionGraphicsItem 
*option, QWidget *widget)
{
	//painter->drawRect( boundingRect() );
 
	painter->drawText(	boundingRect(),
						text,
						textOp);
 
	QGraphicsTextItem::paint(painter, option, widget);
}
 
QRectF DiagramTextItem::boundingRect() const
{
 	return myBoundRect;
}
 
void DiagramTextItem::setBoundingRect( qreal x, qreal y, qreal w, qreal h)
{
	myBoundRect.setRect( x, y, w, h );
}
 
void DiagramTextItem::setText( const QString &inText )
{
	text = inText;
	update();
}

DiagramTextItem::DiagramTextItem(QGraphicsItem *parent, QGraphicsScene *scene)
    : QGraphicsTextItem(parent, scene)
{
	myBoundRect.setRect( 0, 0, 0, 0 );

	textOp.setAlignment( Qt::AlignCenter );
	textOp.setWrapMode( QTextOption::WrapAtWordBoundaryOrAnywhere );
}

void DiagramTextItem::paint(QPainter *painter, const QStyleOptionGraphicsItem 
*option, QWidget *widget)
{
	//painter->drawRect( boundingRect() );

	painter->drawText(	boundingRect(),
						text,
						textOp);

	QGraphicsTextItem::paint(painter, option, widget);
}

QRectF DiagramTextItem::boundingRect() const
{
 	return myBoundRect;
}

void DiagramTextItem::setBoundingRect( qreal x, qreal y, qreal w, qreal h)
{
	myBoundRect.setRect( x, y, w, h );
}

void DiagramTextItem::setText( const QString &inText )
{
	text = inText;
	update();
}

To copy to clipboard, switch view to plain text mode