Make QGraphicsTextItem show the cursor being moved

napajejenunedk0

I am trying to make a QGraphicsTextItem that has constant width, follow its cursor when the latter moves.

@
#include <QtGui/QCursor>
#include <QtGui/QTextCursor>
#include <QtGui/QTextDocument>
#include <QtGui/QGraphicsTextItem>

class GraphicsTextEditor : public QGraphicsTextItem
{
Q_OBJECT
public:
GraphicsTextEditor(QGraphicsItem *parent = 0)
: QGraphicsTextItem( parent )
{
this->init();
}

GraphicsTextEditor(const QString &text, QGraphicsItem *parent = 0)
    : QGraphicsTextItem( text, parent )
{
    this->init();
}

virtual QRectF boundingRect() const
{
    static const int FIXED_WIDTH = 100;
    const QRectF bounds = QGraphicsTextItem::boundingRect();
    return QRect( bounds.left(), bounds.top(), FIXED_WIDTH, bounds.height() );
}

private slots:
void onTextCursorPositionChanged(const QTextCursor &textCursor)
{
QCursor c = this->cursor();
c.setPos( textCursor.position(), c.pos().y() );
this->setCursor( c );
}

private:
void init()
{
this->setTextInteractionFlags( Qt::TextEditorInteraction );
connect( this->document(),
SIGNAL(cursorPositionChanged(QTextCursor)),
SLOT(onTextCursorPositionChanged(QTextCursor)));
}
};
@

I don't want to achieve the behavior of QGraphicsTextItem::setTextWidth - I want the QGraphicsTextItem to be single-line text editor that scrolls its text to the position of its cursor (the visual one) when the cursor moves. Moving the cursor in edit mode doesn't change the QGraphicsTextItem::textCursor's position - only the QGraphicsItem::cursor's one. Setting the QGraphicsItem::cursor's position doesn't make QGraphicsTextItem show the text which the cursor points at.