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# diagramtextitem.cpp Example File
graphicsview/diagramscene/diagramtextitem.cpp

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     #include <QtGui>

     #include "diagramtextitem.h"
     #include "diagramscene.h"

     DiagramTextItem::DiagramTextItem(QGraphicsItem *parent, QGraphicsScene *scene)
         : QGraphicsTextItem(parent, scene)
     {
         setFlag(QGraphicsItem::ItemIsMovable);
         setFlag(QGraphicsItem::ItemIsSelectable);
     }

     QVariant DiagramTextItem::itemChange(GraphicsItemChange change,
                          const QVariant &value)
     {
         if (change == QGraphicsItem::ItemSelectedChange)
             emit selectedChange(this);
         return value;
     }

     void DiagramTextItem::focusOutEvent(QFocusEvent *event)
     {
         setTextInteractionFlags(Qt::NoTextInteraction);
         emit lostFocus(this);
         QGraphicsTextItem::focusOutEvent(event);
     }

     void DiagramTextItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
     {
         scene()->clearSelection();
         QGraphicsTextItem::mousePressEvent(event);
         setSelected(true);
     }

     void DiagramTextItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
     {
         if (textInteractionFlags() & Qt::TextEditable) {
             QGraphicsTextItem::mouseMoveEvent(event);
         } else
             QGraphicsItem::mouseMoveEvent(event);
     }

     void DiagramTextItem::mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event)
     {
         setTextInteractionFlags(Qt::TextEditorInteraction);
         QGraphicsSceneMouseEvent *mouseEvent =
             new QGraphicsSceneMouseEvent(QEvent::GraphicsSceneMousePress);
         mouseEvent->setAccepted(true);
         mouseEvent->setPos(event->pos());
         mouseEvent->setScenePos(event->scenePos());
         mouseEvent->setScreenPos(event->screenPos());
         mouseEvent->setButtonDownPos(Qt::LeftButton,
             event->buttonDownPos(Qt::LeftButton));
         mouseEvent->setButtonDownScreenPos(Qt::LeftButton,
             event->buttonDownScreenPos(Qt::LeftButton));
         mouseEvent->setButtonDownScenePos(Qt::LeftButton,
             event->buttonDownScenePos(Qt::LeftButton));
         mouseEvent->setWidget(event->widget());

         QGraphicsTextItem::mousePressEvent(mouseEvent);

         delete mouseEvent;
     }