diagramtextitem.h

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#ifndef DIAGRAMTEXTITEM_H
#define DIAGRAMTEXTITEM_H

#include <QGraphicsTextItem>
#include <QPen>

QT_BEGIN_NAMESPACE
class QFocusEvent;
class QGraphicsItem;
class QGraphicsScene;
class QGraphicsSceneMouseEvent;
QT_END_NAMESPACE

//! [0]
// The TextDiagramItem class inherits QGraphicsTextItem and adds the possibility to move editable text items. Editable QGraphicsTextItems are designed to be fixed in place and editing starts when the user single clicks on the item. With DiagramTextItem the editing starts with a double click leaving single click available to interact with and move it.
// We use itemChange() and focusOutEvent() to notify the DiagramScene when the text item loses focus and gets selected.
// We reimplement the functions that handle mouse events to make it possible to alter the mouse behavior of QGraphicsTextItem.
class DiagramTextItem : public QGraphicsTextItem
{
    Q_OBJECT

public:
    enum { Type = UserType + 3 };

    DiagramTextItem(QGraphicsItem *parent = 0);

    int type() const Q_DECL_OVERRIDE { return Type; }

signals:
    void lostFocus(DiagramTextItem *item);
    void selectedChange(QGraphicsItem *item);

protected:
    QVariant itemChange(GraphicsItemChange change, const QVariant &value) Q_DECL_OVERRIDE;
    void focusOutEvent(QFocusEvent *event) Q_DECL_OVERRIDE;
    void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event) Q_DECL_OVERRIDE;
};
//! [0]

#endif // DIAGRAMTEXTITEM_H