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To explain why the ability to generate random numbers securely is important, we consider a simple protocol. Consider a scenario in which Alice and Bob know each other s public keys and would like to exchange secret messages. A public key cryptosystem such as RSA is about 1,000 times slower than, say, Triple DES. Hence, to allow Alice and Bob to efficiently exchange confidential information, we could have Alice simply choose a random number, s, and send that random number to Bob, encrypted with Bob s public key. Only Bob will be able to use his private key to decrypt s. Once Bob receives s encrypted, he decrypts it, and can start using s as a key for a symmetric cipher.

Listing 7-26. Painting the handles void HandleItem::paint( QPainter *paint, const QStyleOptionGraphicsItem *option, QWidget *widget ) { paint->setPen( m_color ); paint->setBrush( m_color ); QRectF rect = boundingRect(); QVector<QPointF> points; switch( m_role ) { case CenterHandle: paint->drawEllipse( rect ); break; case RightHandle: points << rect.center()+QPointF(3,0) << rect.center()+QPointF(-3,-5) << rect.center()+QPointF(-3,5); paint->drawConvexPolygon( QPolygonF(points) ); break; case TopHandle: points << rect.center()+QPointF(0,-3) << rect.center()+QPointF(-5,3) << rect.center()+QPointF(5,3); paint->drawConvexPolygon( QPolygonF(points) ); break; } } After you determine where to paint and then paint the handles, the next step is to wait for user interaction. Listing 7-27 shows the methods for handling mouse button events such as press and release. Because you set the ItemIsMoveable flag earlier in the constructor, all you have to do is update the m_pressed variable before passing the event on the QGraphicsItem handler. Listing 7-27. Handling the mouse press and release events void HandleItem::mousePressEvent( QGraphicsSceneMouseEvent *event ) { m_pressed = true; QGraphicsItem::mousePressEvent( event ); } void HandleItem::mouseReleaseEvent( QGraphicsSceneMouseEvent *event ) { m_pressed = false; QGraphicsItem::mouseReleaseEvent( event ); }

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There are plenty of other things you can do to specify information about the schema. The following are all supported: Overriding some of the metadata for columns obtained by reflection Specifying the schema name for databases that support the concept of multiple schemas Cascading updates and deletes for databases supporting them Handling database-specific options such as MySQL s table back ends including InnoDB or MyISAM Default values Dropping tables Adding constraints, indexes, sequences, and more These are all described in detail at http://www.sqlalchemy.org/docs/05/metadata.html.

When a user chooses to move a handle, the itemChange method is invoked. This method gives you a chance to react to (or even stop) a change (you can see the implementation in Listing 7-28). I cut out the parts of the listing that handle movements of the different roles (you will look at them later); the listing shows only the outer framework. Simply let programmatic movements and changes that aren t related to movements pass through to the corresponding QGraphicsItem method. If you run into a user-invoked position change, you act differently depending on the role of the handle. But first the actual movement is calculated by comparing the new position with the current position. The new position is passed through the data argument, while the current position is given from the pos method. You also determine the center point of the shape being handled because it is used when handling both the right and top handles. Listing 7-28. Handling changes to the handle QVariant HandleItem::itemChange( GraphicsItemChange change, const QVariant &data ) { if( change == ItemPositionChange && m_pressed ) { QPointF movement = data.toPoint() - pos(); QPointF center = m_item->boundingRect().center(); switch( m_role ) { ... } } return QGraphicsItem::itemChange( change, data ); } Listing 7-29 shows how to handle a user-invoked position change of a center handle. Move the item that is being handled, m_item, by using a moveBy call. All the handles in the m_handles list are translated into place because any right and top handles must follow the shape they are handling. Listing 7-29. Handle movements of a center handle switch( m_role ) { case CenterHandle: m_item->moveBy( movement.x(), movement.y() ); foreach( HandleItem *handle, m_handles ) handle->translate( movement.x(), movement.y() );

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