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    41 

    42 #ifndef MOVEMENTTRANSITION_H

    43 #define MOVEMENTTRANSITION_H

    44 

    45 #include <QtGui>

    46 

    47 #include "window.h"

    48 

    49 //![0]

    50 class MovementTransition : public QEventTransition

    51 {

    52     Q_OBJECT

    53 

    54 public:

    55     MovementTransition(Window *window) :

    56         QEventTransition(window, QEvent::KeyPress) {

    57         this->window = window;

    58     }

    59 //![0]

    60 

    61 //![1]

    62 protected:

    63     bool eventTest(QEvent *event) {

    64         if (event->type() == QEvent::StateMachineWrapped &&

    65             static_cast<QStateMachine::WrappedEvent *>(event)->event()->type() == QEvent::KeyPress) {

    66             QEvent *wrappedEvent = static_cast<QStateMachine::WrappedEvent *>(event)->event();

    67 

    68             QKeyEvent *keyEvent = static_cast<QKeyEvent *>(wrappedEvent);

    69             int key = keyEvent->key();

    70 

    71             return key == Qt::Key_2 || key == Qt::Key_8 || key == Qt::Key_6 ||

    72                    key == Qt::Key_4;

    73         }

    74         return false;

    75     }

    76 //![1]

    77 

    78 //![2]

    79     void onTransition(QEvent *event) {

    80         QKeyEvent *keyEvent = static_cast<QKeyEvent *>(

    81             static_cast<QStateMachine::WrappedEvent *>(event)->event());

    82 

    83         int key = keyEvent->key();

    84         switch (key) {

    85             case Qt::Key_4:

    86                 window->movePlayer(Window::Left);

    87                 break;

    88             case Qt::Key_8:

    89                 window->movePlayer(Window::Up);

    90                 break;

    91             case Qt::Key_6:

    92                 window->movePlayer(Window::Right);

    93                 break;

    94             case Qt::Key_2:

    95                 window->movePlayer(Window::Down);

    96                 break;

    97             default:

    98                 ;

    99         }

   100     }

   101 //![2]

   102 

   103 private:

   104     Window *window;

   105 };

   106 

   107 #endif

   108