movementtransition.h Example File

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 #ifndef MOVEMENTTRANSITION_H
 #define MOVEMENTTRANSITION_H

 #include <QtWidgets>

 #include "window.h"

 class MovementTransition : public QEventTransition
 {
     Q_OBJECT

 public:
     MovementTransition(Window *window) :
         QEventTransition(window, QEvent::KeyPress) {
         this->window = window;
     }

 protected:
     bool eventTest(QEvent *event) {
         if (event->type() == QEvent::StateMachineWrapped &&
             static_cast<QStateMachine::WrappedEvent *>(event)->event()->type() == QEvent::KeyPress) {
             QEvent *wrappedEvent = static_cast<QStateMachine::WrappedEvent *>(event)->event();

             QKeyEvent *keyEvent = static_cast<QKeyEvent *>(wrappedEvent);
             int key = keyEvent->key();

             return key == Qt::Key_2 || key == Qt::Key_8 || key == Qt::Key_6 ||
                    key == Qt::Key_4 || key == Qt::Key_Down || key == Qt::Key_Up ||
                    key == Qt::Key_Right || key == Qt::Key_Left;
         }
         return false;
     }

     void onTransition(QEvent *event) {
         QKeyEvent *keyEvent = static_cast<QKeyEvent *>(
             static_cast<QStateMachine::WrappedEvent *>(event)->event());

         int key = keyEvent->key();
         switch (key) {
             case Qt::Key_Left:
             case Qt::Key_4:
                 window->movePlayer(Window::Left);
                 break;
             case Qt::Key_Up:
             case Qt::Key_8:
                 window->movePlayer(Window::Up);
                 break;
             case Qt::Key_Right:
             case Qt::Key_6:
                 window->movePlayer(Window::Right);
                 break;
             case Qt::Key_Down:
             case Qt::Key_2:
                 window->movePlayer(Window::Down);
                 break;
             default:
                 ;
         }
     }

 private:
     Window *window;
 };

 #endif