Qt Reference Documentation

# movementtransition.h Example File

statemachine/rogue/movementtransition.h

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     #ifndef MOVEMENTTRANSITION_H
     #define MOVEMENTTRANSITION_H

     #include <QtGui>

     #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