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) Q_DECL_OVERRIDE {
          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) Q_DECL_OVERRIDE {
          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