Qt Reference Documentation

# movementtransition.h Example File

statemachine/rogue/movementtransition.h

     /****************************************************************************
     **
     ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
     ** All rights reserved.
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** This file is part of the documentation of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
     **     the names of its contributors may be used to endorse or promote
     **     products derived from this software without specific prior written
     **     permission.
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     #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;
             }
             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_4:
                     window->movePlayer(Window::Left);
                     break;
                 case Qt::Key_8:
                     window->movePlayer(Window::Up);
                     break;
                 case Qt::Key_6:
                     window->movePlayer(Window::Right);
                     break;
                 case Qt::Key_2:
                     window->movePlayer(Window::Down);
                     break;
                 default:
                     ;
             }
         }

     private:
         Window *window;
     };

     #endif