Qt Reference Documentation

# main.cpp Example File

animation/appchooser/main.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
     ** All rights reserved.
     ** Contact: Nokia Corporation (qt-info@nokia.com)
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     ** This file is part of the QtCore module of the Qt Toolkit.
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     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
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     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
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     **   * Redistributions of source code must retain the above copyright
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     **     notice, this list of conditions and the following disclaimer in
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     **     the names of its contributors may be used to endorse or promote
     **     products derived from this software without specific prior written
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     #include <QtCore>
     #include <QtGui>

     class Pixmap : public QGraphicsWidget
     {
         Q_OBJECT

     public:
         Pixmap(const QPixmap &pix, QGraphicsItem *parent = 0)
             : QGraphicsWidget(parent), orig(pix), p(pix)
         {
         }

         void paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
         {
             painter->drawPixmap(QPointF(), p);
         }

         virtual void mousePressEvent(QGraphicsSceneMouseEvent * )
         {
             emit clicked();
         }

         virtual void setGeometry(const QRectF &rect)
         {
             QGraphicsWidget::setGeometry(rect);

             if (rect.size().width() > orig.size().width())
                 p = orig.scaled(rect.size().toSize());
             else
                 p = orig;
         }

     Q_SIGNALS:
         void clicked();

     private:
         QPixmap orig;
         QPixmap p;
     };

     void createStates(const QObjectList &objects,
                       const QRect &selectedRect, QState *parent)
     {
         for (int i = 0; i < objects.size(); ++i) {
             QState *state = new QState(parent);
             state->assignProperty(objects.at(i), "geometry", selectedRect);
             parent->addTransition(objects.at(i), SIGNAL(clicked()), state);
         }
     }

     void createAnimations(const QObjectList &objects, QStateMachine *machine)
     {
         for (int i=0; i<objects.size(); ++i)
             machine->addDefaultAnimation(new QPropertyAnimation(objects.at(i), "geometry"));
     }

     int main(int argc, char **argv)
     {
         Q_INIT_RESOURCE(appchooser);

         QApplication app(argc, argv);

         Pixmap *p1 = new Pixmap(QPixmap(":/digikam.png"));
         Pixmap *p2 = new Pixmap(QPixmap(":/akregator.png"));
         Pixmap *p3 = new Pixmap(QPixmap(":/accessories-dictionary.png"));
         Pixmap *p4 = new Pixmap(QPixmap(":/k3b.png"));

         p1->setObjectName("p1");
         p2->setObjectName("p2");
         p3->setObjectName("p3");
         p4->setObjectName("p4");

         p1->setGeometry(QRectF(0.0, 0.0, 64.0, 64.0));
         p2->setGeometry(QRectF(236.0, 0.0, 64.0, 64.0));
         p3->setGeometry(QRectF(236.0, 236.0, 64.0, 64.0));
         p4->setGeometry(QRectF(0.0, 236.0, 64.0, 64.0));

         QGraphicsScene scene(0, 0, 300, 300);
         scene.setBackgroundBrush(Qt::white);
         scene.addItem(p1);
         scene.addItem(p2);
         scene.addItem(p3);
         scene.addItem(p4);

         QGraphicsView window(&scene);
         window.setFrameStyle(0);
         window.setAlignment(Qt::AlignLeft | Qt::AlignTop);
         window.setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
         window.setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

         QStateMachine machine;
         machine.setGlobalRestorePolicy(QStateMachine::RestoreProperties);

         QState *group = new QState(&machine);
         group->setObjectName("group");
         QRect selectedRect(86, 86, 128, 128);

         QState *idleState = new QState(group);
         group->setInitialState(idleState);

         QObjectList objects;
         objects << p1 << p2 << p3 << p4;
         createStates(objects, selectedRect, group);
         createAnimations(objects, &machine);

         machine.setInitialState(group);
         machine.start();

         window.resize(300, 300);
         window.show();

         return app.exec();
     }

     #include "main.moc"