- Qt 5.5
- Qt Widgets
- States Example
- main.cpp Example File
- Qt 5.5.1 Reference Documentation

# main.cpp Example File

animation/states/main.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the QtCore module 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 The Qt Company Ltd 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
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    ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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    #include <QtWidgets>

    class Pixmap : public QGraphicsObject
    {
        Q_OBJECT
    public:
        Pixmap(const QPixmap &pix) : QGraphicsObject(), p(pix)
        {
        }

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

        QRectF boundingRect() const Q_DECL_OVERRIDE
        {
            return QRectF( QPointF(0, 0), p.size());
        }

    private:
        QPixmap p;
    };

    class GraphicsView : public QGraphicsView
    {
    public:
        GraphicsView(QGraphicsScene *scene) : QGraphicsView(scene)
        {
        }

        virtual void resizeEvent(QResizeEvent *) Q_DECL_OVERRIDE
        {
            fitInView(sceneRect(), Qt::KeepAspectRatio);
        }
    };

    int main(int argc, char *argv[])
    {
        Q_INIT_RESOURCE(states);

        QApplication app(argc, argv);

        // Text edit and button
        QTextEdit *edit = new QTextEdit;
        edit->setText("asdf lkjha yuoiqwe asd iuaysd u iasyd uiy "
                      "asdf lkjha yuoiqwe asd iuaysd u iasyd uiy "
                      "asdf lkjha yuoiqwe asd iuaysd u iasyd uiy "
                      "asdf lkjha yuoiqwe asd iuaysd u iasyd uiy!");

        QPushButton *button = new QPushButton;
        QGraphicsProxyWidget *buttonProxy = new QGraphicsProxyWidget;
        buttonProxy->setWidget(button);
        QGraphicsProxyWidget *editProxy = new QGraphicsProxyWidget;
        editProxy->setWidget(edit);

        QGroupBox *box = new QGroupBox;
        box->setFlat(true);
        box->setTitle("Options");

        QVBoxLayout *layout2 = new QVBoxLayout;
        box->setLayout(layout2);
        layout2->addWidget(new QRadioButton("Herring"));
        layout2->addWidget(new QRadioButton("Blue Parrot"));
        layout2->addWidget(new QRadioButton("Petunias"));
        layout2->addStretch();

        QGraphicsProxyWidget *boxProxy = new QGraphicsProxyWidget;
        boxProxy->setWidget(box);

        // Parent widget
        QGraphicsWidget *widget = new QGraphicsWidget;
        QGraphicsLinearLayout *layout = new QGraphicsLinearLayout(Qt::Vertical, widget);
        layout->addItem(editProxy);
        layout->addItem(buttonProxy);
        widget->setLayout(layout);

        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"));
        Pixmap *p5 = new Pixmap(QPixmap(":/help-browser.png"));
        Pixmap *p6 = new Pixmap(QPixmap(":/kchart.png"));

        QGraphicsScene scene(0, 0, 400, 300);
        scene.setBackgroundBrush(scene.palette().window());
        scene.addItem(widget);
        scene.addItem(boxProxy);
        scene.addItem(p1);
        scene.addItem(p2);
        scene.addItem(p3);
        scene.addItem(p4);
        scene.addItem(p5);
        scene.addItem(p6);

        QStateMachine machine;
        QState *state1 = new QState(&machine);
        QState *state2 = new QState(&machine);
        QState *state3 = new QState(&machine);
        machine.setInitialState(state1);

        // State 1
        state1->assignProperty(button, "text", "Switch to state 2");
        state1->assignProperty(widget, "geometry", QRectF(0, 0, 400, 150));
        state1->assignProperty(box, "geometry", QRect(-200, 150, 200, 150));
        state1->assignProperty(p1, "pos", QPointF(68, 200)); // 185));
        state1->assignProperty(p2, "pos", QPointF(168, 200)); // 185));
        state1->assignProperty(p3, "pos", QPointF(268, 200)); // 185));
        state1->assignProperty(p4, "pos", QPointF(68 - 150, 48 - 150));
        state1->assignProperty(p5, "pos", QPointF(168, 48 - 150));
        state1->assignProperty(p6, "pos", QPointF(268 + 150, 48 - 150));
        state1->assignProperty(p1, "rotation", qreal(0));
        state1->assignProperty(p2, "rotation", qreal(0));
        state1->assignProperty(p3, "rotation", qreal(0));
        state1->assignProperty(p4, "rotation", qreal(-270));
        state1->assignProperty(p5, "rotation", qreal(-90));
        state1->assignProperty(p6, "rotation", qreal(270));
        state1->assignProperty(boxProxy, "opacity", qreal(0));
        state1->assignProperty(p1, "opacity", qreal(1));
        state1->assignProperty(p2, "opacity", qreal(1));
        state1->assignProperty(p3, "opacity", qreal(1));
        state1->assignProperty(p4, "opacity", qreal(0));
        state1->assignProperty(p5, "opacity", qreal(0));
        state1->assignProperty(p6, "opacity", qreal(0));

        // State 2
        state2->assignProperty(button, "text", "Switch to state 3");
        state2->assignProperty(widget, "geometry", QRectF(200, 150, 200, 150));
        state2->assignProperty(box, "geometry", QRect(9, 150, 190, 150));
        state2->assignProperty(p1, "pos", QPointF(68 - 150, 185 + 150));
        state2->assignProperty(p2, "pos", QPointF(168, 185 + 150));
        state2->assignProperty(p3, "pos", QPointF(268 + 150, 185 + 150));
        state2->assignProperty(p4, "pos", QPointF(64, 48));
        state2->assignProperty(p5, "pos", QPointF(168, 48));
        state2->assignProperty(p6, "pos", QPointF(268, 48));
        state2->assignProperty(p1, "rotation", qreal(-270));
        state2->assignProperty(p2, "rotation", qreal(90));
        state2->assignProperty(p3, "rotation", qreal(270));
        state2->assignProperty(p4, "rotation", qreal(0));
        state2->assignProperty(p5, "rotation", qreal(0));
        state2->assignProperty(p6, "rotation", qreal(0));
        state2->assignProperty(boxProxy, "opacity", qreal(1));
        state2->assignProperty(p1, "opacity", qreal(0));
        state2->assignProperty(p2, "opacity", qreal(0));
        state2->assignProperty(p3, "opacity", qreal(0));
        state2->assignProperty(p4, "opacity", qreal(1));
        state2->assignProperty(p5, "opacity", qreal(1));
        state2->assignProperty(p6, "opacity", qreal(1));

        // State 3
        state3->assignProperty(button, "text", "Switch to state 1");
        state3->assignProperty(p1, "pos", QPointF(0, 5));
        state3->assignProperty(p2, "pos", QPointF(0, 5 + 64 + 5));
        state3->assignProperty(p3, "pos", QPointF(5, 5 + (64 + 5) + 64));
        state3->assignProperty(p4, "pos", QPointF(5 + 64 + 5, 5));
        state3->assignProperty(p5, "pos", QPointF(5 + 64 + 5, 5 + 64 + 5));
        state3->assignProperty(p6, "pos", QPointF(5 + 64 + 5, 5 + (64 + 5) + 64));
        state3->assignProperty(widget, "geometry", QRectF(138, 5, 400 - 138, 200));
        state3->assignProperty(box, "geometry", QRect(5, 205, 400, 90));
        state3->assignProperty(p1, "opacity", qreal(1));
        state3->assignProperty(p2, "opacity", qreal(1));
        state3->assignProperty(p3, "opacity", qreal(1));
        state3->assignProperty(p4, "opacity", qreal(1));
        state3->assignProperty(p5, "opacity", qreal(1));
        state3->assignProperty(p6, "opacity", qreal(1));

        QAbstractTransition *t1 = state1->addTransition(button, SIGNAL(clicked()), state2);
        QSequentialAnimationGroup *animation1SubGroup = new QSequentialAnimationGroup;
        animation1SubGroup->addPause(250);
        animation1SubGroup->addAnimation(new QPropertyAnimation(box, "geometry"));
        t1->addAnimation(animation1SubGroup);
        t1->addAnimation(new QPropertyAnimation(widget, "geometry"));
        t1->addAnimation(new QPropertyAnimation(p1, "pos"));
        t1->addAnimation(new QPropertyAnimation(p2, "pos"));
        t1->addAnimation(new QPropertyAnimation(p3, "pos"));
        t1->addAnimation(new QPropertyAnimation(p4, "pos"));
        t1->addAnimation(new QPropertyAnimation(p5, "pos"));
        t1->addAnimation(new QPropertyAnimation(p6, "pos"));
        t1->addAnimation(new QPropertyAnimation(p1, "rotation"));
        t1->addAnimation(new QPropertyAnimation(p2, "rotation"));
        t1->addAnimation(new QPropertyAnimation(p3, "rotation"));
        t1->addAnimation(new QPropertyAnimation(p4, "rotation"));
        t1->addAnimation(new QPropertyAnimation(p5, "rotation"));
        t1->addAnimation(new QPropertyAnimation(p6, "rotation"));
        t1->addAnimation(new QPropertyAnimation(p1, "opacity"));
        t1->addAnimation(new QPropertyAnimation(p2, "opacity"));
        t1->addAnimation(new QPropertyAnimation(p3, "opacity"));
        t1->addAnimation(new QPropertyAnimation(p4, "opacity"));
        t1->addAnimation(new QPropertyAnimation(p5, "opacity"));
        t1->addAnimation(new QPropertyAnimation(p6, "opacity"));

        QAbstractTransition *t2 = state2->addTransition(button, SIGNAL(clicked()), state3);
        t2->addAnimation(new QPropertyAnimation(box, "geometry"));
        t2->addAnimation(new QPropertyAnimation(widget, "geometry"));
        t2->addAnimation(new QPropertyAnimation(p1, "pos"));
        t2->addAnimation(new QPropertyAnimation(p2, "pos"));
        t2->addAnimation(new QPropertyAnimation(p3, "pos"));
        t2->addAnimation(new QPropertyAnimation(p4, "pos"));
        t2->addAnimation(new QPropertyAnimation(p5, "pos"));
        t2->addAnimation(new QPropertyAnimation(p6, "pos"));
        t2->addAnimation(new QPropertyAnimation(p1, "rotation"));
        t2->addAnimation(new QPropertyAnimation(p2, "rotation"));
        t2->addAnimation(new QPropertyAnimation(p3, "rotation"));
        t2->addAnimation(new QPropertyAnimation(p4, "rotation"));
        t2->addAnimation(new QPropertyAnimation(p5, "rotation"));
        t2->addAnimation(new QPropertyAnimation(p6, "rotation"));
        t2->addAnimation(new QPropertyAnimation(p1, "opacity"));
        t2->addAnimation(new QPropertyAnimation(p2, "opacity"));
        t2->addAnimation(new QPropertyAnimation(p3, "opacity"));
        t2->addAnimation(new QPropertyAnimation(p4, "opacity"));
        t2->addAnimation(new QPropertyAnimation(p5, "opacity"));
        t2->addAnimation(new QPropertyAnimation(p6, "opacity"));

        QAbstractTransition *t3 = state3->addTransition(button, SIGNAL(clicked()), state1);
        t3->addAnimation(new QPropertyAnimation(box, "geometry"));
        t3->addAnimation(new QPropertyAnimation(widget, "geometry"));
        t3->addAnimation(new QPropertyAnimation(p1, "pos"));
        t3->addAnimation(new QPropertyAnimation(p2, "pos"));
        t3->addAnimation(new QPropertyAnimation(p3, "pos"));
        t3->addAnimation(new QPropertyAnimation(p4, "pos"));
        t3->addAnimation(new QPropertyAnimation(p5, "pos"));
        t3->addAnimation(new QPropertyAnimation(p6, "pos"));
        t3->addAnimation(new QPropertyAnimation(p1, "rotation"));
        t3->addAnimation(new QPropertyAnimation(p2, "rotation"));
        t3->addAnimation(new QPropertyAnimation(p3, "rotation"));
        t3->addAnimation(new QPropertyAnimation(p4, "rotation"));
        t3->addAnimation(new QPropertyAnimation(p5, "rotation"));
        t3->addAnimation(new QPropertyAnimation(p6, "rotation"));
        t3->addAnimation(new QPropertyAnimation(p1, "opacity"));
        t3->addAnimation(new QPropertyAnimation(p2, "opacity"));
        t3->addAnimation(new QPropertyAnimation(p3, "opacity"));
        t3->addAnimation(new QPropertyAnimation(p4, "opacity"));
        t3->addAnimation(new QPropertyAnimation(p5, "opacity"));
        t3->addAnimation(new QPropertyAnimation(p6, "opacity"));

        machine.start();

        GraphicsView view(&scene);

        view.show();

        return app.exec();
    }

    #include "main.moc"