Qt 5.9 | Qt Widgets | States Example | main.cpp Example File

Qt 5.9.9 Reference Documentation

# main.cpp Example File

animation/states/main.cpp

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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 *) override
          {
              painter->drawPixmap(QPointF(), p);
          }

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

      private:
          QPixmap p;
      };

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

          void resizeEvent(QResizeEvent *) 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"