#include <QtCore>
#include <QtGui>
class StateSwitchEvent: public QEvent
{
public:
StateSwitchEvent()
: QEvent(Type(StateSwitchType))
{
}
StateSwitchEvent(int rand)
: QEvent(Type(StateSwitchType)),
m_rand(rand)
{
}
enum { StateSwitchType = QEvent::User + 256 };
int rand() const { return m_rand; }
private:
int m_rand;
};
class QGraphicsRectWidget : public QGraphicsWidget
{
public:
void paint(QPainter *painter, const QStyleOptionGraphicsItem *,
QWidget *)
{
painter->fillRect(rect(), Qt::blue);
}
};
class StateSwitchTransition: public QAbstractTransition
{
public:
StateSwitchTransition(int rand)
: QAbstractTransition(),
m_rand(rand)
{
}
protected:
virtual bool eventTest(QEvent *event)
{
return (event->type() == QEvent::Type(StateSwitchEvent::StateSwitchType))
&& (static_cast<StateSwitchEvent *>(event)->rand() == m_rand);
}
virtual void onTransition(QEvent *) {}
private:
int m_rand;
};
class StateSwitcher : public QState
{
Q_OBJECT
public:
StateSwitcher(QStateMachine *machine)
: QState(machine), m_stateCount(0), m_lastIndex(0)
{ }
virtual void onEntry(QEvent *)
{
int n;
while ((n = (qrand() % m_stateCount + 1)) == m_lastIndex)
{ }
m_lastIndex = n;
machine()->postEvent(new StateSwitchEvent(n));
}
virtual void onExit(QEvent *) {}
void addState(QState *state, QAbstractAnimation *animation) {
StateSwitchTransition *trans = new StateSwitchTransition(++m_stateCount);
trans->setTargetState(state);
addTransition(trans);
trans->addAnimation(animation);
}
private:
int m_stateCount;
int m_lastIndex;
};
QState *createGeometryState(QObject *w1, const QRect &rect1,
QObject *w2, const QRect &rect2,
QObject *w3, const QRect &rect3,
QObject *w4, const QRect &rect4,
QState *parent)
{
QState *result = new QState(parent);
result->assignProperty(w1, "geometry", rect1);
result->assignProperty(w2, "geometry", rect2);
result->assignProperty(w3, "geometry", rect3);
result->assignProperty(w4, "geometry", rect4);
return result;
}
int main(int argc, char **argv)
{
QApplication app(argc, argv);
#if 0
QWidget window;
QPalette palette;
palette.setBrush(QPalette::Window, Qt::black);
window.setPalette(palette);
QPushButton *button1 = new QPushButton("A", &window);
QPushButton *button2 = new QPushButton("B", &window);
QPushButton *button3 = new QPushButton("C", &window);
QPushButton *button4 = new QPushButton("D", &window);
button1->setObjectName("button1");
button2->setObjectName("button2");
button3->setObjectName("button3");
button4->setObjectName("button4");
#else
QGraphicsRectWidget *button1 = new QGraphicsRectWidget;
QGraphicsRectWidget *button2 = new QGraphicsRectWidget;
QGraphicsRectWidget *button3 = new QGraphicsRectWidget;
QGraphicsRectWidget *button4 = new QGraphicsRectWidget;
button2->setZValue(1);
button3->setZValue(2);
button4->setZValue(3);
QGraphicsScene scene(0, 0, 300, 300);
scene.setBackgroundBrush(Qt::black);
scene.addItem(button1);
scene.addItem(button2);
scene.addItem(button3);
scene.addItem(button4);
QGraphicsView window(&scene);
window.setFrameStyle(0);
window.setAlignment(Qt::AlignLeft | Qt::AlignTop);
window.setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
window.setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
#endif
QStateMachine machine;
QState *group = new QState();
group->setObjectName("group");
QTimer timer;
timer.setInterval(1250);
timer.setSingleShot(true);
QObject::connect(group, SIGNAL(entered()), &timer, SLOT(start()));
QState *state1;
QState *state2;
QState *state3;
QState *state4;
QState *state5;
QState *state6;
QState *state7;
state1 = createGeometryState(button1, QRect(100, 0, 50, 50),
button2, QRect(150, 0, 50, 50),
button3, QRect(200, 0, 50, 50),
button4, QRect(250, 0, 50, 50),
group);
state2 = createGeometryState(button1, QRect(250, 100, 50, 50),
button2, QRect(250, 150, 50, 50),
button3, QRect(250, 200, 50, 50),
button4, QRect(250, 250, 50, 50),
group);
state3 = createGeometryState(button1, QRect(150, 250, 50, 50),
button2, QRect(100, 250, 50, 50),
button3, QRect(50, 250, 50, 50),
button4, QRect(0, 250, 50, 50),
group);
state4 = createGeometryState(button1, QRect(0, 150, 50, 50),
button2, QRect(0, 100, 50, 50),
button3, QRect(0, 50, 50, 50),
button4, QRect(0, 0, 50, 50),
group);
state5 = createGeometryState(button1, QRect(100, 100, 50, 50),
button2, QRect(150, 100, 50, 50),
button3, QRect(100, 150, 50, 50),
button4, QRect(150, 150, 50, 50),
group);
state6 = createGeometryState(button1, QRect(50, 50, 50, 50),
button2, QRect(200, 50, 50, 50),
button3, QRect(50, 200, 50, 50),
button4, QRect(200, 200, 50, 50),
group);
state7 = createGeometryState(button1, QRect(0, 0, 50, 50),
button2, QRect(250, 0, 50, 50),
button3, QRect(0, 250, 50, 50),
button4, QRect(250, 250, 50, 50),
group);
group->setInitialState(state1);
QParallelAnimationGroup animationGroup;
QSequentialAnimationGroup *subGroup;
QPropertyAnimation *anim = new QPropertyAnimation(button4, "geometry");
anim->setDuration(1000);
anim->setEasingCurve(QEasingCurve::OutElastic);
animationGroup.addAnimation(anim);
subGroup = new QSequentialAnimationGroup(&animationGroup);
subGroup->addPause(100);
anim = new QPropertyAnimation(button3, "geometry");
anim->setDuration(1000);
anim->setEasingCurve(QEasingCurve::OutElastic);
subGroup->addAnimation(anim);
subGroup = new QSequentialAnimationGroup(&animationGroup);
subGroup->addPause(150);
anim = new QPropertyAnimation(button2, "geometry");
anim->setDuration(1000);
anim->setEasingCurve(QEasingCurve::OutElastic);
subGroup->addAnimation(anim);
subGroup = new QSequentialAnimationGroup(&animationGroup);
subGroup->addPause(200);
anim = new QPropertyAnimation(button1, "geometry");
anim->setDuration(1000);
anim->setEasingCurve(QEasingCurve::OutElastic);
subGroup->addAnimation(anim);
StateSwitcher *stateSwitcher = new StateSwitcher(&machine);
stateSwitcher->setObjectName("stateSwitcher");
group->addTransition(&timer, SIGNAL(timeout()), stateSwitcher);
stateSwitcher->addState(state1, &animationGroup);
stateSwitcher->addState(state2, &animationGroup);
stateSwitcher->addState(state3, &animationGroup);
stateSwitcher->addState(state4, &animationGroup);
stateSwitcher->addState(state5, &animationGroup);
stateSwitcher->addState(state6, &animationGroup);
stateSwitcher->addState(state7, &animationGroup);
machine.addState(group);
machine.setInitialState(group);
machine.start();
window.resize(300, 300);
window.show();
qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
return app.exec();
}
#include "main.moc"
