| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the QtCore module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:BSD$ |
| ** Commercial License Usage |
| ** Licensees holding valid commercial Qt licenses may use this file in |
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| ** |
| ** BSD License Usage |
| ** Alternatively, 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: |
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| ** from this software without specific prior written permission. |
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| ** |
| ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #include <QtCore> |
| #include <QtWidgets> |
| |
| //![15] |
| class StateSwitchEvent: public QEvent |
| { |
| public: |
| StateSwitchEvent() |
| : QEvent(Type(StateSwitchType)) |
| { |
| } |
| |
| explicit StateSwitchEvent(int rand) |
| : QEvent(Type(StateSwitchType)), |
| m_rand(rand) |
| { |
| } |
| |
| enum { StateSwitchType = QEvent::User + 256 }; |
| |
| int rand() const { return m_rand; } |
| |
| private: |
| int m_rand; |
| }; |
| //![15] |
| |
| //![16] |
| class QGraphicsRectWidget : public QGraphicsWidget |
| { |
| public: |
| void paint(QPainter *painter, const QStyleOptionGraphicsItem *, |
| QWidget *) override |
| { |
| painter->fillRect(rect(), Qt::blue); |
| } |
| }; |
| //![16] |
| |
| class StateSwitchTransition: public QAbstractTransition |
| { |
| public: |
| StateSwitchTransition(int rand) |
| : QAbstractTransition(), |
| m_rand(rand) |
| { |
| } |
| |
| protected: |
| //![14] |
| bool eventTest(QEvent *event) override |
| { |
| return (event->type() == QEvent::Type(StateSwitchEvent::StateSwitchType)) |
| && (static_cast<StateSwitchEvent *>(event)->rand() == m_rand); |
| } |
| //![14] |
| |
| void onTransition(QEvent *) override {} |
| |
| private: |
| int m_rand; |
| }; |
| |
| //![10] |
| class StateSwitcher : public QState |
| { |
| Q_OBJECT |
| public: |
| StateSwitcher(QStateMachine *machine) |
| : QState(machine), m_stateCount(0), m_lastIndex(0) |
| { } |
| //![10] |
| |
| //![11] |
| void onEntry(QEvent *) override |
| { |
| int n; |
| while ((n = QRandomGenerator::global()->bounded(m_stateCount) + 1) == m_lastIndex) |
| { } |
| m_lastIndex = n; |
| machine()->postEvent(new StateSwitchEvent(n)); |
| } |
| void onExit(QEvent *) override {} |
| //![11] |
| |
| //![12] |
| void addState(QState *state, QAbstractAnimation *animation) { |
| StateSwitchTransition *trans = new StateSwitchTransition(++m_stateCount); |
| trans->setTargetState(state); |
| addTransition(trans); |
| trans->addAnimation(animation); |
| } |
| //![12] |
| |
| private: |
| int m_stateCount; |
| int m_lastIndex; |
| }; |
| |
| //![13] |
| 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; |
| } |
| //![13] |
| |
| |
| class GraphicsView : public QGraphicsView |
| { |
| Q_OBJECT |
| public: |
| GraphicsView(QGraphicsScene *scene, QWidget *parent = nullptr) |
| : QGraphicsView(scene, parent) |
| { |
| } |
| |
| protected: |
| void resizeEvent(QResizeEvent *event) override |
| { |
| fitInView(scene()->sceneRect()); |
| QGraphicsView::resizeEvent(event); |
| } |
| }; |
| |
| |
| int main(int argc, char **argv) |
| { |
| QApplication app(argc, argv); |
| |
| //![1] |
| 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); |
| //![1] |
| GraphicsView window(&scene); |
| window.setFrameStyle(0); |
| window.setAlignment(Qt::AlignLeft | Qt::AlignTop); |
| window.setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff); |
| window.setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff); |
| //![2] |
| QStateMachine machine; |
| |
| QState *group = new QState(); |
| group->setObjectName("group"); |
| QTimer timer; |
| timer.setInterval(1250); |
| timer.setSingleShot(true); |
| QObject::connect(group, &QState::entered, &timer, QOverload<>::of(&QTimer::start)); |
| //![2] |
| |
| //![3] |
| 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); |
| //![3] |
| 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); |
| //![4] |
| 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); |
| //![4] |
| |
| //![5] |
| QParallelAnimationGroup animationGroup; |
| QSequentialAnimationGroup *subGroup; |
| |
| QPropertyAnimation *anim = new QPropertyAnimation(button4, "geometry"); |
| anim->setDuration(1000); |
| anim->setEasingCurve(QEasingCurve::OutElastic); |
| animationGroup.addAnimation(anim); |
| //![5] |
| |
| //![6] |
| subGroup = new QSequentialAnimationGroup(&animationGroup); |
| subGroup->addPause(100); |
| anim = new QPropertyAnimation(button3, "geometry"); |
| anim->setDuration(1000); |
| anim->setEasingCurve(QEasingCurve::OutElastic); |
| subGroup->addAnimation(anim); |
| //![6] |
| |
| 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); |
| |
| //![7] |
| StateSwitcher *stateSwitcher = new StateSwitcher(&machine); |
| stateSwitcher->setObjectName("stateSwitcher"); |
| group->addTransition(&timer, &QTimer::timeout, stateSwitcher); |
| stateSwitcher->addState(state1, &animationGroup); |
| stateSwitcher->addState(state2, &animationGroup); |
| //![7] |
| stateSwitcher->addState(state3, &animationGroup); |
| stateSwitcher->addState(state4, &animationGroup); |
| stateSwitcher->addState(state5, &animationGroup); |
| stateSwitcher->addState(state6, &animationGroup); |
| //![8] |
| stateSwitcher->addState(state7, &animationGroup); |
| //![8] |
| |
| //![9] |
| machine.addState(group); |
| machine.setInitialState(group); |
| machine.start(); |
| //![9] |
| |
| window.resize(300, 300); |
| window.show(); |
| |
| return app.exec(); |
| } |
| |
| #include "main.moc" |