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6 | ** This file is part of the QtCore module of the Qt Toolkit. |
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8 | ** $QT_BEGIN_LICENSE:BSD$ |
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47 | ** $QT_END_LICENSE$ |
48 | ** |
49 | ****************************************************************************/ |
50 | |
51 | #include <QApplication> |
52 | #include <QFinalState> |
53 | #include <QPainter> |
54 | #include <QStateMachine> |
55 | #include <QTimer> |
56 | #include <QVBoxLayout> |
57 | #include <QWidget> |
58 | |
59 | //! [0] |
60 | class LightWidget : public QWidget |
61 | { |
62 | Q_OBJECT |
63 | Q_PROPERTY(bool on READ isOn WRITE setOn) |
64 | public: |
65 | LightWidget(const QColor &color, QWidget *parent = nullptr) |
66 | : QWidget(parent), m_color(color), m_on(false) {} |
67 | |
68 | bool isOn() const |
69 | { return m_on; } |
70 | void setOn(bool on) |
71 | { |
72 | if (on == m_on) |
73 | return; |
74 | m_on = on; |
75 | update(); |
76 | } |
77 | |
78 | public slots: |
79 | void turnOff() { setOn(false); } |
80 | void turnOn() { setOn(true); } |
81 | |
82 | protected: |
83 | void paintEvent(QPaintEvent *) override |
84 | { |
85 | if (!m_on) |
86 | return; |
87 | QPainter painter(this); |
88 | painter.setRenderHint(hint: QPainter::Antialiasing); |
89 | painter.setBrush(m_color); |
90 | painter.drawEllipse(x: 0, y: 0, w: width(), h: height()); |
91 | } |
92 | |
93 | private: |
94 | QColor m_color; |
95 | bool m_on; |
96 | }; |
97 | //! [0] |
98 | |
99 | //! [1] |
100 | class TrafficLightWidget : public QWidget |
101 | { |
102 | public: |
103 | TrafficLightWidget(QWidget *parent = nullptr) |
104 | : QWidget(parent) |
105 | { |
106 | QVBoxLayout *vbox = new QVBoxLayout(this); |
107 | m_red = new LightWidget(Qt::red); |
108 | vbox->addWidget(m_red); |
109 | m_yellow = new LightWidget(Qt::yellow); |
110 | vbox->addWidget(m_yellow); |
111 | m_green = new LightWidget(Qt::green); |
112 | vbox->addWidget(m_green); |
113 | QPalette pal = palette(); |
114 | pal.setColor(acr: QPalette::Window, acolor: Qt::black); |
115 | setPalette(pal); |
116 | setAutoFillBackground(true); |
117 | } |
118 | |
119 | LightWidget *redLight() const |
120 | { return m_red; } |
121 | LightWidget *yellowLight() const |
122 | { return m_yellow; } |
123 | LightWidget *greenLight() const |
124 | { return m_green; } |
125 | |
126 | private: |
127 | LightWidget *m_red; |
128 | LightWidget *m_yellow; |
129 | LightWidget *m_green; |
130 | }; |
131 | //! [1] |
132 | |
133 | //! [2] |
134 | QState *createLightState(LightWidget *light, int duration, QState *parent = nullptr) |
135 | { |
136 | QState *lightState = new QState(parent); |
137 | QTimer *timer = new QTimer(lightState); |
138 | timer->setInterval(duration); |
139 | timer->setSingleShot(true); |
140 | QState *timing = new QState(lightState); |
141 | QObject::connect(sender: timing, signal: &QAbstractState::entered, receiver: light, slot: &LightWidget::turnOn); |
142 | QObject::connect(sender: timing, signal: &QAbstractState::entered, receiver: timer, slot: QOverload<>::of(ptr: &QTimer::start)); |
143 | QObject::connect(sender: timing, signal: &QAbstractState::exited, receiver: light, slot: &LightWidget::turnOff); |
144 | QFinalState *done = new QFinalState(lightState); |
145 | timing->addTransition(obj: timer, signal: &QTimer::timeout, target: done); |
146 | lightState->setInitialState(timing); |
147 | return lightState; |
148 | } |
149 | //! [2] |
150 | |
151 | //! [3] |
152 | class TrafficLight : public QWidget |
153 | { |
154 | public: |
155 | TrafficLight(QWidget *parent = nullptr) |
156 | : QWidget(parent) |
157 | { |
158 | QVBoxLayout *vbox = new QVBoxLayout(this); |
159 | TrafficLightWidget *widget = new TrafficLightWidget; |
160 | vbox->addWidget(widget); |
161 | vbox->setContentsMargins(QMargins()); |
162 | |
163 | QStateMachine *machine = new QStateMachine(this); |
164 | QState *redGoingYellow = createLightState(light: widget->redLight(), duration: 3000); |
165 | redGoingYellow->setObjectName("redGoingYellow" ); |
166 | QState *yellowGoingGreen = createLightState(light: widget->yellowLight(), duration: 1000); |
167 | yellowGoingGreen->setObjectName("yellowGoingGreen" ); |
168 | redGoingYellow->addTransition(obj: redGoingYellow, signal: &QState::finished, target: yellowGoingGreen); |
169 | QState *greenGoingYellow = createLightState(light: widget->greenLight(), duration: 3000); |
170 | greenGoingYellow->setObjectName("greenGoingYellow" ); |
171 | yellowGoingGreen->addTransition(obj: yellowGoingGreen, signal: &QState::finished, target: greenGoingYellow); |
172 | QState *yellowGoingRed = createLightState(light: widget->yellowLight(), duration: 1000); |
173 | yellowGoingRed->setObjectName("yellowGoingRed" ); |
174 | greenGoingYellow->addTransition(obj: greenGoingYellow, signal: &QState::finished, target: yellowGoingRed); |
175 | yellowGoingRed->addTransition(obj: yellowGoingRed, signal: &QState::finished, target: redGoingYellow); |
176 | |
177 | machine->addState(state: redGoingYellow); |
178 | machine->addState(state: yellowGoingGreen); |
179 | machine->addState(state: greenGoingYellow); |
180 | machine->addState(state: yellowGoingRed); |
181 | machine->setInitialState(redGoingYellow); |
182 | machine->start(); |
183 | } |
184 | }; |
185 | //! [3] |
186 | |
187 | //! [4] |
188 | int main(int argc, char **argv) |
189 | { |
190 | QApplication app(argc, argv); |
191 | |
192 | TrafficLight widget; |
193 | widget.resize(w: 110, h: 300); |
194 | widget.show(); |
195 | |
196 | return app.exec(); |
197 | } |
198 | //! [4] |
199 | |
200 | #include "main.moc" |
201 | |