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50
51#include "shapedclock.h"
52
53#include <QAction>
54#include <QCoreApplication>
55#include <QMouseEvent>
56#include <QPainter>
57#include <QTime>
58#include <QTimer>
59
60//! [0]
61ShapedClock::ShapedClock(QWidget *parent)
62 : QWidget(parent, Qt::FramelessWindowHint | Qt::WindowSystemMenuHint)
63{
64 setAttribute(Qt::WA_TranslucentBackground);
65 QTimer *timer = new QTimer(this);
66 connect(sender: timer, signal: &QTimer::timeout, receiver: this, slot: QOverload<>::of(ptr: &ShapedClock::update));
67 timer->start(msec: 1000);
68
69 QAction *quitAction = new QAction(tr(s: "E&xit"), this);
70 quitAction->setShortcut(tr(s: "Ctrl+Q"));
71 connect(sender: quitAction, signal: &QAction::triggered, qApp, slot: &QCoreApplication::quit);
72 addAction(action: quitAction);
73
74 setContextMenuPolicy(Qt::ActionsContextMenu);
75 setToolTip(tr(s: "Drag the clock with the left mouse button.\n"
76 "Use the right mouse button to open a context menu."));
77 setWindowTitle(tr(s: "Shaped Analog Clock"));
78}
79//! [0]
80
81//! [1]
82void ShapedClock::mousePressEvent(QMouseEvent *event)
83{
84 if (event->button() == Qt::LeftButton) {
85 dragPosition = event->globalPos() - frameGeometry().topLeft();
86 event->accept();
87 }
88}
89//! [1]
90
91//! [2]
92void ShapedClock::mouseMoveEvent(QMouseEvent *event)
93{
94 if (event->buttons() & Qt::LeftButton) {
95 move(event->globalPos() - dragPosition);
96 event->accept();
97 }
98}
99//! [2]
100
101//! [3]
102void ShapedClock::paintEvent(QPaintEvent *)
103{
104 static const QPoint hourHand[3] = {
105 QPoint(7, 8),
106 QPoint(-7, 8),
107 QPoint(0, -40)
108 };
109 static const QPoint minuteHand[3] = {
110 QPoint(7, 8),
111 QPoint(-7, 8),
112 QPoint(0, -70)
113 };
114
115 QColor hourColor(127, 0, 127);
116 QColor minuteColor(0, 127, 127, 191);
117
118 int side = qMin(a: width(), b: height());
119 QTime time = QTime::currentTime();
120
121 QPainter painter(this);
122 painter.setRenderHint(hint: QPainter::Antialiasing);
123 painter.translate(dx: width() / 2, dy: height() / 2);
124 painter.scale(sx: side / 200.0, sy: side / 200.0);
125
126 painter.setPen(Qt::NoPen);
127 painter.setBrush(palette().window());
128 painter.drawEllipse(center: QPoint(0, 0), rx: 98, ry: 98);
129
130 painter.setPen(Qt::NoPen);
131 painter.setBrush(hourColor);
132
133 painter.save();
134 painter.rotate(a: 30.0 * ((time.hour() + time.minute() / 60.0)));
135 painter.drawConvexPolygon(points: hourHand, pointCount: 3);
136 painter.restore();
137
138 painter.setPen(hourColor);
139
140 for (int i = 0; i < 12; ++i) {
141 painter.drawLine(x1: 88, y1: 0, x2: 96, y2: 0);
142 painter.rotate(a: 30.0);
143 }
144
145 painter.setPen(Qt::NoPen);
146 painter.setBrush(minuteColor);
147
148 painter.save();
149 painter.rotate(a: 6.0 * (time.minute() + time.second() / 60.0));
150 painter.drawConvexPolygon(points: minuteHand, pointCount: 3);
151 painter.restore();
152
153 painter.setPen(minuteColor);
154
155 for (int j = 0; j < 60; ++j) {
156 if ((j % 5) != 0)
157 painter.drawLine(x1: 92, y1: 0, x2: 96, y2: 0);
158 painter.rotate(a: 6.0);
159 }
160}
161//! [3]
162
163//! [4]
164void ShapedClock::resizeEvent(QResizeEvent * /* event */)
165{
166 int side = qMin(a: width(), b: height());
167 QRegion maskedRegion(width() / 2 - side / 2, height() / 2 - side / 2, side,
168 side, QRegion::Ellipse);
169 setMask(maskedRegion);
170}
171//! [4]
172
173//! [5]
174QSize ShapedClock::sizeHint() const
175{
176 return QSize(200, 200);
177}
178//! [5]
179

source code of qtbase/examples/widgets/widgets/shapedclock/shapedclock.cpp