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50
51#include "blurpicker.h"
52
53#include <QtWidgets>
54#include <QtCore/qmath.h>
55#include <qmath.h>
56#include "blureffect.h"
57
58BlurPicker::BlurPicker(QWidget *parent): QGraphicsView(parent), m_index(0.0), m_animation(this, "index")
59{
60 setBackgroundBrush(QPixmap(":/images/background.jpg"));
61 setScene(new QGraphicsScene(this));
62
63 setupScene();
64 setIndex(0);
65
66 m_animation.setDuration(400);
67 m_animation.setEasingCurve(QEasingCurve::InOutSine);
68
69 setRenderHint(hint: QPainter::Antialiasing, enabled: true);
70 setFrameStyle(QFrame::NoFrame);
71}
72
73qreal BlurPicker::index() const
74{
75 return m_index;
76}
77
78void BlurPicker::setIndex(qreal index)
79{
80 m_index = index;
81
82 qreal baseline = 0;
83 const qreal iconAngle = 2 * M_PI / m_icons.count();
84 for (int i = 0; i < m_icons.count(); ++i) {
85 QGraphicsItem *icon = m_icons[i];
86 qreal a = (i + m_index) * iconAngle;
87 qreal xs = 170 * qSin(v: a);
88 qreal ys = 100 * qCos(v: a);
89 QPointF pos(xs, ys);
90 pos = QTransform().rotate(a: -20).map(p: pos);
91 pos -= QPointF(40, 40);
92 icon->setPos(pos);
93 baseline = qMax(a: baseline, b: ys);
94 static_cast<BlurEffect *>(icon->graphicsEffect())->setBaseLine(baseline);
95 }
96
97 scene()->update();
98}
99
100void BlurPicker::setupScene()
101{
102 scene()->setSceneRect(x: -200, y: -120, w: 400, h: 240);
103
104 QStringList names;
105 names << ":/images/accessories-calculator.png";
106 names << ":/images/accessories-text-editor.png";
107 names << ":/images/help-browser.png";
108 names << ":/images/internet-group-chat.png";
109 names << ":/images/internet-mail.png";
110 names << ":/images/internet-web-browser.png";
111 names << ":/images/office-calendar.png";
112 names << ":/images/system-users.png";
113
114 for (int i = 0; i < names.count(); i++) {
115 QPixmap pixmap(names[i]);
116 QGraphicsPixmapItem *icon = scene()->addPixmap(pixmap);
117 icon->setZValue(1);
118 icon->setGraphicsEffect(new BlurEffect(icon));
119 m_icons << icon;
120 }
121
122 QGraphicsPixmapItem *bg = scene()->addPixmap(pixmap: QPixmap(":/images/background.jpg"));
123 bg->setZValue(0);
124 bg->setPos(ax: -200, ay: -150);
125}
126
127void BlurPicker::keyPressEvent(QKeyEvent *event)
128{
129 int delta = 0;
130 switch (event->key())
131 {
132 case Qt::Key_Left:
133 delta = -1;
134 break;
135 case Qt::Key_Right:
136 delta = 1;
137 break;
138 default:
139 break;
140 }
141 if (m_animation.state() == QAbstractAnimation::Stopped && delta) {
142 m_animation.setEndValue(m_index + delta);
143 m_animation.start();
144 event->accept();
145 }
146}
147
148void BlurPicker::resizeEvent(QResizeEvent * /* event */)
149{
150}
151
152void BlurPicker::mousePressEvent(QMouseEvent *event)
153{
154 int delta = 0;
155 if(event->x() > (width() / 2))
156 {
157 delta = 1;
158 }
159 else
160 {
161 delta = -1;
162 }
163
164 if (m_animation.state() == QAbstractAnimation::Stopped && delta) {
165 m_animation.setEndValue(m_index + delta);
166 m_animation.start();
167 event->accept();
168 }
169}
170

source code of qtbase/examples/widgets/effects/blurpicker/blurpicker.cpp