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50
51#include "spinner.h"
52
53#include <QtQuick/QQuickWindow>
54#include <QtGui/QScreen>
55#include <QtQuick/QSGSimpleTextureNode>
56
57#include <QtGui/QConicalGradient>
58#include <QtGui/QPainter>
59
60class SpinnerNode : public QObject, public QSGTransformNode
61{
62 Q_OBJECT
63public:
64 SpinnerNode(QQuickWindow *window)
65 : m_rotation(0)
66 , m_spinning(false)
67 , m_window(window)
68 {
69 connect(sender: window, signal: &QQuickWindow::beforeRendering, receiver: this, slot: &SpinnerNode::maybeRotate, type: Qt::DirectConnection);
70 connect(sender: window, signal: &QQuickWindow::frameSwapped, receiver: this, slot: &SpinnerNode::maybeUpdate, type: Qt::DirectConnection);
71
72 QImage image(":/scenegraph/threadedanimation/spinner.png");
73 m_texture = window->createTextureFromImage(image);
74 QSGSimpleTextureNode *textureNode = new QSGSimpleTextureNode();
75 textureNode->setTexture(m_texture);
76 textureNode->setRect(x: 0, y: 0, w: image.width(), h: image.height());
77 textureNode->setFiltering(QSGTexture::Linear);
78 appendChildNode(node: textureNode);
79 }
80
81 ~SpinnerNode() override {
82 delete m_texture;
83 }
84
85 void setSpinning(bool spinning)
86 {
87 m_spinning = spinning;
88 }
89
90public slots:
91 void maybeRotate() {
92 if (m_spinning) {
93 m_rotation += (360 / m_window->screen()->refreshRate());
94 QMatrix4x4 matrix;
95 matrix.translate(x: 32, y: 32);
96 matrix.rotate(angle: m_rotation, x: 0, y: 0, z: 1);
97 matrix.translate(x: -32, y: -32);
98 setMatrix(matrix);
99
100 // If we're inside a QQuickWidget, this call is necessary to ensure the widget gets updated.
101 m_window->update();
102 }
103 }
104
105 void maybeUpdate() {
106 if (m_spinning) {
107 m_window->update();
108 }
109 }
110
111private:
112 qreal m_rotation;
113 bool m_spinning;
114 QSGTexture *m_texture;
115 QQuickWindow *m_window;
116};
117
118Spinner::Spinner()
119 : m_spinning(false)
120{
121 setSize(QSize(64, 64));
122 setFlag(flag: ItemHasContents);
123}
124
125void Spinner::setSpinning(bool spinning)
126{
127 if (spinning == m_spinning)
128 return;
129 m_spinning = spinning;
130 emit spinningChanged();
131 update();
132}
133
134QSGNode *Spinner::updatePaintNode(QSGNode *old, UpdatePaintNodeData *)
135{
136 SpinnerNode *n = static_cast<SpinnerNode *>(old);
137 if (!n)
138 n = new SpinnerNode(window());
139
140 n->setSpinning(m_spinning);
141
142 return n;
143}
144
145#include "spinner.moc"
146

source code of qtdeclarative/examples/quick/scenegraph/threadedanimation/spinner.cpp