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36
37#include "qquickmaterialbusyindicator_p.h"
38
39#include <QtCore/qmath.h>
40#include <QtCore/qeasingcurve.h>
41#include <QtGui/qpainter.h>
42#include <QtQuick/qsgimagenode.h>
43#include <QtQuick/qquickwindow.h>
44#include <QtQuickControls2/private/qquickanimatednode_p.h>
45
46QT_BEGIN_NAMESPACE
47
48/*
49 Relevant Android code:
50
51 - core/res/res/anim/progress_indeterminate_rotation_material.xml contains
52 the rotation animation data.
53 - core/res/res/anim/progress_indeterminate_material.xml contains the trim
54 animation data.
55 - core/res/res/interpolator/trim_start_interpolator.xml and
56 core/res/res/interpolator/trim_end_interpolator.xml contain the start
57 and end trim path interpolators.
58 - addCommand() in core/java/android/util/PathParser.java has a list of the
59 different path commands available.
60*/
61
62static const int SpanAnimationDuration = 700;
63static const int RotationAnimationDuration = SpanAnimationDuration * 6;
64static const int TargetRotation = 720;
65static const int OneDegree = 16;
66static const qreal MinSweepSpan = 10 * OneDegree;
67static const qreal MaxSweepSpan = 300 * OneDegree;
68
69class QQuickMaterialBusyIndicatorNode : public QQuickAnimatedNode
70{
71public:
72 QQuickMaterialBusyIndicatorNode(QQuickMaterialBusyIndicator *item);
73
74 void sync(QQuickItem *item) override;
75
76protected:
77 void updateCurrentTime(int time) override;
78
79private:
80 int m_lastStartAngle = 0;
81 int m_lastEndAngle = 0;
82 qreal m_width = 0;
83 qreal m_height = 0;
84 qreal m_devicePixelRatio = 1;
85 QColor m_color;
86};
87
88QQuickMaterialBusyIndicatorNode::QQuickMaterialBusyIndicatorNode(QQuickMaterialBusyIndicator *item)
89 : QQuickAnimatedNode(item)
90{
91 setLoopCount(Infinite);
92 setCurrentTime(item->elapsed());
93 setDuration(RotationAnimationDuration);
94
95 QSGImageNode *textureNode = item->window()->createImageNode();
96 textureNode->setOwnsTexture(true);
97 appendChildNode(node: textureNode);
98
99 // A texture seems to be required here, but we don't have one yet, as we haven't drawn anything,
100 // so just use a blank image.
101 QImage blankImage(item->width(), item->height(), QImage::Format_ARGB32_Premultiplied);
102 blankImage.fill(color: Qt::transparent);
103 textureNode->setTexture(item->window()->createTextureFromImage(image: blankImage));
104}
105
106void QQuickMaterialBusyIndicatorNode::updateCurrentTime(int time)
107{
108 const qreal w = m_width;
109 const qreal h = m_height;
110 const qreal size = qMin(a: w, b: h);
111 const qreal dx = (w - size) / 2;
112 const qreal dy = (h - size) / 2;
113
114 QImage image(size * m_devicePixelRatio, size * m_devicePixelRatio, QImage::Format_ARGB32_Premultiplied);
115 image.fill(color: Qt::transparent);
116
117 QPainter painter(&image);
118 painter.setRenderHint(hint: QPainter::Antialiasing);
119
120 QPen pen;
121 QSGImageNode *textureNode = static_cast<QSGImageNode *>(firstChild());
122 pen.setColor(m_color);
123 pen.setWidth(qCeil(v: size / 12) * m_devicePixelRatio);
124 painter.setPen(pen);
125
126 const qreal percentageComplete = time / qreal(RotationAnimationDuration);
127 const qreal spanPercentageComplete = (time % SpanAnimationDuration) / qreal(SpanAnimationDuration);
128 const int iteration = time / SpanAnimationDuration;
129 int startAngle = 0;
130 int endAngle = 0;
131
132 if (iteration % 2 == 0) {
133 if (m_lastStartAngle > 360 * OneDegree)
134 m_lastStartAngle -= 360 * OneDegree;
135
136 // The start angle is only affected by the rotation animation for the "grow" phase.
137 startAngle = m_lastStartAngle;
138 QEasingCurve angleCurve(QEasingCurve::OutQuad);
139 const qreal percentage = angleCurve.valueForProgress(progress: spanPercentageComplete);
140 endAngle = m_lastStartAngle + MinSweepSpan + percentage * (MaxSweepSpan - MinSweepSpan);
141 m_lastEndAngle = endAngle;
142 } else {
143 // Both the start angle *and* the span are affected by the "shrink" phase.
144 QEasingCurve angleCurve(QEasingCurve::InQuad);
145 const qreal percentage = angleCurve.valueForProgress(progress: spanPercentageComplete);
146 startAngle = m_lastEndAngle - MaxSweepSpan + percentage * (MaxSweepSpan - MinSweepSpan);
147 endAngle = m_lastEndAngle;
148 m_lastStartAngle = startAngle;
149 }
150
151 const int halfPen = pen.width() / 2;
152 const QRectF arcBounds = QRectF(halfPen, halfPen,
153 m_devicePixelRatio * size - pen.width(),
154 m_devicePixelRatio * size - pen.width());
155 // The current angle of the rotation animation.
156 const qreal rotation = OneDegree * percentageComplete * -TargetRotation;
157 startAngle -= rotation;
158 endAngle -= rotation;
159 const int angleSpan = endAngle - startAngle;
160 painter.drawArc(rect: arcBounds, a: -startAngle, alen: -angleSpan);
161 painter.end();
162
163 textureNode->setRect(QRectF(dx, dy, size, size));
164 textureNode->setTexture(window()->createTextureFromImage(image));
165}
166
167void QQuickMaterialBusyIndicatorNode::sync(QQuickItem *item)
168{
169 QQuickMaterialBusyIndicator *indicator = static_cast<QQuickMaterialBusyIndicator *>(item);
170 m_color = indicator->color();
171 m_width = indicator->width();
172 m_height = indicator->height();
173 m_devicePixelRatio = indicator->window()->effectiveDevicePixelRatio();
174}
175
176QQuickMaterialBusyIndicator::QQuickMaterialBusyIndicator(QQuickItem *parent) :
177 QQuickItem(parent)
178{
179 setFlag(flag: ItemHasContents);
180}
181
182QColor QQuickMaterialBusyIndicator::color() const
183{
184 return m_color;
185}
186
187void QQuickMaterialBusyIndicator::setColor(const QColor &color)
188{
189 if (m_color == color)
190 return;
191
192 m_color = color;
193 update();
194}
195
196bool QQuickMaterialBusyIndicator::isRunning() const
197{
198 return isVisible();
199}
200
201void QQuickMaterialBusyIndicator::setRunning(bool running)
202{
203 if (running)
204 setVisible(true);
205}
206
207int QQuickMaterialBusyIndicator::elapsed() const
208{
209 return m_elapsed;
210}
211
212void QQuickMaterialBusyIndicator::itemChange(QQuickItem::ItemChange change, const QQuickItem::ItemChangeData &data)
213{
214 QQuickItem::itemChange(change, data);
215 switch (change) {
216 case ItemOpacityHasChanged:
217 if (qFuzzyIsNull(d: data.realValue))
218 setVisible(false);
219 break;
220 case ItemVisibleHasChanged:
221 update();
222 break;
223 default:
224 break;
225 }
226}
227
228QSGNode *QQuickMaterialBusyIndicator::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *)
229{
230 QQuickMaterialBusyIndicatorNode *node = static_cast<QQuickMaterialBusyIndicatorNode *>(oldNode);
231 if (isRunning() && width() > 0 && height() > 0) {
232 if (!node) {
233 node = new QQuickMaterialBusyIndicatorNode(this);
234 node->start();
235 }
236 node->sync(item: this);
237 } else {
238 m_elapsed = node ? node->currentTime() : 0;
239 delete node;
240 node = nullptr;
241 }
242 return node;
243}
244
245QT_END_NAMESPACE
246

source code of qtquickcontrols2/src/imports/controls/material/qquickmaterialbusyindicator.cpp