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36
37#include "qquickdefaultprogressbar_p.h"
38
39#include <QtCore/qeasingcurve.h>
40#include <QtQuick/private/qquickitem_p.h>
41#include <QtQuick/private/qsgadaptationlayer_p.h>
42#include <QtQuickControls2/private/qquickanimatednode_p.h>
43
44QT_BEGIN_NAMESPACE
45
46static const int Blocks = 4;
47static const int BlockWidth = 16;
48static const int BlockRestingSpacing = 4;
49static const int BlockMovingSpacing = 48;
50static const int BlockSpan = Blocks * (BlockWidth + BlockRestingSpacing) - BlockRestingSpacing;
51static const int TotalDuration = 4000;
52static const int SecondPhaseStart = TotalDuration * 0.4;
53static const int ThirdPhaseStart = TotalDuration * 0.6;
54
55static inline qreal blockStartX(int blockIndex)
56{
57 return ((blockIndex + 1) * -BlockWidth) - (blockIndex * BlockMovingSpacing);
58}
59
60static inline qreal blockRestX(int blockIndex, qreal availableWidth)
61{
62 const qreal spanRightEdgePos = availableWidth / 2 + BlockSpan / 2.0;
63 return spanRightEdgePos - (blockIndex + 1) * BlockWidth - (blockIndex * BlockRestingSpacing);
64}
65
66static inline qreal blockEndX(int blockIndex, qreal availableWidth)
67{
68 return availableWidth - blockStartX(blockIndex: Blocks - 1 - blockIndex) - BlockWidth;
69}
70
71class QQuickDefaultProgressBarNode : public QQuickAnimatedNode
72{
73public:
74 QQuickDefaultProgressBarNode(QQuickDefaultProgressBar *item);
75
76 void updateCurrentTime(int time) override;
77 void sync(QQuickItem *item) override;
78
79private:
80 bool m_indeterminate = false;
81 qreal m_pixelsPerSecond = 0;
82};
83
84QQuickDefaultProgressBarNode::QQuickDefaultProgressBarNode(QQuickDefaultProgressBar *item)
85 : QQuickAnimatedNode(item),
86 m_pixelsPerSecond(item->width())
87{
88 setLoopCount(Infinite);
89 setDuration(TotalDuration);
90}
91
92void QQuickDefaultProgressBarNode::updateCurrentTime(int time)
93{
94 QSGTransformNode *transformNode = static_cast<QSGTransformNode*>(firstChild());
95 for (int i = 0; i < Blocks; ++i) {
96 Q_ASSERT(transformNode->type() == QSGNode::TransformNodeType);
97
98 QMatrix4x4 m;
99 const qreal restX = blockRestX(blockIndex: i, availableWidth: m_pixelsPerSecond);
100 const qreal timeInSeconds = time / 1000.0;
101
102 if (time < SecondPhaseStart) {
103 // Move into the resting position for the first phase.
104 QEasingCurve easingCurve(QEasingCurve::InQuad);
105 const qreal easedCompletion = easingCurve.valueForProgress(progress: time / qreal(SecondPhaseStart));
106 const qreal distance = m_pixelsPerSecond * (easedCompletion * (SecondPhaseStart / 1000.0));
107 const qreal position = blockStartX(blockIndex: i) + distance;
108 const qreal destination = restX;
109 m.translate(x: qMin(a: position, b: destination), y: 0);
110 } else if (time < ThirdPhaseStart) {
111 // Stay in the same position for the second phase.
112 m.translate(x: restX, y: 0);
113 } else {
114 // Move out of view for the third phase.
115 const int thirdPhaseSubKickoff = (BlockMovingSpacing / m_pixelsPerSecond) * 1000;
116 const int subphase = (time - ThirdPhaseStart) / thirdPhaseSubKickoff;
117 // If we're not at this subphase yet, don't try to animate movement,
118 // because it will be incorrect.
119 if (subphase < i)
120 return;
121
122 const qreal timeSinceSecondPhase = timeInSeconds - (ThirdPhaseStart / 1000.0);
123 // We only want to start keeping track of time once our subphase has started,
124 // otherwise we move too much because we account for time that has already elapsed.
125 // For example, if we were 60 milliseconds into the third subphase:
126 //
127 // 0 ..... 1 ..... 2 ...
128 // 100 100 60
129 //
130 // i == 0, timeSinceOurKickoff == 260
131 // i == 1, timeSinceOurKickoff == 160
132 // i == 2, timeSinceOurKickoff == 60
133 const qreal timeSinceOurKickoff = timeSinceSecondPhase - (thirdPhaseSubKickoff / 1000.0 * i);
134 const qreal position = restX + (m_pixelsPerSecond * (timeSinceOurKickoff));
135 const qreal destination = blockEndX(blockIndex: i, availableWidth: m_pixelsPerSecond);
136 m.translate(x: qMin(a: position, b: destination), y: 0);
137 }
138
139 transformNode->setMatrix(m);
140
141 transformNode = static_cast<QSGTransformNode*>(transformNode->nextSibling());
142 }
143}
144
145void QQuickDefaultProgressBarNode::sync(QQuickItem *item)
146{
147 QQuickDefaultProgressBar *bar = static_cast<QQuickDefaultProgressBar *>(item);
148 if (m_indeterminate != bar->isIndeterminate()) {
149 m_indeterminate = bar->isIndeterminate();
150 if (m_indeterminate)
151 start();
152 else
153 stop();
154 }
155 m_pixelsPerSecond = item->width();
156
157 QQuickItemPrivate *d = QQuickItemPrivate::get(item);
158
159 QMatrix4x4 m;
160 m.translate(x: 0, y: (item->height() - item->implicitHeight()) / 2);
161 setMatrix(m);
162
163 if (m_indeterminate) {
164 if (childCount() != Blocks) {
165 // This was previously a regular progress bar; remove the old nodes.
166 removeAllChildNodes();
167 }
168
169 QSGTransformNode *transformNode = static_cast<QSGTransformNode*>(firstChild());
170 for (int i = 0; i < Blocks; ++i) {
171 if (!transformNode) {
172 transformNode = new QSGTransformNode;
173 appendChildNode(node: transformNode);
174 }
175
176 QSGInternalRectangleNode *rectNode = static_cast<QSGInternalRectangleNode*>(transformNode->firstChild());
177 if (!rectNode) {
178 rectNode = d->sceneGraphContext()->createInternalRectangleNode();
179 rectNode->setColor(bar->color());
180 transformNode->appendChildNode(node: rectNode);
181 }
182
183 QMatrix4x4 m;
184 m.translate(x: blockStartX(blockIndex: i), y: 0);
185 transformNode->setMatrix(m);
186
187 rectNode->setRect(QRectF(QPointF(0, 0), QSizeF(BlockWidth, item->implicitHeight())));
188 rectNode->update();
189
190 transformNode = static_cast<QSGTransformNode *>(transformNode->nextSibling());
191 }
192 } else {
193 if (childCount() > 1) {
194 // This was previously an indeterminate progress bar; remove the old nodes.
195 removeAllChildNodes();
196 }
197
198 QSGInternalRectangleNode *rectNode = static_cast<QSGInternalRectangleNode *>(firstChild());
199 if (!rectNode) {
200 rectNode = d->sceneGraphContext()->createInternalRectangleNode();
201 rectNode->setColor(bar->color());
202 appendChildNode(node: rectNode);
203 }
204
205 rectNode->setRect(QRectF(QPointF(0, 0), QSizeF(bar->progress() * item->width(), item->implicitHeight())));
206 rectNode->update();
207 }
208}
209
210QQuickDefaultProgressBar::QQuickDefaultProgressBar(QQuickItem *parent) :
211 QQuickItem(parent)
212{
213 setFlag(flag: ItemHasContents);
214}
215
216qreal QQuickDefaultProgressBar::progress() const
217{
218 return m_progress;
219}
220
221void QQuickDefaultProgressBar::setProgress(qreal progress)
222{
223 if (progress == m_progress)
224 return;
225
226 m_progress = progress;
227 update();
228}
229
230bool QQuickDefaultProgressBar::isIndeterminate() const
231{
232 return m_indeterminate;
233}
234
235void QQuickDefaultProgressBar::setIndeterminate(bool indeterminate)
236{
237 if (indeterminate == m_indeterminate)
238 return;
239
240 m_indeterminate = indeterminate;
241 setClip(m_indeterminate);
242 update();
243}
244
245QColor QQuickDefaultProgressBar::color() const
246{
247 return m_color;
248}
249
250void QQuickDefaultProgressBar::setColor(const QColor &color)
251{
252 if (color == m_color)
253 return;
254
255 m_color = color;
256 update();
257}
258
259void QQuickDefaultProgressBar::itemChange(QQuickItem::ItemChange change, const QQuickItem::ItemChangeData &data)
260{
261 QQuickItem::itemChange(change, data);
262 if (change == ItemVisibleHasChanged)
263 update();
264}
265
266QSGNode *QQuickDefaultProgressBar::updatePaintNode(QSGNode *oldNode, QQuickItem::UpdatePaintNodeData *)
267{
268 QQuickDefaultProgressBarNode *node = static_cast<QQuickDefaultProgressBarNode *>(oldNode);
269 if (isVisible() && width() > 0 && height() > 0) {
270 if (!node)
271 node = new QQuickDefaultProgressBarNode(this);
272 node->sync(item: this);
273 } else {
274 delete node;
275 node = nullptr;
276 }
277 return node;
278}
279
280QT_END_NAMESPACE
281

source code of qtquickcontrols2/src/imports/controls/qquickdefaultprogressbar.cpp