diff options
Diffstat (limited to 'src/quickcontrols/material/impl/qquickmaterialbusyindicator.cpp')
| -rw-r--r-- | src/quickcontrols/material/impl/qquickmaterialbusyindicator.cpp | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/src/quickcontrols/material/impl/qquickmaterialbusyindicator.cpp b/src/quickcontrols/material/impl/qquickmaterialbusyindicator.cpp new file mode 100644 index 0000000000..4d5b4e13e7 --- /dev/null +++ b/src/quickcontrols/material/impl/qquickmaterialbusyindicator.cpp @@ -0,0 +1,214 @@ +// Copyright (C) 2017 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only + +#include "qquickmaterialbusyindicator_p.h" + +#include <QtCore/qmath.h> +#include <QtCore/qeasingcurve.h> +#include <QtGui/qpainter.h> +#include <QtQuick/qsgimagenode.h> +#include <QtQuick/qquickwindow.h> +#include <QtQuickControls2Impl/private/qquickanimatednode_p.h> + +QT_BEGIN_NAMESPACE + +/* + Relevant Android code: + + - core/res/res/anim/progress_indeterminate_rotation_material.xml contains + the rotation animation data. + - core/res/res/anim/progress_indeterminate_material.xml contains the trim + animation data. + - core/res/res/interpolator/trim_start_interpolator.xml and + core/res/res/interpolator/trim_end_interpolator.xml contain the start + and end trim path interpolators. + - addCommand() in core/java/android/util/PathParser.java has a list of the + different path commands available. +*/ + +static const int SpanAnimationDuration = 700; +static const int RotationAnimationDuration = SpanAnimationDuration * 6; +static const int TargetRotation = 720; +static const int OneDegree = 16; +static const qreal MinSweepSpan = 10 * OneDegree; +static const qreal MaxSweepSpan = 300 * OneDegree; + +class QQuickMaterialBusyIndicatorNode : public QQuickAnimatedNode +{ +public: + QQuickMaterialBusyIndicatorNode(QQuickMaterialBusyIndicator *item); + + void sync(QQuickItem *item) override; + +protected: + void updateCurrentTime(int time) override; + +private: + int m_lastStartAngle = 0; + int m_lastEndAngle = 0; + qreal m_width = 0; + qreal m_height = 0; + qreal m_devicePixelRatio = 1; + QColor m_color; +}; + +QQuickMaterialBusyIndicatorNode::QQuickMaterialBusyIndicatorNode(QQuickMaterialBusyIndicator *item) + : QQuickAnimatedNode(item) +{ + setLoopCount(Infinite); + setCurrentTime(item->elapsed()); + setDuration(RotationAnimationDuration); + + QSGImageNode *textureNode = item->window()->createImageNode(); + textureNode->setOwnsTexture(true); + appendChildNode(textureNode); + + // A texture seems to be required here, but we don't have one yet, as we haven't drawn anything, + // so just use a blank image. + QImage blankImage(item->width(), item->height(), QImage::Format_ARGB32_Premultiplied); + blankImage.fill(Qt::transparent); + textureNode->setTexture(item->window()->createTextureFromImage(blankImage)); +} + +void QQuickMaterialBusyIndicatorNode::updateCurrentTime(int time) +{ + const qreal w = m_width; + const qreal h = m_height; + const qreal size = qMin(w, h); + const qreal dx = (w - size) / 2; + const qreal dy = (h - size) / 2; + + QImage image(size * m_devicePixelRatio, size * m_devicePixelRatio, QImage::Format_ARGB32_Premultiplied); + image.fill(Qt::transparent); + + QPainter painter(&image); + painter.setRenderHint(QPainter::Antialiasing); + + QPen pen; + QSGImageNode *textureNode = static_cast<QSGImageNode *>(firstChild()); + pen.setColor(m_color); + pen.setWidth(qCeil(size / 12) * m_devicePixelRatio); + painter.setPen(pen); + + const qreal percentageComplete = time / qreal(RotationAnimationDuration); + const qreal spanPercentageComplete = (time % SpanAnimationDuration) / qreal(SpanAnimationDuration); + const int iteration = time / SpanAnimationDuration; + int startAngle = 0; + int endAngle = 0; + + if (iteration % 2 == 0) { + if (m_lastStartAngle > 360 * OneDegree) + m_lastStartAngle -= 360 * OneDegree; + + // The start angle is only affected by the rotation animation for the "grow" phase. + startAngle = m_lastStartAngle; + QEasingCurve angleCurve(QEasingCurve::OutQuad); + const qreal percentage = angleCurve.valueForProgress(spanPercentageComplete); + endAngle = m_lastStartAngle + MinSweepSpan + percentage * (MaxSweepSpan - MinSweepSpan); + m_lastEndAngle = endAngle; + } else { + // Both the start angle *and* the span are affected by the "shrink" phase. + QEasingCurve angleCurve(QEasingCurve::InQuad); + const qreal percentage = angleCurve.valueForProgress(spanPercentageComplete); + startAngle = m_lastEndAngle - MaxSweepSpan + percentage * (MaxSweepSpan - MinSweepSpan); + endAngle = m_lastEndAngle; + m_lastStartAngle = startAngle; + } + + const int halfPen = pen.width() / 2; + const QRectF arcBounds = QRectF(halfPen, halfPen, + m_devicePixelRatio * size - pen.width(), + m_devicePixelRatio * size - pen.width()); + // The current angle of the rotation animation. + const qreal rotation = OneDegree * percentageComplete * -TargetRotation; + startAngle -= rotation; + endAngle -= rotation; + const int angleSpan = endAngle - startAngle; + painter.drawArc(arcBounds, -startAngle, -angleSpan); + painter.end(); + + textureNode->setRect(QRectF(dx, dy, size, size)); + textureNode->setTexture(window()->createTextureFromImage(image)); +} + +void QQuickMaterialBusyIndicatorNode::sync(QQuickItem *item) +{ + QQuickMaterialBusyIndicator *indicator = static_cast<QQuickMaterialBusyIndicator *>(item); + m_color = indicator->color(); + m_width = indicator->width(); + m_height = indicator->height(); + m_devicePixelRatio = indicator->window()->effectiveDevicePixelRatio(); +} + +QQuickMaterialBusyIndicator::QQuickMaterialBusyIndicator(QQuickItem *parent) : + QQuickItem(parent) +{ + setFlag(ItemHasContents); +} + +QColor QQuickMaterialBusyIndicator::color() const +{ + return m_color; +} + +void QQuickMaterialBusyIndicator::setColor(const QColor &color) +{ + if (m_color == color) + return; + + m_color = color; + update(); +} + +bool QQuickMaterialBusyIndicator::isRunning() const +{ + return isVisible(); +} + +void QQuickMaterialBusyIndicator::setRunning(bool running) +{ + if (running) + setVisible(true); +} + +int QQuickMaterialBusyIndicator::elapsed() const +{ + return m_elapsed; +} + +void QQuickMaterialBusyIndicator::itemChange(QQuickItem::ItemChange change, const QQuickItem::ItemChangeData &data) +{ + QQuickItem::itemChange(change, data); + switch (change) { + case ItemOpacityHasChanged: + if (qFuzzyIsNull(data.realValue)) + setVisible(false); + break; + case ItemVisibleHasChanged: + update(); + break; + default: + break; + } +} + +QSGNode *QQuickMaterialBusyIndicator::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *) +{ + QQuickMaterialBusyIndicatorNode *node = static_cast<QQuickMaterialBusyIndicatorNode *>(oldNode); + if (isRunning() && width() > 0 && height() > 0) { + if (!node) { + node = new QQuickMaterialBusyIndicatorNode(this); + node->start(); + } + node->sync(this); + } else { + m_elapsed = node ? node->currentTime() : 0; + delete node; + node = nullptr; + } + return node; +} + +QT_END_NAMESPACE + +#include "moc_qquickmaterialbusyindicator_p.cpp" |