Default: rewrite the busy indicator animation

Use a simple animated node instead of using the private animator API.

Task-number: QTBUG-56601
Change-Id: Id420ef6faae0ddfc3a571e9b12be59c0d263fc38
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

1 files changed, 188 insertions, 0 deletions

diff --git a/src/imports/controls/qquickdefaultbusyindicator.cpp b/src/imports/controls/qquickdefaultbusyindicator.cpp
new file mode 100644
index 00000000..5b952476
--- /dev/null
+++ b/src/imports/controls/qquickdefaultbusyindicator.cpp
@@ -0,0 +1,188 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick Controls 2 module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qquickdefaultbusyindicator_p.h"
+
+#include <QtCore/qset.h>
+#include <QtCore/qelapsedtimer.h>
+#include <QtGui/qpainter.h>
+#include <QtQuick/private/qquickitem_p.h>
+#include <QtQuick/qquickwindow.h>
+#include <QtQuick/qsgnode.h>
+
+QT_BEGIN_NAMESPACE
+
+static const int CircleCount = 10;
+static const int TotalDuration = 100 * CircleCount * 2;
+static const QRgb TransparentColor = 0x00000000;
+static const QRgb FillColor = 0xFF353637;
+
+static QPointF moveCircle(const QPointF &pos, qreal rotation, qreal distance)
+{
+    return pos - QTransform().rotate(rotation).map(QPointF(0, distance));
+}
+
+class QQuickDefaultBusyIndicatorNode : public QObject, public QSGNode
+{
+public:
+    QQuickDefaultBusyIndicatorNode(QQuickDefaultBusyIndicator *item);
+
+    int elapsed() const;
+
+    void animate();
+    void sync(QQuickDefaultBusyIndicator *item);
+
+private:
+    int m_offset;
+    QElapsedTimer m_timer;
+};
+
+QQuickDefaultBusyIndicatorNode::QQuickDefaultBusyIndicatorNode(QQuickDefaultBusyIndicator *item)
+    : m_offset(item->elapsed())
+{
+    QQuickWindow *window = item->window();
+    connect(window, &QQuickWindow::frameSwapped, window, &QQuickWindow::update);
+    connect(window, &QQuickWindow::beforeRendering, this, &QQuickDefaultBusyIndicatorNode::animate);
+
+    for (int i = 0; i < CircleCount; ++i) {
+        QSGTransformNode *transformNode = new QSGTransformNode;
+        appendChildNode(transformNode);
+
+        QQuickItemPrivate *d = QQuickItemPrivate::get(item);
+        QSGInternalRectangleNode *rectNode = d->sceneGraphContext()->createInternalRectangleNode();
+        rectNode->setAntialiasing(true);
+        transformNode->appendChildNode(rectNode);
+    }
+
+    m_timer.restart();
+}
+
+int QQuickDefaultBusyIndicatorNode::elapsed() const
+{
+    return m_timer.elapsed() + m_offset;
+}
+
+void QQuickDefaultBusyIndicatorNode::animate()
+{
+    qint64 time = m_timer.elapsed() + m_offset;
+    if (time >= TotalDuration) {
+        m_timer.restart();
+        m_offset = 0;
+    }
+
+    const qreal percentageComplete = time / qreal(TotalDuration);
+    const qreal firstPhaseProgress = percentageComplete <= 0.5 ? percentageComplete * 2 : 0;
+    const qreal secondPhaseProgress = percentageComplete > 0.5 ? (percentageComplete - 0.5) * 2 : 0;
+
+    QSGTransformNode *transformNode = static_cast<QSGTransformNode*>(firstChild());
+    Q_ASSERT(transformNode->type() == QSGNode::TransformNodeType);
+    for (int i = 0; i < CircleCount; ++i) {
+        QSGInternalRectangleNode *rectNode = static_cast<QSGInternalRectangleNode*>(transformNode->firstChild());
+        Q_ASSERT(rectNode->type() == QSGNode::GeometryNodeType);
+
+        const bool fill = (firstPhaseProgress > qreal(i) / CircleCount) || (secondPhaseProgress > 0 && secondPhaseProgress < qreal(i) / CircleCount);
+        rectNode->setColor(QColor::fromRgba(fill ? FillColor : TransparentColor));
+        rectNode->setPenWidth(fill ? 0 : 1);
+        rectNode->update();
+
+        transformNode = static_cast<QSGTransformNode*>(transformNode->nextSibling());
+    }
+}
+
+void QQuickDefaultBusyIndicatorNode::sync(QQuickDefaultBusyIndicator *item)
+{
+    const qreal w = item->width();
+    const qreal h = item->height();
+    const qreal sz = qMin(w, h);
+    const qreal dx = (w - sz) / 2;
+    const qreal dy = (h - sz) / 2;
+    const int circleRadius = sz / 12;
+
+    QSGTransformNode *transformNode = static_cast<QSGTransformNode *>(firstChild());
+    for (int i = 0; i < CircleCount; ++i) {
+        Q_ASSERT(transformNode->type() == QSGNode::TransformNodeType);
+
+        QSGInternalRectangleNode *rectNode = static_cast<QSGInternalRectangleNode *>(transformNode->firstChild());
+        Q_ASSERT(rectNode->type() == QSGNode::GeometryNodeType);
+
+        QPointF pos = QPointF(sz / 2 - circleRadius, sz / 2 - circleRadius);
+        pos = moveCircle(pos, 360 / CircleCount * i, sz / 2 - circleRadius);
+
+        QMatrix4x4 m;
+        m.translate(dx + pos.x(), dy + pos.y());
+        transformNode->setMatrix(m);
+
+        rectNode->setRect(QRectF(QPointF(), QSizeF(circleRadius * 2, circleRadius * 2)));
+        rectNode->setRadius(circleRadius);
+
+        transformNode = static_cast<QSGTransformNode *>(transformNode->nextSibling());
+    }
+}
+
+QQuickDefaultBusyIndicator::QQuickDefaultBusyIndicator(QQuickItem *parent) :
+    QQuickItem(parent), m_elapsed(0)
+{
+    setFlag(ItemHasContents);
+}
+
+int QQuickDefaultBusyIndicator::elapsed() const
+{
+    return m_elapsed;
+}
+
+void QQuickDefaultBusyIndicator::itemChange(QQuickItem::ItemChange change, const QQuickItem::ItemChangeData &data)
+{
+    QQuickItem::itemChange(change, data);
+    if (change == ItemVisibleHasChanged)
+        update();
+}
+
+QSGNode *QQuickDefaultBusyIndicator::updatePaintNode(QSGNode *oldNode, QQuickItem::UpdatePaintNodeData *)
+{
+    QQuickDefaultBusyIndicatorNode *node = static_cast<QQuickDefaultBusyIndicatorNode *>(oldNode);
+    if (isVisible() && width() > 0 && height() > 0) {
+        if (!node)
+            node = new QQuickDefaultBusyIndicatorNode(this);
+        node->sync(this);
+    } else {
+        m_elapsed = node ? node->elapsed() : 0;
+        delete node;
+        node = nullptr;
+    }
+    return node;
+}
+
+QT_END_NAMESPACE