1 files changed, 105 insertions, 0 deletions
diff --git a/examples/charts/chartsgallery/nesteddonutswidget.cpp b/examples/charts/chartsgallery/nesteddonutswidget.cpp
new file mode 100644
index 00000000..25c103c9
--- /dev/null
+++ b/examples/charts/chartsgallery/nesteddonutswidget.cpp
@@ -0,0 +1,105 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
+
+#include "nesteddonutswidget.h"
+
+#include <QChart>
+#include <QChartView>
+#include <QGraphicsLayout>
+#include <QGridLayout>
+#include <QLegend>
+#include <QPieSeries>
+#include <QPieSlice>
+#include <QRandomGenerator>
+#include <QTimer>
+
+NestedDonutsWidget::NestedDonutsWidget(QWidget *parent)
+    : ContentWidget(parent)
+{
+    //! [1]
+    auto chartView = new QChartView(this);
+    chartView->setRenderHint(QPainter::Antialiasing);
+    QChart *chart = chartView->chart();
+    chart->legend()->setVisible(false);
+    chart->setTitle("Nested Donuts (Hover over segments to explode them)");
+    chart->setAnimationOptions(QChart::AllAnimations);
+    chart->layout()->setContentsMargins(0, 0, 0, 0);
+    //! [1]
+
+    //! [2]
+    qreal minSize = 0.1;
+    qreal maxSize = 0.9;
+    int donutCount = 5;
+    //! [2]
+
+    //! [3]
+    for (int i = 0; i < donutCount; i++) {
+        auto donut = new QPieSeries;
+        int sliceCount =  3 + QRandomGenerator::global()->bounded(3);
+        for (int j = 0; j < sliceCount; j++) {
+            qreal value = 100 + QRandomGenerator::global()->bounded(100);
+            auto slice = new QPieSlice(QString("%1").arg(value), value);
+            slice->setLabelVisible(true);
+            slice->setLabelColor(Qt::white);
+            slice->setLabelPosition(QPieSlice::LabelInsideTangential);
+            connect(slice, &QPieSlice::hovered, this, &NestedDonutsWidget::explodeSlice);
+            donut->append(slice);
+            donut->setHoleSize(minSize + i * (maxSize - minSize) / donutCount);
+            donut->setPieSize(minSize + (i + 1) * (maxSize - minSize) / donutCount);
+        }
+        m_donuts.append(donut);
+        chartView->chart()->addSeries(donut);
+    }
+    //! [3]
+
+    // create main layout
+    //! [4]
+    auto mainLayout = new QGridLayout;
+    mainLayout->addWidget(chartView, 1, 1);
+    setLayout(mainLayout);
+    //! [4]
+
+    //! [5]
+    m_updateTimer = new QTimer(this);
+    connect(m_updateTimer, &QTimer::timeout, this, &NestedDonutsWidget::updateRotation);
+    m_updateTimer->start(1250);
+    //! [5]
+}
+
+//! [6]
+void NestedDonutsWidget::updateRotation()
+{
+    for (int i = 0; i < m_donuts.count(); i++) {
+        QPieSeries *donut = m_donuts.at(i);
+        qreal phaseShift =  -50 + QRandomGenerator::global()->bounded(100);
+        donut->setPieStartAngle(donut->pieStartAngle() + phaseShift);
+        donut->setPieEndAngle(donut->pieEndAngle() + phaseShift);
+    }
+}
+//! [6]
+
+//! [7]
+void NestedDonutsWidget::explodeSlice(bool exploded)
+{
+    auto slice = qobject_cast<QPieSlice *>(sender());
+    if (exploded) {
+        m_updateTimer->stop();
+        qreal sliceStartAngle = slice->startAngle();
+        qreal sliceEndAngle = slice->startAngle() + slice->angleSpan();
+
+        QPieSeries *donut = slice->series();
+        qreal seriesIndex = m_donuts.indexOf(donut);
+        for (int i = seriesIndex + 1; i < m_donuts.count(); i++) {
+            m_donuts.at(i)->setPieStartAngle(sliceEndAngle);
+            m_donuts.at(i)->setPieEndAngle(360 + sliceStartAngle);
+        }
+    } else {
+        for (int i = 0; i < m_donuts.count(); i++) {
+            m_donuts.at(i)->setPieStartAngle(0);
+            m_donuts.at(i)->setPieEndAngle(360);
+        }
+        m_updateTimer->start();
+    }
+    slice->setExploded(exploded);
+}
+//! [7]