1 files changed, 161 insertions, 0 deletions
diff --git a/examples/charts/chartsgallery/legendmarkerswidget.cpp b/examples/charts/chartsgallery/legendmarkerswidget.cpp
new file mode 100644
index 00000000..0d739bb1
--- /dev/null
+++ b/examples/charts/chartsgallery/legendmarkerswidget.cpp
@@ -0,0 +1,161 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
+
+#include "legendmarkerswidget.h"
+
+#include <QChart>
+#include <QChartView>
+#include <QGraphicsLayout>
+#include <QGridLayout>
+#include <QLegend>
+#include <QLegendMarker>
+#include <QLineSeries>
+#include <QtMath>
+#include <QXYLegendMarker>
+
+LegendMarkersWidget::LegendMarkersWidget(QWidget *parent)
+    : ContentWidget(parent)
+{
+    // Create chart view with the chart
+    m_chart = new QChart;
+    m_chartView = new QChartView(m_chart, this);
+
+    // Create layout for grid and detached legend
+    m_mainLayout = new QGridLayout;
+    m_mainLayout->addWidget(m_chartView, 0, 1, 3, 1);
+    setLayout(m_mainLayout);
+
+    // Add few series
+    addSeries();
+    addSeries();
+    addSeries();
+    addSeries();
+
+    connectMarkers();
+
+    // Set the title and show legend
+    m_chart->setTitle("Legend Markers (Click on legend to interact)");
+    m_chart->legend()->setVisible(true);
+    m_chart->legend()->setAlignment(Qt::AlignBottom);
+
+    m_chartView->setRenderHint(QPainter::Antialiasing);
+    m_chart->layout()->setContentsMargins(0, 0, 0, 0);
+}
+
+void LegendMarkersWidget::addSeries()
+{
+    auto series = new QLineSeries;
+    m_series.append(series);
+
+    series->setName(QString("line " + QString::number(m_series.count())));
+
+    // Make some sine wave for data
+    QList<QPointF> data;
+    int offset = m_chart->series().count();
+    for (int i = 0; i < 360; i++) {
+        qreal x = offset * 20 + i;
+        data.append(QPointF(i, qSin(qDegreesToRadians(x))));
+    }
+
+    series->append(data);
+    m_chart->addSeries(series);
+
+    if (m_series.count() == 1)
+        m_chart->createDefaultAxes();
+}
+
+void LegendMarkersWidget::removeSeries()
+{
+    // Remove last series from chart
+    if (m_series.count() > 0) {
+        QLineSeries *series = m_series.last();
+        m_chart->removeSeries(series);
+        m_series.removeLast();
+        delete series;
+    }
+}
+
+void LegendMarkersWidget::connectMarkers()
+{
+//![1]
+    // Connect all markers to handler
+    const auto markers = m_chart->legend()->markers();
+    for (QLegendMarker *marker : markers) {
+        // Disconnect possible existing connection to avoid multiple connections
+        QObject::disconnect(marker, &QLegendMarker::clicked,
+                            this, &LegendMarkersWidget::handleMarkerClicked);
+        QObject::connect(marker, &QLegendMarker::clicked,
+                         this, &LegendMarkersWidget::handleMarkerClicked);
+    }
+//![1]
+}
+
+void LegendMarkersWidget::disconnectMarkers()
+{
+//![2]
+    const auto markers = m_chart->legend()->markers();
+    for (QLegendMarker *marker : markers) {
+        QObject::disconnect(marker, &QLegendMarker::clicked,
+                            this, &LegendMarkersWidget::handleMarkerClicked);
+    }
+//![2]
+}
+
+void LegendMarkersWidget::handleMarkerClicked()
+{
+//![3]
+    auto marker = qobject_cast<QLegendMarker *>(sender());
+    Q_ASSERT(marker);
+//![3]
+
+//![4]
+    switch (marker->type())
+//![4]
+    {
+    case QLegendMarker::LegendMarkerTypeXY:
+        {
+//![5]
+        // Toggle visibility of series
+        marker->series()->setVisible(!marker->series()->isVisible());
+
+        // Turn legend marker back to visible, since hiding series also hides the marker
+        // and we don't want it to happen now.
+        marker->setVisible(true);
+//![5]
+
+//![6]
+        // Dim the marker, if series is not visible
+        qreal alpha = 1.0;
+
+        if (!marker->series()->isVisible())
+            alpha = 0.5;
+
+        QColor color;
+        QBrush brush = marker->labelBrush();
+        color = brush.color();
+        color.setAlphaF(alpha);
+        brush.setColor(color);
+        marker->setLabelBrush(brush);
+
+        brush = marker->brush();
+        color = brush.color();
+        color.setAlphaF(alpha);
+        brush.setColor(color);
+        marker->setBrush(brush);
+
+        QPen pen = marker->pen();
+        color = pen.color();
+        color.setAlphaF(alpha);
+        pen.setColor(color);
+        marker->setPen(pen);
+
+//![6]
+        break;
+        }
+    default:
+        {
+        qDebug("Unknown marker type");
+        break;
+        }
+    }
+}