1 files changed, 39 insertions, 0 deletions
diff --git a/examples/datavisualization/graphgallery/variantdataset.py b/examples/datavisualization/graphgallery/variantdataset.py
new file mode 100644
index 000000000..752bc3887
--- /dev/null
+++ b/examples/datavisualization/graphgallery/variantdataset.py
@@ -0,0 +1,39 @@
+# Copyright (C) 2023 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+from PySide6.QtCore import QObject, Signal
+
+
+class VariantDataSet(QObject):
+
+    itemsAdded = Signal(int, int)
+    dataCleared = Signal()
+
+    def __init__(self):
+        super().__init__()
+        self._variantData = []
+
+    def clear(self):
+        for item in self._variantData:
+            item.clear()
+            del item
+
+        self._variantData.clear()
+        self.dataCleared.emit()
+
+    def addItem(self, item):
+        self._variantData.append(item)
+        addIndex = len(self._variantData)
+
+        self.itemsAdded.emit(addIndex, 1)
+        return addIndex
+
+    def addItems(self, itemList):
+        newCount = len(itemList)
+        addIndex = len(self._variantData)
+        self._variantData.extend(itemList)
+        self.itemsAdded.emit(addIndex, newCount)
+        return addIndex
+
+    def itemList(self):
+        return self._variantData