A very simple version of editing model data.

model/modelitem.cpp

@@ -5,4 +5,14 @@ ModelItem::ModelItem(const QHash<int, QVariant> values)
 
 QVariant ModelItem::data(int role) const { return m_values.value(role); }
 
-bool ModelItem::setData(const QVariant& value, int role) {}
+bool ModelItem::setData(const QVariant& value, int role) {
+  bool valueChanged = false;
+  if (m_values.contains(role)) {
+    if (m_values.value(role) != value) {
+      valueChanged = true;
+    }
+  }
+  m_values[role] = value;
+
+  return valueChanged;
+}