QmlDesigner: Add StateGroups to Connections

Task-number: QDS-8027
Change-Id: I72ce5bfd2505269ad750ee5fbd5b13669891290f
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/plugins/qmldesigner/components/componentcore/designeractionmanager.cpp

@@ -492,6 +492,22 @@ struct SlotEntry
     std::function<void(SignalHandlerProperty)> action;
 };
 
+QList<ModelNode> stateGroups(const ModelNode &node)
+{
+    if (!node.view()->isAttached())
+        return {};
+
+    const auto groupMetaInfo = node.view()->model()->qtQuickStateGroupMetaInfo();
+
+    return node.view()->allModelNodesOfType(groupMetaInfo);
+}
+
+QStringList stateGroupsNames(const ModelNode &node)
+{
+    return Utils::transform(stateGroups(node),
+                            [](const ModelNode &node) { return node.displayName(); });
+}
+
 QList<SlotEntry> getSlotsLists(const ModelNode &node)
 {
     if (!node.isValid())
@@ -528,6 +544,32 @@ QList<SlotEntry> getSlotsLists(const ModelNode &node)
         resultList.push_back(entry);
     }
 
+    const auto sg = stateGroups(node);
+
+    for (const auto &stateGroup : sg) {
+        QmlObjectNode stateGroupObjectNode(stateGroup);
+        const QString stateGroupCategory = QString("Change State Group") + " "
+                                           + stateGroup.displayName();
+
+        const SlotEntry defaultGroupState = {stateGroupCategory,
+                                        (stateGroupCategory + " to " + "Default State"),
+                                        [stateGroup](SignalHandlerProperty signalHandler) {
+                                            signalHandler.setSource(
+                                                QString("%1.state = \"\"").arg(stateGroup.id()));
+                                        }};
+        resultList.push_back(defaultGroupState);
+
+        for (const auto &stateName : stateGroupObjectNode.states().names()) {
+            SlotEntry entry = {stateGroupCategory,
+                               (stateGroupCategory + " to " + stateName),
+                               [stateGroup, stateName](SignalHandlerProperty signalHandler) {
+                                   signalHandler.setSource(
+                                       QString("%1.state = \"%2\"").arg(stateGroup.id(), stateName));
+                               }};
+            resultList.push_back(entry);
+        }
+    }
+
     return resultList;
 }