QmlDesigner: Add action for setting initial FlowItem

Change-Id: I23170f08b45a9560c3d6cae6f6d56396de9aab8b
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/plugins/qmldesigner/components/componentcore/componentcore_constants.h

@@ -57,6 +57,7 @@ const char anchorsFillCommandId[] = "AnchorsFill";
 const char anchorsResetCommandId[] = "AnchorsReset";
 const char removePositionerCommandId[] = "RemovePositioner";
 const char createFlowActionAreaCommandId[] = "CreateFlowActionArea";
+const char setFlowStartCommandId[] = "SetFlowStart";
 const char layoutRowPositionerCommandId[] = "LayoutRowPositioner";
 const char layoutColumnPositionerCommandId[] = "LayoutColumnPositioner";
 const char layoutGridPositionerCommandId[] = "LayoutGridPositioner";
@@ -124,6 +125,7 @@ const char layoutGridPositionerDisplayName[] = QT_TRANSLATE_NOOP("QmlDesignerCon
 const char layoutFlowPositionerDisplayName[] = QT_TRANSLATE_NOOP("QmlDesignerContextMenu", "Position in Flow");
 const char removePositionerDisplayName[] = QT_TRANSLATE_NOOP("QmlDesignerContextMenu", "Remove Positioner");
 const char createFlowActionAreaDisplayName[] = QT_TRANSLATE_NOOP("QmlDesignerContextMenu", "Create Flow Action");
+const char setFlowStartDisplayName[] = QT_TRANSLATE_NOOP("QmlDesignerContextMenu", "Set Flow Start");
 const char removeLayoutDisplayName[] = QT_TRANSLATE_NOOP("QmlDesignerContextMenu", "Remove Layout");
 
 const char addItemToStackedContainerDisplayName[] = QT_TRANSLATE_NOOP("QmlDesignerContextMenu", "Add Item");

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

@@ -874,6 +874,17 @@ void DesignerActionManager::createDefaultDesignerActions()
         &isFlowItem,
         &flowOptionVisible));
 
+    addDesignerAction(new ModelNodeContextMenuAction(
+                          setFlowStartCommandId,
+                          setFlowStartDisplayName,
+                          {},
+                          flowCategory,
+                          priorityFirst,
+                          {},
+                          &setFlowStartItem,
+                          &isFlowItem,
+                          &flowOptionVisible));
+
     addDesignerAction(new FlowActionConnectAction(
         flowConnectionCategoryDisplayName,
         flowConnectionCategory,

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

@@ -1100,7 +1100,24 @@ void addFlowEffect(const SelectionContext &selectionContext, const TypeName &typ
                                       container.nodeProperty("effect").reparentHere(effectNode);
                                       view->setSelectedModelNode(effectNode);
                                   }
-                              });
+   });
+}
+
+void setFlowStartItem(const SelectionContext &selectionContext)
+{
+    AbstractView *view = selectionContext.view();
+
+    QTC_ASSERT(view && selectionContext.hasSingleSelectedModelNode(), return);
+    ModelNode node = selectionContext.currentSingleSelectedNode();
+    QTC_ASSERT(node.isValid(), return);
+    QTC_ASSERT(node.metaInfo().isValid(), return);
+    QmlFlowItemNode flowItem(node);
+    QTC_ASSERT(flowItem.isValid(), return);
+    QTC_ASSERT(flowItem.flowView().isValid(), return);
+    view->executeInTransaction("DesignerActionManager:setFlowStartItem",
+                               [&flowItem](){
+        flowItem.flowView().setStartFlowItem(flowItem);
+    });
 }
 
 } // namespace Mode

src/plugins/qmldesigner/components/componentcore/modelnodeoperations.h

@@ -77,6 +77,7 @@ bool addFontToProject(const QStringList &fileNames, const QString &directory);
 void createFlowActionArea(const SelectionContext &selectionContext);
 void addTransition(const SelectionContext &selectionState);
 void addFlowEffect(const SelectionContext &selectionState, const TypeName &typeName);
+void setFlowStartItem(const SelectionContext &selectionContext);
 
 } // namespace ModelNodeOperationso
 } //QmlDesigner