Удаление пустой группы

Author: Sergey Agafonov

src/groupitem.cpp

@@ -191,6 +191,9 @@ void GroupItem::removeNode(NodeItem *node)
 
     m_nodeList.removeOne(node);
     updateSize();
+
+    if(m_nodeList.isEmpty())
+        emit becameEmpty(this);
 }
 
 void GroupItem::clearNodes()

src/groupitem.h

@@ -42,6 +42,7 @@ class GroupItem : public QGraphicsObject
 
 signals:
     void selected(bool state);
+    void becameEmpty(GroupItem *group);
 
 public slots:
     bool isHovered(const QPointF &point);

src/nodeview.cpp

@@ -431,6 +431,7 @@ void NodeView::addGroup(GroupItem *group)
     group->setPos(m_scenePos);
     m_scene->addItem(group);
     m_groupList.append(group);
+    connect(group, &GroupItem::becameEmpty, this, &NodeView::removeGroup);
 }
 
 GroupItem *NodeView::createGroup(QList<NodeItem *> list)
@@ -458,6 +459,15 @@ GroupItem *NodeView::getItemGroup(NodeItem *node)
     return result;
 }
 
+void NodeView::removeGroup(GroupItem *group)
+{
+    if (!m_groupList.contains(group)) return;
+
+    group->clearNodes();
+    m_groupList.removeOne(group);
+    m_scene->removeItem(group);
+}
+
 bool NodeView::createConnection(PortItem *portOut, PortItem *portIn)
 {
     bool result = false;

src/nodeview.h

@@ -68,6 +68,7 @@ public slots:
     void addGroup(GroupItem *group);
     GroupItem *createGroup(QList<NodeItem*> list);
     GroupItem *getItemGroup(NodeItem* node);
+    void removeGroup(GroupItem *group);
 
     bool createConnection(PortItem *portOut, PortItem *portIn);
     void removePortConnections(PortItem *port);