started VHDL generation of GroupBlock

[blast.git] / ConnectionItem.cpp

diff --git a/ConnectionItem.cpp b/ConnectionItem.cpp
index 5dcd338dc47b60392dc7520fb7287e6ac44a3c14..4de86cb09f28ebda9dcff07d4b888bd59e0022d5 100644 (file)
--- a/ConnectionItem.cpp
+++ b/ConnectionItem.cpp
@@ -876,18 +876,22 @@ void ConnectionItem::contextMenuEvent(QGraphicsSceneContextMenuEvent * event) {
   /* have to check if the connection can be removed.
      If the from or to InterfaceItem is owned by a group item, and this item
      is both connected to and from, thus it is impossible to remove this connection
+     because there would be a  group interface alone and not connected and this situation is not allowed.
+
+     Nevertheless, there are 2 exceptions :
+        - a from group interface is connected to more than one input interface
+        - the connection is between a source block outside the top group and the top group
    */
   bool canRemove = true;
-  InterfaceItem* groupIfaceItem = NULL;
+
   if (fromInterfaceItem->getOwner()->isGroupItem()) {
-    groupIfaceItem = fromInterfaceItem;
-  }
-  else if (toInterfaceItem->getOwner()->isGroupItem()) {
-    groupIfaceItem = toInterfaceItem;
+    ConnectedInterface* ref = fromInterfaceItem->refInter;
+    if ((ref->isConnectedFrom()) && (ref->getConnectedTo().length() == 1)) {
+      canRemove = false;
+    }
   }
-
-  if (groupIfaceItem != NULL) {
-    ConnectedInterface* ref = groupIfaceItem->refInter;
+  else if ((toInterfaceItem->getOwner()->isGroupItem()) && (! toInterfaceItem->getOwner()->getRefBlock()->isTopGroupBlock())) {
+    ConnectedInterface* ref = toInterfaceItem->refInter;
     if ((ref->isConnectedFrom()) && (ref->isConnectedTo())) {
       canRemove = false;
     }