fix insert node error in python3

Author: ArnoChenFx

NodeGraphQt/base/graph.py

@@ -12,7 +12,7 @@
 from NodeGraphQt.base.factory import NodeFactory
 from NodeGraphQt.base.menu import NodeGraphMenu, NodesMenu
 from NodeGraphQt.base.model import NodeGraphModel
-from NodeGraphQt.base.node import NodeObject
+from NodeGraphQt.base.node import NodeObject,BaseNode
 from NodeGraphQt.base.port import Port
 from NodeGraphQt.constants import (DRAG_DROP_ID,
                                    PIPE_LAYOUT_CURVED,
@@ -121,17 +121,21 @@ def _wire_signals(self):
         self._viewer.node_selected.connect(self._on_node_selected)
         self._viewer.data_dropped.connect(self._on_node_data_dropped)
 
-    def _insert_node(self,items):
+    def _insert_node(self, items):
         pipe = items[0]
         node = self.get_node_by_id(items[1])
+        if not isinstance(node,BaseNode):
+            return
 
         disconnected = [(pipe.input_port, pipe.output_port)]
         connected = []
+
         if node.inputs():
-            connected.append((pipe.output_port,node.input(0).view))
+            connected.append((pipe.output_port, list(node.inputs().values())[0].view))
         if node.outputs():
-            connected.append((node.output(0).view,pipe.input_port))
-        self._on_connection_changed(disconnected,connected)
+            connected.append((list(node.outputs().values())[0].view, pipe.input_port))
+
+        self._on_connection_changed(disconnected, connected)
 
     def _toggle_tab_search(self):
         """
@@ -885,7 +889,6 @@ def _serialize(self, nodes):
         serial_data = {'nodes': {}, 'connections': []}
         nodes_data = {}
         for n in nodes:
-
             # update the node model.
             n.update_model()
 

NodeGraphQt/widgets/viewer.py

@@ -319,8 +319,11 @@ def mouseMoveEvent(self, event):
                 for pipe in self.selected_pipes():
                     pipe.setSelected(False)
                 for item in node.collidingItems():
-                    if isinstance(item, Pipe):
-                        if not item.input_port.node is node and not item.output_port.node is node:
+                    if isinstance(item, Pipe) and item.isVisible():
+                        if not item.input_port:
+                            continue
+                        if not item.input_port.node is node and \
+                                not item.output_port.node is node:
                             item.setSelected(True)
                             self.Colliding_state = True
                             break