Merge pull request #123 from jchanvfx/port_disconnect_signal_#122

port disconnected signal

NodeGraphQt/__init__.py

@@ -84,6 +84,7 @@ def __init__(self):
 from .base.node import NodeObject, BaseNode, BackdropNode
 from .base.port import Port
 from .pkg_info import __version__ as VERSION
+from .pkg_info import __license__ as LICENSE
 
 # functions
 from .base.actions import setup_context_menu
@@ -94,7 +95,7 @@ def __init__(self):
 
 __version__ = VERSION
 __all__ = [
-    'BackdropNode', 'BaseNode', 'Menu', 'MenuCommand', 'NodeGraph',
+    'BackdropNode', 'BaseNode', 'LICENSE', 'Menu', 'MenuCommand', 'NodeGraph',
     'NodeObject', 'NodeTreeWidget', 'Port', 'PropertiesBinWidget', 'VERSION',
     'constants', 'setup_context_menu'
 ]

NodeGraphQt/base/graph.py

@@ -35,6 +35,8 @@ class NodeGraph(QtCore.QObject):
     node_double_clicked = QtCore.Signal(NodeObject)
     #: signal for when a node has been connected emits (source port, target port).
     port_connected = QtCore.Signal(Port, Port)
+    #: signal for when a node has been disconnected emits (source port, target port).
+    port_disconnected = QtCore.Signal(Port, Port)
     #: signal for when a node property has changed emits (node, property name, property value).
     property_changed = QtCore.Signal(NodeObject, str, object)
     #: signal for when drop data has been added to the graph.

NodeGraphQt/base/port.py

@@ -126,7 +126,8 @@ def connected_ports(self):
 
     def connect_to(self, port=None):
         """
-        Create connection to the specified port.
+        Create connection to the specified port and emits the "port_connected"
+        signal from the parent node graph.
 
         Args:
             port (NodeGraphQt.Port): port object.
@@ -170,7 +171,8 @@ def connect_to(self, port=None):
 
     def disconnect_from(self, port=None):
         """
-        Disconnect from the specified port.
+        Disconnect from the specified port and emits the "port_disconnected"
+        signal from the parent node graph.
 
         Args:
             port (NodeGraphQt.Port): port object.
@@ -179,3 +181,6 @@ def disconnect_from(self, port=None):
             return
         graph = self.node().graph
         graph.undo_stack().push(PortDisconnectedCmd(self, port))
+
+        # emit "port_disconnected" signal from the parent graph.
+        graph.port_disconnected.emit(self, port)

NodeGraphQt/constants.py

@@ -1,7 +1,10 @@
 #!/usr/bin/python
 # -*- coding: utf-8 -*-
 import os
+from .pkg_info import __version__
 
+#: Version of the NodeGraphQt framework.
+VERSION = __version__
 
 # === PIPE ===