implemented port locking.

NodeGraphQt/base/model.py

@@ -19,6 +19,7 @@ def __init__(self, node):
         self.display_name = True
         self.multi_connection = False
         self.visible = True
+        self.locked = False
         self.connected_ports = defaultdict(list)
         self.data_type = 'NoneType'
 

NodeGraphQt/base/node.py

@@ -798,7 +798,8 @@ def add_checkbox(self, name, label='', text='', state=False, tab=None):
         self.view.add_widget(widget)
 
     def add_input(self, name='input', multi_input=False, display_name=True,
-                  color=None, data_type='NoneType', painter_func=None):
+                  color=None, data_type='NoneType', locked=False,
+                  painter_func=None):
         """
         Add input :class:`Port` to node.
 
@@ -808,6 +809,7 @@ def add_input(self, name='input', multi_input=False, display_name=True,
             display_name (bool): display the port name on the node.
             color (tuple): initial port color (r, g, b) ``0-255``.
             data_type (str): port data type name.
+            locked (bool): locked state see :meth:`Port.set_locked`
             painter_func (function): custom function to override the drawing
                 of the port shape see example: :ref:`Creating Custom Shapes`
 
@@ -818,7 +820,7 @@ def add_input(self, name='input', multi_input=False, display_name=True,
             raise PortRegistrationError(
                 'port name "{}" already registered.'.format(name))
 
-        port_args = [name, multi_input, display_name]
+        port_args = [name, multi_input, display_name, locked]
         if painter_func and callable(painter_func):
             port_args.append(painter_func)
         view = self.view.add_input(*port_args)
@@ -833,12 +835,14 @@ def add_input(self, name='input', multi_input=False, display_name=True,
         port.model.display_name = display_name
         port.model.multi_connection = multi_input
         port.model.data_type = data_type
+        port.model.locked = locked
         self._inputs.append(port)
         self.model.inputs[port.name()] = port.model
         return port
 
     def add_output(self, name='output', multi_output=True, display_name=True,
-                   color=None, data_type='NoneType', painter_func=None):
+                   color=None, data_type='NoneType', locked=False,
+                   painter_func=None):
         """
         Add output :class:`Port` to node.
 
@@ -848,6 +852,7 @@ def add_output(self, name='output', multi_output=True, display_name=True,
             display_name (bool): display the port name on the node.
             color (tuple): initial port color (r, g, b) ``0-255``.
             data_type(str): port data type name.
+            locked (bool): locked state see :meth:`Port.set_locked`
             painter_func (function): custom function to override the drawing
                 of the port shape see example: :ref:`Creating Custom Shapes`
 
@@ -858,7 +863,7 @@ def add_output(self, name='output', multi_output=True, display_name=True,
             raise PortRegistrationError(
                 'port name "{}" already registered.'.format(name))
 
-        port_args = [name, multi_output, display_name]
+        port_args = [name, multi_output, display_name, locked]
         if painter_func and callable(painter_func):
             port_args.append(painter_func)
         view = self.view.add_output(*port_args)
@@ -872,6 +877,7 @@ def add_output(self, name='output', multi_output=True, display_name=True,
         port.model.display_name = display_name
         port.model.multi_connection = multi_output
         port.model.data_type = data_type
+        port.model.locked = locked
         self._outputs.append(port)
         self.model.outputs[port.name()] = port.model
         return port

NodeGraphQt/base/port.py

@@ -102,6 +102,15 @@ def visible(self):
         """
         return self.model.visible
 
+    def locked(self):
+        """
+        Port locked state.
+
+        Returns:
+            bool: true if visible.
+        """
+        return self.model.locked
+
     def set_visible(self, visible=True):
         """
         Sets weather the port should be visible or not.
@@ -120,6 +129,21 @@ def set_visible(self, visible=True):
         undo_stack.push(PortVisibleCmd(self))
         undo_stack.endMacro()
 
+    def set_locked(self, locked=False):
+        """
+        Sets the port locked state when locked new pipe connections can't be
+        connected or disconnected from the node graph gui.
+
+        Note:
+            pipes can still be connected/disconnected to locked ports through
+            the api.
+
+        Args:
+            locked (Bool): true if locked.
+        """
+        self.model.locked = locked
+        self.__view.locked = locked
+
     def connected_ports(self):
         """
         Returns all connected ports.

NodeGraphQt/qgraphics/node_base.py

@@ -692,7 +692,7 @@ def _add_port(self, port):
         return port
 
     def add_input(self, name='input', multi_port=False, display_name=True,
-                  painter_func=None):
+                  locked=False, painter_func=None):
         """
         Adds a port qgraphics item into the node with the "port_type" set as
         IN_PORT.
@@ -701,6 +701,7 @@ def add_input(self, name='input', multi_port=False, display_name=True,
             name (str): name for the port.
             multi_port (bool): allow multiple connections.
             display_name (bool): display the port name.
+            locked (bool): locked state.
             painter_func (function): custom paint function.
 
         Returns:
@@ -714,10 +715,11 @@ def add_input(self, name='input', multi_port=False, display_name=True,
         port.port_type = IN_PORT
         port.multi_connection = multi_port
         port.display_name = display_name
+        port.locked = locked
         return self._add_port(port)
 
     def add_output(self, name='output', multi_port=False, display_name=True,
-                   painter_func=None):
+                   locked=False, painter_func=None):
         """
         Adds a port qgraphics item into the node with the "port_type" set as
         OUT_PORT.
@@ -726,6 +728,7 @@ def add_output(self, name='output', multi_port=False, display_name=True,
             name (str): name for the port.
             multi_port (bool): allow multiple connections.
             display_name (bool): display the port name.
+            locked (bool): locked state.
             painter_func (function): custom paint function.
 
         Returns:
@@ -739,6 +742,7 @@ def add_output(self, name='output', multi_port=False, display_name=True,
         port.port_type = OUT_PORT
         port.multi_connection = multi_port
         port.display_name = display_name
+        port.locked = locked
         return self._add_port(port)
 
     def _delete_port(self, port, text):

NodeGraphQt/qgraphics/port.py

@@ -37,6 +37,7 @@ def __init__(self, parent=None):
         self._border_size = 1
         self._port_type = None
         self._multi_connection = False
+        self._locked = False
 
         self.setCacheMode(ITEM_CACHE_MODE)
 
@@ -222,6 +223,19 @@ def border_size(self):
     def border_size(self, size=2):
         self._border_size = size
 
+    @property
+    def locked(self):
+        return self._locked
+
+    @locked.setter
+    def locked(self, value=False):
+        self._locked = value
+        conn_type = 'multi' if self.multi_connection else 'single'
+        tooltip = '{}: ({})'.format(self.name, conn_type)
+        if value:
+            tooltip += ' (L)'
+        self.setToolTip(tooltip)
+
     @property
     def multi_connection(self):
         return self._multi_connection

NodeGraphQt/widgets/viewer.py

@@ -186,11 +186,13 @@ def _on_search_submitted(self, node_type):
         self.search_triggered.emit(node_type, (pos.x(), pos.y()))
 
     def _on_pipes_sliced(self, path):
-        self.connection_sliced.emit([
-            [i.input_port, i.output_port]
-            for i in self.scene().items(path)
-            if isinstance(i, Pipe) and i != self._LIVE_PIPE
-        ])
+        ports = []
+        for i in self.scene().items(path):
+            if isinstance(i, Pipe) and i != self._LIVE_PIPE:
+                if any([i.input_port.locked, i.output_port.locked]):
+                    continue
+                ports.append([i.input_port, i.output_port])
+        self.connection_sliced.emit(ports)
 
     # --- reimplemented events ---
 
@@ -534,9 +536,11 @@ def sceneMousePressEvent(self, event):
         # pipe slicer enabled.
         if self.ALT_state and self.SHIFT_state:
             return
+
         # viewer pan mode.
         if self.ALT_state:
             return
+
         if self._LIVE_PIPE.isVisible():
             self.apply_live_connection(event)
             return
@@ -545,6 +549,10 @@ def sceneMousePressEvent(self, event):
         port_items = self._items_near(pos, PortItem, 5, 5)
         if port_items and self.editable:
             port = port_items[0]
+
+            if port.locked:
+                return
+
             if not port.multi_connection and port.connected_ports:
                 self._detached_port = port.connected_ports[0]
             self.start_live_connection(port)
@@ -573,6 +581,10 @@ def sceneMousePressEvent(self, event):
                 return
             pipe = pipe_items[0]
             from_port = pipe.port_from_pos(pos, True)
+
+            if from_port.locked:
+                return
+
             from_port.hovered = True
 
             attr = {IN_PORT: 'output_port', OUT_PORT: 'input_port'}
@@ -648,6 +660,8 @@ def apply_live_connection(self, event):
 
         # restore connection check.
         restore_connection = any([
+            # if the end port is locked.
+            end_port.locked,
             # if same port type.
             end_port.port_type == self._start_port.port_type,
             # if connection to itself.