This is a work in progress widget I'm working on in my spare time, as a learning exercise on how to write a custom node graph in PySide.

NodeGraphQt is node graph widget that can be implemented and repurposed into vfx applications that supports PySide.

zoom in/out : Right Mouse Click + Drag or Mouse Scroll Up/Mouse Scroll Down
pan scene : Middle Mouse Click + Drag or Alt + Left Mouse Click + Drag
fit to screen : F

select all nodes : Ctrl + A
delete selected node(s) : Backspace or Delete
copy node(s): Ctrl + C (copy to clipboard)
paste node(s): Ctrl + V (paste from clipboard)
duplicate node(s) : Alt + C
save node layout : Ctrl + S
open node layout : Ctrl + O
undo action: Ctrl+z or Command+z (OSX)
redo action: Ctrl+Shift+z or Command+Shift+z (OSX)
toggle node (enable/disable): d

from NodeGraphQt.interfaces import NodeGraphWidget, Node

# define a node object
class MyNode(Node):
    """This is a example test node."""
    NODE_TYPE = 'MyNode'

    def __init__(self):
        super(MyNode, self).__init__()
        self.set_name('foo node')
        self.set_color(81, 54, 88)
        self.add_input('in')
        self.add_output('out')

# create a node
my_node = MyNode()

# create node graph.
graph = NodeGraphWidget()

# add node to the node graph.
graph.add_node(my_node)

graph.show()

view example.py script