nodegraphhooks.py

import hou, os, sys
from PySide2 import QtCore
from canvaseventtypes import KeyboardEvent
import utility_hotkey_system
import nodegraphstates as states

this = sys.modules[__name__]

__userdir = hou.getenv('HOUDINI_USER_PREF_DIR')
__pythonlibs = os.path.join(__userdir, "python2.7libs")

def __reload_pythonlibs():
    print "Reloading libraries..."
    reload(this)
    reload(utility_hotkey_system)

fs_watcher = QtCore.QFileSystemWatcher()
fs_watcher.addPath(os.path.join(__pythonlibs, "nodegraphhooks.py"))
fs_watcher.addPath(os.path.join(__pythonlibs, "utility_hotkey_system.py"))
fs_watcher.fileChanged.connect(__reload_pythonlibs)


class MyBackgroundMouseHandler(base.EventHandler):
    def handleEvent(self, uievent, pending_actions):
        if isinstance(uievent, KeyboardEvent):
            print "it works"
            #utility_hotkey_system.invoke_action_from_key(uievent)
            return self

        if uievent.eventtype == 'mousedrag':
            if self.start_uievent.mousestate.lmb:
                return MyBoxPickHandler(self.start_uievent)

        if uievent.eventtype == 'mouseup':
            return None

        return self

# copy paste all the other cases with your own subclasses
class MyBoxPickHandler(states.BoxPickHandler):
    def handleEvent(self, uievent, pending_actions):
        if isinstance(uievent, KeyboardEvent):
            print "KEYBOARD 2"
            #utility_hotkey_system.invoke_action_from_key(uievent)
            return self
        else:
            return super(MyBoxPickHandler, self).handleEvent(uievent, pending_actions)
        return None

def createEventHandler(uievent, pending_actions):
    if not isinstance(uievent.editor, hou.NetworkEditor):
        return None, False

    if uievent.eventtype == 'mousedown':
        return MyBackgroundMouseHandler(uievent), True
    
    return None, False