Autodesk Maya project changed event (signal) - pyside

Question

I am writing a project manager for Maya in PySide. It's purpose is to navigate through projects contents for quick accessibility. So I would like it to rescan newly set project directory automaticaly. As far as I know, there is no event like "Project Changed" in maya ScriptJob command. Any advices would be appreciated!

Answer 1

You're right, as there is not any "Project Changed" event in Maya's scriptJob command, you have to somewhat hack this. The following answer implies modifying Maya's file. So, if you need to deploy your project manager on multiple computers, you'll also have to deploy modifications made on Maya's files.
There might be an easier solution, but couldn't found out how to do it efficiently using the existing events.
Note:
I'm using Maya 2014, so change the path provided according to your actual version.
Solution 1 - PyMel based:
Goto C:\Program Files\Autodesk\Maya2014\Python\Lib\site-packages\pymel\core
Open system.py in your favorite editor
Search for the Workspace class (#547 in my system.py)
Edit the chdir function (#621):
#classmethod
def chdir(self, newdir):
_OpenMaya.MUserEventMessage.postUserEvent('ProjectChanged')
return cmds.workspace( dir=newdir )
Open a new Maya (Maya needs to be restarted so the modifications are effective)
Run this code in your script editor:
import maya.OpenMaya as om
#Register a new event (IE: Tell maya that this event really exists)
om.MUserEventMessage.registerUserEvent('ProjectChanged')
from pymel.all import *
#This function will be called when the project will be changed
#Do your real stuff inside
def myCallbackFunction(data):
print('Got a ChangedProject event!')
#Tell Maya to run myCallbackFunction when ProjectCHanged occurs
callbackId = om.MUserEventMessage.addUserEventCallback('ProjectChanged', myCallbackFunction)
#Whange your project directory:
# - The ProjectChanged signal will be sent
# - Maya will catch it and execute myCallbackFunction
# - This will print 'Got a ChangedProject event!'
workspace.chdir(r"C:\Users\dhasselhoff\Documents\maya\projects\hookedonafeeling")
If you want to remove the callback function when done: om.MUserEventMessage.removeCallback(callbackId)
Solution 2 - MEL based:
Goto C:\Program Files\Autodesk\Maya2014\scripts\others
Open setProject.mel in your favorite editor
Edit the setProject function (#359):
...
// Restore the current directory. The project may have changed, but the cur dir
// need not
workspace -dir $oldCurrentDir;
python("import maya.OpenMaya as om\nom.MUserEventMessage.postUserEvent('ProjectChanged')");
}
// Try to set it directly from the name given
else
{
sp_setLocalWorkspaceWithoutPopupDialog $newProject;
python("import maya.OpenMaya as om\nom.MUserEventMessage.postUserEvent('ProjectChanged')");
}
Open a new Maya (Maya needs to be restarted so the modifications are effective)
Run this code in your script editor:
import maya.OpenMaya as om
#Register a new event (IE: Tell maya that this event really exists)
om.MUserEventMessage.registerUserEvent('ProjectChanged')
#This function will be called when the project will be changed
#Do your real stuff inside
def myCallbackFunction(data):
print('Got a ChangedProject event!')
#Tell Maya to run myCallbackFunction when ProjectCHanged occurs
callbackId = om.MUserEventMessage.addUserEventCallback('ProjectChanged', myCallbackFunction)
#Whange your project directory:
# - The ProjectChanged signal will be sent
# - Maya will catch it and execute myCallbackFunction
# - This will print 'Got a ChangedProject event!'
mel.eval('setProject("C:\Users\dhasselhoff\Documents\maya\projects\hookedonafeeling");')
If you want to remove the callback function when done: om.MUserEventMessage.removeCallback(callbackId)