floatSliderGrp HOW do I add a listener to the slider so as it moves you get updates?

[Geordie Martinez]

I have a floatSliderGrp that I need to spit back interactive updates
to the slider.
is there a callback or command that can watch the slider handle?

[Jesse Capper]

changeCommand is executed when the value is changed, and only once
after a drag of the slider.
dragCommand is executed repeatedly during the drag of the slider.

-----------
Code sample:

def slider_drag_callback(*args):
print 'Slider Dragged'

def value_change_callback(*args):
print 'Value Changed'

window = cmds.window()
cmds.columnLayout()
cmds.floatSliderGrp(label='Drag Callback', field=True, value=0,
dc=slider_drag_callback)
cmds.floatSliderGrp(label='Change Callback', field=True, value=0,
cc=value_change_callback)
cmds.showWindow(window)

On Apr 12, 11:31 am, Geordie Martinez <geordiemarti...@gmail.com>
wrote:

[Geordie Martinez]

AWESOME. thanks.

[Daz]

Heya

I'm working on something similar but I get strange error. Could any have a look at my piece of code too and let me know why I don't get call back of the value I put in to my slider?

import maya.cmds as cmds

def AlphaValue(SliderName,AlphaName):
if cmds.ls(sl=1,mat=1):
sel=cmds.ls(sl=1,mat=1)
for alpha in sel:
value=cmds.floatSliderGrp(SliderName,query= True,field=True)
print value
cmds.setAttr('%s.%s'%(alpha,AlphaName),value[0])

windowZ=cmds.window(title="Slider Test",w=350,h=250)
cmds.columnLayout(w=150,adj=True)
diffuseAmountSlider=cmds.floatSliderGrp(label="Zoom", field=True,dc='AlphaValue(diffuseAmountSlider,"diffuseColorAmount")',value=1,min=-0.001,max=1,pre=3)
cmds.showWindow(windowZ)

I cant break it no matter what I try :(

[Daz]

Solved. Not sure how it just stared to work after I retype it for 10x...

[Justin Israel]

Just a suggestion, but you may find it a lot easier to work with actual function objects, as opposed to passing a string for the callback, to be evaluated. When you pass a string it is not a closure and anything in there will get evaluated when it is executed. So you could change your callback to this (using one of my favorite python tools: functools.partial):

from functools import partial
callback = partial(AlphaValue, diffuseAmountSlider, "diffuseColorAmount")

the partial() function will take a function and its arguments and wrap them up into a single callable object, which you can then pass around. You could even pass more arguments to that new callable, which will be added onto the final call:

def colors(required, optional1=None, optional2=None):
print required, optional1, optional2

colorFunc = partial(colors, optional2='red')
colorFunc('green')
# green None red

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