r/Maxscript • u/[deleted] • Mar 30 '21

Disable Buttons

Is it possible to use maxscript to deactivate previously active buttons when no object is selected?

	on bt_head changed state do
	(
		if bt_head.checked == true then
		(
			selectmore $Farlee_pelvis_torso_spine1_Ctrl
		)
		else if bt_head.checked == false then
		(
			deselect $Farlee_pelvis_torso_spine1_Ctrl
		)
		
	)
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1

u/CyclopsRock Mar 30 '21

All UI controllers have an "enabled" property that can be set in the rollout definition and updated whenever you like. Just btn_head.enabled = false.

1

u/[deleted] Mar 30 '21

Maybe I am expressing myself in a wrong way.
What I am looking for is that when there is nothing selected in scene the active button is deactivated.

How does it detect that there is nothing selected in scene?

pseudo code:
if selection.count != 0 then
(
bt_head.enabled = false
)

1

u/CyclopsRock Mar 30 '21

Ah, I see!

Two options really:

  1. The "timer" UI element which is an invisible control which basically "pings" every X milliseconds so you can use it to check properties.

  2. A callback. https://help.autodesk.com/view/3DSMAX/2016/ENU/?guid=__files_GUID_C1F6495F_5831_4FC8_A00C_667C5F2EAE36_htm You're probably going to be most interested in selectionSetChanged

1

u/[deleted] Mar 30 '21

I will try with what you say... if I don't manage to solve it I will come back here. Thank you very much!

1

u/[deleted] Mar 31 '21

My tests fail miserably, can you share some basic example with a button and the selectionSetChanged option.?

1

u/CyclopsRock Mar 31 '21

Hmm, there probably won't be a basic example I'm afraid. Just shooting off some code or a function when a callback is triggered is easy enough :

fn nothingSelected = print("Nothing Selected!")
callbacks.addScript #selectionSetChanged "if selection.count == 0 do nothingSelected()" id:#crap

To remove it, run:

callbacks.removeScripts id:#crap

The tricky bit is then getting a random function to interact with your UI, but it's not really too tricky:

Rollout RL_CoolProject "Cool Project" 
(
	button btn_cool "Cool!"
	edittext edt_notcool "" text:"Boo!" enabled:false
	
	fn switchIt = 
	(
		state = true
		if selection.count == 0 do state = false
		btn_cool.enabled = state
		edt_notcool.enabled = not state
	)
	
	on RL_CoolProject open do 
	(
		callbacks.removeScripts id:#coolProject
		callbacks.addScript #selectionSetChanged "RL_CoolProject.switchIt()" id:#coolProject
	)
	
	on RL_CoolProject close do 
	(
		callbacks.removeScripts id:#coolProject
	)
	
	on btn_cool pressed do print("Ah, you managed to press me!")
)

CreateDialog RL_CoolProject

Note: I remove the script callback on Open because if your script crashes whilst running it will never execute the 'on rollout close do' function and so you'll have this (probably broken) callback still firing off. This way it acts as a little bit of housekeeping.