[Opensource] Réf. : [Opensource] Transition Proposal

[Thierry Clement]

>Hey All,

>A lot of people have requested the ability to disable or remove 
transitions 
>that a user doesn't have permissions to follow.

>I had been struggling on how best to do this, but I think I have a decent 

>idea :)

>The transition would have a new attribute called 'disabled'.  If a user 
>doesn't have permissions to follow a link, [which the transition itself 
>would determine], then the disabled attribute would be set to "true". 
>[Actually the mere presence of the disabled attribute would cause 
disabled 
>behavior]

>Now, if Transition.getUrl() is called on a disabled transition, the 
>transition will return "#" which effectively blocks its use.

>Secondly, the jsp page designed [at least using struts-based tags] can 
>check for the presence of the disabled attribute and either set the 
normal 
>css style or a disabled css style to gray out any link text.  And 
>furthermore if icons are used, the jsp designer would be able to swap out 

>"grayed out" icons rather than the normal one.

>I like this approach better than just not having the link available since 

>it lets the user know that the ability is there, but it is not active. 
>[most likely due to permissions, but a controller could also disable 
>certain actions as well using this format based upon certain criteria]

>What do you guys think?  This would go into Expresso 5.1 or later and 
would 
>not be in the bugfix release since it would mean changed controller 
behavior.

>Thanks for the feedback!
>                -Mike

I think it is interesting to let a user know that an information is 
present but disabled for writing (or accessing) by the means of a "gray" 
cell. I also wondered how to do this, and the way I imagined was to set an 
attribute such as "disabled", "readOnly", or smthg more general like 
"accessRights" on a Block containing the information (inputs, outputs 
and/or transitions) I want to "gray out". But it would be cleaner to have 
it as a special attribute of Transition (as you suggest) - I just suggest 
it could be extended for Inputs and Outputs, with corresponding 
modifications in the expresso:InputTag and expresso:OutputTag so that the 
information appears as "grayed".

If choosing a more general "accessRights" attribute, I suggest to use Unix 
convention, with values ranging from "" to "RWX" : an input with attribute 
"R" would just be displayed ; "RW" would allow modifications, "X" being 
used for enabling transitions... but may be I am going too far and such 
flexibility is not desired ?

Thierry
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