I have cleaned a bit your code with something like:

doExecute: nodeElements
        self start: nodeElements.
        self isJobInstalled
                ifTrue: [ self runLayoutInJob ]
                ifFalse: [ self runLayoutSimply ].
        alpha := 0.
        nodes do: [ :e | translator translateTopLeftOf: e to: e position ]

It is in version .816 of Roassal2.

We should be able to run the layout without job. This is important for us

Thanks!
Alexandre


> On Apr 7, 2015, at 5:04 PM, Peter Uhnák <i.uhnak@gmail.com> wrote:
>

> Out of curiosity I dug a little deeper and was happy to learn about a Job and more about Pharo internals.
>
> In any case, try replacing RTForceBasedLayout>>doExecute: with this
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~
> doExecute: nodeElements
>       self start: nodeElements.
>       [ :job |
>               job
>                       title: 'Laying out elements';
>                       min: 1 - alpha;
>                       max: 1.
>               nbIterations = 0
>                       ifTrue: [ [ alpha := alpha * 0.99. alpha > 0.005 ] whileTrue: [ self step. job currentValue: 1 - alpha ] ]
>                       ifFalse: [ nbIterations timesRepeat: [ alpha := alpha * 0.99. self step. job currentValue: 1 - alpha ] ]
>       ] asJob run.
>       alpha := 0.
>       nodes do: [ :e | translator translateTopLeftOf: e to: e position ].
> ~~~~~~~~~~~~~~~~~~~~~~~~~
>
> it's bit messy (and doesn't account for nbIterations), but its a proof of concept.
>
>
> I thing that it makes sense to create execution indicator without progress (with spinner for example)
>
> What can be done is to display alpha on progress bar. From current value to 0.005 or whatever there is.
> I was thinking more something like this http://www.barchart.com/shared/images/progress_bar.gif or thsi https://i.stack.imgur.com/gz9GK.gif
>
> Peter

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Alexandre Bergel  http://www.bergel.eu
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