23 Mar
2015
23 Mar
'15
6:34 p.m.
hi!
Actually no. Updating the visualization should be done by manipulating trachel shapes.
Roassal shapes are good to create elements. Once an element has been created, modifying
its shape should not result in an update of the visualization. Because there are some case
where one do not want this.
Modifying a visualization should be done by modifying trachel shapes. Or building
appropriate Roassal interactions.
I agree with you, this is not an easy things to grasp.
Cheers,
Alexandre
--
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Alexandre Bergel http://www.bergel.eu
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On Mar 20, 2015, at 7:35 PM, Jan B.
<bliznjan(a)fit.cvut.cz> wrote:
Yes, it fully works even in our app this way. Thank you.
Just to understand it correctly, is this avoiding of using update by getting
trachelShape just workaround of a problem with composite shapes, right?
Should update on composite shapes work in perfect world, and I could use it
without any possible problem, yes?
Jan
abergel wrote
Hi Jan,
Composite shapes could be a nasty beast. This is a part of Roassal for
which I am not even sure of which semantics if should have. So, we may
end-up in some corner, as you have explained.
However, we are luck here: this is a easy problem to solve.
The modification you wish to have, which is changing the label has to be
done directly on the trachel shape and _not_ the roassal shape.
Consider this slightly modified version of the script:
-=-=-=-=-=-=-=-=-=-=-=-=
compo := RTCompositeShape new.
compo add: (RTEllipse new size: [ :tupple | tupple third ]; color: Color
lightBlue).
compo add: (RTEllipse new size: [ :tupple | tupple second ]; color: Color
blue).
compo add: (RTLabel new text: [ :tupple | tupple first ]; color: Color
red).
"ADDED LINE to demonstrate it does not keep this layout: " compo vertical.
v := RTView new.
data := {{ 'hello' . 30 . 50 } . { 'World' . 20 . 70} }.
v addAll: (compo elementsOn: data).
RTHorizontalLineLayout new alignCenter; on: v elements.
v elements @ RTDraggable.
"ADDED LINE where I change labels text:" v elements do: [ :elem | |label|
label := elem trachelShape shapes third. label text: 'LABEL'. ].
v
-=-=-=-=-=-=-=-=-=-=-=-=
And just to make my email more entertaining, here is the screenshot:
Alexandre
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