3 Jul
2014
3 Jul
'14
8:58 p.m.
Hi Leo,
Yes, a Roassal is shared by all the elements. For the same reason that a “class” is the
same for all the instances of that class.
If you want to change some visual attribute to an element, you should do it via its
trachelShape. At the end, everything boil down into Trachel, which is a thin layer on top
of Athens.
Alexandre
--
_,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:
Alexandre Bergel http://www.bergel.eu
^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
On Jul 2, 2014, at 6:06 PM, Leo Perard <leo.perard(a)gmail.com> wrote:
I understand that a shape is shared by elements but
what I do not is why ?
For example
shape := RTBox new color: Color red.
els := shape elementsOn: (1 to: 10).
els do: [ :e |
e on: TRMouseLeftClick do: [ :event | e shape color: Color random. e update. view
signalUpdate ].
e on: TRMouseRightClick do: [ :event | e shape borderColor: Color random. e update. view
signalUpdate ]
]
In this example if I change an element with a left click its color will change so it is
ok.
But after, I change the border color wiht a right click, the border will be change AND
the color too. But I did not want that, just the border.
Do you see my point ? I do not understant why shape should be shared ?
On Wed, Jul 2, 2014 at 10:26 PM, Alexandre Bergel <alexandre.bergel(a)me.com> wrote:
Hi Leo,
Sorry to reply so late.
Your script does exactly what it is supposed to do. Maybe part of the shape semantic is
not clear.
Consider this part of the script:
e on: TRMouseClick do: [ :event |
e shape color: Color random. e update. els atRandom update. view
signalUpdate ]
You click on an element e, which means you change the shape of the element. You update
the element itself, it therefore changes its color. But with "els atRandom update”
you also update another element. Since the shape is shared by all the elements, the
behavior is indeed correct.
A shape is shared with all the objects. What is not shared are Trachel shapes.
You have the following relations:
shape := RTBox new size: 10.
e1 := shape elementOn: 'hello'.
e2 := shape elementOn: 'world'.
self assert: e1 shape == e2 shape.
self assert: e1 shape ~~ e1 trachelShape.
self assert: (e1 shape isKindOf: RTBox).
self assert: (e1 trachelShape isKindOf: TRBoxShape).
self assert: e1 trachelShape ~~ e2 trachelShape.
Let me know if something is not clear. I have written this in the class comment of
RTShape.
Cheers,
Alexandre
--
_,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:
Alexandre Bergel http://www.bergel.eu
^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
On Jun 25, 2014, at 5:37 AM, Leo Perard <leo.perard(a)gmail.com> wrote:
Hi,
I'm not sure it is but I think I have found a bug where elements share the same
instance of a shape.
Here an example:
view := RTView new.
els := (RTBox new size: 20) elementsOn: (1 to: 10).
view addAll: els.
els do: [ :e |
e on: TRMouseClick do: [ :event |
e shape color: Color random. e update. els atRandom update. view
signalUpdate ]
].
RTHorizontalLineLayout on: els.
view open
It should only change the color of one element but it doesn't.
So I don't know if it is wanted or not.
--
Cheers,
Leo Perard
University of Lille 1
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--
Cheers,
Leo Perard
University of Lille 1
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