I understand your email. As Doru has been saying, we need a way to specify where the nested elements should go when composing shapes. Currently I have unfortunately no solution.

The approach you can do right now, is the one taken by all the GUI framework that I know: encapsulate the label and the container with its nested element. Here is an example that you can get inspiration from:

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

| classes allClassElements v es enclosing label g1 back |
classes := RTShape withAllSubclasses.
allClassElements := OrderedCollection new.

v := RTView new.

classes do: [ :cls | 
es := RTBox elementsOn: cls methods.
es @ RTPopup.

back := (RTBox new color: Color blue) element.
RTNest new 
layout: RTGridLayout new;
on: back nest: es.

enclosing := (RTBox new color: Color transparent) element.
label := (RTLabel new text: #name) elementOn: cls.
g1 := RTGroup withAll: { label . back }.
RTNest new 
layout: RTVerticalLineLayout new alignCenter;
on: enclosing nest: g1.

enclosing @ RTDraggable.

v add: enclosing.
v add: back.
v addAll: es.
v add: label.

allClassElements add: enclosing.
].
RTFlowLayout on: allClassElements.
v 

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

Cheers,

Alexandre

On May 14, 2014, at 5:20 AM, Leo Perard <leo.perard@gmail.com> wrote:

Hi,

using Roassal2 I would like to get a box with some nested element on it and the box get a label above itself.

I tried this but it is not working

view := RTView new.

container := (RTVerticalCompositeShape new
shape1: RTLabel new;
shape2: (RTBox new color: (Color blue alpha: 0.5)))
elementOn: 'Container'.
els := RTEllipse new elementsOn: (1 to: 16).
view add: container; addAll: els.

RTNest new layout: RTGridLayout; on: container nest: els.

view @ RTDraggableView.
view open

As you can see the label is not move due to the resize of the box with the nest.

I do not use TRConstraint because I will have several boxes and if I apply a layout on them the label is not calculate in the size so I do not think this is a solution but RTNest on RTVerticalCompositeShape is. 

-- 
Cheers,
Leo Perard
University of Lille 1
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