[news.eclipse.tools.gef] Re: Correct Layout Procedure?

["Daniel Rozeboom" <Daniel.Rozeboom@xxxxxxxxxxxxx>]

    The way I have it running right now, it seems to be working correctly. 
What I do here is I don't specify a height and width for the container (A); 
I just specify its location and -1, -1 for width and height using 
setLayoutConstraint(), and its parent has an XYLayout.  Then A and B have 
toolbar layouts, so they seem to resize themselves automatically - I never 
specify sizes for them.  The only place where I specify a size is in C, 
where I say setPreferredSize() with information from the model.  Is this the 
correct way to do this, or am I calling some methods I shouldn't be?  Also, 
are setLayoutConstraint() and setPreferredSize() basically equivalent 
operations for the XYLayout and ToolbarLayout, respectively?  Thanks in 
advance.

- Daniel

"Nhu Le" <nle.misc@xxxxxxxxx> wrote in message 
news:e948vv$d3l$1@xxxxxxxxxxxxxxxxxxxx
> The way I understand this is:  If you use a layout manager provided in 
> GEF, you don't have to calculate the preferred size because it is provided 
> to you.  Take a look at the source code of one of the layout manager and 
> look for getPreferredSize() for more information.  When you create your 
> own layout manager, however, you will have to calculate the minimum size 
> and the preferred size by yourself.
>
>
> Daniel Rozeboom wrote:
>> Hi there,
>>
>>     I have a situation where I have a container (A) that has children 
>> (B), each of which has children of its own (C).  The container (A) 
>> resides in a document which has an XYLayout, so when A is asked to 
>> refresh visuals, I call setLayoutConstraint on the parent with the 
>> preferred size.  However, does this preferred size need to be calculated 
>> manually from the children (B)?  Likewise, when each of the children (B) 
>> is in refreshVisuals, do they need to set a preferred dimension 
>> calculated manually using the sizes of their children (C)?
>>     What's the correct way to do this?  I'm wondering if GEF handles this 
>> for me, because right now I'm doing a bunch of calculations with insets 
>> and children's edit parts' figures' sizes and whatnot.  Basically I want 
>> A to be large enough to accomodate all of the figures of B, which are 
>> each in turn large enough to accomodate all of the figures of C, which 
>> are each sized on the basis of a model constraint.  Thanks in advance.
>>
>> - Daniel