Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!hplabs!hp-pcd!hpcvlx!ben
From: ben@hpcvlx.HP.COM (Benjamin Ellsworth)
Newsgroups: comp.windows.x
Subject: Re: Parent <-> child communications in widget trees
Message-ID: <100920068@hpcvlx.HP.COM>
Date: 6 Apr 89 18:28:13 GMT
References: <12029@pasteur.Berkeley.EDU>
Organization: Hewlett-Packard Co., Corvallis, OR, USA
Lines: 24


> As I understand it, when a resize event happens, the composite widget
> is supposed to communicate with its children on what it intends to do
> with them. ...

As I understand it, the composite widget *may* choose to communicate
with its children and negotiate new geometries; however, the composite 
is under no obligation to do so.  Because the composite has no 
opportunity to negotiate with its parent during the processing of a 
"resize event", the algorithms for negotiating with children can become
quite unwieldly.  Hence, although it is provided for, few, if any, 
composites initiate geometry negotiations with their children during a 
resize.

The society of widgets is not as egalitarian as one might wish.

-----------------------------------------------------------------------
Benjamin Ellsworth      | ben%hp-pcd@hp-sde.sde.hp.com | INTERNET
Hewlett-Packard Company | {backbone}!hplabs!hp-pcd!ben | UUCP
1000 N.E. Circle        | (USA) (503) 750-4980         | FAX
Corvallis, OR 97330     | (USA) (503) 757-2000         | VOICE
-----------------------------------------------------------------------
                     All relevant disclaimers apply.
-----------------------------------------------------------------------