bruno@bdblues.altair.fr (Bruno Poyet) (07/18/90)
A Transparent Composite Widget Class
------------------------------------
I whish I could have two transparent bulletinboard widgets B1 and B2,
meaning that if I put B1 and B2 in a normal bulletinboard I can see
both the children widgets of B1 and B2. Is it possible ?
Bruno POYET
I.N.R.I.A.
Francerlh2@ukc.ac.uk (Richard Hesketh) (07/20/90)
In article <9007191732.AA14355@hpcvxben.HP.COM> ben@HPCVXBEN.CV.HP.COM (Benjamin Ellsworth) writes: > >> A Transparent Composite Widget Class >I suppose that just about anything is possible, but what you're asking >for would be very, very hard to do. Why is it very hard? It you make the backgroundPixmap of the bulletin board "None" then you should get a transparent composite widget? However, you will have to unmap and map it everytime you get an expose event (ignoring the expose event that this unmap/map generates) or if the overrlapped widgets are changed. Is this what you mean by hard? I have used this technique to display greyed out command widgets (sensitive == FALSE) and overlay them with a transparent window that still accepts events, this proved extremely easy to implement. I have someone who wants to draw shapes in separate windows (for clipping and ease of manipulation) and overlay them, he could do this using a display postscript or shape extension .. but who wants to be tied to a particular server??? Are not windows without backgrounds available on all servers? Richard Hesketh : @nsfnet-relay.ac.uk:rlh2@ukc.ac.uk : rlh2@ukc.ac.uk ..!mcsun!ukc!rlh2 --- Computing Lab., University of Kent at Canterbury, Canterbury, Kent, CT2 7NF, United Kingdom. Tel: +44 227 764000 ext 7620/3682
ben@HPCVXBEN.CV.HP.COM (Benjamin Ellsworth) (07/21/90)
> Why is it very hard? ...[proposed approach]...
OK, try it. I don't really know what it may involve, and I really
don't have time to look closely. It is my opinion (and not HP's), as
one familiar with the widget set, that it will be very difficult to get
a completely functional transparent bulletin board. I would be pleased
if you would prove me wrong.
It may be easier to make up a composite (acutally subclass of manager)
which plays nicely with rest of the motif widgets, but I still believe
the task to be non-trivial (lots of niggling details). Again, I would
be pleased if you would prove me wrong.
-----------------------------------------------------------------------
Benjamin Ellsworth | ben@cv.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.
-----------------------------------------------------------------------