Subject: Adjuster
Date: Wed, 16 Dec 1998 22:23:23 +0100
From: Stephen Kun <stephen.kun@is.gaertner.de>
To: Nick Ing-Simmons <nick@ni-s.u-net.com>




3. How do I find out whether slave is a pack or grid master or if it is not a 
master (for setting packPropagate(0))
Currently I set both on the slave.

4. In setting position of drag bar, I do a lot of calcs for each motion event.
Some could be done one for first, then used again for subsequent calls, eg:
borderwidth of master, etc.
I've now partially done this and store them on the widget.

5. Do I need XSync and idletasks calls in Adjuster.pm?
XSync causes a bug. idletasks doesn't make any difference in practice, from
what I can see. I've commented both out.
Bug when using XSync:
  Run pack_adj_4r
  Shorten whole window from right so that left window edge crosses leftmost
    adjuster. Buttons on other adjusters disappear

6. Sometimes the effect given by the Restore method, is undesirable. Eg.
for multi-columns. Then when you expand say the 1st column, the size of the
col at the end gets reduced to 0 width when the Adjuster forces itself in.
Then when you reduce the size of the first column again, the end col is still
0 width.
Better would be:
a) put the restore functionality on a flag OR
b) when a col is reduced because of a Restore, it saves previous width of
its slave, and attempts to restore it when the space becomes availabe. (Sounds
impracticable.)
I've implemented a) with default ON. In the documentation I'll recommend the
default for the 1st Adjuster, then OFF for the remaining.

8. What about a packAdjustForget? Given that Adjuster doesn't work well for
grid anyway, and doesn't consider other managers, that wouldn't be too bad.
I'm not going to do this, but someone mentioned it a while ago. I can
see me probably wanting it too at some point.
Are you for the idea?

10. Grid doesn't work well with Adjuster, didn't before either. I think
this has to do with grid, rather than adjuster. You get the same effect
if you grid a row of widgets, then reduce the width of the window.
Bugs demonstrated by grid_adj_4l:
a) there's never an Unmap event for the adjuster.
b) after adjusting, widgets protrude into border on right.
c) grid('Propagate', 0) on MainWindow has no effect - window shrinks/grows
   when widgets are adjusted
d) widgets shuffle to correct position on startup
I don't recommend use of grid with Adjust!

11. Have taken out __END__ temporarily for testing
Will put it back before publishing on the mailing list.

12. Why do the adjusters in my testcases come out grey? That's not the
default background.

13. Could packAdjust return ($adj, $w). Could then do:
    my $canv = $top->Canvas()->packAdjust();
OR
    my ($adj, $canv) = $top->Canvas()->packAdjust();
Latter is good if you want to configure or unpack adjuster later.
I realise this is very Kludgy, but there's no other way to get the
Adjuster from packAdjust.
I suppose the workaround of creating the Adjuster yourself is OK. When
you do it by hand though, there's more chance of making mistakes, eg
forgetting the -side (which defaults then to 'top') which would cause havoc.
What's your opinion.

14. Run the script adj_button_bug: You can't reduce size of button.
Button can be expanded, but as soon as focus enters button, it springs back
to its original size. Why?
It's not important though.
