Re: [MACTCL] Loops in ArrangePacking

[James B. <jk...@mr...>]

In poor style I'll follow up on my own message...

iwidgets/tabnotebook.itk sets the default padx and pady to be 4. Older Tk
releases didn't have a -padx option on frames, but I think this must have been 
added in 8.4.

Hence the frame (iwidgets "hull") gets padx 4 and pady 4, which implies that
the size of the canvas embedded within it is not the same. This causes a loop
due to the rather strange _resize function:

# -------------------------------------------------------------
# PRIVATE METHOD: _resize
#
# This method added by csmith, 5/1/01, to fix a bug with the
# geometry of the tabnotebook.  The hull component's geometry
# was not being updated properly on <Configure> events.
# -------------------------------------------------------------
body iwidgets::Tabnotebook::_resize {newWidth_ newHeight_} {
  _canvasReconfigure $newWidth_ $newHeight_
  update idletasks
  component hull configure -width $newWidth_ -height $newHeight_
}

The solution is obvious - just configure the hull to be -padx 0 -pady 0.
This still looks like a dangerous approach.

Anyway, this is clearly a iwidgets bug, but what's got me wondering now is
whether this happens on Unix. I've never noticed it before, but I'm not
running with 8.4 yet on unix so I that would avoid the issue.

Sorry to cause any alarm :) I'll submit this as an iwidgets bug.

James

-- 
James Bonfield (jk...@mr...)   Fax: (+44) 01223 213556
Medical Research Council - Laboratory of Molecular Biology,
Hills Road, Cambridge, CB2 2QH, England.
Also see Staden Package WWW site at http://www.mrc-lmb.cam.ac.uk/pubseq/