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On 11/21/20 9:24 AM Greg Ercolano wrote:
Holy crap, cool! Thanks Albrecht, I'll have to look closely at what you
did, it's the end of day here, but I just compiled this and it seems to
work fine.
As I wrote before, bringing it to the point:
(1) The group (ab_grp) around A + B and its resizable() A make B fixed
width.
(2) The invisible box "around" the border between B (ab_grp) and C as
the window's resizable() make both ab_grp and C resize.
(3) The resizing of ab_grp and C is distributed proportionally to the
overlapping widths of the invisible box (box_i) with ab_grp and C,
respectively. If we choose the overlap width equal on both sides, they
resize evenly.
(4) Since box B is fixed width, the resizing of ab_grp is applied to box
A and this makes the whole interface resize symmetrically.
I modified the source code to make it shorter (removed the globals) and
adjusted box sizes slightly. I also added a size_range() to achieve a
well-defined minimal window size. See attached 3rd version of 'r.cxx'.
This technique should be woven into the resizable()
article, I'll see if I can do that too, unless you want to. Don't want
to loose this valuable info..
I'd appreciate if you could do this. I'm not that good at writing docs
and I'm currently busy developing other FLTK stuff and trying to fix
STR's and issues.
The demo program could also be added to the examples folder with
appropriate comments or perhaps included in the resizing chapter of the
docs.
On Friday, November 20, 2020 at 5:31:49 PM UTC-8 Albrecht Schlosser wrote:
On 11/21/20 1:29 AM Greg Ercolano wrote:
> On 2020-11-20 15:22, Albrecht Schlosser wrote:
>>
>> I started with Ian's code and tried my idea but it doesn't seem
to work
>> as requested. Maybe the position and size of this invisible box
(box_i)
>> can be changed to get the correct relations but I don't know.
Would need
>> to look into the resizing code to see how the relations are
calculated
>> (but not tonight).
I couldn't resist and did it...
;-
>> See attached file r.cxx.
>
> Thanks -- yes, I just don't think it's possible to keep B
centered doing any of the resizable
> tricks we're normally used to.
Well, it *is* possible! :-)
See attached new version of 'r.cxx'. Running it and resizing makes the
layout look familiar - like test/cube.cxx which I know was the reason
you asked. ;-)
The "secret" (revealed by a little math and the code in
Fl_Group::resize()) is to put the invisible box centered over the
border
between the two boxes B and C. As long as the overlap is equal on both
sides the two boxes (ab_grp and box_c) resize by the same amount and
therefore A and C resize symmetrically.
For simplicity I made all the boxes adjacent with widths 200, 100, 200,
resp. and put the invisible box on x = 250 with width = 100 (50 left of
the border and 50 right of the border). That's it!
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