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On 10/2/22 15:01, Gonzalo Garramuno wrote:
I have used Fl_Pack in the past and I always
struggle with its behavior.
It's probably not the right fit for what you want, due to how it
shrink-wraps
itself around the gl group after you hide the red group, causing
the gl group
to remain its previous size, instead of expanding to fit.
From the Fl_Pack docs, I believe it's the red text that is I
think what's defeating you here:
This widget was designed to add the functionality of
compressing and aligning widgets.
If type() is
Fl_Pack::HORIZONTAL all the children are resized to the
height of the Fl_Pack,
and are moved next to each other horizontally. [..] Then the Fl_Pack
resizes itself to surround the child widgets.
..which is why when you hide the red group, the gl group doesn't
enlarge,
but instead Fl_Pack shrinks around it.
The reason for that behavior is the intended use inside an
Fl_Scroll, where the
pack would be the immediate child, so that the scrollbars adjust
automatically
when a widget in the pack is removed/hidden.
I'm thinking for your simple widget arrangement, it might be
easiest to not use
an Fl_Pack group at all, just use a regular group, using your
existing show/hide
toggle for the red box, and just add a line to resize() the gl
window to either full
or 1/2 it's parent's group size to get the expansion behavior
you want.
You might be able to use Albrecht's new Fl_Flex widget
(new in 1.4.x) for this,
I'm not sure. He can probably advise.
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