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09:05
How to expand ImageSize vertically to fill all available space?
Manually heights are 400 and 100 but I would like to have TakeAll and All:
Framed[
 Column[{
   Framed["body", ImageSize -> {Full, 400}, ImageMargins -> -.5],
   Framed["footer", ImageSize -> {Full, 100},
    Alignment -> {Left, Bottom}, ImageMargins -> -.5]},
  Alignment -> {Top, Bottom}, Spacings -> 0],
 ImageSize -> {500, 500},
 Alignment -> {Left, Top}, FrameMargins -> 0]
Full takes all vertical space form the parent so that's to much.
 
10 hours later…
18:56
@Kuba If you know the relative proportions Scaled works (e.g. Scaled[.9] and Scaled[.1]) but I'm not sure if there's a sense of "remaining" space in Mathematica's windowing system beyond something constructed via Dynamic
19:19
@b3m2a1 parent's size is fixed 500x500 so remaining makes sense.
20:06
Agreed that it makes sense, but I think the Mathematica front-end is missing the necessary CSS-like flex constructions although you might be able to get a pure FE solution with some box-size trickery...

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