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Is it possible (using only emacs-lisp) to find out if the current frame is maximized?

Not fullscreen, but maximized.

  • Here is one idea: (assq 'outer-size (frame-geometry)); (assq 'title-bar-size (frame-geometry)); and (assq 'tool-bar-size (frame-geometry)). See also: gnu.org/software/emacs/manual/html_node/elisp/Frame-Size.html – lawlist Jul 16 at 22:23
  • Did you try (eq (frame-parameter nil 'fullscreen) 'maximized)? See (elisp) Size Parameters. – Drew Jul 17 at 0:35
  • @Drew sadly, this appears to be not working in OSX (Emacs 27 Cocoa), it just returns nil whether it's maximized or not – iLemming Jul 17 at 4:24
  • @Drew I stand corrected: I just re-installed latest from master and (frame-parameter nil 'fullscreen) does return 'maximized. Maybe it was broken and fixed recently, or something else. Would you please post this as an answer? – iLemming Jul 17 at 4:49
  • Although the call of the question seeks a pure emacs-lisp solution, here is a link to an emacs-lisp function that incorporates an applescript to get the bounds of the selected frame. gist.github.com/d7000235c8510460079149ad25233f0d Assuming the user knows the dimensions of what a maximized frame would be, that can be compared to the output of the get-bounds function. – lawlist Jul 17 at 5:04
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This should work, as the test you want:

(eq (frame-parameter nil 'fullscreen) 'maximized)

See (elisp) Size Parameters.

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