Re: Change `set-frame-font' to allow keeping of frame size

[Ehud Karni]

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On Sun, 06 Apr 2003 19:07:36 -0400, Richard Stallman <address@hidden> wrote:
> 
>       (defun set-frame-font (font-name)

Sorry, the 2nd arg was omitted on copying (I tested this defun).

> Whether this is a good change, I am not sure.  I do not understand the
> description of the feature.  What does it mean to "keep the current
> size"?  And what is the other alternative?

The "Keep size" means keeping the pixel size (its footprint on the
screen) of the frame. From your question it is clear that the wording
should be changed to clarify this. How about:

(defun set-frame-font (font-name keep-size)
  "Set the font of the selected frame to FONT-NAME.
When called interactively, prompt for the name of the font to use.
To get the frame's current default font, use `frame-parameters'.
If optional KEEP-SIZE is non nil the current frame size (in pixels)
is kept by adjusting the frame `height' and `width' parameters"
  (interactive
   (let* ((completion-ignore-case t)
          (font (completing-read "Font name: "
                         (mapcar #'list
                                 ;; x-list-fonts will fail with an error
                                 ;; if this frame doesn't support fonts.
                                 (x-list-fonts "*" nil (selected-frame)))))
          (keep (yes-or-no-p
                 "Keep the frame size (in pixels) after changing font ? ")))
     (list font keep)))
  (let (fht fwd)
    (if keep-size
        (setq fht (* (frame-parameter nil 'height) (frame-char-height))
              fwd (* (frame-parameter nil 'width)  (frame-char-width))))
    (modify-frame-parameters (selected-frame)
                             (list (cons 'font font-name)))
    (if keep-size
        (modify-frame-parameters
         (selected-frame)
         (list (cons 'height (round fht (frame-char-height)))
               (cons 'width (round fwd (frame-char-width)))))))
  (run-hooks 'after-setting-font-hook 'after-setting-font-hooks))


Ehud.


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