Re: [BUG] ov property line height failed on lone length line when exceeded window width

[stardiviner <numbchild@gmail.com>]

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Eli Zaretskii <eliz@gnu.org> writes:

>> From: stardiviner <numbchild@gmail.com>
>> Cc: emacs-devel@gnu.org
>> Date: Thu, 04 Jun 2020 08:43:27 +0800
>> 
>> > In that case, this is the expected behavior: if the newline with the
>> > line-height property is not visible, the setting has no effect.  It is
>> > conceptually the same as having a tall character or image displayed on
>> > a line: if you then truncate the line so that the tall element is not
>> > visible, the line's height will be decreased to reflect what is
>> > actually on display.
>> 
>> I have a little kind of understand. Hmm, is there any workaround of this
>> situation? I want it to be displayed anyway. Change my code, or toggle some
>> options or something else?
>
> Can you describe what are you trying to accomplish, and for what
> purpose?  Maybe then we could propose a workaround.

I try to add overlay which is colorized blocks that have line-height based on
the org-agenda clocked time.

I hope the overlay can keep line-height even I split window get window width
decreased.

The core code is here:

#+begin_src emacs-lisp
;; Show Org Agenda tasks with heigh spacing based on clock time with `org-agenda-log-mode'.
;; work with org-agenda dispatcher [c] "Today Clocked Tasks" to view today's clocked tasks.
(defun org-agenda-clock-colorize-block ()
  "Set different line spacing based on clock time duration."
  (save-excursion
    (let* ((colors (cl-case (alist-get 'background-mode (frame-parameters))
		                 ('light
		                  (list "#F6B1C3" "#FFFF9D" "#BEEB9F" "#ADD5F7"))
		                 ('dark
		                  (list "#aa557f" "DarkGreen" "DarkSlateGray" "DarkSlateBlue"))))
           pos
           duration)
      (nconc colors colors)
      (goto-char (point-min))
      (while (setq pos (next-single-property-change (point) 'duration))
        (goto-char pos)
        (when (and (not (equal pos (point-at-eol)))
                   (setq duration (org-get-at-bol 'duration)))
          ;; larger duration bar height
          (let ((line-height (if (< duration 15) 1.0 (+ 0.5 (/ duration 30))))
                (ov (make-overlay (point-at-bol) (1+ (point-at-eol)))))
            (overlay-put ov 'face `(:background ,(car colors) :foreground "black"))
            (setq colors (cdr colors))
            (overlay-put ov 'line-height line-height)
            (overlay-put ov 'line-spacing (1- line-height))))))))

(add-hook 'org-agenda-finalize-hook #'org-agenda-clock-colorize-block)
#+end_src

Which I get this code originally from this URL
https://emacs-china.org/t/org-agenda/8679 (It's Chinese Emacs forum).

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[ stardiviner ]
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