diff options
Diffstat (limited to 'modules/music-config.el')
| -rw-r--r-- | modules/music-config.el | 40 |
1 files changed, 37 insertions, 3 deletions
diff --git a/modules/music-config.el b/modules/music-config.el index 10aa1019..e9095838 100644 --- a/modules/music-config.el +++ b/modules/music-config.el @@ -471,7 +471,10 @@ inserts or kills into one renumber pass." ;; motion walks the header's screen lines, which all map back to the ;; same buffer position, so arrows look dead). Rows are one logical ;; line each; visual movement buys nothing here. - (setq-local line-move-visual nil)) + (setq-local line-move-visual nil) + ;; Sticky header: re-anchor the header block at the window start on + ;; every scroll, so it stays frozen while the list scrolls under it. + (add-hook 'window-scroll-functions #'cj/music--stick-header nil t)) (cj/music--renumber-rows buffer) ;; Set this as the current EMMS playlist buffer (setq emms-playlist-buffer buffer) @@ -1392,14 +1395,45 @@ the controls." (cj/music--fancy-header) (cj/music--text-header))) +(defun cj/music--header-anchor-position () + "Return the position the header overlay should anchor at right now. +The start of the displaying window when the playlist is shown (so the +header stays at the top of the window while the list scrolls under it), +else the top of the buffer. Searches all frames -- the refresh timer can +run with any frame selected, and missing a window on another frame would +anchor at the buffer top and yank a scrolled header back." + (if-let ((win (get-buffer-window (current-buffer) t))) + (max (point-min) (min (window-start win) (point-max))) + (point-min))) + +(defun cj/music--stick-header (win start) + "Re-anchor the header overlay at START, WIN's new display start. +Runs on the buffer-local `window-scroll-functions', so every scroll pins +the header block to the top of the window and the track list scrolls +beneath it. Converges: an already-anchored header is a no-op, so the +redisplay this move triggers doesn't loop. Always returns nil." + (with-current-buffer (window-buffer win) + (when (and (overlayp cj/music--header-overlay) + (overlay-buffer cj/music--header-overlay) + (integer-or-marker-p start)) + (let ((pos (max (point-min) (min start (point-max))))) + (unless (= (overlay-start cj/music--header-overlay) pos) + (move-overlay cj/music--header-overlay pos pos)))) + nil)) + (defun cj/music--update-header () - "Insert or update the multi-line header overlay in the playlist buffer." + "Insert or update the multi-line header overlay in the playlist buffer. +Anchors at the displaying window's start (see +`cj/music--header-anchor-position') -- the refresh timer calls this every +second, and re-anchoring at the buffer top would yank the sticky header +away whenever the list is scrolled." (when-let ((buf (get-buffer cj/music-playlist-buffer-name))) (with-current-buffer buf (unless cj/music--header-overlay (setq cj/music--header-overlay (make-overlay (point-min) (point-min))) (overlay-put cj/music--header-overlay 'priority 100)) - (move-overlay cj/music--header-overlay (point-min) (point-min)) + (let ((pos (cj/music--header-anchor-position))) + (move-overlay cj/music--header-overlay pos pos)) (overlay-put cj/music--header-overlay 'before-string (cj/music--header-text))))) |