diff options
Diffstat (limited to 'modules/cj-window-geometry-lib.el')
| -rw-r--r-- | modules/cj-window-geometry-lib.el | 69 |
1 files changed, 58 insertions, 11 deletions
diff --git a/modules/cj-window-geometry-lib.el b/modules/cj-window-geometry-lib.el index 047fe7c45..4484a1d15 100644 --- a/modules/cj-window-geometry-lib.el +++ b/modules/cj-window-geometry-lib.el @@ -42,21 +42,34 @@ fails to span the full height." ((not spans-full-height) (if (= top root-top) 'above 'below)) (t (or default 'right))))) -(defun cj/window-body-size (window direction) - "Return WINDOW's body size on the axis matching DIRECTION. +(defun cj/window-replay-size (window direction) + "Return WINDOW's size to capture for geometry replay, on DIRECTION's axis. Returns body-width (columns) when DIRECTION is right or left. -Returns body-height (lines) when DIRECTION is below or above. - -Body size, not total size, is the right thing to capture for -geometry replay: total-width includes the right-side divider when -the window has a right sibling but excludes it at the frame edge, -so a captured rightmost window replayed into a middle position -would leave the body 1 col short. Body size is divider- -independent and matches what the user actually sees." +Returns total-height (lines) when DIRECTION is below or above. + +The axis choice is deliberately asymmetric, for two different reasons: + +- Width: body-width, not total-width. Total-width includes the right-side + divider when the window has a right sibling but excludes it at the frame + edge, so a captured rightmost window replayed into a middle position would + leave the body 1 col short. Body-width is divider-independent and matches + what the user sees. + +- Height: total-height, not body-height. Every window carries exactly one + mode line regardless of position, so total-height has no analog of the + divider-position problem -- it is position-independent. Body-height does + NOT work here: it subtracts the mode line's *pixel* height, which differs + between an active (full-height) and an inactive (theme-shrunk) mode line. + Capturing body-height while the window is active and replaying it while the + window is displayed inactive then re-measuring active drifts the value down + by ~1 line per toggle whenever the inactive mode line is shorter than a text + line (e.g. a theme that sets `mode-line-inactive' to a sub-line height). + Total-height is identical active or inactive, so the capture/replay + round-trip is a fixed point." (if (memq direction '(right left)) (window-body-width window) - (window-body-height window))) + (window-total-height window))) (defun cj/cardinal-to-edge-direction (direction) "Map cardinal DIRECTION to its `display-buffer-in-direction' edge variant. @@ -129,5 +142,39 @@ the fraction at toggle-off, replay it on the next toggle-on." (hi (or max-frac 0.95))) (max lo (min hi (/ (float window-size) frame-size)))))) +(defcustom cj/window-dock-min-columns 80 + "Minimum body columns each pane must keep for a side-by-side dock. + +`cj/preferred-dock-direction' docks a companion panel as a side-by-side +column only when both the panel and the main window would stay at least +this wide; otherwise it stacks the panel below. 80 is the classic +terminal/code width." + :type 'integer + :group 'windows) + +(defun cj/preferred-dock-direction (frame-cols fraction &optional min-cols) + "Return the dock direction for a companion panel beside the main window. + +Returns `right' (a side-by-side column) when a split that gives the panel +FRACTION of FRAME-COLS would leave both panes at least MIN-COLS columns +wide; otherwise `below' (a stacked panel). FRAME-COLS is the frame's +total column count; FRACTION is the panel's share of the width, in the +open interval (0, 1). MIN-COLS defaults to `cj/window-dock-min-columns'. + +The narrower of the two resulting panes governs: the panel takes +round(FRACTION * FRAME-COLS) columns, the main window takes the rest less +one divider column, and `right' is returned only when the smaller of the +two clears MIN-COLS. Returns `below' for degenerate input (non-positive +FRAME-COLS, or FRACTION outside (0, 1)) so a caller always gets a usable +stacked fallback." + (let ((min-cols (or min-cols cj/window-dock-min-columns))) + (if (and (numberp frame-cols) (> frame-cols 0) + (numberp fraction) (< 0 fraction 1)) + (let* ((panel (round (* fraction frame-cols))) + (main (- frame-cols panel 1)) + (narrower (min panel main))) + (if (>= narrower min-cols) 'right 'below)) + 'below))) + (provide 'cj-window-geometry-lib) ;;; cj-window-geometry-lib.el ends here |