Commit 82e6d8cb authored by Richard M. Stallman's avatar Richard M. Stallman
Browse files

(one-window-p, walk-windows, minibuffer-window-active-p): Functions moved here.

parent b1aa6cb3
......@@ -22,6 +22,70 @@
;;; Code:
;;;; Window tree functions.
(defun one-window-p (&optional nomini all-frames)
"Returns non-nil if the selected window is the only window (in its frame).
Optional arg NOMINI non-nil means don't count the minibuffer
even if it is active.
The optional arg ALL-FRAMES t means count windows on all frames.
If it is `visible', count windows on all visible frames.
ALL-FRAMES nil or omitted means count only the selected frame,
plus the minibuffer it uses (which may be on another frame).
If ALL-FRAMES is neither nil nor t, count only the selected frame."
(let ((base-window (selected-window)))
(if (and nomini (eq base-window (minibuffer-window)))
(setq base-window (next-window base-window)))
(eq base-window
(next-window base-window (if nomini 'arg) all-frames))))
(defun walk-windows (proc &optional minibuf all-frames)
"Cycle through all visible windows, calling PROC for each one.
PROC is called with a window as argument.
Optional second arg MINIBUF t means count the minibuffer window even
if not active. MINIBUF nil or omitted means count the minibuffer iff
it is active. MINIBUF neither t nor nil means not to count the
minibuffer even if it is active.
Several frames may share a single minibuffer; if the minibuffer
counts, all windows on all frames that share that minibuffer count
too. Therefore, when a separate minibuffer frame is active,
`walk-windows' includes the windows in the frame from which you
entered the minibuffer, as well as the minibuffer window. But if the
minibuffer does not count, only windows from WINDOW's frame count.
Optional third arg ALL-FRAMES t means include windows on all frames.
ALL-FRAMES nil or omitted means cycle within the frames as specified
above. ALL-FRAMES = `visible' means include windows on all visible frames.
ALL-FRAMES = 0 means include windows on all visible and iconified frames.
Anything else means restrict to WINDOW's frame."
;; If we start from the minibuffer window, don't fail to come back to it.
(if (window-minibuffer-p (selected-window))
(setq minibuf t))
(let* ((walk-windows-start (selected-window))
(walk-windows-current walk-windows-start))
(while (progn
(setq walk-windows-current
(next-window walk-windows-current minibuf all-frames))
(funcall proc walk-windows-current)
(not (eq walk-windows-current walk-windows-start))))))
(defun minibuffer-window-active-p (window)
"Return t if WINDOW (a minibuffer window) is now active."
;; nil nil means include WINDOW's frame
;; and other frames using WINDOW as minibuffer,
;; and include minibuffer if active.
(let ((prev (previous-window window nil nil)))
;; If PREV equals WINDOW, WINDOW must be on a minibuffer-only frame
;; and it's not currently being used. So return nil.
(and (not (eq window prev))
(let ((should-be-same (next-window prev nil nil)))
;; If next-window doesn't reverse previous-window,
;; WINDOW must be outside the cycle specified by nil nil.
(eq should-be-same window)))))
(defun count-windows (&optional minibuf)
"Returns the number of visible windows.
Optional arg NO-MINI non-nil means don't count the minibuffer
......@@ -73,7 +137,7 @@ even if it is active."
(enlarge-window (- newsize
;;; I think this should be the default; I think people will prefer it--rms.
(defvar split-window-keep-point t
"*If non-nil, split windows keeps the original point in both children.
......@@ -133,7 +197,7 @@ No arg means split equally."
(and size (< size 0)
(setq size (+ (window-width) size)))
(split-window nil size t)))
(defun enlarge-window-horizontally (arg)
"Make current window ARG columns wider."
(interactive "p")
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