;;; window.el --- GNU Emacs window commands aside from those written in C.
-;;; Copyright (C) 1985, 1989, 1992, 1993, 1994 Free Software Foundation, Inc.
+;; Copyright (C) 1985, 1989, 1992, 1993, 1994 Free Software Foundation, Inc.
;; Maintainer: FSF
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs; see the file COPYING. If not, write to
-;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+;; along with GNU Emacs; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
;;; 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.
+
+ALL-FRAMES is the optional third argument.
+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.
+ALL-FRAMES = t means include windows on all frames including invisible 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."
+ (eq window (active-minibuffer-window)))
+
+(defmacro save-selected-window (&rest body)
+ "Execute BODY, then select the window that was selected before BODY."
+ (list 'let
+ '((save-selected-window-window (selected-window)))
+ (list 'unwind-protect
+ (cons 'progn body)
+ (list 'select-window 'save-selected-window-window))))
+\f
(defun count-windows (&optional minibuf)
"Returns the number of visible windows.
Optional arg NO-MINI non-nil means don't count the minibuffer
(defun balance-windows ()
"Makes all visible windows the same height (approximately)."
(interactive)
- (let ((count -1) levels newsizes size)
+ (let ((count -1) levels newsizes size
+ ;; Don't count the lines that are above the uppermost windows.
+ ;; (These are the menu bar lines, if any.)
+ (mbl (nth 1 (window-edges (frame-first-window (selected-frame))))))
;; Find all the different vpos's at which windows start,
;; then count them. But ignore levels that differ by only 1.
(save-window-excursion
(setq tops (cdr tops)))
(setq count (1+ count))))
;; Subdivide the frame into that many vertical levels.
- (setq size (/ (frame-height) count))
+ (setq size (/ (- (frame-height) mbl) count))
(walk-windows (function
(lambda (w)
(select-window w)
count)))
(setq newsizes
(cons (cons w (* size (- newbot newtop)))
- newsizes))))))
+ newsizes)))))
+ 'nomini)
(walk-windows (function (lambda (w)
(select-window w)
(let ((newsize (cdr (assq w newsizes))))
(enlarge-window (- newsize
(window-height))))))
'nomini)))
-
+\f
;;; 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.
(let ((old-w (selected-window))
(old-point (point))
(size (and arg (prefix-numeric-value arg)))
- new-w bottom switch)
+ (window-full-p nil)
+ new-w bottom switch moved)
(and size (< size 0) (setq size (+ (window-height) size)))
(setq new-w (split-window nil size))
(or split-window-keep-point
(save-excursion
(set-buffer (window-buffer))
(goto-char (window-start))
- (vertical-motion (window-height))
+ (setq moved (vertical-motion (window-height)))
(set-window-start new-w (point))
(if (> (point) (window-point new-w))
(set-window-point new-w (point)))
- (vertical-motion -1)
- (setq bottom (point)))
- (if (<= bottom (point))
- (set-window-point old-w (1- bottom)))
- (if (< (window-start new-w) old-point)
- (progn
- (set-window-point new-w old-point)
- (select-window new-w)))))
+ (and (= moved (window-height))
+ (progn
+ (setq window-full-p t)
+ (vertical-motion -1)))
+ (setq bottom (point)))
+ (and window-full-p
+ (<= bottom (point))
+ (set-window-point old-w (1- bottom)))
+ (and window-full-p
+ (<= (window-start new-w) old-point)
+ (progn
+ (set-window-point new-w old-point)
+ (select-window new-w)))))
new-w))
(defun split-window-horizontally (&optional arg)
(and size (< size 0)
(setq size (+ (window-width) size)))
(split-window nil size t)))
-
+\f
(defun enlarge-window-horizontally (arg)
"Make current window ARG columns wider."
(interactive "p")
(defun shrink-window-if-larger-than-buffer (&optional window)
"Shrink the WINDOW to be as small as possible to display its contents.
-Do not shrink to less that `window-min-height' lines.
+Do not shrink to less than `window-min-height' lines.
Do nothing if the buffer contains more lines than the present window height,
or if some of the window's contents are scrolled out of view,
or if the window is not the full width of the frame,
or if the window is the only window of its frame."
(interactive)
+ (or window (setq window (selected-window)))
(save-excursion
(set-buffer (window-buffer window))
- (let ((w (selected-window)) ;save-window-excursion can't win
- (buffer-file-name buffer-file-name)
- (p (point))
- (n 0)
- (ignore-final-newline
- ;; If buffer ends with a newline, ignore it when counting height
- ;; unless point is after it.
- (and (not (eobp))
- (eq ?\n (char-after (1- (point-max))))))
- (buffer-read-only nil)
- (modified (buffer-modified-p))
- (buffer (current-buffer))
- (mini (cdr (assq 'minibuffer (frame-parameters))))
- (edges (window-edges (selected-window))))
- (if (and (< 1 (count-windows))
- (= (window-width) (screen-width))
+ (let* ((w (selected-window)) ;save-window-excursion can't win
+ (buffer-file-name buffer-file-name)
+ (p (point))
+ (n 0)
+ (ignore-final-newline
+ ;; If buffer ends with a newline, ignore it when counting height
+ ;; unless point is after it.
+ (and (not (eobp))
+ (eq ?\n (char-after (1- (point-max))))))
+ (buffer-read-only nil)
+ (modified (buffer-modified-p))
+ (buffer (current-buffer))
+ (params (frame-parameters (window-frame window)))
+ (mini (cdr (assq 'minibuffer params)))
+ (edges (window-edges (selected-window))))
+ (if (and (< 1 (let ((frame (selected-frame)))
+ (select-frame (window-frame window))
+ (unwind-protect
+ (count-windows)
+ (select-frame frame))))
+ (= (window-width window) (frame-width (window-frame window)))
(pos-visible-in-window-p (point-min) window)
+ (not (eq mini 'only))
(or (not mini)
(< (nth 3 edges)
(nth 1 (window-edges mini)))
(> (nth 1 edges)
- (cdr (assq 'menu-bar-lines (frame-parameters))))))
+ (cdr (assq 'menu-bar-lines params)))))
(unwind-protect
(progn
(select-window (or window w))
HCoop / bpt / emacs.git / blobdiff