--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lisp/window.el	Mon Aug 13 10:04:58 2007 +0200
@@ -0,0 +1,374 @@
+;;; window.el --- XEmacs window commands aside from those written in C.
+
+;; Copyright (C) 1985, 1989, 1993-94, 1997 Free Software Foundation, Inc.
+;; Copyright (C) 1995, 1996 Ben Wing.
+
+;; Maintainer: XEmacs Development Team
+;; Keywords: frames, extensions, dumped
+
+;; This file is part of XEmacs.
+
+;; XEmacs is free software; you can redistribute it and/or modify it
+;; under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+
+;; XEmacs is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;; General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with XEmacs; see the file COPYING.  If not, write to the 
+;; Free Software Foundation, 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Synched up with: Emacs/Mule zeta.
+
+;;; Commentary:
+
+;; This file is dumped with XEmacs.
+
+;;; Code:
+
+;;;; Window tree functions.
+
+(defun one-window-p (&optional nomini all-frames device)
+  "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).
+ALL-FRAMES = 0 means count windows on all visible and iconified frames.
+If ALL-FRAMES is any other value, count only the selected frame.
+
+If optional third argument DEVICE is nil or omitted, count frames
+on all devices.
+If a device, count frames only on that device.
+If a device type, count frames only on devices of that type.
+Otherwise, count frames only on the selected device."
+  (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 device))))
+
+(defun walk-windows (proc &optional minibuf all-frames device)
+  "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 optional fourth argument DEVICE is nil or omitted, include frames
+on all devices.
+If a device, include frames only on that device.
+If a device type, include frames only on devices of that type.
+Otherwise, include frames only on the selected device."
+  ;; If we start from the minibuffer window, don't fail to come back to it.
+  (if (window-minibuffer-p (selected-window))
+      (setq minibuf t))
+  ;; Note that, like next-window & previous-window, this behaves a little 
+  ;; strangely if the selected window is on an invisible frame: it hits
+  ;; some of the windows on that frame, and all windows on visible frames.
+  (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
+				device))
+	     (funcall proc walk-windows-current)
+	     (not (eq walk-windows-current walk-windows-start))))))
+;; The old XEmacs definition of the above clause.  It's more correct in
+;; that it will never hit a window that's already been hit even if you
+;; do something odd like `delete-other-windows', but has the problem
+;; that it conses. (This may be called repeatedly, from lazy-lock
+;; for example.)
+;  (let* ((walk-windows-history nil)
+;	 (walk-windows-current (selected-window)))
+;    (while (progn
+;	     (setq walk-windows-current
+;		   (next-window walk-windows-current minibuf all-frames
+;				device))
+;	     (not (memq walk-windows-current walk-windows-history)))
+;      (setq walk-windows-history (cons walk-windows-current
+;				       walk-windows-history))
+;      (funcall proc walk-windows-current))))
+
+(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 'and ; XEmacs
+		    (list 'window-live-p 'save-selected-window-window)
+		    (list 'select-window 'save-selected-window-window)))))
+
+(defun count-windows (&optional minibuf)
+   "Returns the number of visible windows.
+Optional arg MINIBUF non-nil means count the minibuffer
+even if it is inactive."
+   (let ((count 0))
+     (walk-windows (function (lambda (w)
+			       (setq count (+ count 1))))
+		   minibuf)
+     count))
+
+(defun balance-windows ()
+  "Makes all visible windows the same height (approximately)."
+  (interactive)
+  (let ((count -1) levels newsizes size)
+        ;FSFmacs
+	;;; 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
+      (let (tops (prev-top -2))
+	(walk-windows (function (lambda (w)
+                        (setq tops (cons (nth 1 (window-pixel-edges w))
+                                         tops))))
+		      'nomini)
+	(setq tops (sort tops '<))
+	(while tops
+	  (if (> (car tops) (1+ prev-top))
+	      (setq prev-top (car tops)
+		    count (1+ count)))
+	  (setq levels (cons (cons (car tops) count) levels))
+	  (setq tops (cdr tops)))
+	(setq count (1+ count))))
+    ;; Subdivide the frame into that many vertical levels.
+    ;FSFmacs (setq size (/ (- (frame-height) mbl) count))
+    (setq size (/ (window-pixel-height (frame-root-window)) count))
+    (walk-windows (function
+		   (lambda (w)
+                    (select-window w)
+                    (let ((newtop (cdr (assq (nth 1 (window-pixel-edges))
+                                             levels)))
+                          (newbot (or (cdr (assq
+					    (+ (window-pixel-height)
+					       (nth 1 (window-pixel-edges)))
+					    levels))
+                                      count)))
+                      (setq newsizes
+                            (cons (cons w (* size (- newbot newtop)))
+                                  newsizes)))))
+		  'nomini)
+    (walk-windows (function (lambda (w)
+			      (select-window w)
+			      (let ((newsize (cdr (assq w newsizes))))
+				(enlarge-window
+				 (/ (- newsize (window-pixel-height))
+				    (face-height 'default))))))
+                  'nomini)))
+
+;;; I think this should be the default; I think people will prefer it--rms.
+(defcustom split-window-keep-point t
+  "*If non-nil, split windows keeps the original point in both children.
+This is often more convenient for editing.
+If nil, adjust point in each of the two windows to minimize redisplay.
+This is convenient on slow terminals, but point can move strangely."
+  :type 'boolean
+  :group 'windows)
+
+(defun split-window-vertically (&optional arg)
+  "Split current window into two windows, one above the other.
+The uppermost window gets ARG lines and the other gets the rest.
+Negative arg means select the size of the lowermost window instead.
+With no argument, split equally or close to it.
+Both windows display the same buffer now current.
+
+If the variable split-window-keep-point is non-nil, both new windows
+will get the same value of point as the current window.  This is often
+more convenient for editing.
+
+Otherwise, we chose window starts so as to minimize the amount of
+redisplay; this is convenient on slow terminals.  The new selected
+window is the one that the current value of point appears in.  The
+value of point can change if the text around point is hidden by the
+new mode line.
+
+Programs should probably use split-window instead of this."
+  (interactive "P")
+  (let ((old-w (selected-window))
+	(old-point (point))
+	(size (and arg (prefix-numeric-value arg)))
+	(window-full-p nil)
+	new-w bottom moved)
+    (and size (< size 0) (setq size (+ (window-height) size)))
+    (setq new-w (split-window nil size))
+    (or split-window-keep-point
+	(progn
+	  (save-excursion
+	    (set-buffer (window-buffer))
+	    (goto-char (window-start))
+	    (setq moved (vertical-motion (window-height)))
+	    (set-window-start new-w (point))
+	    (if (> (point) (window-point new-w))
+		(set-window-point new-w (point)))
+	    (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)
+  "Split current window into two windows side by side.
+This window becomes the leftmost of the two, and gets ARG columns.
+Negative arg means select the size of the rightmost window instead.
+No arg means split equally."
+  (interactive "P")
+  (let ((size (and arg (prefix-numeric-value arg))))
+    (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")
+  (enlarge-window arg t))
+
+(defun shrink-window-horizontally (arg)
+  "Make current window ARG columns narrower."
+  (interactive "p")
+  (shrink-window arg t))
+
+(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 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 (frame-property (window-frame window) 'minibuffer))
+	   (edges (window-pixel-edges (selected-window))))
+      (if (and (< 1 (let ((frame (selected-frame)))
+		      (select-frame (window-frame window))
+		      (unwind-protect
+			  (count-windows)
+			(select-frame frame))))
+	       ;; check to make sure that we don't have horizontally
+	       ;; split windows
+	       (eq (frame-highest-window (window-frame window) 0)
+		   (frame-highest-window (window-frame window) -1))
+	       (pos-visible-in-window-p (point-min) window)
+	       (not (eq mini 'only))
+	       (or (not mini) (eq mini t)
+		   (< (nth 3 edges)
+		      (nth 1 (window-pixel-edges mini)))
+		   (> (nth 1 edges)
+		      ;FSFmacs (frame-property (window-frame window)
+		      ;			       'menu-bar-lines params)
+		      0)))
+	  (unwind-protect
+	      (let ((shrinkee (or window w)))
+		(set-buffer (window-buffer shrinkee))
+		(goto-char (point-min))
+		(while (pos-visible-in-window-p
+			(- (point-max)
+			   (if ignore-final-newline 1 0))
+			shrinkee)
+		  ;; defeat file locking... don't try this at home, kids!
+		  (setq buffer-file-name nil)
+		  (insert ?\n) (setq n (1+ n)))
+		(if (> n 0)
+		    (shrink-window (min (1- n)
+					(- (window-height shrinkee)
+					   window-min-height))
+				   nil
+				   shrinkee)))
+	    (delete-region (point-min) (point))
+	    (set-buffer-modified-p modified)
+	    (goto-char p)
+	    ;; (select-window w) ; Emacs
+	    ;; Make sure we unbind buffer-read-only
+	    ;; with the proper current buffer.
+	    (set-buffer buffer))))))
+
+(defun kill-buffer-and-window ()
+  "Kill the current buffer and delete the selected window."
+  (interactive)
+  (if (yes-or-no-p (format "Kill buffer `%s'? " (buffer-name)))
+      (let ((buffer (current-buffer)))
+	(delete-window (selected-window))
+	(kill-buffer buffer))
+    (error "Aborted")))
+
+;;; New with XEmacs 20.3
+;;; Suggested by Noah Friedman, and tuned by Hrvoje Niksic.
+(defun window-list (&optional minibuf all-frames device)
+  "Return a list of existing windows.
+If the optional argument MINIBUF is non-nil, then include minibuffer
+windows in the result.
+
+By default, only the windows in the selected frame are returned.
+The optional argument ALL-FRAMES changes this behavior:
+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 the selected frame.
+The optional fourth argument DEVICE further clarifies which frames to
+search as specified by ALL-FRAMES.  This value is only meaningful if
+ALL-FRAMES is non-nil.
+If nil or omitted, search only the selected device.
+If a device, search frames only on that device.
+If a device type, search frames only on devices of that type.
+Any other non-nil value means search frames on all devices."
+  (let ((wins nil))
+    (walk-windows (lambda (win)
+                    (push win wins))
+                  minibuf all-frames device)
+    wins))
+
+
+;;; window.el ends here