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- ;;; window.el --- XEmacs window commands aside from those written in C.
- ;; Keywords: extensions
-
- ;; Copyright (C) 1985, 1989, 1993, 1994 Free Software Foundation, Inc.
-
- ;; 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, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- ;;; Synched up with: FSF 19.28.
-
- ;;;; 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).
- ALL-FRAMES = 0 means count windows on all visible and iconified frames.
- If ALL-FRAMES is any other value, 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. If MINIBUF is neither t nor nil it means
- not to count the minibuffer even if it is active.
-
- Optional third arg ALL-FRAMES t means include all windows in all frames;
- otherwise cycle within the selected 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))
- ;; 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-history nil)
- (walk-windows-current (selected-window)))
- (while (progn
- (setq walk-windows-current
- (next-window walk-windows-current minibuf all-frames))
- q (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 count-windows (&optional minibuf)
- "Returns the number of visible windows.
- Optional arg NO-MINI non-nil means don't count the minibuffer
- even if it is active."
- (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)
- ;; 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.
- (setq size (/ (frame-pixel-height) 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))))))
- (walk-windows (function (lambda (w)
- (select-window w)
- (let ((newsize (cdr (assq w newsizes))))
- (enlarge-window
- (/ (- newsize (window-pixel-height))
- (face-height 'default))))))
- 'nomini)))
-
- (defvar 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.")
-
- (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 modeline.
-
- 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)))
- new-w bottom)
- (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))
- (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)))))
- 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)
- (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)))
- (if (and (< 1 (count-windows))
- ;; check to make sure that we don't have horizontally
- ;; split windows
- (eq (frame-highest-window (selected-frame) 0)
- (frame-highest-window (selected-frame) -1))
- (pos-visible-in-window-p (point-min) window)
- ;; #### there needs to be a check here for a global
- ;; minibuffer
- )
- (unwind-protect
- (progn
- (select-window (or window w))
- (goto-char (point-min))
- (while (pos-visible-in-window-p
- (- (point-max)
- (if ignore-final-newline 1 0)))
- ;; 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)
- window-min-height)))))
- (delete-region (point-min) (point))
- (set-buffer-modified-p modified)
- (goto-char p)
- (select-window w)
- ;; Make sure we unbind buffer-read-only
- ;; with the proper current buffer.
- (set-buffer buffer))))))
-
- (defun backward-other-window (arg &optional all-frames invisible-too)
- "Select the ARG'th different window on this frame, going backwards.
- This is just like calling `other-window' with the arg negated."
- (interactive "p")
- (other-window (- arg) all-frames invisible-too))
-
- (defun windows-of-buffer (&optional buffer)
- "Returns a list of windows that have BUFFER in them.
- If BUFFER is not specified, the current buffer will be used."
- (or (bufferp buffer)
- (if (stringp buffer)
- (setq buffer (or (get-buffer buffer)
- (get-file-buffer buffer)))
- (setq buffer (current-buffer))))
- (let* ((firstwin (next-window nil nil t))
- (wind firstwin)
- (done nil)
- window-list)
- (while (not done)
- (if (eq (window-buffer wind) buffer)
- (setq window-list (append window-list (list wind))))
- (setq wind (next-window wind nil t))
- (setq done (eq wind firstwin)))
- window-list))
-
- (defun buffer-in-multiple-windows-p (&optional buffer)
- "Returns t if BUFFER is in multiple windows.
- If BUFFER is not specified, the current buffer will be used."
- (setq buffer (or buffer
- (get-buffer buffer)
- (get-file-buffer buffer)
- (current-buffer)))
- (> (length (windows-of-buffer buffer)) 1))
-
- (defun window-list (&optional frame minibuf window)
- "Return a list of windows on FRAME, beginning with WINDOW.
- FRAME and WINDOW default to the selected ones.
- Optional second arg MINIBUF t means count the minibuffer window
- even if not active. If MINIBUF is neither t nor nil it means
- not to count the minibuffer even if it is active."
- (setq window (or window (selected-window))
- frame (or frame (selected-frame)))
- (if (not (eq (window-frame window) frame))
- (error "Window must be on frame."))
- (let ((current-frame (selected-frame))
- list)
- (unwind-protect
- (save-window-excursion
- (select-frame frame)
- (walk-windows
- (function (lambda (cur-window)
- (if (not (eq window cur-window))
- (setq list (cons cur-window list)))))
- minibuf)
- (setq list (cons window list)))
- (select-frame current-frame))))
-
- ;; FSF compatibility function
- (defun set-window-dedicated-p (window arg)
- "Control whether WINDOW is dedicated to the buffer it displays.
- If it is dedicated, Emacs will not automatically change
- which buffer appears in it.
- The second argument is the new value for the dedication flag;
- non-nil means yes."
- (let ((buffer (if arg (window-buffer window) nil)))
- (set-window-buffer-dedicated window buffer)))
-