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- ;;; 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: extensions
-
- ;; 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 ((n 0)
- (test-pos
- (- (point-max)
- ;; If buffer ends with a newline, ignore it when counting
- ;; height unless point is after it.
- (if (and (not (eobp))
- (eq ?\n (char-after (1- (point-max)))))
- 1 0)))
- (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)
- 0)))
- (progn
- (save-window-excursion
- (goto-char (point-min))
- (while (and (window-live-p window)
- (pos-visible-in-window-p test-pos window))
- (shrink-window 1 nil window)
- (setq n (1+ n))))
- (if (> n 0)
- (shrink-window (min (1- n)
- (- (window-height window)
- (1+ window-min-height)))
- nil
- window)))))))
-
- (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
-