-;;; window.el --- GNU Emacs window commands aside from those written in C.
+;;; 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, 2000, 2001, 2002,
+;; 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
;; Maintainer: FSF
+;; Keywords: internal
;; This file is part of GNU Emacs.
;; 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, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;; Window tree functions.
;;; Code:
-;;;; Window tree functions.
+(defvar window-size-fixed nil
+ "*Non-nil in a buffer means windows displaying the buffer are fixed-size.
+If the value is `height', then only the window's height is fixed.
+If the value is `width', then only the window's width is fixed.
+Any other non-nil value fixes both the width and the height.
+Emacs won't change the size of any window displaying that buffer,
+unless you explicitly change the size, or Emacs has no other choice.")
+(make-variable-buffer-local 'window-size-fixed)
+
+(defmacro save-selected-window (&rest body)
+ "Execute BODY, then select the window that was selected before BODY.
+The value returned is the value of the last form in BODY.
+
+This macro saves and restores the current buffer, since otherwise
+its normal operation could potentially make a different
+buffer current. It does not alter the buffer list ordering.
+
+This macro saves and restores the selected window, as well as
+the selected window in each frame. If the previously selected
+window of some frame is no longer live at the end of BODY, that
+frame's selected window is left alone. If the selected window is
+no longer live, then whatever window is selected at the end of
+BODY remains selected."
+ `(let ((save-selected-window-window (selected-window))
+ ;; It is necessary to save all of these, because calling
+ ;; select-window changes frame-selected-window for whatever
+ ;; frame that window is in.
+ (save-selected-window-alist
+ (mapcar (lambda (frame) (list frame (frame-selected-window frame)))
+ (frame-list))))
+ (save-current-buffer
+ (unwind-protect
+ (progn ,@body)
+ (dolist (elt save-selected-window-alist)
+ (and (frame-live-p (car elt))
+ (window-live-p (cadr elt))
+ (set-frame-selected-window (car elt) (cadr elt))))
+ (if (window-live-p save-selected-window-window)
+ (select-window save-selected-window-window))))))
+
+(defun window-body-height (&optional window)
+ "Return number of lines in window WINDOW for actual buffer text.
+This does not include the mode line (if any) or the header line (if any)."
+ (or window (setq window (selected-window)))
+ (if (window-minibuffer-p window)
+ (window-height window)
+ (with-current-buffer (window-buffer window)
+ (max 1 (- (window-height window)
+ (if mode-line-format 1 0)
+ (if header-line-format 1 0))))))
(defun one-window-p (&optional nomini all-frames)
- "Returns non-nil if the selected window is the only window (in its frame).
+ "Return non-nil if the selected window is the only window.
Optional arg NOMINI non-nil means don't count the minibuffer
-even if it is active.
+even if it is active. Otherwise, the minibuffer is counted
+when 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,
+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."
+ALL-FRAMES 0 means count all windows in all visible or iconified frames.
+If ALL-FRAMES is anything else, 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 window-current-scroll-bars (&optional window)
+ "Return the current scroll-bar settings in window WINDOW.
+Value is a cons (VERTICAL . HORIZONTAL) where VERTICAL specifies the
+current location of the vertical scroll-bars (left, right, or nil),
+and HORIZONTAL specifies the current location of the horizontal scroll
+bars (top, bottom, or nil)."
+ (let ((vert (nth 2 (window-scroll-bars window)))
+ (hor nil))
+ (when (or (eq vert t) (eq hor t))
+ (let ((fcsb (frame-current-scroll-bars
+ (window-frame (or window (selected-window))))))
+ (if (eq vert t)
+ (setq vert (car fcsb)))
+ (if (eq hor t)
+ (setq hor (cdr fcsb)))))
+ (cons vert hor)))
+
(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.
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.
+If ALL-FRAMES is a frame, it means include windows on that frame.
Anything else means restrict to 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))
- (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))))))
+ (save-selected-window
+ (if (framep all-frames)
+ (select-window (frame-first-window all-frames)))
+ (let* (walk-windows-already-seen
+ (walk-windows-current (selected-window)))
+ (while (progn
+ (setq walk-windows-current
+ (next-window walk-windows-current minibuf all-frames))
+ (not (memq walk-windows-current walk-windows-already-seen)))
+ (setq walk-windows-already-seen
+ (cons walk-windows-current walk-windows-already-seen))
+ (funcall proc walk-windows-current)))))
+
+(defun get-window-with-predicate (predicate &optional minibuf
+ all-frames default)
+ "Return a window satisfying PREDICATE.
+
+This function cycles through all visible windows using `walk-windows',
+calling PREDICATE on each one. PREDICATE is called with a window as
+argument. The first window for which PREDICATE returns a non-nil
+value is returned. If no window satisfies PREDICATE, DEFAULT is
+returned.
+
+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, if you are using a separate minibuffer frame
+and the minibuffer is active and MINIBUF says it counts,
+`walk-windows' includes the windows in the frame from which you
+entered the minibuffer, as well as the minibuffer window.
+
+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.
+If ALL-FRAMES is a frame, it means include windows on that frame.
+Anything else means restrict to the selected frame."
+ (catch 'found
+ (walk-windows #'(lambda (window)
+ (when (funcall predicate window)
+ (throw 'found window)))
+ minibuf all-frames)
+ default))
+
+(defalias 'some-window 'get-window-with-predicate)
+
+;; This should probably be written in C (i.e., without using `walk-windows').
+(defun get-buffer-window-list (buffer &optional minibuf frame)
+ "Return list of all windows displaying BUFFER, or nil if none.
+BUFFER can be a buffer or a buffer name.
+See `walk-windows' for the meaning of MINIBUF and FRAME."
+ (let ((buffer (if (bufferp buffer) buffer (get-buffer buffer))) windows)
+ (walk-windows (function (lambda (window)
+ (if (eq (window-buffer window) buffer)
+ (setq windows (cons window windows)))))
+ minibuf frame)
+ windows))
(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.
+ "Return the number of visible windows.
This counts the windows in the selected frame and (if the minibuffer is
to be counted) its minibuffer frame (if that's not the same frame).
The optional arg MINIBUF non-nil means count the minibuffer
minibuf)
count))
-(defun balance-windows ()
- "Makes all visible windows the same height (approximately)."
+(defun window-safely-shrinkable-p (&optional window)
+ "Non-nil if the WINDOW can be shrunk without shrinking other windows.
+If WINDOW is nil or omitted, it defaults to the currently selected window."
+ (with-selected-window (or window (selected-window))
+ (let ((edges (window-edges)))
+ (or (= (nth 2 edges) (nth 2 (window-edges (previous-window))))
+ (= (nth 0 edges) (nth 0 (window-edges (next-window))))))))
+
+\f
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;; `balance-windows' subroutines using `window-tree'
+
+;;; Translate from internal window tree format
+
+(defun bw-get-tree (&optional window-or-frame)
+ "Get a window split tree in our format.
+
+WINDOW-OR-FRAME must be nil, a frame, or a window. If it is nil,
+then the whole window split tree for `selected-frame' is returned.
+If it is a frame, then this is used instead. If it is a window,
+then the smallest tree containing that window is returned."
+ (when window-or-frame
+ (unless (or (framep window-or-frame)
+ (windowp window-or-frame))
+ (error "Not a frame or window: %s" window-or-frame)))
+ (let ((subtree (bw-find-tree-sub window-or-frame)))
+ (if (integerp subtree)
+ nil
+ (bw-get-tree-1 subtree))))
+
+(defun bw-get-tree-1 (split)
+ (if (windowp split)
+ split
+ (let ((dir (car split))
+ (edges (car (cdr split)))
+ (childs (cdr (cdr split))))
+ (list
+ (cons 'dir (if dir 'ver 'hor))
+ (cons 'b (nth 3 edges))
+ (cons 'r (nth 2 edges))
+ (cons 't (nth 1 edges))
+ (cons 'l (nth 0 edges))
+ (cons 'childs (mapcar #'bw-get-tree-1 childs))))))
+
+(defun bw-find-tree-sub (window-or-frame &optional get-parent)
+ (let* ((window (when (windowp window-or-frame) window-or-frame))
+ (frame (when (windowp window) (window-frame window)))
+ (wt (car (window-tree frame))))
+ (when (< 1 (length (window-list frame 0)))
+ (if window
+ (bw-find-tree-sub-1 wt window get-parent)
+ wt))))
+
+(defun bw-find-tree-sub-1 (tree win &optional get-parent)
+ (unless (windowp win) (error "Not a window: %s" win))
+ (if (memq win tree)
+ (if get-parent
+ get-parent
+ tree)
+ (let ((childs (cdr (cdr tree)))
+ child
+ subtree)
+ (while (and childs (not subtree))
+ (setq child (car childs))
+ (setq childs (cdr childs))
+ (when (and child (listp child))
+ (setq subtree (bw-find-tree-sub-1 child win get-parent))))
+ (if (integerp subtree)
+ (progn
+ (if (= 1 subtree)
+ tree
+ (1- subtree)))
+ subtree
+ ))))
+
+;;; Window or object edges
+
+(defun bw-l (obj)
+ "Left edge of OBJ."
+ (if (windowp obj) (nth 0 (window-edges obj)) (cdr (assq 'l obj))))
+(defun bw-t (obj)
+ "Top edge of OBJ."
+ (if (windowp obj) (nth 1 (window-edges obj)) (cdr (assq 't obj))))
+(defun bw-r (obj)
+ "Right edge of OBJ."
+ (if (windowp obj) (nth 2 (window-edges obj)) (cdr (assq 'r obj))))
+(defun bw-b (obj)
+ "Bottom edge of OBJ."
+ (if (windowp obj) (nth 3 (window-edges obj)) (cdr (assq 'b obj))))
+
+;;; Split directions
+
+(defun bw-dir (obj)
+ "Return window split tree direction if OBJ.
+If OBJ is a window return 'both. If it is a window split tree
+then return its direction."
+ (if (symbolp obj)
+ obj
+ (if (windowp obj)
+ 'both
+ (let ((dir (cdr (assq 'dir obj))))
+ (unless (memq dir '(hor ver both))
+ (error "Can't find dir in %s" obj))
+ dir))))
+
+(defun bw-eqdir (obj1 obj2)
+ "Return t if window split tree directions are equal.
+OBJ1 and OBJ2 should be either windows or window split trees in
+our format. The directions returned by `bw-dir' are compared and
+t is returned if they are `eq' or one of them is 'both."
+ (let ((dir1 (bw-dir obj1))
+ (dir2 (bw-dir obj2)))
+ (or (eq dir1 dir2)
+ (eq dir1 'both)
+ (eq dir2 'both))))
+
+;;; Building split tree
+
+(defun bw-refresh-edges (obj)
+ "Refresh the edge information of OBJ and return OBJ."
+ (unless (windowp obj)
+ (let ((childs (cdr (assq 'childs obj)))
+ (ol 1000)
+ (ot 1000)
+ (or -1)
+ (ob -1))
+ (dolist (o childs)
+ (when (> ol (bw-l o)) (setq ol (bw-l o)))
+ (when (> ot (bw-t o)) (setq ot (bw-t o)))
+ (when (< or (bw-r o)) (setq or (bw-r o)))
+ (when (< ob (bw-b o)) (setq ob (bw-b o))))
+ (setq obj (delq 'l obj))
+ (setq obj (delq 't obj))
+ (setq obj (delq 'r obj))
+ (setq obj (delq 'b obj))
+ (add-to-list 'obj (cons 'l ol))
+ (add-to-list 'obj (cons 't ot))
+ (add-to-list 'obj (cons 'r or))
+ (add-to-list 'obj (cons 'b ob))
+ ))
+ obj)
+
+;;; Balance windows
+
+(defun balance-windows (&optional window-or-frame)
+ "Make windows the same heights or widths in window split subtrees.
+
+When called non-interactively WINDOW-OR-FRAME may be either a
+window or a frame. It then balances the windows on the implied
+frame. If the parameter is a window only the corresponding window
+subtree is balanced."
(interactive)
- (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
- (let (tops (prev-top -2))
- (walk-windows (function (lambda (w)
- (setq tops (cons (nth 1 (window-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-height) mbl) count))
- (walk-windows (function
- (lambda (w)
- (select-window w)
- (let ((newtop (cdr (assq (nth 1 (window-edges))
- levels)))
- (newbot (or (cdr (assq (+ (window-height)
- (nth 1 (window-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-height))))))
- 'nomini)))
+ (let (
+ (wt (bw-get-tree window-or-frame))
+ (w)
+ (h)
+ (tried-sizes)
+ (last-sizes)
+ (windows (window-list nil 0))
+ (counter 0))
+ (when wt
+ (while (not (member last-sizes tried-sizes))
+ (when last-sizes (setq tried-sizes (cons last-sizes tried-sizes)))
+ (setq last-sizes (mapcar (lambda (w)
+ (window-edges w))
+ windows))
+ (when (eq 'hor (bw-dir wt))
+ (setq w (- (bw-r wt) (bw-l wt))))
+ (when (eq 'ver (bw-dir wt))
+ (setq h (- (bw-b wt) (bw-t wt))))
+ (bw-balance-sub wt w h)))))
+
+(defun bw-adjust-window (window delta horizontal)
+ "Wrapper around `adjust-window-trailing-edge' with error checking.
+Arguments WINDOW, DELTA and HORIZONTAL are passed on to that function."
+ (condition-case err
+ (adjust-window-trailing-edge window delta horizontal)
+ (error
+ ;;(message "adjust: %s" (error-message-string err))
+ )))
+
+(defun bw-balance-sub (wt w h)
+ (setq wt (bw-refresh-edges wt))
+ (unless w (setq w (- (bw-r wt) (bw-l wt))))
+ (unless h (setq h (- (bw-b wt) (bw-t wt))))
+ (if (windowp wt)
+ (progn
+ (when w
+ (let ((dw (- w (- (bw-r wt) (bw-l wt)))))
+ (when (/= 0 dw)
+ (bw-adjust-window wt dw t))))
+ (when h
+ (let ((dh (- h (- (bw-b wt) (bw-t wt)))))
+ (when (/= 0 dh)
+ (bw-adjust-window wt dh nil)))))
+ (let* ((childs (cdr (assq 'childs wt)))
+ (lastchild (car (last childs)))
+ (cw (when w (/ w (if (bw-eqdir 'hor wt) (length childs) 1))))
+ (ch (when h (/ h (if (bw-eqdir 'ver wt) (length childs) 1)))))
+ (dolist (c childs)
+ (bw-balance-sub c cw ch)))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
\f
-;;; I think this should be the default; I think people will prefer it--rms.
+;; 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.
+ "*If non-nil, \\[split-window-vertically] 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."
+This is convenient on slow terminals, but point can move strangely.
+
+This option applies only to `split-window-vertically' and
+functions that call it. `split-window' always keeps the original
+point in both children."
: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.
+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.
+more convenient for editing. The upper window is the selected window.
-Otherwise, we chose window starts so as to minimize the amount of
+Otherwise, we choose 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."
+new mode line.
+
+Regardless of the value of `split-window-keep-point', the upper
+window is the original one and the return value is the new, lower
+window."
(interactive "P")
(let ((old-w (selected-window))
(old-point (point))
(defvar view-return-to-alist)
(defun split-window-save-restore-data (new-w old-w)
- (save-excursion
- (set-buffer (window-buffer))
+ (with-current-buffer (window-buffer)
(if view-mode
(let ((old-info (assq old-w view-return-to-alist)))
- (setq view-return-to-alist
- (cons (cons new-w (cons (and old-info (car (cdr old-info))) t))
- view-return-to-alist))))
+ (if old-info
+ (push (cons new-w (cons (car (cdr old-info)) t))
+ view-return-to-alist))))
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.
+Negative ARG means select the size of the rightmost window instead.
The argument includes the width of the window's scroll bar; if there
are no scroll bars, it includes the width of the divider column
-to the window's right, if any. No arg means split equally."
+to the window's right, if any. No ARG means split equally.
+
+The original, leftmost window remains selected.
+The return value is the new, rightmost window."
(interactive "P")
(let ((old-w (selected-window))
(size (and arg (prefix-numeric-value arg))))
(and size (< size 0)
(setq size (+ (window-width) size)))
(split-window-save-restore-data (split-window nil size t) old-w)))
+
+\f
+(defun set-window-text-height (window height)
+ "Sets the height in lines of the text display area of WINDOW to HEIGHT.
+This doesn't include the mode-line (or header-line if any) or any
+partial-height lines in the text display area.
+
+If WINDOW is nil, the selected window is used.
+
+Note that the current implementation of this function cannot always set
+the height exactly, but attempts to be conservative, by allocating more
+lines than are actually needed in the case where some error may be present."
+ (let ((delta (- height (window-text-height window))))
+ (unless (zerop delta)
+ (let ((window-min-height 1))
+ (if (and window (not (eq window (selected-window))))
+ (save-selected-window
+ (select-window window)
+ (enlarge-window delta))
+ (enlarge-window delta))))))
+
\f
(defun enlarge-window-horizontally (arg)
"Make current window ARG columns wider."
(defun window-buffer-height (window)
"Return the height (in screen lines) of the buffer that WINDOW is displaying."
- (save-excursion
- (set-buffer (window-buffer window))
- (goto-char (point-min))
- (let ((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)))))))
- (+ 1 (nth 2 (compute-motion (point-min)
- '(0 . 0)
- (- (point-max) (if ignore-final-newline 1 0))
- (cons 0 100000000)
- (window-width window)
- nil
- window))))))
+ (with-current-buffer (window-buffer window)
+ (max 1
+ (count-screen-lines (point-min) (point-max)
+ ;; If buffer ends with a newline, ignore it when
+ ;; counting height unless point is after it.
+ (eobp)
+ window))))
+
+(defun count-screen-lines (&optional beg end count-final-newline window)
+ "Return the number of screen lines in the region.
+The number of screen lines may be different from the number of actual lines,
+due to line breaking, display table, etc.
+
+Optional arguments BEG and END default to `point-min' and `point-max'
+respectively.
+
+If region ends with a newline, ignore it unless optional third argument
+COUNT-FINAL-NEWLINE is non-nil.
+
+The optional fourth argument WINDOW specifies the window used for obtaining
+parameters such as width, horizontal scrolling, and so on. The default is
+to use the selected window's parameters.
+
+Like `vertical-motion', `count-screen-lines' always uses the current buffer,
+regardless of which buffer is displayed in WINDOW. This makes possible to use
+`count-screen-lines' in any buffer, whether or not it is currently displayed
+in some window."
+ (unless beg
+ (setq beg (point-min)))
+ (unless end
+ (setq end (point-max)))
+ (if (= beg end)
+ 0
+ (save-excursion
+ (save-restriction
+ (widen)
+ (narrow-to-region (min beg end)
+ (if (and (not count-final-newline)
+ (= ?\n (char-before (max beg end))))
+ (1- (max beg end))
+ (max beg end)))
+ (goto-char (point-min))
+ (1+ (vertical-motion (buffer-size) window))))))
+
+(defun fit-window-to-buffer (&optional window max-height min-height)
+ "Make WINDOW the right size to display its contents exactly.
+If WINDOW is omitted or nil, it defaults to the selected window.
+If the optional argument MAX-HEIGHT is supplied, it is the maximum height
+ the window is allowed to be, defaulting to the frame height.
+If the optional argument MIN-HEIGHT is supplied, it is the minimum
+ height the window is allowed to be, defaulting to `window-min-height'.
+
+The heights in MAX-HEIGHT and MIN-HEIGHT include the mode-line and/or
+header-line."
+ (interactive)
+
+ (when (null window)
+ (setq window (selected-window)))
+ (when (null max-height)
+ (setq max-height (frame-height (window-frame window))))
+
+ (let* ((buf
+ ;; Buffer that is displayed in WINDOW
+ (window-buffer window))
+ (window-height
+ ;; The current height of WINDOW
+ (window-height window))
+ (desired-height
+ ;; The height necessary to show the buffer displayed by WINDOW
+ ;; (`count-screen-lines' always works on the current buffer).
+ (with-current-buffer buf
+ (+ (count-screen-lines)
+ ;; If the buffer is empty, (count-screen-lines) is
+ ;; zero. But, even in that case, we need one text line
+ ;; for cursor.
+ (if (= (point-min) (point-max))
+ 1 0)
+ ;; For non-minibuffers, count the mode-line, if any
+ (if (and (not (window-minibuffer-p window))
+ mode-line-format)
+ 1 0)
+ ;; Count the header-line, if any
+ (if header-line-format 1 0))))
+ (delta
+ ;; Calculate how much the window height has to change to show
+ ;; desired-height lines, constrained by MIN-HEIGHT and MAX-HEIGHT.
+ (- (max (min desired-height max-height)
+ (or min-height window-min-height))
+ window-height))
+ ;; We do our own height checking, so avoid any restrictions due to
+ ;; window-min-height.
+ (window-min-height 1))
+
+ ;; Don't try to redisplay with the cursor at the end
+ ;; on its own line--that would force a scroll and spoil things.
+ (when (with-current-buffer buf
+ (and (eobp) (bolp) (not (bobp))))
+ (set-window-point window (1- (window-point window))))
+
+ (save-selected-window
+ (select-window window)
+
+ ;; Adjust WINDOW to the nominally correct size (which may actually
+ ;; be slightly off because of variable height text, etc).
+ (unless (zerop delta)
+ (enlarge-window delta))
+
+ ;; Check if the last line is surely fully visible. If not,
+ ;; enlarge the window.
+ (let ((end (with-current-buffer buf
+ (save-excursion
+ (goto-char (point-max))
+ (when (and (bolp) (not (bobp)))
+ ;; Don't include final newline
+ (backward-char 1))
+ (when truncate-lines
+ ;; If line-wrapping is turned off, test the
+ ;; beginning of the last line for visibility
+ ;; instead of the end, as the end of the line
+ ;; could be invisible by virtue of extending past
+ ;; the edge of the window.
+ (forward-line 0))
+ (point)))))
+ (set-window-vscroll window 0)
+ (while (and (< desired-height max-height)
+ (= desired-height (window-height window))
+ (not (pos-visible-in-window-p end window)))
+ (enlarge-window 1)
+ (setq desired-height (1+ desired-height)))))))
(defun shrink-window-if-larger-than-buffer (&optional window)
"Shrink the WINDOW to be as small as possible to display its contents.
+If WINDOW is omitted or nil, it defaults to the selected window.
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 shrinking this window would also shrink another window,
or if the window is the only window of its frame."
(interactive)
- (save-selected-window
- (if window
- (select-window window)
- (setq window (selected-window)))
- (let* ((params (frame-parameters))
- (mini (cdr (assq 'minibuffer params)))
- (edges (window-edges)))
- (if (and (< 1 (count-windows))
- (= (window-width) (frame-width))
- (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 params)))))
- (let ((text-height (window-buffer-height window))
- (window-height (window-height)))
- (when (> window-height (1+ text-height))
- (shrink-window
- (- window-height (max (1+ text-height) window-min-height)))))))))
+ (when (null window)
+ (setq window (selected-window)))
+ (let* ((frame (window-frame window))
+ (mini (frame-parameter frame 'minibuffer))
+ (edges (window-edges window)))
+ (if (and (not (eq window (frame-root-window frame)))
+ (window-safely-shrinkable-p)
+ (pos-visible-in-window-p (point-min) window)
+ (not (eq mini 'only))
+ (or (not mini)
+ (let ((mini-window (minibuffer-window frame)))
+ (or (null mini-window)
+ (not (eq frame (window-frame mini-window)))
+ (< (nth 3 edges)
+ (nth 1 (window-edges mini-window)))
+ (> (nth 1 edges)
+ (frame-parameter frame 'menu-bar-lines))))))
+ (fit-window-to-buffer window (window-height 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")))
+ (let ((window-to-delete (selected-window))
+ (delete-window-hook (lambda ()
+ (condition-case nil
+ (delete-window)
+ (error nil)))))
+ (add-hook 'kill-buffer-hook delete-window-hook t t)
+ (if (kill-buffer (current-buffer))
+ ;; If `delete-window' failed before, we rerun it to regenerate
+ ;; the error so it can be seen in the minibuffer.
+ (when (eq (selected-window) window-to-delete)
+ (delete-window))
+ (remove-hook 'kill-buffer-hook delete-window-hook t))))
(defun quit-window (&optional kill window)
"Quit the current buffer. Bury it, and maybe delete the selected frame.
-\(The frame is deleted if it is contains a dedicated window for the buffer.)
+\(The frame is deleted if it contains a dedicated window for the buffer.)
With a prefix argument, kill the buffer instead.
Noninteractively, if KILL is non-nil, then kill the current buffer,
(and window (not window-handled) (not window-solitary)
(delete-window window))))
+(defun handle-select-window (event)
+ "Handle select-window events."
+ (interactive "e")
+ (let ((window (posn-window (event-start event))))
+ (if (and (window-live-p window)
+ ;; Don't switch if we're currently in the minibuffer.
+ ;; This tries to work around problems where the minibuffer gets
+ ;; unselected unexpectedly, and where you then have to move
+ ;; your mouse all the way down to the minibuffer to select it.
+ (not (window-minibuffer-p (selected-window)))
+ ;; Don't switch to a minibuffer window unless it's active.
+ (or (not (window-minibuffer-p window))
+ (minibuffer-window-active-p window)))
+ (select-window window))))
+
(define-key ctl-x-map "2" 'split-window-vertically)
(define-key ctl-x-map "3" 'split-window-horizontally)
(define-key ctl-x-map "}" 'enlarge-window-horizontally)
(define-key ctl-x-map "+" 'balance-windows)
(define-key ctl-x-4-map "0" 'kill-buffer-and-window)
-;;; windows.el ends here
+;; arch-tag: b508dfcc-c353-4c37-89fa-e773fe10cea9
+;;; window.el ends here