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209
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1 ;;; window.el --- XEmacs window commands aside from those written in C.
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2
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3 ;; Copyright (C) 1985, 1989, 1993-94, 1997 Free Software Foundation, Inc.
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4 ;; Copyright (C) 1995, 1996 Ben Wing.
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5
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6 ;; Maintainer: XEmacs Development Team
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7 ;; Keywords: frames, extensions, dumped
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8
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9 ;; This file is part of XEmacs.
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs; see the file COPYING. If not, write to the
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23 ;; Free Software Foundation, 59 Temple Place - Suite 330,
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24 ;; Boston, MA 02111-1307, USA.
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25
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26 ;;; Synched up with: Emacs/Mule zeta.
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27
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28 ;;; Commentary:
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29
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30 ;; This file is dumped with XEmacs.
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31
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32 ;;; Code:
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33
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34 ;;;; Window tree functions.
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35
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36 (defun one-window-p (&optional nomini all-frames device)
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37 "Returns non-nil if the selected window is the only window (in its frame).
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38 Optional arg NOMINI non-nil means don't count the minibuffer
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39 even if it is active.
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40
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41 The optional arg ALL-FRAMES t means count windows on all frames.
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42 If it is `visible', count windows on all visible frames.
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43 ALL-FRAMES nil or omitted means count only the selected frame,
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44 plus the minibuffer it uses (which may be on another frame).
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45 ALL-FRAMES = 0 means count windows on all visible and iconified frames.
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46 If ALL-FRAMES is any other value, count only the selected frame.
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47
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48 If optional third argument DEVICE is nil or omitted, count frames
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49 on all devices.
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50 If a device, count frames only on that device.
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51 If a device type, count frames only on devices of that type.
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52 Otherwise, count frames only on the selected device."
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53 (let ((base-window (selected-window)))
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54 (if (and nomini (eq base-window (minibuffer-window)))
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55 (setq base-window (next-window base-window)))
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56 (eq base-window
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57 (next-window base-window (if nomini 'arg) all-frames device))))
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58
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59 (defun walk-windows (proc &optional minibuf all-frames device)
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60 "Cycle through all visible windows, calling PROC for each one.
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61 PROC is called with a window as argument.
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62
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63 Optional second arg MINIBUF t means count the minibuffer window even
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64 if not active. MINIBUF nil or omitted means count the minibuffer iff
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65 it is active. MINIBUF neither t nor nil means not to count the
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66 minibuffer even if it is active.
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67
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68 Several frames may share a single minibuffer; if the minibuffer
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69 counts, all windows on all frames that share that minibuffer count
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70 too. Therefore, when a separate minibuffer frame is active,
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71 `walk-windows' includes the windows in the frame from which you
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72 entered the minibuffer, as well as the minibuffer window. But if the
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73 minibuffer does not count, only windows from WINDOW's frame count.
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74
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75 ALL-FRAMES is the optional third argument.
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76 ALL-FRAMES nil or omitted means cycle within the frames as specified above.
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77 ALL-FRAMES = `visible' means include windows on all visible frames.
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78 ALL-FRAMES = 0 means include windows on all visible and iconified frames.
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79 ALL-FRAMES = t means include windows on all frames including invisible frames.
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80 Anything else means restrict to WINDOW's frame.
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81
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82 If optional fourth argument DEVICE is nil or omitted, include frames
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83 on all devices.
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84 If a device, include frames only on that device.
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85 If a device type, include frames only on devices of that type.
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86 Otherwise, include frames only on the selected device."
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87 ;; If we start from the minibuffer window, don't fail to come back to it.
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88 (if (window-minibuffer-p (selected-window))
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89 (setq minibuf t))
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90 ;; Note that, like next-window & previous-window, this behaves a little
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91 ;; strangely if the selected window is on an invisible frame: it hits
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92 ;; some of the windows on that frame, and all windows on visible frames.
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93 (let* ((walk-windows-start (selected-window))
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94 (walk-windows-current walk-windows-start))
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95 (while (progn
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96 (setq walk-windows-current
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97 (next-window walk-windows-current minibuf all-frames
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98 device))
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99 (funcall proc walk-windows-current)
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100 (not (eq walk-windows-current walk-windows-start))))))
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101 ;; The old XEmacs definition of the above clause. It's more correct in
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102 ;; that it will never hit a window that's already been hit even if you
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103 ;; do something odd like `delete-other-windows', but has the problem
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104 ;; that it conses. (This may be called repeatedly, from lazy-lock
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105 ;; for example.)
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106 ; (let* ((walk-windows-history nil)
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107 ; (walk-windows-current (selected-window)))
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108 ; (while (progn
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109 ; (setq walk-windows-current
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110 ; (next-window walk-windows-current minibuf all-frames
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111 ; device))
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112 ; (not (memq walk-windows-current walk-windows-history)))
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113 ; (setq walk-windows-history (cons walk-windows-current
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114 ; walk-windows-history))
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115 ; (funcall proc walk-windows-current))))
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116
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117 (defun minibuffer-window-active-p (window)
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118 "Return t if WINDOW (a minibuffer window) is now active."
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119 (eq window (active-minibuffer-window)))
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120
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121 (defmacro save-selected-window (&rest body)
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122 "Execute BODY, then select the window that was selected before BODY."
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123 (list 'let
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124 '((save-selected-window-window (selected-window)))
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125 (list 'unwind-protect
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126 (cons 'progn body)
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127 (list 'and ; XEmacs
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128 (list 'window-live-p 'save-selected-window-window)
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129 (list 'select-window 'save-selected-window-window)))))
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130
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131 (defun count-windows (&optional minibuf)
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132 "Returns the number of visible windows.
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133 Optional arg MINIBUF non-nil means count the minibuffer
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134 even if it is inactive."
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135 (let ((count 0))
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136 (walk-windows (function (lambda (w)
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137 (setq count (+ count 1))))
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138 minibuf)
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139 count))
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140
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141 (defun balance-windows ()
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142 "Makes all visible windows the same height (approximately)."
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143 (interactive)
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144 (let ((count -1) levels newsizes size)
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145 ;FSFmacs
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146 ;;; Don't count the lines that are above the uppermost windows.
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147 ;;; (These are the menu bar lines, if any.)
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148 ;(mbl (nth 1 (window-edges (frame-first-window (selected-frame))))))
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149 ;; Find all the different vpos's at which windows start,
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150 ;; then count them. But ignore levels that differ by only 1.
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151 (save-window-excursion
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152 (let (tops (prev-top -2))
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153 (walk-windows (function (lambda (w)
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154 (setq tops (cons (nth 1 (window-pixel-edges w))
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155 tops))))
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156 'nomini)
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157 (setq tops (sort tops '<))
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158 (while tops
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159 (if (> (car tops) (1+ prev-top))
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160 (setq prev-top (car tops)
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161 count (1+ count)))
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162 (setq levels (cons (cons (car tops) count) levels))
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163 (setq tops (cdr tops)))
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164 (setq count (1+ count))))
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165 ;; Subdivide the frame into that many vertical levels.
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166 ;FSFmacs (setq size (/ (- (frame-height) mbl) count))
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167 (setq size (/ (window-pixel-height (frame-root-window)) count))
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168 (walk-windows (function
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169 (lambda (w)
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170 (select-window w)
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171 (let ((newtop (cdr (assq (nth 1 (window-pixel-edges))
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172 levels)))
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173 (newbot (or (cdr (assq
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174 (+ (window-pixel-height)
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175 (nth 1 (window-pixel-edges)))
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176 levels))
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177 count)))
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178 (setq newsizes
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179 (cons (cons w (* size (- newbot newtop)))
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180 newsizes)))))
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181 'nomini)
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182 (walk-windows (function (lambda (w)
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183 (select-window w)
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184 (let ((newsize (cdr (assq w newsizes))))
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185 (enlarge-window
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186 (/ (- newsize (window-pixel-height))
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187 (face-height 'default))))))
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188 'nomini)))
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189
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190 ;;; I think this should be the default; I think people will prefer it--rms.
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191 (defcustom split-window-keep-point t
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192 "*If non-nil, split windows keeps the original point in both children.
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193 This is often more convenient for editing.
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194 If nil, adjust point in each of the two windows to minimize redisplay.
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195 This is convenient on slow terminals, but point can move strangely."
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196 :type 'boolean
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197 :group 'windows)
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198
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199 (defun split-window-vertically (&optional arg)
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200 "Split current window into two windows, one above the other.
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201 The uppermost window gets ARG lines and the other gets the rest.
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202 Negative arg means select the size of the lowermost window instead.
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203 With no argument, split equally or close to it.
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204 Both windows display the same buffer now current.
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205
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206 If the variable split-window-keep-point is non-nil, both new windows
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207 will get the same value of point as the current window. This is often
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208 more convenient for editing.
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209
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210 Otherwise, we chose window starts so as to minimize the amount of
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211 redisplay; this is convenient on slow terminals. The new selected
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212 window is the one that the current value of point appears in. The
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213 value of point can change if the text around point is hidden by the
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214 new mode line.
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215
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216 Programs should probably use split-window instead of this."
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217 (interactive "P")
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218 (let ((old-w (selected-window))
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219 (old-point (point))
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220 (size (and arg (prefix-numeric-value arg)))
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221 (window-full-p nil)
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222 new-w bottom moved)
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223 (and size (< size 0) (setq size (+ (window-height) size)))
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224 (setq new-w (split-window nil size))
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225 (or split-window-keep-point
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226 (progn
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227 (save-excursion
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228 (set-buffer (window-buffer))
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229 (goto-char (window-start))
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230 (setq moved (vertical-motion (window-height)))
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231 (set-window-start new-w (point))
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232 (if (> (point) (window-point new-w))
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233 (set-window-point new-w (point)))
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234 (and (= moved (window-height))
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235 (progn
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236 (setq window-full-p t)
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237 (vertical-motion -1)))
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238 (setq bottom (point)))
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239 (and window-full-p
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240 (<= bottom (point))
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241 (set-window-point old-w (1- bottom)))
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242 (and window-full-p
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243 (<= (window-start new-w) old-point)
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244 (progn
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245 (set-window-point new-w old-point)
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246 (select-window new-w)))))
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247 new-w))
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248
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249 (defun split-window-horizontally (&optional arg)
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250 "Split current window into two windows side by side.
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251 This window becomes the leftmost of the two, and gets ARG columns.
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252 Negative arg means select the size of the rightmost window instead.
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253 No arg means split equally."
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254 (interactive "P")
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255 (let ((size (and arg (prefix-numeric-value arg))))
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256 (and size (< size 0)
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257 (setq size (+ (window-width) size)))
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258 (split-window nil size t)))
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259
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260 (defun enlarge-window-horizontally (arg)
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261 "Make current window ARG columns wider."
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262 (interactive "p")
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263 (enlarge-window arg t))
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264
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265 (defun shrink-window-horizontally (arg)
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266 "Make current window ARG columns narrower."
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267 (interactive "p")
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268 (shrink-window arg t))
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269
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270 (defun shrink-window-if-larger-than-buffer (&optional window)
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271 "Shrink the WINDOW to be as small as possible to display its contents.
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272 Do not shrink to less than `window-min-height' lines.
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273 Do nothing if the buffer contains more lines than the present window height,
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274 or if some of the window's contents are scrolled out of view,
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275 or if the window is not the full width of the frame,
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276 or if the window is the only window of its frame."
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277 (interactive)
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278 (or window (setq window (selected-window)))
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279 (save-excursion
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280 (set-buffer (window-buffer window))
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281 (let* ((w (selected-window)) ;save-window-excursion can't win
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282 (buffer-file-name buffer-file-name)
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283 (p (point))
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284 (n 0)
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285 (ignore-final-newline
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286 ;; If buffer ends with a newline, ignore it when counting height
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287 ;; unless point is after it.
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288 (and (not (eobp))
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289 (eq ?\n (char-after (1- (point-max))))))
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290 (buffer-read-only nil)
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291 (modified (buffer-modified-p))
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292 (buffer (current-buffer))
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293 (mini (frame-property (window-frame window) 'minibuffer))
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294 (edges (window-pixel-edges (selected-window))))
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295 (if (and (< 1 (let ((frame (selected-frame)))
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296 (select-frame (window-frame window))
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297 (unwind-protect
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298 (count-windows)
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299 (select-frame frame))))
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300 ;; check to make sure that we don't have horizontally
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301 ;; split windows
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302 (eq (frame-highest-window (window-frame window) 0)
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303 (frame-highest-window (window-frame window) -1))
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304 (pos-visible-in-window-p (point-min) window)
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305 (not (eq mini 'only))
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306 (or (not mini) (eq mini t)
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307 (< (nth 3 edges)
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308 (nth 1 (window-pixel-edges mini)))
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309 (> (nth 1 edges)
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310 ;FSFmacs (frame-property (window-frame window)
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311 ; 'menu-bar-lines params)
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312 0)))
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313 (unwind-protect
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314 (let ((shrinkee (or window w)))
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315 (set-buffer (window-buffer shrinkee))
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316 (goto-char (point-min))
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317 (while (pos-visible-in-window-p
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318 (- (point-max)
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319 (if ignore-final-newline 1 0))
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320 shrinkee)
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321 ;; defeat file locking... don't try this at home, kids!
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322 (setq buffer-file-name nil)
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323 (insert ?\n) (setq n (1+ n)))
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324 (if (> n 0)
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325 (shrink-window (min (1- n)
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326 (- (window-height shrinkee)
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327 window-min-height))
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328 nil
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329 shrinkee)))
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330 (delete-region (point-min) (point))
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331 (set-buffer-modified-p modified)
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332 (goto-char p)
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333 ;; (select-window w) ; Emacs
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334 ;; Make sure we unbind buffer-read-only
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335 ;; with the proper current buffer.
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336 (set-buffer buffer))))))
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337
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338 (defun kill-buffer-and-window ()
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339 "Kill the current buffer and delete the selected window."
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340 (interactive)
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341 (if (yes-or-no-p (format "Kill buffer `%s'? " (buffer-name)))
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342 (let ((buffer (current-buffer)))
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343 (delete-window (selected-window))
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344 (kill-buffer buffer))
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345 (error "Aborted")))
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346
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347 ;;; New with XEmacs 20.3
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348 ;;; Suggested by Noah Friedman, and tuned by Hrvoje Niksic.
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349 (defun window-list (&optional minibuf all-frames device)
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350 "Return a list of existing windows.
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351 If the optional argument MINIBUF is non-nil, then include minibuffer
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352 windows in the result.
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353
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354 By default, only the windows in the selected frame are returned.
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355 The optional argument ALL-FRAMES changes this behavior:
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356 ALL-FRAMES = `visible' means include windows on all visible frames.
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357 ALL-FRAMES = 0 means include windows on all visible and iconified frames.
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358 ALL-FRAMES = t means include windows on all frames including invisible frames.
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359 Anything else means restrict to the selected frame.
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360 The optional fourth argument DEVICE further clarifies which frames to
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361 search as specified by ALL-FRAMES. This value is only meaningful if
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362 ALL-FRAMES is non-nil.
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363 If nil or omitted, search only the selected device.
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364 If a device, search frames only on that device.
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365 If a device type, search frames only on devices of that type.
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366 Any other non-nil value means search frames on all devices."
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367 (let ((wins nil))
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368 (walk-windows (lambda (win)
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369 (push win wins))
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370 minibuf all-frames device)
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371 wins))
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372
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373
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374 ;;; window.el ends here
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