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428
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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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444
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36 (defun one-window-p (&optional nomini which-frames which-devices)
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428
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37 "Return 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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444
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41 By default, only the windows in the selected frame are considered.
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42 The optional argument WHICH-FRAMES changes this behavior:
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43 WHICH-FRAMES nil or omitted means count only the selected frame,
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428
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44 plus the minibuffer it uses (which may be on another frame).
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444
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45 WHICH-FRAMES = `visible' means include windows on all visible frames.
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46 WHICH-FRAMES = 0 means include windows on all visible and iconified frames.
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47 WHICH-FRAMES = t means include windows on all frames including invisible frames.
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48 If WHICH-FRAMES is any other value, count only the selected frame.
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428
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49
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444
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50 The optional third argument WHICH-DEVICES further clarifies on which
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51 devices to search for frames as specified by WHICH-FRAMES. This value
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52 is only meaningful if WHICH-FRAMES is non-nil.
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53 If nil or omitted, search all devices on the selected console.
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54 If a device, only search that device.
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55 If a console, search all devices on that console.
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56 If a device type, search all devices of that type.
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57 If `window-system', search all devices on window-system consoles.
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58 Any other non-nil value means search all devices."
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428
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59 (let ((base-window (selected-window)))
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60 (if (and nomini (eq base-window (minibuffer-window)))
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61 (setq base-window (next-window base-window)))
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62 (eq base-window
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444
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63 (next-window base-window (if nomini 'arg) which-frames which-devices))))
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428
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64
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444
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65 (defun walk-windows (function &optional minibuf which-frames which-devices)
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66 "Cycle through all visible windows, calling FUNCTION for each one.
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67 FUNCTION is called with a window as argument.
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68
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69 Optional second arg MINIBUF t means count the minibuffer window even
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70 if not active. MINIBUF nil or omitted means count the minibuffer iff
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71 it is active. MINIBUF neither t nor nil means not to count the
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72 minibuffer even if it is active.
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73
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74 Several frames may share a single minibuffer; if the minibuffer
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75 counts, all windows on all frames that share that minibuffer count
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76 too. Therefore, when a separate minibuffer frame is active,
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77 `walk-windows' includes the windows in the frame from which you
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78 entered the minibuffer, as well as the minibuffer window. But if the
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444
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79 minibuffer does not count, only the selected window counts.
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80
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81 By default, only the windows in the selected frame are included.
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82 The optional argument WHICH-FRAMES changes this behavior:
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83 WHICH-FRAMES nil or omitted means cycle within the frames as specified above.
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84 WHICH-FRAMES = `visible' means include windows on all visible frames.
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85 WHICH-FRAMES = 0 means include windows on all visible and iconified frames.
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86 WHICH-FRAMES = t means include windows on all frames including invisible frames.
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428
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87 Anything else means restrict to WINDOW's frame.
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88
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444
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89 The optional fourth argument WHICH-DEVICES further clarifies on which
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90 devices to search for frames as specified by WHICH-FRAMES. This value
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91 is only meaningful if WHICH-FRAMES is non-nil.
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92 If nil or omitted, search all devices on the selected console.
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93 If a device, only search that device.
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94 If a console, search all devices on that console.
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95 If a device type, search all devices of that type.
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96 If `window-system', search all devices on window-system consoles.
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97 Any other non-nil value means search all devices."
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428
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98 ;; If we start from the minibuffer window, don't fail to come back to it.
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99 (if (window-minibuffer-p (selected-window))
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100 (setq minibuf t))
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101 ;; Note that, like next-window & previous-window, this behaves a little
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102 ;; strangely if the selected window is on an invisible frame: it hits
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103 ;; some of the windows on that frame, and all windows on visible frames.
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104 (let* ((walk-windows-start (selected-window))
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105 (walk-windows-current walk-windows-start))
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106 (while (progn
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107 (setq walk-windows-current
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444
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108 (next-window walk-windows-current minibuf which-frames
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109 which-devices))
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110 (funcall function walk-windows-current)
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428
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111 (not (eq walk-windows-current walk-windows-start))))))
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112 ;; The old XEmacs definition of the above clause. It's more correct in
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113 ;; that it will never hit a window that's already been hit even if you
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114 ;; do something odd like `delete-other-windows', but has the problem
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115 ;; that it conses. (This may be called repeatedly, from lazy-lock
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116 ;; for example.)
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117 ; (let* ((walk-windows-history nil)
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118 ; (walk-windows-current (selected-window)))
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119 ; (while (progn
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120 ; (setq walk-windows-current
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444
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121 ; (next-window walk-windows-current minibuf which-frames
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122 ; which-devices))
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428
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123 ; (not (memq walk-windows-current walk-windows-history)))
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124 ; (setq walk-windows-history (cons walk-windows-current
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125 ; walk-windows-history))
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444
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126 ; (funcall function walk-windows-current))))
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428
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127
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800
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128 (defun get-window-with-predicate (predicate &optional minibuf
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129 all-frames default)
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130 "Return a window satisfying PREDICATE.
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131
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132 This function cycles through all visible windows using `walk-windows',
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133 calling PREDICATE on each one. PREDICATE is called with a window as
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134 argument. The first window for which PREDICATE returns a non-nil
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135 value is returned. If no window satisfies PREDICATE, DEFAULT is
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136 returned.
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137
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138 Optional second arg MINIBUF t means count the minibuffer window even
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139 if not active. MINIBUF nil or omitted means count the minibuffer iff
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140 it is active. MINIBUF neither t nor nil means not to count the
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141 minibuffer even if it is active.
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142
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143 Several frames may share a single minibuffer; if the minibuffer
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144 counts, all windows on all frames that share that minibuffer count
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145 too. Therefore, if you are using a separate minibuffer frame
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146 and the minibuffer is active and MINIBUF says it counts,
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147 `walk-windows' includes the windows in the frame from which you
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148 entered the minibuffer, as well as the minibuffer window.
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149
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150 ALL-FRAMES is the optional third argument.
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151 ALL-FRAMES nil or omitted means cycle within the frames as specified above.
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152 ALL-FRAMES = `visible' means include windows on all visible frames.
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153 ALL-FRAMES = 0 means include windows on all visible and iconified frames.
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154 ALL-FRAMES = t means include windows on all frames including invisible frames.
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155 If ALL-FRAMES is a frame, it means include windows on that frame.
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156 Anything else means restrict to the selected frame."
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157 (catch 'found
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158 (walk-windows #'(lambda (window)
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159 (when (funcall predicate window)
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160 (throw 'found window)))
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161 minibuf all-frames)
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162 default))
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163
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164 (defalias 'some-window 'get-window-with-predicate)
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165
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428
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166 (defun minibuffer-window-active-p (window)
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167 "Return t if WINDOW (a minibuffer window) is now active."
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168 (eq window (active-minibuffer-window)))
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169
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170 (defmacro save-selected-window (&rest body)
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460
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171 "Execute BODY, then select the window that was selected before BODY.
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172 The value returned is the value of the last form in BODY."
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173 (let ((old-window (gensym "ssw")))
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174 `(let ((,old-window (selected-window)))
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442
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175 (unwind-protect
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176 (progn ,@body)
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460
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177 (when (window-live-p ,old-window)
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178 (select-window ,old-window))))))
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442
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179
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180 (defmacro with-selected-window (window &rest body)
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181 "Execute forms in BODY with WINDOW as the selected window.
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182 The value returned is the value of the last form in BODY."
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183 `(save-selected-window
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184 (select-window ,window)
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185 ,@body))
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186
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428
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187
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188 (defun count-windows (&optional minibuf)
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189 "Return the number of visible windows.
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800
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190 This counts the windows in the selected frame and (if the minibuffer is
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191 to be counted) its minibuffer frame (if that's not the same frame).
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192 The optional arg MINIBUF non-nil means count the minibuffer
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428
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193 even if it is inactive."
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194 (let ((count 0))
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195 (walk-windows (function (lambda (w)
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196 (setq count (+ count 1))))
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197 minibuf)
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198 count))
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199
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800
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200 (defun window-safely-shrinkable-p (&optional window)
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201 "Non-nil if the WINDOW can be shrunk without shrinking other windows.
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202 If WINDOW is nil or omitted, it defaults to the currently selected window."
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203 (save-selected-window
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204 (when window (select-window window))
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205 (or (and (not (eq window (frame-first-window)))
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206 (= (car (window-pixel-edges))
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207 (car (window-pixel-edges (previous-window)))))
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208 (= (car (window-pixel-edges))
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209 (car (window-pixel-edges (next-window)))))))
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210
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428
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211 (defun balance-windows ()
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212 "Make all visible windows the same height (approximately)."
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213 (interactive)
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214 (let ((count -1) levels newsizes size)
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215 ;FSFmacs
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216 ;;; Don't count the lines that are above the uppermost windows.
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217 ;;; (These are the menu bar lines, if any.)
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218 ;(mbl (nth 1 (window-edges (frame-first-window (selected-frame))))))
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219 ;; Find all the different vpos's at which windows start,
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220 ;; then count them. But ignore levels that differ by only 1.
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221 (save-window-excursion
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222 (let (tops (prev-top -2))
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223 (walk-windows (function (lambda (w)
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224 (setq tops (cons (nth 1 (window-pixel-edges w))
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225 tops))))
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226 'nomini)
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227 (setq tops (sort tops '<))
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228 (while tops
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229 (if (> (car tops) (1+ prev-top))
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230 (setq prev-top (car tops)
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231 count (1+ count)))
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232 (setq levels (cons (cons (car tops) count) levels))
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233 (setq tops (cdr tops)))
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234 (setq count (1+ count))))
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235 ;; Subdivide the frame into that many vertical levels.
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236 ;FSFmacs (setq size (/ (- (frame-height) mbl) count))
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237 (setq size (/ (window-pixel-height (frame-root-window)) count))
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238 (walk-windows (function
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239 (lambda (w)
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240 (select-window w)
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241 (let ((newtop (cdr (assq (nth 1 (window-pixel-edges))
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242 levels)))
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243 (newbot (or (cdr (assq
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244 (+ (window-pixel-height)
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245 (nth 1 (window-pixel-edges)))
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246 levels))
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247 count)))
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248 (setq newsizes
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249 (cons (cons w (* size (- newbot newtop)))
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250 newsizes)))))
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251 'nomini)
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252 (walk-windows (function (lambda (w)
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253 (select-window w)
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254 (let ((newsize (cdr (assq w newsizes))))
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255 (enlarge-window
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256 (/ (- newsize (window-pixel-height))
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257 (face-height 'default))))))
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258 'nomini)))
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259
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260 ;;; I think this should be the default; I think people will prefer it--rms.
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261 (defcustom split-window-keep-point t
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262 "*If non-nil, split windows keeps the original point in both children.
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263 This is often more convenient for editing.
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264 If nil, adjust point in each of the two windows to minimize redisplay.
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265 This is convenient on slow terminals, but point can move strangely."
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266 :type 'boolean
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267 :group 'windows)
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268
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269 (defun split-window-vertically (&optional arg)
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270 "Split current window into two windows, one above the other.
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271 The uppermost window gets ARG lines and the other gets the rest.
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272 Negative arg means select the size of the lowermost window instead.
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273 With no argument, split equally or close to it.
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274 Both windows display the same buffer now current.
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275
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730
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276 If the variable `split-window-keep-point' is non-nil, both new windows
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428
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277 will get the same value of point as the current window. This is often
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278 more convenient for editing.
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279
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280 Otherwise, we choose window starts so as to minimize the amount of
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428
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281 redisplay; this is convenient on slow terminals. The new selected
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282 window is the one that the current value of point appears in. The
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283 value of point can change if the text around point is hidden by the
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284 new mode line.
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285
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286 Programs should probably use split-window instead of this."
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287 (interactive "P")
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288 (let ((old-w (selected-window))
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289 (old-point (point))
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290 (size (and arg (prefix-numeric-value arg)))
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291 (window-full-p nil)
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292 new-w bottom moved)
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293 (and size (< size 0) (setq size (+ (window-height) size)))
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294 (setq new-w (split-window nil size))
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295 (or split-window-keep-point
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296 (progn
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297 (save-excursion
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298 (set-buffer (window-buffer))
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299 (goto-char (window-start))
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300 (setq moved (vertical-motion (window-height)))
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301 (set-window-start new-w (point))
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302 (if (> (point) (window-point new-w))
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303 (set-window-point new-w (point)))
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304 (and (= moved (window-height))
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305 (progn
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306 (setq window-full-p t)
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307 (vertical-motion -1)))
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308 (setq bottom (point)))
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309 (and window-full-p
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310 (<= bottom (point))
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311 (set-window-point old-w (1- bottom)))
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312 (and window-full-p
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313 (<= (window-start new-w) old-point)
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314 (progn
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315 (set-window-point new-w old-point)
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316 (select-window new-w)))))
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317 new-w))
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318
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319 (defun split-window-horizontally (&optional arg)
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320 "Split current window into two windows side by side.
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321 This window becomes the leftmost of the two, and gets ARG columns.
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322 Negative arg means select the size of the rightmost window instead.
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323 No arg means split equally."
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324 (interactive "P")
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325 (let ((size (and arg (prefix-numeric-value arg))))
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326 (and size (< size 0)
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327 (setq size (+ (window-width) size)))
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328 (split-window nil size t)))
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329
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330 (defun enlarge-window-horizontally (arg)
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331 "Make current window ARG columns wider."
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332 (interactive "p")
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333 (enlarge-window arg t))
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334
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335 (defun shrink-window-horizontally (arg)
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336 "Make current window ARG columns narrower."
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337 (interactive "p")
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338 (shrink-window arg t))
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339
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800
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340 ; (defun window-buffer-height (window)
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341 ; "Return the height (in screen lines) of the buffer that WINDOW is displaying."
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342 ; (save-excursion
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343 ; (set-buffer (window-buffer window))
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344 ; (goto-char (point-min))
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345 ; (let ((ignore-final-newline
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346 ; ;; If buffer ends with a newline, ignore it when counting height
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347 ; ;; unless point is after it.
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348 ; (and (not (eobp)) (eq ?\n (char-after (1- (point-max)))))))
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349 ; (+ 1 (nth 2 (compute-motion (point-min)
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350 ; '(0 . 0)
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351 ; (- (point-max) (if ignore-final-newline 1 0))
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352 ; (cons 0 100000000)
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353 ; (window-width window)
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354 ; nil
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355 ; window))))))
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356
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357 (defun count-screen-lines (&optional beg end count-final-newline window)
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358 "Return the number of screen lines in the region.
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359 The number of screen lines may be different from the number of actual lines,
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360 due to line breaking, display table, etc.
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361
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362 Optional arguments BEG and END default to `point-min' and `point-max'
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363 respectively.
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364
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365 If region ends with a newline, ignore it unless optional third argument
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366 COUNT-FINAL-NEWLINE is non-nil.
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367
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368 The optional fourth argument WINDOW specifies the window used for obtaining
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369 parameters such as width, horizontal scrolling, and so on. The default is
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370 to use the selected window's parameters.
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371
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372 Like `vertical-motion', `count-screen-lines' always uses the current buffer,
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373 regardless of which buffer is displayed in WINDOW. This makes possible to use
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374 `count-screen-lines' in any buffer, whether or not it is currently displayed
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375 in some window."
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376 (unless beg
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377 (setq beg (point-min)))
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378 (unless end
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379 (setq end (point-max)))
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380 (if (= beg end)
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381 0
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382 (save-excursion
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383 (save-restriction
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384 (widen)
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385 (narrow-to-region (min beg end)
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386 (if (and (not count-final-newline)
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387 (= ?\n (char-before (max beg end))))
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388 (1- (max beg end))
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389 (max beg end)))
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390 (goto-char (point-min))
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391 (1+ (vertical-motion (buffer-size) window))))))
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392
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393 ; (defun fit-window-to-buffer (&optional window max-height min-height)
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394 ; "Make WINDOW the right size to display its contents exactly.
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395 ; If WINDOW is omitted or nil, it defaults to the selected window.
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396 ; If the optional argument MAX-HEIGHT is supplied, it is the maximum height
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397 ; the window is allowed to be, defaulting to the frame height.
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398 ; If the optional argument MIN-HEIGHT is supplied, it is the minimum
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399 ; height the window is allowed to be, defaulting to `window-min-height'.
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400
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401 ; The heights in MAX-HEIGHT and MIN-HEIGHT include the mode-line and/or
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402 ; header-line."
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403 ; (interactive)
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404
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405 ; (when (null window)
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406 ; (setq window (selected-window)))
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407 ; (when (null max-height)
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408 ; (setq max-height (frame-height (window-frame window))))
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409
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410 ; (let* ((buf
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411 ; ;; Buffer that is displayed in WINDOW
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412 ; (window-buffer window))
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413 ; (window-height
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414 ; ;; The current height of WINDOW
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415 ; (window-height window))
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416 ; (desired-height
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417 ; ;; The height necessary to show the buffer displayed by WINDOW
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418 ; ;; (`count-screen-lines' always works on the current buffer).
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419 ; (with-current-buffer buf
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420 ; (+ (count-screen-lines)
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421 ; ;; If the buffer is empty, (count-screen-lines) is
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422 ; ;; zero. But, even in that case, we need one text line
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423 ; ;; for cursor.
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424 ; (if (= (point-min) (point-max))
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425 ; 1 0)
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426 ; ;; For non-minibuffers, count the mode-line, if any
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427 ; (if (and (not (window-minibuffer-p window))
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428 ; mode-line-format)
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429 ; 1 0)
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430 ; ;; Count the header-line, if any
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431 ; (if header-line-format 1 0))))
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432 ; (delta
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433 ; ;; Calculate how much the window height has to change to show
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434 ; ;; desired-height lines, constrained by MIN-HEIGHT and MAX-HEIGHT.
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435 ; (- (max (min desired-height max-height)
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436 ; (or min-height window-min-height))
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437 ; window-height))
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438 ; ;; We do our own height checking, so avoid any restrictions due to
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439 ; ;; window-min-height.
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440 ; (window-min-height 1))
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441
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442 ; ;; Don't try to redisplay with the cursor at the end
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443 ; ;; on its own line--that would force a scroll and spoil things.
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444 ; (when (with-current-buffer buf
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445 ; (and (eobp) (bolp) (not (bobp))))
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446 ; (set-window-point window (1- (window-point window))))
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447
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448 ; (save-selected-window
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449 ; (select-window window)
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450
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451 ; ;; Adjust WINDOW to the nominally correct size (which may actually
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452 ; ;; be slightly off because of variable height text, etc).
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453 ; (unless (zerop delta)
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454 ; (enlarge-window delta))
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455
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456 ; ;; Check if the last line is surely fully visible. If not,
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457 ; ;; enlarge the window.
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458 ; (let ((end (with-current-buffer buf
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459 ; (save-excursion
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460 ; (goto-char (point-max))
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461 ; (when (and (bolp) (not (bobp)))
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462 ; ;; Don't include final newline
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463 ; (backward-char 1))
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464 ; (when truncate-lines
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465 ; ;; If line-wrapping is turned off, test the
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466 ; ;; beginning of the last line for visibility
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467 ; ;; instead of the end, as the end of the line
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468 ; ;; could be invisible by virtue of extending past
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469 ; ;; the edge of the window.
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470 ; (forward-line 0))
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471 ; (point)))))
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472 ; (set-window-vscroll window 0)
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473 ; (while (and (< desired-height max-height)
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|
474 ; (= desired-height (window-height window))
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475 ; (not (pos-visible-in-window-p end window)))
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476 ; (enlarge-window 1)
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477 ; (setq desired-height (1+ desired-height)))))))
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478
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|
428
|
479 (defun shrink-window-if-larger-than-buffer (&optional window)
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480 "Shrink the WINDOW to be as small as possible to display its contents.
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481 Do not shrink to less than `window-min-height' lines.
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482 Do nothing if the buffer contains more lines than the present window height,
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483 or if some of the window's contents are scrolled out of view,
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484 or if the window is not the full width of the frame,
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485 or if the window is the only window of its frame."
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486 (interactive)
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487 (or window (setq window (selected-window)))
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488 (save-excursion
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489 (set-buffer (window-buffer window))
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|
490 (let ((n 0)
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491 (test-pos
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|
|
492 (- (point-max)
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|
493 ;; If buffer ends with a newline, ignore it when counting
|
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494 ;; height unless point is after it.
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495 (if (and (not (eobp))
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496 (eq ?\n (char-after (1- (point-max)))))
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497 1 0)))
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442
|
498 (mini (frame-property (window-frame window) 'minibuffer)))
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428
|
499 (if (and (< 1 (let ((frame (selected-frame)))
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|
500 (select-frame (window-frame window))
|
|
|
501 (unwind-protect
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|
502 (count-windows)
|
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503 (select-frame frame))))
|
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|
504 ;; check to make sure that the window is the full width
|
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|
505 ;; of the frame
|
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440
|
506 (window-leftmost-p window)
|
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|
507 (window-rightmost-p window)
|
|
428
|
508 ;; The whole buffer must be visible.
|
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|
509 (pos-visible-in-window-p (point-min) window)
|
|
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510 ;; The frame must not be minibuffer-only.
|
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|
511 (not (eq mini 'only)))
|
|
|
512 (progn
|
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|
513 (save-window-excursion
|
|
|
514 (goto-char (point-min))
|
|
|
515 (while (and (window-live-p window)
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|
516 (pos-visible-in-window-p test-pos window))
|
|
|
517 (shrink-window 1 nil window)
|
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|
518 (setq n (1+ n))))
|
|
|
519 (if (> n 0)
|
|
|
520 (shrink-window (min (1- n)
|
|
|
521 (- (window-height window)
|
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|
522 (1+ window-min-height)))
|
|
|
523 nil
|
|
|
524 window)))))))
|
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|
525
|
|
|
526 (defun kill-buffer-and-window ()
|
|
|
527 "Kill the current buffer and delete the selected window."
|
|
|
528 (interactive)
|
|
|
529 (if (yes-or-no-p (format "Kill buffer `%s'? " (buffer-name)))
|
|
|
530 (let ((buffer (current-buffer)))
|
|
|
531 (delete-window (selected-window))
|
|
|
532 (kill-buffer buffer))
|
|
|
533 (error "Aborted")))
|
|
|
534
|
|
730
|
535 (defun quit-window (&optional kill window)
|
|
|
536 "Quit the current buffer. Bury it, and maybe delete the selected frame.
|
|
|
537 \(The frame is deleted if it is contains a dedicated window for the buffer.)
|
|
|
538 With a prefix argument, kill the buffer instead.
|
|
|
539
|
|
|
540 Noninteractively, if KILL is non-nil, then kill the current buffer,
|
|
|
541 otherwise bury it.
|
|
428
|
542
|
|
730
|
543 If WINDOW is non-nil, it specifies a window; we delete that window,
|
|
|
544 and the buffer that is killed or buried is the one in that window."
|
|
|
545 (interactive "P")
|
|
|
546 (let ((buffer (window-buffer window))
|
|
|
547 (frame (window-frame (or window (selected-window))))
|
|
|
548 (window-solitary
|
|
|
549 (save-selected-window
|
|
|
550 (if window
|
|
|
551 (select-window window))
|
|
|
552 (one-window-p t)))
|
|
|
553 window-handled)
|
|
444
|
554
|
|
730
|
555 (save-selected-window
|
|
|
556 (if window
|
|
|
557 (select-window window))
|
|
|
558 (or (window-minibuffer-p)
|
|
|
559 (window-dedicated-p (selected-window))
|
|
|
560 (switch-to-buffer (other-buffer))))
|
|
|
561
|
|
|
562 ;; Get rid of the frame, if it has just one dedicated window
|
|
|
563 ;; and other visible frames exist.
|
|
|
564 (and (or (window-minibuffer-p) (window-dedicated-p window))
|
|
|
565 (delq frame (visible-frame-list))
|
|
|
566 window-solitary
|
|
|
567 (if (and (eq default-minibuffer-frame frame)
|
|
|
568 (= 1 (length (minibuffer-frame-list))))
|
|
|
569 (setq window nil)
|
|
|
570 (delete-frame frame)
|
|
|
571 (setq window-handled t)))
|
|
|
572
|
|
|
573 ;; Deal with the buffer.
|
|
|
574 (if kill
|
|
|
575 (kill-buffer buffer)
|
|
|
576 (bury-buffer buffer))
|
|
|
577
|
|
|
578 ;; Maybe get rid of the window.
|
|
|
579 (and window (not window-handled) (not window-solitary)
|
|
|
580 (delete-window window))))
|
|
428
|
581
|
|
|
582 ;;; window.el ends here
|
