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155
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1 ;;; window-xemacs.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: extensions
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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: Not synched.
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27
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28 ;;; Commentary:
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29
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30 ;; slb - 5/29/97
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31 ;; Split apart from window.el in order to keep that file better in synch
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32 ;; with Emacs.
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33
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34 ;;; Code:
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35
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36 (defun backward-other-window (arg &optional all-frames device)
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37 "Select the ARG'th different window on this frame, going backwards.
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38 This is just like calling `other-window' with the arg negated."
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39 (interactive "p")
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40 (other-window (- arg) all-frames device))
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41
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42 (defun windows-of-buffer (&optional buffer)
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43 "Returns a list of windows that have BUFFER in them.
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44 If BUFFER is not specified, the current buffer will be used."
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45 (or (bufferp buffer)
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46 (if (stringp buffer)
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47 (setq buffer (or (get-buffer buffer)
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48 (get-file-buffer buffer)))
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49 (setq buffer (current-buffer))))
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50 (let* ((firstwin (next-window nil nil t))
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51 (wind firstwin)
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52 (done nil)
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53 window-list)
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54 (while (not done)
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55 (if (eq (window-buffer wind) buffer)
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56 (setq window-list (append window-list (list wind))))
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57 (setq wind (next-window wind nil t))
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58 (setq done (eq wind firstwin)))
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59 window-list))
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60
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61 (defun buffer-in-multiple-windows-p (&optional buffer)
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62 "Return t if BUFFER is in multiple windows.
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63 If BUFFER is not specified, the current buffer will be used."
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64 (setq buffer (or buffer
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65 (get-buffer buffer)
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66 (get-file-buffer buffer)
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67 (current-buffer)))
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68 (> (length (windows-of-buffer buffer)) 1))
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69
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70 (defun window-list (&optional frame minibuf window)
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71 "Return a list of windows on FRAME, beginning with WINDOW.
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72 FRAME and WINDOW default to the selected ones.
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73 Optional second arg MINIBUF t means count the minibuffer window
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74 even if not active. If MINIBUF is neither t nor nil it means
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75 not to count the minibuffer even if it is active."
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76 (setq window (or window (selected-window))
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77 frame (or frame (selected-frame)))
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78 (if (not (eq (window-frame window) frame))
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79 (error "Window must be on frame."))
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80 (let ((current-frame (selected-frame))
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81 list)
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82 (unwind-protect
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83 (save-window-excursion
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84 (select-frame frame)
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85 (walk-windows
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86 (function (lambda (cur-window)
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87 (if (not (eq window cur-window))
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88 (setq list (cons cur-window list)))))
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89 minibuf)
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90 (setq list (cons window list)))
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91 (select-frame current-frame))))
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92
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93 ;; We used to have set-window-dedicated-p as an obsolete version
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94 ;; of set-window-buffer-dedicated, but it really makes more sense
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95 ;; this way.
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96
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97 (make-obsolete 'set-window-buffer-dedicated 'set-window-dedicated-p)
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98 (defun set-window-buffer-dedicated (window buffer)
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99 "Make WINDOW display BUFFER and be dedicated to that buffer.
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100 Then Emacs will not automatically change which buffer appears in WINDOW.
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101 If BUFFER is nil, make WINDOW not be dedicated (but don't change which
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102 buffer appears in it currently)."
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103 (if (bufferp buffer)
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104 (set-window-buffer window (get-buffer-create buffer)))
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105 (set-window-dedicated-p window (not (null buffer))))
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106
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107
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108 ;; The window-config stack is stored as a list in frame property
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109 ;; 'window-config-stack, with the most recent element at the front.
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110 ;; When you pop off an element, the popped off element gets put at the
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111 ;; front of frame property 'window-config-unpop-stack, so you can
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112 ;; retrieve it using unpop-window-configuration.
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113
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114 (defvar window-config-stack-max 16
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115 "*Maximum size of window configuration stack.
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116 Start discarding off end if it gets this big.")
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117
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118 (defun window-config-stack (&optional frame)
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119 (or frame (setq frame (selected-frame)))
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120 (let ((stack (frame-property frame 'window-config-stack)))
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121 (if stack
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122 (set-undoable-stack-max stack window-config-stack-max)
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123 (progn
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124 (setq stack (make-undoable-stack window-config-stack-max))
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125 (set-frame-property frame 'window-config-stack stack)))
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126 stack))
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127
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128 (defun push-window-configuration (&optional config)
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129 "Push the current window configuration onto the window-config stack.
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130 If CONFIG is specified, push it instead of the current window configuration.
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131 Each frame has its own window-config stack."
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132 (interactive)
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133 (let ((wc (or config (current-window-configuration)))
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134 (stack (window-config-stack)))
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135 (if (or (= 0 (undoable-stack-a-length stack))
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136 (not (equal (undoable-stack-a-top stack) wc)))
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137 (progn
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138 (undoable-stack-push stack wc)
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139 ;; kludge.
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140 (if (featurep 'toolbar)
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141 (set-specifier-dirty-flag default-toolbar))))))
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142
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143 (defun pop-window-configuration ()
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144 "Pop the top window configuration off the window-config stack and set it.
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145 Before setting the new window configuration, the current window configuration
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146 is pushed onto the \"unpop\" stack.
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147 `unpop-window-configuration' undoes what this function does.
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148 Each frame has its own window-config and \"unpop\" stack."
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149 (interactive)
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150 (let ((stack (window-config-stack))
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151 (wc (current-window-configuration))
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152 popped)
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153 (condition-case nil
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154 (progn
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155 (setq popped (undoable-stack-pop stack))
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156 (while (equal popped wc)
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157 (setq popped (undoable-stack-pop stack)))
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158 (undoable-stack-push stack wc)
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159 (undoable-stack-undo stack)
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160 (set-window-configuration popped)
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161 ;; probably not necessary:
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162 (if (featurep 'toolbar)
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163 (set-specifier-dirty-flag default-toolbar))
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164 popped)
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165 (trunc-stack-bottom
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166 (error "Bottom of window config stack")))))
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167
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168 (defun unpop-window-configuration ()
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169 "Undo the effect of the most recent `pop-window-configuration'.
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170 This does exactly the inverse of what `pop-window-configuration' does:
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171 i.e. it pops a window configuration off of the \"unpop\" stack and
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172 pushes the current window configuration onto the window-config stack.
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173 Each frame has its own window-config and \"unpop\" stack."
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174 (interactive)
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175 (let ((stack (window-config-stack))
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176 (wc (current-window-configuration))
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177 popped)
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178 (condition-case nil
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179 (progn
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180 (setq popped
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181 (progn
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182 (undoable-stack-redo stack)
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183 (undoable-stack-pop stack)))
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184 (while (equal popped wc)
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185 (setq popped
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186 (progn
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187 (undoable-stack-redo stack)
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188 (undoable-stack-pop stack))))
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189 (undoable-stack-push stack wc)
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190 (set-window-configuration popped)
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191 ;; probably not necessary:
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192 (if (featurep 'toolbar)
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193 (set-specifier-dirty-flag default-toolbar))
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194 popped)
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195 (trunc-stack-bottom
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196 (error "Top of window config stack")))))
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197
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198
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199 ;;;;;;;;;;;;; display-buffer, moved here from C. Hallelujah.
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200
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201 (defvar display-buffer-function nil
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202 "If non-nil, function to call to handle `display-buffer'.
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203 It will receive three args: the same as those to `display-buffer'.")
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204
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205 (defvar pre-display-buffer-function nil
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206 "If non-nil, function that will be called from `display-buffer'
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207 as the first action. It will receive three args: the same as those
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208 to `display-buffer'.
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209 This function may be used to select an appropriate frame for the buffer,
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210 for example. See also the variable `display-buffer-function', which may
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211 be used to completely replace the `display-buffer' function.
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212 If the return value of this function is non-nil, it should be a frame,
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213 and that frame will be used to display the buffer.")
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214
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215 (defvar pop-up-frames nil
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216 "*Non-nil means `display-buffer' should make a separate frame.")
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217
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218 (defvar pop-up-frame-function nil
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219 "Function to call to handle automatic new frame creation.
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220 It is called with no arguments and should return a newly created frame.
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221
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222 A typical value might be `(lambda () (new-frame pop-up-frame-alist))'
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223 where `pop-up-frame-alist' would hold the default frame parameters.")
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224
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225 (defvar special-display-buffer-names nil
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226 "*List of buffer names that should have their own special frames.
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227 Displaying a buffer whose name is in this list makes a special frame for it
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228 using `special-display-function'.
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229
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230 An element of the list can be a cons cell instead of just a string.
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231 Then the car should be a buffer name, and the cdr specifies frame
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232 parameters for creating the frame for that buffer.
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233 More precisely, the cdr is passed as the second argument to
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234 the function found in `special-display-function', when making that frame.
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235 See also `special-display-regexps'.")
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236
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237 (defvar special-display-regexps nil
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238 "*List of regexps saying which buffers should have their own special frames.
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239 If a buffer name matches one of these regexps, it gets its own frame.
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240 Displaying a buffer whose name is in this list makes a special frame for it
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241 using `special-display-function'.
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242
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243 An element of the list can be a cons cell instead of just a string.
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244 Then the car should be the regexp, and the cdr specifies frame
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245 parameters for creating the frame for buffers that match.
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246 More precisely, the cdr is passed as the second argument to
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247 the function found in `special-display-function', when making that frame.
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248 See also `special-display-buffer-names'.")
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249
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250 (defvar special-display-function nil
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251 "Function to call to make a new frame for a special buffer.
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252 It is called with two arguments, the buffer and optional buffer specific
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253 data, and should return a window displaying that buffer.
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254 The default value makes a separate frame for the buffer,
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255 using `special-display-frame-alist' to specify the frame parameters.
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256
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257 A buffer is special if its is listed in `special-display-buffer-names'
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258 or matches a regexp in `special-display-regexps'.")
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259
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260 (defvar same-window-buffer-names nil
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261 "*List of buffer names that should appear in the selected window.
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262 Displaying one of these buffers using `display-buffer' or `pop-to-buffer'
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263 switches to it in the selected window, rather than making it appear
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264 in some other window.
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265
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266 An element of the list can be a cons cell instead of just a string.
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267 Then the car must be a string, which specifies the buffer name.
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268 This is for compatibility with `special-display-buffer-names';
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269 the cdr of the cons cell is ignored.
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270
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271 See also `same-window-regexps'.")
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272
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273 (defvar same-window-regexps nil
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274 "*List of regexps saying which buffers should appear in the selected window.
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275 If a buffer name matches one of these regexps, then displaying it
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276 using `display-buffer' or `pop-to-buffer' switches to it
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277 in the selected window, rather than making it appear in some other window.
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278
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279 An element of the list can be a cons cell instead of just a string.
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280 Then the car must be a string, which specifies the buffer name.
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281 This is for compatibility with `special-display-buffer-names';
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282 the cdr of the cons cell is ignored.
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283
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284 See also `same-window-buffer-names'.")
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285
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286 (defvar pop-up-windows t
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287 "*Non-nil means display-buffer should make new windows.")
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288
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289 (defvar split-height-threshold 500
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290 "*display-buffer would prefer to split the largest window if this large.
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291 If there is only one window, it is split regardless of this value.")
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292
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293 (defvar split-width-threshold 500
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294 "*display-buffer would prefer to split the largest window if this large.
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295 If there is only one window, it is split regardless of this value.")
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296
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297 ;; Deiconify the frame containing the window WINDOW, then return WINDOW.
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298
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299 (defun display-buffer-1 (window)
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300 (if (frame-iconified-p (window-frame window))
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301 (make-frame-visible (window-frame window)))
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302 window)
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303
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304 ;; Can you believe that all of this crap was formerly in C?
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305 ;; Praise Jesus that it's not there any more.
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306
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307 (defun display-buffer (buffer &optional not-this-window-p override-frame)
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308 "Make BUFFER appear in some window on the current frame, but don't select it.
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309 BUFFER can be a buffer or a buffer name.
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310 If BUFFER is shown already in some window in the current frame,
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311 just uses that one, unless the window is the selected window and
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312 NOT-THIS-WINDOW-P is non-nil (interactively, with prefix arg).
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313
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314 If BUFFER has a dedicated frame, display on that frame instead of
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315 the current frame, unless OVERRIDE-FRAME is non-nil.
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316
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317 If OVERRIDE-FRAME is non-nil, display on that frame instead of
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318 the current frame (or the dedicated frame).
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319
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320 If `pop-up-windows' is non-nil, always use the
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321 current frame and create a new window regardless of whether the
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322 buffer has a dedicated frame, and regardless of whether
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323 OVERRIDE-FRAME was specified.
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324
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325 If `pop-up-frames' is non-nil, make a new frame if no window shows BUFFER.
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326
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327 Returns the window displaying BUFFER."
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328 (interactive "BDisplay buffer:\nP")
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329
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330 (let ((wconfig (current-window-configuration))
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331 (result
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332 ;; We just simulate a `return' in C. This function is way ugly
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333 ;; and does `returns' all over the place and there's no sense
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334 ;; in trying to rewrite it to be more Lispy.
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335 (catch 'done
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336 (let (window old-frame target-frame explicit-frame)
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337 (setq old-frame (or (last-nonminibuf-frame) (selected-frame)))
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338 (setq buffer (get-buffer buffer))
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339 (check-argument-type 'bufferp buffer)
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340
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341 (setq explicit-frame
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342 (if pre-display-buffer-function
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343 (funcall pre-display-buffer-function buffer
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344 not-this-window-p
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345 override-frame)))
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346
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347 ;; Give the user the ability to completely reimplement
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348 ;; this function via the `display-buffer-function'.
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349 (if display-buffer-function
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350 (throw 'done
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351 (funcall display-buffer-function buffer
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352 not-this-window-p
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353 override-frame)))
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354
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355 ;; If the buffer has a dedicated frame, that takes
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356 ;; precedence over the current frame, and over what the
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357 ;; pre-display-buffer-function did.
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358 (let ((dedi (buffer-dedicated-frame buffer)))
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359 (if (frame-live-p dedi) (setq explicit-frame dedi)))
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360
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361 ;; if override-frame is supplied, that takes precedence over
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362 ;; everything. This is gonna look bad if the
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363 ;; pre-display-buffer-function raised some other frame
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364 ;; already.
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365 (if override-frame
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366 (progn
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367 (check-argument-type 'frame-live-p override-frame)
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368 (setq explicit-frame override-frame)))
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369
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370 (setq target-frame
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371 (or explicit-frame
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372 (last-nonminibuf-frame)
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373 (selected-frame)))
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374
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375 ;; If we have switched frames, then set not-this-window-p
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376 ;; to false. Switching frames means that selected-window
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377 ;; is no longer the same as it was on entry -- it's the
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378 ;; selected-window of target_frame instead of old_frame,
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379 ;; so it's a fine candidate for display.
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380 (if (not (eq old-frame target-frame))
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381 (setq not-this-window-p nil))
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382
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383 ;; if it's in the selected window, and that's ok, then we're done.
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384 (if (and (not not-this-window-p)
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385 (eq buffer (window-buffer (selected-window))))
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386 (throw 'done (display-buffer-1 (selected-window))))
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387
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388 ;; See if the user has specified this buffer should appear
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389 ;; in the selected window.
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390
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391 (if not-this-window-p
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392 nil
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393
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394 (if (or (member (buffer-name buffer) same-window-buffer-names)
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395 (assoc (buffer-name buffer) same-window-buffer-names))
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396 (progn
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397 (switch-to-buffer buffer)
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398 (throw 'done (display-buffer-1 (selected-window)))))
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399
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400 (let ((tem same-window-regexps))
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401 (while tem
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402 (let ((car (car tem)))
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403 (if (or
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404 (and (stringp car)
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405 (string-match car (buffer-name buffer)))
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406 (and (consp car) (stringp (car car))
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407 (string-match (car car) (buffer-name buffer))))
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408 (progn
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409 (switch-to-buffer buffer)
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410 (throw 'done (display-buffer-1
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411 (selected-window))))))
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412 (setq tem (cdr tem)))))
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413
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414 ;; If pop-up-frames, look for a window showing BUFFER on
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415 ;; any visible or iconified frame. Otherwise search only
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416 ;; the current frame.
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417 (if (and (not explicit-frame)
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418 (or pop-up-frames (not (last-nonminibuf-frame))))
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419 (setq target-frame 0))
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420
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421 ;; Otherwise, find some window that it's already in, and
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422 ;; return that, unless that window is the selected window
|
|
|
423 ;; and that isn't ok. What a contorted mess!
|
|
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424 (setq window (get-buffer-window buffer target-frame))
|
|
|
425 (if (and window
|
|
|
426 (or (not not-this-window-p)
|
|
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427 (not (eq window (selected-window)))))
|
|
|
428 (throw 'done (display-buffer-1 window)))
|
|
|
429
|
|
|
430 ;; Certain buffer names get special handling.
|
|
|
431 (if special-display-function
|
|
|
432 (progn
|
|
|
433 (if (member (buffer-name buffer)
|
|
|
434 special-display-buffer-names)
|
|
|
435 (throw 'done (funcall special-display-function buffer)))
|
|
|
436
|
|
|
437 (let ((tem (assoc (buffer-name buffer)
|
|
|
438 special-display-buffer-names)))
|
|
|
439 (if tem
|
|
|
440 (throw 'done (funcall special-display-function
|
|
|
441 buffer (cdr tem)))))
|
|
|
442
|
|
|
443 (let ((tem special-display-regexps))
|
|
|
444 (while tem
|
|
|
445 (let ((car (car tem)))
|
|
|
446 (if (and (stringp car)
|
|
|
447 (string-match car (buffer-name buffer)))
|
|
|
448 (throw 'done
|
|
|
449 (funcall special-display-function buffer)))
|
|
|
450 (if (and (consp car)
|
|
|
451 (stringp (car car))
|
|
|
452 (string-match (car car)
|
|
|
453 (buffer-name buffer)))
|
|
|
454 (throw 'done (funcall
|
|
|
455 special-display-function buffer
|
|
|
456 (cdr car)))))
|
|
|
457 (setq tem (cdr tem))))))
|
|
|
458
|
|
|
459 ;; If there are no frames open that have more than a minibuffer,
|
|
|
460 ;; we need to create a new frame.
|
|
|
461 (if (or pop-up-frames
|
|
|
462 (null (last-nonminibuf-frame)))
|
|
|
463 (progn
|
|
|
464 (setq window (frame-selected-window
|
|
|
465 (funcall pop-up-frame-function)))
|
|
|
466 (set-window-buffer window buffer)
|
|
|
467 (throw 'done (display-buffer-1 window))))
|
|
|
468
|
|
|
469 ;; Otherwise, make it be in some window, splitting if
|
|
|
470 ;; appropriate/possible. Do not split a window if we are
|
|
|
471 ;; displaying the buffer in a different frame than that which
|
|
|
472 ;; was current when we were called. (It is already in a
|
|
|
473 ;; different window by virtue of being in another frame.)
|
|
|
474 (if (or (and pop-up-windows (eq target-frame old-frame))
|
|
|
475 (eq 'only (frame-property (selected-frame) 'minibuffer))
|
|
|
476 ;; If the current frame is a special display frame,
|
|
|
477 ;; don't try to reuse its windows.
|
|
|
478 (window-dedicated-p (frame-root-window (selected-frame))))
|
|
|
479 (progn
|
|
|
480 (if (eq 'only (frame-property (selected-frame) 'minibuffer))
|
|
|
481 (setq target-frame (last-nonminibuf-frame)))
|
|
|
482
|
|
|
483 ;; Don't try to create a window if would get an error with
|
|
|
484 ;; height.
|
|
|
485 (if (< split-height-threshold (* 2 window-min-height))
|
|
|
486 (setq split-height-threshold (* 2 window-min-height)))
|
|
|
487
|
|
|
488 ;; Same with width.
|
|
|
489 (if (< split-width-threshold (* 2 window-min-width))
|
|
|
490 (setq split-width-threshold (* 2 window-min-width)))
|
|
|
491
|
|
|
492 ;; If the frame we would try to split cannot be split,
|
|
|
493 ;; try other frames.
|
|
|
494 (if (frame-property (if (null target-frame)
|
|
|
495 (selected-frame)
|
|
|
496 (last-nonminibuf-frame))
|
|
|
497 'unsplittable)
|
|
|
498 (setq window
|
|
|
499 ;; Try visible frames first.
|
|
|
500 (or (get-largest-window 'visible)
|
|
|
501 ;; If that didn't work, try iconified frames.
|
|
|
502 (get-largest-window 0)
|
|
|
503 (get-largest-window t)))
|
|
|
504 (setq window (get-largest-window target-frame)))
|
|
|
505
|
|
|
506 ;; If we got a tall enough full-width window that
|
|
|
507 ;; can be split, split it.
|
|
|
508 (if (and window
|
|
|
509 (not (frame-property (window-frame window)
|
|
|
510 'unsplittable))
|
|
|
511 (>= (window-height window) split-height-threshold)
|
|
|
512 (or (>= (window-width window)
|
|
|
513 split-width-threshold)
|
|
|
514 (and (window-leftmost-p window)
|
|
|
515 (window-rightmost-p window))))
|
|
|
516 (setq window (split-window window))
|
|
|
517 (let (upper
|
|
|
518 ;; lower
|
|
|
519 other)
|
|
|
520 (setq window (get-lru-window target-frame))
|
|
|
521 ;; If the LRU window is selected, and big enough,
|
|
|
522 ;; and can be split, split it.
|
|
|
523 (if (and window
|
|
|
524 (not (frame-property (window-frame window)
|
|
|
525 'unsplittable))
|
|
|
526 (or (eq window (selected-window))
|
|
|
527 (not (window-parent window)))
|
|
|
528 (>= (window-height window)
|
|
|
529 (* 2 window-min-height)))
|
|
|
530 (setq window (split-window window)))
|
|
|
531 ;; If get-lru-window returned nil, try other approaches.
|
|
|
532 ;; Try visible frames first.
|
|
|
533 (or window
|
|
|
534 (setq window (or (get-largest-window 'visible)
|
|
|
535 ;; If that didn't work, try
|
|
|
536 ;; iconified frames.
|
|
|
537 (get-largest-window 0)
|
|
|
538 ;; Try invisible frames.
|
|
|
539 (get-largest-window t)
|
|
|
540 ;; As a last resort, make
|
|
|
541 ;; a new frame.
|
|
|
542 (frame-selected-window
|
|
|
543 (funcall
|
|
|
544 pop-up-frame-function)))))
|
|
|
545 ;; If window appears above or below another,
|
|
|
546 ;; even out their heights.
|
|
|
547 (if (window-previous-child window)
|
|
|
548 (setq other (window-previous-child window)
|
|
|
549 ;; lower window
|
|
|
550 upper other))
|
|
|
551 (if (window-next-child window)
|
|
|
552 (setq other (window-next-child window)
|
|
|
553 ;; lower other
|
|
|
554 upper window))
|
|
|
555 ;; Check that OTHER and WINDOW are vertically arrayed.
|
|
|
556 (if (and other
|
|
|
557 (not (= (nth 1 (window-pixel-edges other))
|
|
|
558 (nth 1 (window-pixel-edges window))))
|
|
|
559 (> (window-pixel-height other)
|
|
|
560 (window-pixel-height window)))
|
|
|
561 (enlarge-window (- (/ (+ (window-height other)
|
|
|
562 (window-height window))
|
|
|
563 2)
|
|
|
564 (window-height upper))
|
|
|
565 nil upper)))))
|
|
|
566
|
|
|
567 (setq window (get-lru-window target-frame)))
|
|
|
568
|
|
|
569 ;; Bring the window's previous buffer to the top of the MRU chain.
|
|
|
570 (if (window-buffer window)
|
|
|
571 (save-excursion
|
|
|
572 (save-selected-window
|
|
|
573 (select-window window)
|
|
|
574 (record-buffer (window-buffer window)))))
|
|
|
575
|
|
|
576 (set-window-buffer window buffer)
|
|
|
577
|
|
|
578 (display-buffer-1 window)))))
|
|
|
579 (or (equal wconfig (current-window-configuration))
|
|
|
580 (push-window-configuration wconfig))
|
|
|
581 result))
|
|
|
582
|
|
|
583 ;;; window-xemacs.el ends here
|
