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1 ;; Dialog-box support.
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2 ;; Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
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3
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4 ;; This file is part of XEmacs.
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5
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6 ;; XEmacs is free software; you can redistribute it and/or modify it
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7 ;; under the terms of the GNU General Public License as published by
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8 ;; the Free Software Foundation; either version 2, or (at your option)
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9 ;; any later version.
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10
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11 ;; XEmacs is distributed in the hope that it will be useful, but
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12 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ;; General Public License for more details.
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15
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16 ;; You should have received a copy of the GNU General Public License
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17 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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18 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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19
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20 ;;; Synched up with: Not in FSF.
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21
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22 (defun yes-or-no-p-dialog-box (prompt)
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23 "Ask user a \"y or n\" question with a popup dialog box.
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24 Returns t if answer is \"yes\".
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25 Takes one argument, which is the string to display to ask the question."
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26 (let ((echo-keystrokes 0)
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27 event)
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28 (popup-dialog-box
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29 ;; "Non-violent language please!" says Robin.
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30 (cons prompt '(["Yes" yes t] ["No" no t] nil ["Cancel" abort t])))
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31 ; (cons prompt '(["Yes" yes t] ["No" no t] nil ["Abort" abort t])))
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32 (catch 'ynp-done
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33 (while t
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34 (setq event (next-command-event event))
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35 (cond ((and (misc-user-event-p event) (eq (event-object event) 'yes))
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36 (throw 'ynp-done t))
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37 ((and (misc-user-event-p event) (eq (event-object event) 'no))
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38 (throw 'ynp-done nil))
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39 ((and (misc-user-event-p event)
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40 (or (eq (event-object event) 'abort)
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41 (eq (event-object event) 'menu-no-selection-hook)))
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42 (signal 'quit nil))
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43 ((button-release-event-p event) ;; don't beep twice
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44 nil)
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45 (t
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46 (beep)
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47 (message "please answer the dialog box")))))))
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48
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49 (defun yes-or-no-p-maybe-dialog-box (prompt)
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50 "Ask user a yes-or-no question. Return t if answer is yes.
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51 The question is asked with a dialog box or the minibuffer, as appropriate.
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52 Takes one argument, which is the string to display to ask the question.
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53 It should end in a space; `yes-or-no-p' adds `(yes or no) ' to it.
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54 The user must confirm the answer with RET,
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55 and can edit it until it as been confirmed."
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56 (if (should-use-dialog-box-p)
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57 (yes-or-no-p-dialog-box prompt)
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58 (yes-or-no-p-minibuf prompt)))
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59
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60 (defun y-or-n-p-maybe-dialog-box (prompt)
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61 "Ask user a \"y or n\" question. Return t if answer is \"y\".
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62 Takes one argument, which is the string to display to ask the question.
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63 The question is asked with a dialog box or the minibuffer, as appropriate.
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64 It should end in a space; `y-or-n-p' adds `(y or n) ' to it.
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65 No confirmation of the answer is requested; a single character is enough.
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66 Also accepts Space to mean yes, or Delete to mean no."
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67 (if (should-use-dialog-box-p)
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68 (yes-or-no-p-dialog-box prompt)
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69 (y-or-n-p-minibuf prompt)))
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70
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71 (if (fboundp 'popup-dialog-box)
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72 (progn
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73 (fset 'yes-or-no-p 'yes-or-no-p-maybe-dialog-box)
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74 (fset 'y-or-n-p 'y-or-n-p-maybe-dialog-box)))
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75
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76 ;; this is call-compatible with the horribly-named FSF Emacs function
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77 ;; `x-popup-dialog'. I refuse to use that name.
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78 (defun get-dialog-box-response (position contents)
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79 ;; by Stig@hackvan.com
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80 ;; modified by pez@atlantic2.sbi.com
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81 "Pop up a dialog box and return user's selection.
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82 POSITION specifies which frame to use.
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83 This is normally an event or a window or frame.
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84 If POSITION is t or nil, it means to use the frame the mouse is on.
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85 The dialog box appears in the middle of the specified frame.
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86
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87 CONTENTS specifies the alternatives to display in the dialog box.
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88 It is a list of the form (TITLE ITEM1 ITEM2...).
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89 Each ITEM is a cons cell (STRING . VALUE).
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90 The return value is VALUE from the chosen item.
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91
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92 An ITEM may also be just a string--that makes a nonselectable item.
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93 An ITEM may also be nil--that means to put all preceding items
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94 on the left of the dialog box and all following items on the right."
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95 (cond
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96 ((eventp position)
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97 (select-frame (event-frame position)))
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98 ((framep position)
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99 (select-frame position))
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100 ((windowp position)
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101 (select-window position)))
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102 (let ((dbox (cons (car contents)
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103 (mapcar #'(lambda (x)
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104 (cond
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105 ((null x)
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106 nil)
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107 ((stringp x)
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108 `[,x 'ignore nil]) ;this will never get
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109 ;selected
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110 (t
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111 `[,(car x) (throw 'result ',(cdr x)) t])))
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112 (cdr contents))
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113 )))
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114 (catch 'result
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115 (popup-dialog-box dbox)
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116 (dispatch-event (next-command-event)))))
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117
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118 (defun message-box (fmt &rest args)
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119 "Display a message, in a dialog box if possible.
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120 If the selected device has no dialog-box support, use the echo area.
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121 The arguments are the same as to `format'.
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122
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123 If the only argument is nil, clear any existing message; let the
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124 minibuffer contents show."
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125 (if (and (null fmt) (null args))
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126 (progn
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127 (clear-message nil)
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128 nil)
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129 (let ((str (apply 'format fmt args)))
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130 (if (device-on-window-system-p)
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131 (get-dialog-box-response nil (list str (cons "OK" t)))
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132 (display-message 'message str))
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133 str)))
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134
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135 (defun message-or-box (fmt &rest args)
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136 "Display a message in a dialog box or in the echo area.\n\
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137 If this command was invoked with the mouse, use a dialog box.\n\
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138 Otherwise, use the echo area.
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139 The arguments are the same as to `format'.
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140
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141 If the only argument is nil, clear any existing message; let the
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142 minibuffer contents show."
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143 (if (should-use-dialog-box-p)
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144 (apply 'message-box fmt args)
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145 (apply 'message fmt args)))
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