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1 ;;; w3-widget.el --- An image widget
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2 ;; Author: wmperry
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3 ;; Created: 1997/04/07 16:00:02
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4 ;; Version: 1.28
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5 ;; Keywords: faces, images
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6
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7 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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8 ;;; Copyright (c) 1993 - 1996 by William M. Perry (wmperry@cs.indiana.edu)
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9 ;;; Copyright (c) 1996, 1997 Free Software Foundation, Inc.
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10 ;;;
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11 ;;; This file is part of GNU Emacs.
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12 ;;;
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13 ;;; GNU Emacs is free software; you can redistribute it and/or modify
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14 ;;; it under the terms of the GNU General Public License as published by
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15 ;;; the Free Software Foundation; either version 2, or (at your option)
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16 ;;; any later version.
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17 ;;;
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18 ;;; GNU Emacs is distributed in the hope that it will be useful,
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19 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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20 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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21 ;;; GNU General Public License for more details.
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22 ;;;
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23 ;;; You should have received a copy of the GNU General Public License
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24 ;;; along with GNU Emacs; see the file COPYING. If not, write to the
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25 ;;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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26 ;;; Boston, MA 02111-1307, USA.
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27 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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28
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29 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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30 ;;; This is a widget that will do the best it can with an image.
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31 ;;;
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32 ;;; It can handle all the common occurences of images on the world wide web
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33 ;;; 1. A plain image - displays either a glyph of the image, or the
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34 ;;; alternative text
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35 ;;; 2. A hyperlinked image - an image that is also a hypertext link to
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36 ;;; another page. Displays either a glyph of the image, or the
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37 ;;; alternative text. When activated with the mouse or the keyboard,
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38 ;;; the 'href' property of the widget is retrieved.
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39 ;;; 3. Server side imagemaps - an image that has hotzones that lead to
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40 ;;; different areas. Unfortunately, we cannot tell where the links go
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41 ;;; from the client - all processing is done by the server. Displays
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42 ;;; either a glyph of the image, or the alternative text. When activated
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43 ;;; with the mouse or the keyboard, the coordinates clicked on are
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44 ;;; sent to the remote server as HREF?x,y. If the link is activated
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45 ;;; by the keyboard, then 0,0 are sent as the coordinates.
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46 ;;; 4. Client side imagemaps - an image that has hotzones that lead to
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47 ;;; different areas. All processing is done on the client side, so
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48 ;;; we can actually show a decent representation on a TTY. Displays
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49 ;;; either a glyph of the image, or a drop-down-list of the destinations
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50 ;;; These are either URLs (http://foo/...) or alternative text.
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51 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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52
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53 (require 'cl)
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54 (require 'widget)
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55
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56 (defvar widget-image-keymap (make-sparse-keymap)
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57 "Keymap used over glyphs in an image widget")
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58
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110
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59 (define-widget-keywords :tab-order)
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60
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61 (defconst widget-mouse-button1 nil)
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62 (defconst widget-mouse-button2 nil)
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63 (defconst widget-mouse-button3 nil)
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64
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65 (if (string-match "XEmacs" (emacs-version))
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66 (if (featurep 'mouse)
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67 (setq widget-mouse-button1 'button1
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68 widget-mouse-button2 'button2
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69 widget-mouse-button3 'button3)
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70 (setq widget-mouse-button1 'return
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71 widget-mouse-button2 'return
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72 widget-mouse-button3 'return))
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73 (setq widget-mouse-button1 'mouse-1
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74 widget-mouse-button2 'mouse-2
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75 widget-mouse-button3 'mouse-3))
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76
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77 (defvar widget-image-inaudible-p nil
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78 "*Whether to make images inaudible or not.")
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79
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80
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80 (define-key widget-image-keymap (vector widget-mouse-button1)
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81 'widget-image-button-press)
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82 (define-key widget-image-keymap (vector widget-mouse-button2)
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83 'widget-image-button-press)
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84
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85 (define-widget 'image 'default
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86 "A fairly complex image widget."
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87 :convert-widget 'widget-image-convert
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88 :value-to-internal (lambda (widget value) value)
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89 :value-to-external (lambda (widget value) value)
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90 :value-set 'widget-image-value-set
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91 :create 'widget-image-create
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92 :delete 'widget-image-delete
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93 :value-create 'widget-image-value-create
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94 :value-delete 'widget-image-value-delete
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95 :value-get 'widget-image-value-get
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96 :notify 'widget-image-notify
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97 )
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98
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99 (defun widget-image-convert (widget)
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100 (let ((args (widget-get widget :args)))
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101 (widget-put widget :args nil)
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102 (while args
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103 (widget-put widget (car args) (cadr args))
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104 (setq args (cddr args)))
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105 widget))
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106
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107 (defun widget-image-value-get (widget)
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108 (let ((children (widget-get widget :children)))
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109 (and (car children)
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110 (widget-apply (car children) :value-get))))
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111
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112 (defun widget-image-create (widget)
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113 ;; Create an image widget at point in the current buffer
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114 (let ((where (widget-get widget 'where)))
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115 (cond
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116 ((null where)
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117 (setq where (set-marker (make-marker) (point))))
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118 ((markerp where)
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119 nil)
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120 ((integerp where)
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121 (setq where (set-marker (make-marker) where)))
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122 (t
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123 (error "IMPOSSIBLE position in widget-image-create: %s" where)))
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124 (widget-put widget 'where where))
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125 (widget-image-value-create widget))
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126
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127 (defun widget-image-value-set (widget value)
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128 ;; Recreate widget with new value.
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129 (save-excursion
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130 (widget-image-delete widget)
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131 (if (widget-glyphp value)
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132 (widget-put widget 'glyph value)
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133 (widget-put widget :value value))
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134 (put-text-property (point)
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135 (progn
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136 (widget-apply widget :create)
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137 (point))
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138 'inaudible
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139 widget-image-inaudible-p)))
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140
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141 (defsubst widget-image-usemap (widget)
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142 (let ((usemap (widget-get widget 'usemap)))
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143 (if (listp usemap)
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144 usemap
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145 (if (and usemap (string-match "^#" usemap))
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146 (setq usemap (substring usemap 1 nil)))
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147 (cdr-safe (assoc usemap w3-imagemaps)))))
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148
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149 (defun widget-image-callback (widget widget-ignore &optional event)
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150 (if (widget-get widget 'href)
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151 (w3-fetch (widget-get widget 'href) (widget-get widget 'target))))
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152
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153 (defmacro widget-image-create-subwidget (&rest args)
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154 (` (widget-create (,@ args)
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155 :parent widget
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156 :help-echo 'widget-image-summarize
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157 'usemap (widget-get widget 'usemap)
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158 'href href
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159 'src (widget-get widget 'src)
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160 'ismap server-map)))
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161
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162 (defun widget-image-value-create (widget)
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163 ;; Insert the printed representation of the value
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164 (let (
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165 (href (widget-get widget 'href))
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166 (server-map (widget-get widget 'ismap))
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167 (client-map (widget-image-usemap widget))
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168 (where (or (widget-get widget 'where) (point)))
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169 (glyph (widget-get widget 'glyph))
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170 (alt (widget-get widget 'alt))
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171 (real-widget nil)
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172 (invalid-glyph nil)
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173 )
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174
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175 ;; Specifier-instance will signal an error if we have an invalid
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176 ;; image specifier, which would be the case if we get screwed up
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177 ;; data back from a URL somewhere.
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178
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179 (setq invalid-glyph (and glyph (condition-case ()
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180 (if (specifier-instance
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181 (glyph-image glyph))
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182 nil)
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183 (error t))))
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184 (if (or (not glyph) invalid-glyph)
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185 ;; Do a TTY or delayed image version of the image.
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186 (save-excursion
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187 (if (= 0 (length alt)) (setq alt nil))
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188 (goto-char where)
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189 (cond
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190 (client-map
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191 (let* ((default nil)
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192 (options (mapcar
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193 (function
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194 (lambda (x)
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195 (if (eq (aref x 0) 'default)
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196 (setq default (aref x 2)))
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197 (if (and (not default) (stringp (aref x 2)))
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198 (setq default (aref x 2)))
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199 (list 'choice-item
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120
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200 :tab-order -1
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201 :format "%[%t%]"
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202 :tag (or (aref x 3) (aref x 2))
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203 :value (aref x 2)))) client-map)))
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204 (setq real-widget
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205 (apply 'widget-create 'menu-choice
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206 :tag (or (widget-get widget :tag) "Imagemap")
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207 :ignore-case t
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208 :notify (widget-get widget :notify)
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209 :action (widget-get widget :action)
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210 :value default
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211 :parent widget
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212 :help-echo 'widget-image-summarize
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213 options))))
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214 ((and server-map (stringp href))
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215 (setq real-widget
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216 (widget-image-create-subwidget
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116
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217 'item :format "%[%t%]"
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218 :tag alt
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219 :delete 'widget-default-delete
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220 :value href
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221 :action (widget-get widget :action)
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222 :notify (widget-get widget :notify))))
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223 (href
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224 (setq real-widget
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225 (widget-image-create-subwidget
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226 'item :format "%[%t%]"
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227 :tag (or alt "Image")
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228 :value href
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229 :delete 'widget-default-delete
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230 :action (widget-get widget :action)
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231 :notify 'widget-image-callback)))
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232 (alt
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2
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233 (setq real-widget
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234 (widget-image-create-subwidget
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116
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235 'item :format "%[%t%]"
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236 :tag alt
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237 :tab-order -1
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238 :delete 'widget-default-delete
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239 :action (widget-get widget :action)
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240 :notify 'widget-image-callback))))
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241 (if (not real-widget)
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242 nil
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243 (widget-put widget :children (list real-widget))))
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244 ;;; Actually use the image
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245 (let ((extent (or (widget-get widget 'extent)
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246 (make-extent where where))))
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247 (set-extent-endpoints extent where where)
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248 (widget-put widget 'extent extent)
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249 (widget-put widget :children nil)
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250 (set-extent-property extent 'keymap widget-image-keymap)
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251 (set-extent-property extent 'begin-glyph glyph)
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252 (set-extent-property extent 'detachable t)
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253 (set-extent-property extent 'help-echo (cond
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254 ((and href (or client-map
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255 server-map))
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256 (format "%s [map]" href))
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257 (href href)
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258 (t nil)))
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259 (set-glyph-property glyph 'widget widget)))))
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260
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261 (defun widget-image-delete (widget)
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262 ;; Remove the widget from the buffer
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263 (let ((extent (widget-get widget 'extent))
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264 (child (car (widget-get widget :children))))
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265 (cond
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266 (extent ; Remove a glyph
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267 (delete-extent extent))
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268 (child ; Remove a child widget
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269 (widget-apply child :delete))
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270 (t ; Doh! Do nothing.
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271 nil))))
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272
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273 (if (fboundp 'mouse-event-p)
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274 (fset 'widget-mouse-event-p 'mouse-event-p)
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275 (fset 'widget-mouse-event-p 'ignore))
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276
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277 (if (fboundp 'glyphp)
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278 (fset 'widget-glyphp 'glyphp)
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279 (fset 'widget-glyphp 'ignore))
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280
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281 (defun widget-image-button-press (event)
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282 (interactive "@e")
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283 (let* ((glyph (and event (widget-mouse-event-p event) (event-glyph event)))
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284 (widget (and glyph (glyph-property glyph 'widget))))
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285 (widget-image-notify widget widget event)))
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286
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287 (defun widget-image-usemap-default (usemap)
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288 (let ((rval (and usemap (car usemap))))
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289 (while usemap
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290 (if (equal (aref (car usemap) 0) "default")
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291 (setq rval (car usemap)
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292 usemap nil))
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293 (setq usemap (cdr usemap)))
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294 rval))
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295
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296 (defun widget-image-summarize (widget)
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297 (if (widget-get widget :parent)
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298 (setq widget (widget-get widget :parent)))
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299 (let* ((ismap (widget-get widget 'ismap))
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300 (usemap (widget-image-usemap widget))
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301 (href (widget-get widget 'href))
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302 (alt (widget-get widget 'alt))
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116
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303 (value (widget-value widget)))
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304 (cond
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305 (usemap
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306 (setq usemap (widget-image-usemap-default usemap))
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307 ;; Perhaps we should do something here with showing the # of entries
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308 ;; in the imagemap as well as the default href? Could get too long.
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309 (format "Client side imagemap: %s" value))
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310 (ismap
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311 (format "Server side imagemap: %s" href))
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312 ((stringp href) ; Normal hyperlink
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313 (format "Image hyperlink: %s" href))
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314 ((stringp alt) ; Alternate message was specified
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315 (format "Image: %s" alt))
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316 ((stringp value)
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317 (format "Image: %s" value))
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318 (t ; Huh?
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319 "A very confused image widget."))))
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320
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82
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321 (defvar widget-image-auto-retrieve 'ask
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322 "*Whether to automatically retrieve the source of an image widget
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323 if it is not an active hyperlink or imagemap.
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324 If `nil', don't do anything.
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325 If `t', automatically retrieve the source.
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326 Any other value means ask the user each time.")
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327
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328 (defun widget-image-notify (widget widget-changed &optional event)
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0
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329 ;; Happens when anything changes
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80
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330 (let* ((glyph (and event (widget-mouse-event-p event) (event-glyph event)))
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331 (x (and glyph (event-glyph-x-pixel event)))
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332 (y (and glyph (event-glyph-y-pixel event)))
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333 (ismap (widget-get widget 'ismap))
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334 (usemap (widget-image-usemap widget))
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335 (href (widget-get widget 'href))
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82
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336 (img-src (or (widget-get widget 'src)
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337 (and widget-changed (widget-get widget-changed 'src))))
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108
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338 (target (widget-get widget 'target))
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339 )
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340 (cond
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341 ((and glyph usemap) ; Do the client-side imagemap stuff
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342 (setq href (w3-point-in-map (vector x y) usemap nil))
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82
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343 (if (stringp href)
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108
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344 (w3-fetch href target)
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345 (message "No destination found for %d,%d" x y)))
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346 ((and glyph x y ismap) ; Do the server-side imagemap stuff
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108
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347 (w3-fetch (format "%s?%d,%d" href x y) target))
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0
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348 (usemap ; Dummed-down tty client side imap
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82
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349 (let ((choices (mapcar (function
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350 (lambda (entry)
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351 (cons
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352 (or (aref entry 3) (aref entry 2))
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353 (aref entry 2)))) usemap))
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116
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354 (choice nil)
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355 (case-fold-search t))
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356 (setq choice (completing-read "Imagemap: " choices nil t)
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357 choice (cdr-safe (assoc choice choices)))
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108
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358 (and (stringp choice) (w3-fetch choice target))))
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0
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359 (ismap ; Do server-side dummy imagemap for tty
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108
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360 (w3-fetch (concat href "?0,0") target))
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0
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361 ((stringp href) ; Normal hyperlink
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108
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362 (w3-fetch href target))
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82
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363 ((stringp img-src)
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364 (cond
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365 ((null widget-image-auto-retrieve) nil)
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366 ((eq t widget-image-auto-retrieve)
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367 (w3-fetch img-src))
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368 ((funcall url-confirmation-func
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369 (format "Retrieve image (%s)?"
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370 (url-truncate-url-for-viewing img-src)))
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371 (w3-fetch img-src))))
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0
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372 (t ; Huh?
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373 nil))))
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374
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375 (provide 'w3-widget)
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