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1 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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2 ;;; w3-widget.el,v --- An image widget
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3 ;; Author: wmperry
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4 ;; Created: 1996/05/29 03:11:24
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5 ;; Version: 1.14
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6 ;; Keywords: faces, help, comm, news, mail, processes, mouse, hypermedia
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7
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8 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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9 ;;; Copyright (c) 1993, 1994, 1995 by William M. Perry (wmperry@spry.com)
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10 ;;;
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11 ;;; This file is not part of GNU Emacs, but the same permissions apply.
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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
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25 ;;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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26 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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27
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28 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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29 ;;; This is a widget that will do the best it can with an image.
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30 ;;;
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31 ;;; It can handle all the common occurences of images on the world wide web
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32 ;;; 1. A plain image - displays either a glyph of the image, or the
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33 ;;; alternative text
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34 ;;; 2. A hyperlinked image - an image that is also a hypertext link to
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35 ;;; another page. Displays either a glyph of the image, or the
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36 ;;; alternative text. When activated with the mouse or the keyboard,
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37 ;;; the 'href' property of the widget is retrieved.
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38 ;;; 3. Server side imagemaps - an image that has hotzones that lead to
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39 ;;; different areas. Unfortunately, we cannot tell where the links go
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40 ;;; from the client - all processing is done by the server. Displays
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41 ;;; either a glyph of the image, or the alternative text. When activated
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42 ;;; with the mouse or the keyboard, the coordinates clicked on are
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43 ;;; sent to the remote server as HREF?x,y. If the link is activated
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44 ;;; by the keyboard, then 0,0 are sent as the coordinates.
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45 ;;; 4. Client side imagemaps - an image that has hotzones that lead to
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46 ;;; different areas. All processing is done on the client side, so
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47 ;;; we can actually show a decent representation on a TTY. Displays
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48 ;;; either a glyph of the image, or a drop-down-list of the destinations
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49 ;;; These are either URLs (http://foo/...) or alternative text.
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50 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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51
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52 (require 'cl)
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53 (require 'widget)
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54 (require 'w3-vars)
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55 (require 'w3-mouse)
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56
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57 (defvar w3-image-widget-keymap (make-sparse-keymap)
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58 "Keymap used over glyphs in an image widget")
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59
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60 (define-key w3-image-widget-keymap (vector w3-mouse-button1)
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61 'w3-image-widget-button-press)
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62 (define-key w3-image-widget-keymap (vector w3-mouse-button2)
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63 'w3-image-widget-button-press)
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64
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65 (define-widget 'image 'default
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66 "A fairly complex image widget."
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67 :convert-widget 'w3-image-widget-convert
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68 :value-to-internal (lambda (widget value) value)
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69 :value-to-external (lambda (widget value) value)
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70 :value-set 'w3-image-widget-value-set
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71 :create 'w3-image-widget-create
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72 :delete 'w3-image-widget-delete
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73 :value-create 'w3-image-widget-value-create
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74 :value-delete 'w3-image-widget-value-delete
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75 :value-get 'w3-image-widget-value-get
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76 :notify 'w3-image-widget-notify
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77 )
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78
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79 (defun w3-image-widget-convert (widget)
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80 (let ((args (widget-get widget :args)))
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81 (widget-put widget :args nil)
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82 (while args
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83 (widget-put widget (car args) (cadr args))
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84 (setq args (cddr args)))
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85 widget))
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86
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87 (defun w3-image-widget-value-get (widget)
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88 (let ((children (widget-get widget :children)))
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89 (and (car children)
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90 (widget-apply (car children) :value-get))))
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91
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92 (defun w3-image-widget-create (widget)
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93 ;; Create an image widget at point in the current buffer
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94 (let ((where (widget-get widget 'where)))
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95 (cond
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96 ((null where)
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97 (setq where (set-marker (make-marker) (point))))
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98 ((markerp where)
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99 nil)
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100 ((integerp where)
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101 (setq where (set-marker (make-marker) where)))
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102 (t
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103 (error "IMPOSSIBLE position in w3-image-widget-create: %s" where)))
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104 (widget-put widget 'where where))
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105 (w3-image-widget-value-create widget))
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106
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107 (defun w3-image-widget-value-set (widget value)
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108 ;; Recreate widget with new value.
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109 (save-excursion
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110 (w3-image-widget-delete widget)
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111 (if (w3-glyphp value)
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112 (widget-put widget 'glyph value)
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113 (widget-put widget :value value))
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114 (widget-apply widget :create)))
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115
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116 (defsubst w3-image-widget-usemap (widget)
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117 (let ((usemap (widget-get widget 'usemap)))
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118 (if (listp usemap)
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119 usemap
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120 (if (and usemap (string-match "^#" usemap))
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121 (setq usemap (substring usemap 1 nil)))
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122 (cdr-safe (assoc usemap w3-imagemaps)))))
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123
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124 (defun w3-image-widget-callback (widget widget-ignore &optional event)
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125 (and (widget-get widget 'href) (w3-fetch (widget-get widget 'href))))
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126
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127 (defun w3-image-widget-value-create (widget)
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128 ;; Insert the printed representation of the value
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129 (let (
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130 (href (widget-get widget 'href))
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131 (server-map (widget-get widget 'ismap))
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132 (client-map (w3-image-widget-usemap widget))
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133 (where (or (widget-get widget 'where) (point)))
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134 (glyph (widget-get widget 'glyph))
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135 (alt (widget-get widget 'alt))
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136 (real-widget nil)
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137 (invalid-glyph nil)
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138 )
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139
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140 ;; Specifier-instance will signal an error if we have an invalid
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141 ;; image specifier, which would be the case if we get screwed up
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142 ;; data back from a URL somewhere.
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143
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144 (setq invalid-glyph (and glyph (condition-case ()
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145 (if (specifier-instance
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146 (glyph-image glyph))
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147 nil)
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148 (error t))))
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149 (if (or (not glyph) invalid-glyph)
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150 ;; Do a TTY or delayed image version of the image.
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151 (save-excursion
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152 (if (= 0 (length alt)) (setq alt nil))
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153 (goto-char where)
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154 (cond
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155 (client-map
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156 (let* ((default nil)
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157 (options (mapcar
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158 (function
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159 (lambda (x)
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160 (if (eq (aref x 0) 'default)
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161 (setq default (aref x 2)))
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162 (if (and (not default) (stringp (aref x 2)))
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163 (setq default (aref x 2)))
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164 (list 'choice-item
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165 :format "%[%t%]"
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166 :tag (or (aref x 3) (aref x 2))
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167 :value (aref x 2)))) client-map)))
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168 (setq real-widget
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169 (apply 'widget-create 'choice
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170 :tag (or (widget-get widget :tag) "Imagemap")
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171 :notify (widget-get widget :notify)
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172 :value default options))))
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173 ((and server-map (stringp href))
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174 (setq real-widget
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175 (widget-create 'push :tag alt
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176 :delete 'widget-default-delete
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177 :value href
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178 :notify (widget-get widget :notify))))
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179 (href
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180 (setq real-widget
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181 (widget-create 'push :tag (or alt "Image")
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182 :value href
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183 :delete 'widget-default-delete
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184 :notify 'w3-image-widget-callback)))
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185 (alt
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186 (setq real-widget (widget-create 'item :format "%v" :value alt))))
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187 (if (not real-widget)
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188 nil
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189 (widget-put real-widget 'usemap (widget-get widget 'usemap))
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190 (widget-put real-widget 'href href)
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191 (widget-put real-widget 'ismap server-map)
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192 (widget-put real-widget :parent widget)
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193 (widget-put widget :children (list real-widget))))
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194 ;;; Actually use the image
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195 (let ((extent (or (widget-get widget 'extent)
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196 (make-extent where where))))
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197 (set-extent-endpoints extent where where)
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198 (widget-put widget 'extent extent)
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199 (widget-put widget :children nil)
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200 (set-extent-property extent 'keymap w3-image-widget-keymap)
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201 (set-extent-property extent 'begin-glyph glyph)
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202 (set-extent-property extent 'help-echo (cond
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203 ((and href (or client-map
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204 server-map))
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205 (format "%s [map]" href))
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206 (href href)
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207 (t nil)))
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208 (set-glyph-property glyph 'widget widget)))))
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209
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210 (defun w3-image-widget-delete (widget)
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211 ;; Remove the widget from the buffer
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212 (let ((extent (widget-get widget 'extent))
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213 (child (car (widget-get widget :children))))
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214 (cond
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215 (extent ; Remove a glyph
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216 (delete-extent extent))
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217 (child ; Remove a child widget
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218 (widget-apply child :delete))
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219 (t ; Doh! Do nothing.
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220 nil))))
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221
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222 (if (fboundp 'mouse-event-p)
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223 (fset 'w3-mouse-event-p 'mouse-event-p)
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224 (fset 'w3-mouse-event-p 'ignore))
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225
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226 (if (fboundp 'glyphp)
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227 (fset 'w3-glyphp 'glyphp)
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228 (fset 'w3-glyphp 'ignore))
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229
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230 (defun w3-image-widget-button-press (event)
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231 (interactive "@e")
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232 (let* ((glyph (and event (w3-mouse-event-p event) (event-glyph event)))
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233 (widget (and glyph (glyph-property glyph 'widget))))
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234 (w3-image-widget-notify widget widget event)))
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235
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236 (defun w3-image-widget-notify (widget widget-changed &optional event)
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237 ;; Happens when anything changes
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238 (let* ((glyph (and event (w3-mouse-event-p event) (event-glyph event)))
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239 (x (and glyph (event-glyph-x-pixel event)))
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240 (y (and glyph (event-glyph-y-pixel event)))
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241 (ismap (widget-get widget 'ismap))
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242 (usemap (w3-image-widget-usemap widget))
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243 (href (widget-get widget 'href))
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244 (value (widget-value widget))
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245 )
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246 (cond
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247 ((and glyph usemap) ; Do the client-side imagemap stuff
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248 (setq href (w3-point-in-map (vector x y) usemap nil))
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249 (if href
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250 (w3-fetch href)
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251 (message "No destination found for %d,%d" x y)))
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252 ((and glyph x y ismap) ; Do the server-side imagemap stuff
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253 (w3-fetch (format "%s?%d,%d" href x y)))
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254 (usemap ; Dummed-down tty client side imap
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255 (w3-fetch value))
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256 (ismap ; Do server-side dummy imagemap for tty
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257 (w3-fetch (concat href "?0,0")))
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258 ((stringp href) ; Normal hyperlink
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259 (w3-fetch href))
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260 (t ; Huh?
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261 nil))))
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262
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263 (provide 'w3-widget)
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