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1 ;;; w3-widget.el --- An image widget
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2 ;; Author: wmperry
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3 ;; Created: 1997/01/17 22:09:43
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4 ;; Version: 1.16
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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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59 (defconst widget-mouse-button1 nil)
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60 (defconst widget-mouse-button2 nil)
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61 (defconst widget-mouse-button3 nil)
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62
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63 (if (string-match "XEmacs" (emacs-version))
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64 (if (featurep 'mouse)
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65 (setq widget-mouse-button1 'button1
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66 widget-mouse-button2 'button2
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67 widget-mouse-button3 'button3)
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68 (setq widget-mouse-button1 'return
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69 widget-mouse-button2 'return
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70 widget-mouse-button3 'return))
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71 (setq widget-mouse-button1 'mouse-1
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72 widget-mouse-button2 'mouse-2
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73 widget-mouse-button3 'mouse-3))
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74
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75 (define-key widget-image-keymap (vector widget-mouse-button1)
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76 'widget-image-button-press)
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77 (define-key widget-image-keymap (vector widget-mouse-button2)
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78 'widget-image-button-press)
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79
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80 (define-widget 'image 'default
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81 "A fairly complex image widget."
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82 :convert-widget 'widget-image-convert
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83 :value-to-internal (lambda (widget value) value)
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84 :value-to-external (lambda (widget value) value)
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85 :value-set 'widget-image-value-set
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86 :create 'widget-image-create
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87 :delete 'widget-image-delete
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88 :value-create 'widget-image-value-create
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89 :value-delete 'widget-image-value-delete
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90 :value-get 'widget-image-value-get
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91 :notify 'widget-image-notify
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92 )
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93
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94 (defun widget-image-convert (widget)
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95 (let ((args (widget-get widget :args)))
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96 (widget-put widget :args nil)
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97 (while args
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98 (widget-put widget (car args) (cadr args))
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99 (setq args (cddr args)))
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100 widget))
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101
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102 (defun widget-image-value-get (widget)
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103 (let ((children (widget-get widget :children)))
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104 (and (car children)
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105 (widget-apply (car children) :value-get))))
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106
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107 (defun widget-image-create (widget)
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108 ;; Create an image widget at point in the current buffer
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109 (let ((where (widget-get widget 'where)))
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110 (cond
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111 ((null where)
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112 (setq where (set-marker (make-marker) (point))))
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113 ((markerp where)
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114 nil)
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115 ((integerp where)
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116 (setq where (set-marker (make-marker) where)))
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117 (t
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118 (error "IMPOSSIBLE position in widget-image-create: %s" where)))
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119 (widget-put widget 'where where))
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120 (widget-image-value-create widget))
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121
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122 (defun widget-image-value-set (widget value)
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123 ;; Recreate widget with new value.
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124 (save-excursion
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125 (widget-image-delete widget)
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126 (if (widget-glyphp value)
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127 (widget-put widget 'glyph value)
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128 (widget-put widget :value value))
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129 (widget-apply widget :create)))
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130
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131 (defsubst widget-image-usemap (widget)
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132 (let ((usemap (widget-get widget 'usemap)))
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133 (if (listp usemap)
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134 usemap
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135 (if (and usemap (string-match "^#" usemap))
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136 (setq usemap (substring usemap 1 nil)))
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137 (cdr-safe (assoc usemap w3-imagemaps)))))
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138
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139 (defun widget-image-callback (widget widget-ignore &optional event)
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140 (and (widget-get widget 'href) (w3-fetch (widget-get widget 'href))))
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141
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142 (defmacro widget-image-create-subwidget (&rest args)
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143 (` (widget-create (,@ args)
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144 :parent widget
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145 :help-echo 'widget-image-summarize
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146 'usemap (widget-get widget 'usemap)
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147 'href href
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148 'src (widget-get widget 'src)
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149 'ismap server-map)))
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150
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151 (defun widget-image-value-create (widget)
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152 ;; Insert the printed representation of the value
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153 (let (
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154 (href (widget-get widget 'href))
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155 (server-map (widget-get widget 'ismap))
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156 (client-map (widget-image-usemap widget))
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157 (where (or (widget-get widget 'where) (point)))
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158 (glyph (widget-get widget 'glyph))
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159 (alt (widget-get widget 'alt))
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160 (real-widget nil)
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161 (invalid-glyph nil)
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162 )
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163
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164 ;; Specifier-instance will signal an error if we have an invalid
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165 ;; image specifier, which would be the case if we get screwed up
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166 ;; data back from a URL somewhere.
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167
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168 (setq invalid-glyph (and glyph (condition-case ()
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169 (if (specifier-instance
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170 (glyph-image glyph))
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171 nil)
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172 (error t))))
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173 (if (or (not glyph) invalid-glyph)
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174 ;; Do a TTY or delayed image version of the image.
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175 (save-excursion
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176 (if (= 0 (length alt)) (setq alt nil))
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177 (goto-char where)
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178 (cond
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179 (client-map
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180 (let* ((default nil)
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181 (options (mapcar
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182 (function
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183 (lambda (x)
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184 (if (eq (aref x 0) 'default)
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185 (setq default (aref x 2)))
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186 (if (and (not default) (stringp (aref x 2)))
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187 (setq default (aref x 2)))
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188 (list 'choice-item
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189 :format "%[%t%]"
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190 :tag (or (aref x 3) (aref x 2))
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191 :value (aref x 2)))) client-map)))
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192 (setq real-widget
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193 (apply 'widget-create 'menu-choice
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194 :tag (or (widget-get widget :tag) "Imagemap")
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195 :notify (widget-get widget :notify)
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196 :action (widget-get widget :action)
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197 :value default
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198 :parent widget
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199 :help-echo 'widget-image-summarize
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200 options))))
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201 ((and server-map (stringp href))
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202 (setq real-widget
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203 (widget-image-create-subwidget
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204 'push-button :tag alt
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205 :delete 'widget-default-delete
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206 :value href
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207 :action (widget-get widget :action)
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208 :notify (widget-get widget :notify))))
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209 (href
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210 (setq real-widget
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211 (widget-image-create-subwidget
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212 'push-button :tag (or alt "Image")
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213 :value href
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214 :delete 'widget-default-delete
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215 :action (widget-get widget :action)
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216 :notify 'widget-image-callback)))
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217 (alt
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218 (setq real-widget
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219 (widget-image-create-subwidget
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220 'push-button :tag alt :format "%[%t%]"
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221 :delete 'widget-default-delete
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222 :action (widget-get widget :action)
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223 :notify 'widget-image-callback))))
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224 (if (not real-widget)
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225 nil
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226 (widget-put widget :children (list real-widget))))
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227 ;;; Actually use the image
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228 (let ((extent (or (widget-get widget 'extent)
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229 (make-extent where where))))
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230 (set-extent-endpoints extent where where)
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231 (widget-put widget 'extent extent)
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232 (widget-put widget :children nil)
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233 (set-extent-property extent 'keymap widget-image-keymap)
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234 (set-extent-property extent 'begin-glyph glyph)
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235 (set-extent-property extent 'help-echo (cond
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236 ((and href (or client-map
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237 server-map))
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238 (format "%s [map]" href))
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239 (href href)
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240 (t nil)))
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241 (set-glyph-property glyph 'widget widget)))))
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242
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243 (defun widget-image-delete (widget)
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244 ;; Remove the widget from the buffer
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245 (let ((extent (widget-get widget 'extent))
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246 (child (car (widget-get widget :children))))
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247 (cond
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248 (extent ; Remove a glyph
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249 (delete-extent extent))
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250 (child ; Remove a child widget
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251 (widget-apply child :delete))
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252 (t ; Doh! Do nothing.
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253 nil))))
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254
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255 (if (fboundp 'mouse-event-p)
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256 (fset 'widget-mouse-event-p 'mouse-event-p)
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257 (fset 'widget-mouse-event-p 'ignore))
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258
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259 (if (fboundp 'glyphp)
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260 (fset 'widget-glyphp 'glyphp)
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261 (fset 'widget-glyphp 'ignore))
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262
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263 (defun widget-image-button-press (event)
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264 (interactive "@e")
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265 (let* ((glyph (and event (widget-mouse-event-p event) (event-glyph event)))
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266 (widget (and glyph (glyph-property glyph 'widget))))
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267 (widget-image-notify widget widget event)))
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268
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269 (defun widget-image-usemap-default (usemap)
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270 (let ((rval (and usemap (car usemap))))
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271 (while usemap
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272 (if (equal (aref (car usemap) 0) "default")
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273 (setq rval (car usemap)
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274 usemap nil))
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275 (setq usemap (cdr usemap)))
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276 rval))
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277
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278 (defun widget-image-summarize (widget)
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279 (if (widget-get widget :parent)
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280 (setq widget (widget-get widget :parent)))
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281 (let* ((ismap (widget-get widget 'ismap))
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282 (usemap (widget-image-usemap widget))
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283 (href (widget-get widget 'href))
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284 (alt (widget-get widget 'alt))
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285 (value (widget-value widget))
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286 (i nil))
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287 (cond
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288 (usemap
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289 (setq i (length usemap)
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290 usemap (widget-image-usemap-default usemap))
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291 ;; Perhaps we should do something here with showing the # of entries
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292 ;; in the imagemap as well as the default href? Could get too long.
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293 (format "Client side imagemap: %s" value))
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294 (ismap
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295 (format "Server side imagemap: %s" href))
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296 ((stringp href) ; Normal hyperlink
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297 (format "Image hyperlink: %s" href))
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298 ((stringp alt) ; Alternate message was specified
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299 (format "Image: %s" alt))
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300 ((stringp value)
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301 (format "Image: %s" value))
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302 (t ; Huh?
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303 "A very confused image widget."))))
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304
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82
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305 (defvar widget-image-auto-retrieve 'ask
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306 "*Whether to automatically retrieve the source of an image widget
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307 if it is not an active hyperlink or imagemap.
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308 If `nil', don't do anything.
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309 If `t', automatically retrieve the source.
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310 Any other value means ask the user each time.")
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311
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312 (defun widget-image-notify (widget widget-changed &optional event)
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313 ;; Happens when anything changes
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314 (let* ((glyph (and event (widget-mouse-event-p event) (event-glyph event)))
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315 (x (and glyph (event-glyph-x-pixel event)))
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316 (y (and glyph (event-glyph-y-pixel event)))
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317 (ismap (widget-get widget 'ismap))
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318 (usemap (widget-image-usemap widget))
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319 (href (widget-get widget 'href))
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320 (img-src (or (widget-get widget 'src)
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321 (and widget-changed (widget-get widget-changed 'src))))
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322 (value (widget-value widget))
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323 )
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324 (cond
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325 ((and glyph usemap) ; Do the client-side imagemap stuff
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326 (setq href (w3-point-in-map (vector x y) usemap nil))
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327 (if (stringp href)
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328 (w3-fetch href)
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329 (message "No destination found for %d,%d" x y)))
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330 ((and glyph x y ismap) ; Do the server-side imagemap stuff
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331 (w3-fetch (format "%s?%d,%d" href x y)))
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332 (usemap ; Dummed-down tty client side imap
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333 (let ((choices (mapcar (function
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334 (lambda (entry)
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335 (cons
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336 (or (aref entry 3) (aref entry 2))
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337 (aref entry 3)))) usemap))
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338 (choice nil))
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339 (setq choice (completing-read "Imagemap: " choices nil t))
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340 (and (stringp choice) (w3-fetch choice))))
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341 (ismap ; Do server-side dummy imagemap for tty
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342 (w3-fetch (concat href "?0,0")))
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343 ((stringp href) ; Normal hyperlink
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344 (w3-fetch href))
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345 ((stringp img-src)
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346 (cond
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347 ((null widget-image-auto-retrieve) nil)
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348 ((eq t widget-image-auto-retrieve)
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349 (w3-fetch img-src))
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350 ((funcall url-confirmation-func
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351 (format "Retrieve image (%s)?"
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352 (url-truncate-url-for-viewing img-src)))
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353 (w3-fetch img-src))))
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354 (t ; Huh?
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355 nil))))
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356
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357 (provide 'w3-widget)
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