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1.2 Programming Example

Here is the code to implement the user interface example (see section 1.1 User Interface).

(require 'widget)

  (require 'wid-edit))

(defvar widget-example-repeat)

(defun widget-example ()
  "Create the widgets from the Widget manual."
  (kill-buffer (get-buffer-create "*Widget Example*"))
  (switch-to-buffer (get-buffer-create "*Widget Example*"))
  (make-local-variable 'widget-example-repeat)
  (widget-insert "Here is some documentation.\n\n")
  (widget-create 'editable-field
		 :size 13
		 :format "Name: %v " ; Text after the field!
		 "My Name")
  (widget-create 'menu-choice
		 :tag "Choose"
		 :value "This"
		 :help-echo "Choose me, please!"
		 :notify (lambda (widget &rest ignore)
			   (message "%s is a good choice!"
				    (widget-value widget)))
		 '(item :tag "This option" :value "This")
		 '(choice-item "That option")
		 '(editable-field :menu-tag "No option" "Thus option"))
  (widget-create 'editable-field
		 :format "Address: %v"
		 "Some Place\nIn some City\nSome country.")
  (widget-insert "\nSee also ")
  (widget-create 'link
		 :notify (lambda (&rest ignore)
			   (widget-value-set widget-example-repeat
					     '("En" "To" "Tre"))
		 "other work")
    " for more information.\n\nNumbers: count to three below\n")
  (setq widget-example-repeat
        (widget-create 'editable-list
                       :entry-format "%i %d %v"
                       :notify (lambda (widget &rest ignore)
                                 (let ((old (widget-get widget
                                       (new (length (widget-value widget))))
                                   (unless (eq old new)
                                     (widget-put widget ':example-length new)
                                     (message "You can count to %d." new))))
                       :value '("One" "Eh, two?" "Five!")
                       '(editable-field :value "three")))
  (widget-insert "\n\nSelect multiple:\n\n")
  (widget-create 'checkbox t)
  (widget-insert " This\n")
  (widget-create 'checkbox nil)
  (widget-insert " That\n")
  (widget-create 'checkbox
                 :notify (lambda (&rest ignore) (message "Tickle"))
  (widget-insert " Thus\n\nSelect one:\n\n")
  (widget-create 'radio-button-choice
                 :value "One"
                 :notify (lambda (widget &rest ignore)
                           (message "You selected %s"
                                    (widget-value widget)))
                 '(item "One") '(item "Another One.") '(item "A Final One."))
  (widget-insert "\n")
  (widget-create 'push-button
		 :notify (lambda (&rest ignore)
			   (if (= (length (widget-value widget-example-repeat))
			       (message "Congratulation!")
			     (error "Three was the count!")))
		 "Apply Form")
  (widget-insert " ")
  (widget-create 'push-button
                 :notify (lambda (&rest ignore)
                 "Reset Form")
  (widget-insert "\n")
  (use-local-map widget-keymap)

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