stk/Lib/www-browser.stklos

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;;;;
;;;; w w w - b r o w s e r . s t k l o s -- A simple WEB browser
;;;;
;;;; Copyright © 1993-1998 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
;;;;
;;;; Permission to use, copy, and/or distribute this software and its
;;;; documentation for any purpose and without fee is hereby granted, provided
;;;; that both the above copyright notice and this permission notice appear in
;;;; all copies and derived works. Fees for distribution or use of this
;;;; software or derived works may only be charged with express written
;;;; permission of the copyright holder.
;;;; This software is provided ``as is'' without express or implied warranty.
;;;;
;;;; Author: Erick Gallesio [eg@unice.fr]
;;;; Creation date: 21-Oct-1996 14:02
;;;; Last file update: 2-Mar-1998 10:47
;;;;
(require "Tk-classes")
(require "www")
(import WWW)
(define WWW:browser
(let ((browser #f)) ;; Id of browser (#f if no browser exists)
(lambda args
;; URL history management
;;
(define new-url
(let ((history '())
(current -1))
(lambda (txt url)
(case url
((previous) (when (> (length history) 1)
(set! current (modulo (- current 1) (length history)))
(www:view-url (Id txt) (list-ref history current))))
((next) (when (> (length history) 1)
(set! current (modulo (+ current 1) (length history)))
(www:view-url (Id txt) (list-ref history current))))
((reload) (www:view-url (Id txt) (list-ref history current)))
(ELSE (if (null? history)
(begin
(set! history (list url))
(set! current 0))
(unless (string=? (list-ref history current) url)
(set! history (append history (list url)))
(set! current (- (length history) 1)))))))))
;;; Make interface
;;;
(define (make-buttons parent txt)
(let* ((f (make <Frame> :parent parent))
(back (make <Button> :parent f :text "Back"
:command (lambda () (new-url txt 'previous))))
(forw (make <Button> :parent f :text "Forward"
:command (lambda () (new-url txt 'next))))
(reload (make <Button> :parent f :text "Reload"
:command (lambda () (new-url txt 'reload))))
(stop (make <Button> :parent f :foreground "Red" :text "Stop"
:command (lambda () (set! www:stop-loading #t))))
(exit (make <Button> :parent f :foreground "Blue2" :text "Exit"
:command (lambda () (destroy parent))))
(help (make <Button> :parent f :text "Help"
:command (lambda () (STk:show-help-file "STk-hlp.html")))))
(pack stop back forw reload exit :side "left")
(pack help :side "right")
f))
(define (make-interface parent)
(let* ((loc (make <Labeled-entry> :parent parent :title "Location:"
:font "fixed"))
(txt (make <Scroll-text> :parent parent :font "fixed"
:width 100 :height 45))
(f (make-buttons parent (Id txt)))
(f1 (make <Frame> :parent parent))
(lab (make <Label> :parent f1 :anchor "w"))
(gauge (make <Gauge> :parent f1 :width 200 :height 10
:background "Dark Gray" :foreground "IndianRed4")))
;;
;; Pack commponents
(pack f loc :expand #f :fill "x")
(pack txt :expand #t :fill "both")
(pack f1 :expand #f :fill "x")
(pack lab :expand #t :fill "x" :side "left")
(pack gauge :expand #f :side "left" :padx 10)
(bind (Id loc) "<Return>" (lambda () (www:view-url (Id txt) (value loc))))
;; Redefinition of WWW hooks
;;
(set! www:hook-formatting
(let ((counter 0)
(pos 0))
(lambda ()
(when (= counter 20)
(set! pos (modulo (+ pos 5) 105))
(set! counter 0)
(set! (value gauge) pos)
(update))
(set! counter (+ counter 1)))))
(set! www:hook-start-loading
(lambda ()
(slot-set! txt 'cursor "watch")
(slot-set! lab 'text "Loading Document ...")
(update)))
(set! www:hook-stop-loading
(lambda ()
(let ((msg "Loading Document ... Done."))
(slot-set! gauge 'value 0)
(slot-set! lab 'text msg)
(slot-set! txt 'cursor "top_left_arrow")
(set! www:stop-loading #f)
(after 5000 (lambda ()
(catch (if (equal? (slot-ref lab 'text) msg)
(slot-set! lab 'text ""))))))))
(set! www:hook-title
(lambda (value)
(slot-set! parent 'title value)))
(set! www:hook-location
(lambda (url)
(set! (value loc) url)
(new-url txt url)))
;; Return the txt widget
txt))
;;;;
;;;; STk:browse starts here
;;;;
(let* ((url (get-keyword :url args #f))
(parent (get-keyword :parent args #f)))
(unless browser
(set! browser (make-interface
(or parent
(make <Toplevel> :title "Stk Web browser"))))
(bind browser "<Destroy>" (lambda () (set! browser #f))))
(when url
(www:view-url (Id browser) url))
browser))))
;;;
;;; Misc.
;;;
(define STk:web-browser WWW:browser) ; for backward compatibility with 3.x versions
(provide "www-browser")