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