/* Part of XPCE --- The SWI-Prolog GUI toolkit Author: Jan Wielemaker and Anjo Anjewierden E-mail: jan@swi.psy.uva.nl WWW: http://www.swi.psy.uva.nl/projects/xpce/ Copyright (c) 2000-2011, University of Amsterdam All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ :- module(doc_window, []). :- use_module(library(pce)). :- use_module(doc(html)). :- use_module(doc(url_fetch)). :- use_module(doc(util)). :- pce_begin_class(doc_window, picture, "Represent a document"). variable(url, name*, get, "Represented URL"). variable(location, name*, get, "Label last jumped too"). variable(backward_list, chain, get, "->back list of URL's"). variable(forward_list, chain, get, "->back list of URL's"). variable(page_source, file*, get, "(Cached) source-page"). class_variable(size, size, size(600, 300)). initialise(DW, URL:[name]*) :-> send_super(DW, initialise), send(DW, slot, forward_list, new(chain)), send(DW, slot, backward_list, new(chain)), send(DW, display, new(PB, pbox(550, justify)), point(25,0)), send(DW, resize_message, message(PB, line_width, @arg1?width-50)), send(DW, recogniser, @scroll_recogniser), ( atom(URL) -> send(DW, url, URL) ; true ). :- pce_global(@scroll_recogniser, make_scroll_recogniser). make_scroll_recogniser(G) :- new(G, key_binding), send_list(G, [ function('SPC', message(@event?receiver, scroll_vertical, forwards, page, 700)), function('\\ef', message(@event?receiver?window, find)), function(page_down, message(@receiver, scroll_vertical, forwards, page, 1000)), function(page_up, message(@receiver, scroll_vertical, backwards, page, 1000)), function(cursor_home, message(@receiver, scroll_vertical, goto, file, 0)), function(end, message(@receiver, scroll_vertical, goto, file, 1000)) ]). parbox(DW, PB:pbox) :<- "Get the parbox representing the whole document":: get(DW, member, pbox, PB). :- pce_group(navigate). goto_label(DW, Label:name) :-> "Goto named label in current document":: send(DW?decoration, compute), % so layout is fine get(DW, parbox, PB), ( get(PB, anchor, Label, tuple(PB2, Index)) % get(PB2, box, Index, OpenAnchor), % get(OpenAnchor, hypered, close, CloseAnchor) -> get(PB2, window, Window), get(PB2, box_area, Index, Window, Area), send(Window, scroll_to, point(0, Area?y-20)) ; send(DW, report, error, 'Label %s not found', Label) ). clear(DW) :-> "Remove current page":: get(DW, parbox, PB), send(PB, clear), send(PB, append, hbox(0, 10)), send(DW, scroll_to, point(0, 0)), send(DW, flush). show(DW, Tokens:prolog, Mode:[doc_mode]) :-> "Show parsed document":: send(DW, clear), get(DW, parbox, PB), send(PB, show, Tokens, Mode). url(DW, URLSpec:name*) :-> "Switch to indicated url":: ( URLSpec == @nil -> send(DW, slot, page_source, @nil), send(DW, clear), send(DW, slot, url, @nil) ; labeled_url(URLSpec, URL, Label), get(DW, frame, Frame), catch(send(Frame, add_history, URL), _, true), ( get(DW, url, URL) -> true ; send(Frame, busy_cursor), get_url_to_file(URL, Path), send(DW, slot, page_source, Path), send(DW, clear), send(Frame, label, URL), % Dubious send(DW, slot, url, URL), get(DW, parbox, PB), load_html_file(Path, Tokens), new(Mode, doc_mode), send(Mode, base_url, URL), send(PB, show, Tokens, Mode), send(Frame, busy_cursor, @nil) ), ( Label \== '' -> send(DW, goto_label, Label) ; true ) ). goto_url(DW, URLSpec:name, Dir:[{forward,backward}]) :-> "Switch to label or URL with label":: debug(browser, 'Request for URL \'~w\'~n', [URLSpec]), send(DW, push_location, Dir), labeled_url(URLSpec, URL, Label), ( URL \== '' -> get(DW, url, Base), global_url(URL, Base, GlobalURL), send(DW, url, GlobalURL) ; true ), ( Label \== '' -> send(DW, goto_label, Label) ; true ). push_location(DW, Dir:[{forward,backward}]) :-> "Push current location on navigation list":: get(DW, url, URL), get(DW, location, Label), ( Label == @nil -> Full = URL ; atomic_list_concat([URL, #, Label], Full) ), ( Dir == backward -> send(DW?forward_list, prepend, Full) ; send(DW?backward_list, prepend, Full) ). backward(DW) :-> "Go to previous location":: get(DW, backward_list, L), get(L, delete_head, To), send(DW, goto_url, To, backward). forward(DW) :-> "Got the next location":: get(DW, forward_list, L), get(L, delete_head, To), send(DW, goto_url, To, forward). find(DW) :-> "Open find dialog":: new(D, dialog('Find in page')), send(D, append, new(TI, text_item(search_for))), send(D, append, button(cancel, message(D, destroy))), send(D, append, button(find, message(DW, do_find, TI?selection))), send(D, default_button, find), get(DW, frame, Frame), send(D, transient_for, Frame), send(D, open_centered, Frame?area?center). do_find(DW, Text:name) :-> "Find named text and jump to it":: get(DW, parbox, PB), ( get(PB, find, and(message(@arg1, instance_of, tbox), @arg1?text == Text), tuple(PB2, Index)) -> get(PB2, window, Window), get(PB2, box_area, Index, Window, Area), send(Window, normalise, Area), object(Area, area(X, Y, W, H)), send(Window, display, box(W,H), point(X, Y)) ; send(DW, report, error, 'Not found') ). labeled_url(Spec, URL, Label) :- sub_atom(Spec, B, _, A, #), !, sub_atom(Spec, 0, B, _, URL), sub_atom(Spec, _, A, 0, Label). labeled_url(Spec, Spec, ''). :- pce_end_class.