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/* $Id: window.pl,v 1.4 2002/02/01 15:04:51 jan Exp $
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): 1985-2002, University of Amsterdam
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
As a special exception, if you link this library with other files,
compiled with a Free Software compiler, to produce an executable, this
library does not by itself cause the resulting executable to be covered
by the GNU General Public License. This exception does not however
invalidate any other reasons why the executable file might be covered by
the GNU General Public License.
*/
:- 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
; concat_atom([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.
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