/*  $Id$

    Part of XPCE --- The SWI-Prolog GUI toolkit

    Author:        Jan Wielemaker and Anjo Anjewierden
    E-mail:        J.Wielemaker@vu.nl.nl
    WWW:           http://www.swi-prolog.org/projects/xpce/
    Copyright (C): 1985-2011, University of Amsterdam
			      VU University 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  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(pce_demo,
	  [ pcedemo/0
	  ]).
:- use_module(library(pce)).
:- use_module(contrib(contrib)).
:- use_module(library(persistent_frame)).
:- require([ emacs/1
	   , forall/2
	   , member/2
	   , term_to_atom/2
	   ]).

:- multifile				% So this may be predefined, avoiding
	pcedemo/0.			% an undefined trap

/** <module> XPCE demo starter

This file defines a demo-starting tool.  The demo's themselves should be
in the library files 'demo/<demo-file>.pl'. At the end of this file is a
list of available demo's.
*/

pcedemo :-
	new(F, persistent_frame('XPCE Demo Programs')),
	send(F, append, new(B, browser(@default, size(60,10)))),
	send(B, confirm_done, @off),
	send(B, tab_stops, vector(150)),
	fill_browser(B),

	send(new(D, dialog), below, B),
	send(D, append, new(O, button(open, message(@prolog, open_demo, B)))),
	send(D, append, button(source, message(@prolog, view_source, B))),
	send(D, append, button(quit, message(D?frame, free))),
	send(D, default_button, open),

	send(B, open_message, message(O, execute)),
	send(B, style, title, style(font := font(helvetica, bold, 14))),

	send(B, open).


fill_browser(B) :-
	forall(demo(Name, Summary, _, _),
	       send(B, append, dict_item(Name,
					 string('%s	%s', Name, Summary)))),
	send(B, append,
	     dict_item('======Contributions====================',
		       style := title)),
	forall(contribution(Name, Summary, _Author, _, _),
	       send(B, append, dict_item(Name,
					 string('%s	%s', Name, Summary)))).


open_demo(Browser) :-
	get(Browser, selection, DictItem),
	(   (	DictItem == @nil
	    ;	get(DictItem, style, title)
	    )
	->  send(@display, inform, 'First select a demo')
	;   get(DictItem, key, Name),
	    (	(   demo(Name, Summary, File, Predicate)
		;   contribution(Name, Summary, _Author, File, Predicate)
		)
	    ->  (   send(@pce, report, progress, 'Loading demo %s ...', Summary),
		    use_module(File),
		    send(@pce, report, done)
		->  (   Predicate
		    ->  true
		    ;   send(@pce, inform, 'Failed to start %s demo', Name)
		    )
		;   send(@pce, inform, 'Can''t find demo sourcefile')
		)
	    ;   send(Browser, report, error, 'No such demo: %s', Name)
	    )
	).

view_source(Browser) :-
	get(Browser, selection, DictItem),
	(   DictItem == @nil
	->  send(@display, inform, 'First select a demo')
	;   get(DictItem, key, Name),
	    (	demo(Name, _, File, _)
	    ;	contribution(Name, _, _Author, File, _)
	    ),
	    (	locate_file(File, Path)
	    ->	emacs(Path)
	    ;	term_to_atom(File, FileAtom),
	        send(Browser, report, error,
		     'Can''t find source from %s', FileAtom)
	    )
	).

locate_file(Base, File) :-
	absolute_file_name(Base,
			   [ file_type(prolog),
			     access(read)
			   ], File).


		/********************************
		*             DEMO'S		*
		********************************/

demo('PceDraw',				% Name
     'Drawing tool',			% Summary
     library(pcedraw),			% Sources
     pcedraw).				% Toplevel predicate

demo('Ispell',
     'Graphical interface to ispell (requires ispell 3)',
     demo(ispell),
     ispell) :-
	send(@pce, has_feature, process).

demo('Emacs',
     'Emacs (Epoch) look-alike editor',
     library(pce_emacs),
     emacs).

demo('XMLView',
     'Browse structure of HTML/SGML and XML files',
     library('doc/xml_browse'),
     send(new(xml_browser), open)).

demo('FontViewer',
     'Examine PCE predefined fonts',
     demo(fontviewer),
     fontviewer).

demo('Cursors',
     'Displays browser of available cursors',
     demo(cursor),
     cursor_demo).

demo('Colours',
     'Displays browser of named colours',
     demo(colour),
     colour_browser).

demo('HSV Colours',
     'Colour browser using Hue-Saturnation-Value',
     demo(hsvcolour),
     hsv_browser).

demo('ImageViewer',
     'Examine image files in a directory',
     demo(imageviewer),
     image_viewer).

demo('Events',
     'Display hierarchy of event-types',
     demo(event_hierarchy),
     event_hierarchy).

demo('GraphViewer',
     'Visualise a graph represented as Prolog facts',
     demo(graph),
     graph_viewer).

demo('FtpLog',
     'Examine /usr/adm/xferlog (ftp log file)',
     demo(ftplog),
     ftplog('/usr/adm/xferlog')) :-
	send(@pce, has_feature, process),
	absolute_file_name('/usr/adm/xferlog', Path),
	send(file(Path), access, read).


demo('ChessTool',
     'Simple frontend for /usr/games/chess',
     demo(chess),
     chess) :-
	send(@pce, has_feature, process),
	absolute_file_name('/usr/games/chess', Path),
	send(file(Path), access, execute).

demo('Constraints',
     'Using constraints and relations',
     demo(constraint),
     constraint_demo).

demo('Kangaroo',
     'Jumping kangaroos demo',
     demo(kangaroo),
     kangaroo).

demo('Juggler',
     'Annimation of a juggling creature',
     demo(juggler),
     juggle_demo).

