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/* 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) 1996-2013, 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(pce_colour_browser,
[ colour_browser/0
]).
:- use_module(library(pce)).
:- require([ absolute_file_name/3
, send_list/3
]).
:- multifile
user:file_search_path/2.
:- dynamic
user:file_search_path/2.
user:file_search_path(x11, OpenWin) :-
get(@pce, environment_variable, 'OPENWINHOME', OpenWin).
user:file_search_path(x11, '/usr/lib/X11').
user:file_search_path(x11, '/usr/share/X11').
user:file_search_path(x11, PceLib) :-
get(@pce, window_system, windows),
get(@pce, home, PceHome),
atom_concat(PceHome, '/lib', PceLib).
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
This demo implements a browser for the X11 predefined colours. The
colour browser assumes the X11 colour database is located in
x11('lib/rgb.txt').
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
colour_browser :-
make_colour_browser(CB),
send(CB, open).
make_colour_browser(CB) :-
absolute_file_name(x11(rgb),
[ extensions([txt]),
access(read),
file_errors(fail)
], DataBase),
!,
make_colour_browser(CB, DataBase).
make_colour_browser(CB) :-
make_colour_browser(CB, @colour_names).
make_colour_browser(CB, DataBase) :-
new(D, dialog),
send(D, append, new(M, menu(which, choice))),
send_list(M, append, [foreground, background]),
send(M, selection, background),
send(new(CB, browser('XPCE (X11) named colours')), below, D),
send(CB, width, 40),
send(CB, font, fixed),
send(CB?key_binding, function, % pretend arrow up/down not only
cursor_down, % do the preview, but also show
and(message(CB, next_line),% the colour immediately
message(CB, enter))),
send(CB?key_binding, function,
cursor_up,
and(message(CB, previous_line),
message(CB, enter))),
% Make a picture with some different
% graphicals for preview
send(new(P, picture(size := size(100, 25))), below, CB),
send(P, ver_stretch, 0),
send(P, ver_shrink, 0),
send(P, format, new(Fmt, format(vertical, 1, @on))),
send(Fmt, adjustment, vector(center)),
send(P, display, graphical(0, 0, 0, 25)),
send(P, display, text(hello, left, normal)),
send(P, display, text(hello, left, bold)),
send(P, display, new(Box, box(30, 12))),
send(P, display, line(0, 0, 30, 0)),
send(Box, fill_pattern, @black_image),
% A colour is selected; call
% selected_colour/3, using the
% picture, fore/back ground and
% the description of the colour
send(CB, select_message,
message(@prolog, selected_colour, P, M?selection, @arg1?label)),
% set tab-stops for nice alignment
send(CB?image, tab_stops, vector(170)),
% scan de database
( send(DataBase, instance_of, hash_table)
-> send(DataBase, for_all,
message(@prolog, append_colour, CB, @arg1, @arg2)),
send(CB, sort)
; new(F, file(DataBase)),
( send(F, open, read)
-> repeat,
( get(F, read_line, String)
-> get(String, scan, '%d%d%d%*[ \t]%[a-zA-Z0-9_ ]',
vector(R, G, B, Name)),
format(atom(HexName), '#~|~`0t~16r~2+~`0t~16r~2+~`0t~16r~2+', [R,G,B]),
send(Name, translate, ' ', '_'),
send(Name, downcase),
get(Name, value, Atom),
( get(CB, member, Atom, _)
-> true
; send(CB, append,
dict_item(Name,
string('%s\t%3d %3d %3d %s',
Name, R, G, B, HexName)))
),
fail
; !,
send(F, close)
)
)
).
append_colour(CB, Name, RGB) :-
B is RGB >> 16,
G is (RGB >> 8) /\ 255,
R is (RGB /\ 255),
format(atom(HexName), '#~|~`0t~16r~2+~`0t~16r~2+~`0t~16r~2+', [R,G,B]),
send(CB, append, string('%s\t%3d %3d %3d %s', Name, R, G, B, HexName)).
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
A colour was selected. Change the colour attribute of the picture window.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
selected_colour(P, Which, Label) :-
get(Label, scan, '%s%d%d%d', vector(NameStr, R, G, B)),
send(@display, cut_buffer, 0, NameStr),
XR is R * 257,
XG is G * 257,
XB is B * 257,
send(P, Which, colour(@default, XR, XG, XB)).
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