77 lines
2.5 KiB
Perl
77 lines
2.5 KiB
Perl
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/* $Id$
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Part of SWI-Prolog
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Author: Jan Wielemaker
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E-mail: J.Wielemaker@uva.nl
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WWW: http://www.swi-prolog.org
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Copyright (C): 1985-2009, University of Amsterdam
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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As a special exception, if you link this library with other files,
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compiled with a Free Software compiler, to produce an executable, this
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library does not by itself cause the resulting executable to be covered
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by the GNU General Public License. This exception does not however
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invalidate any other reasons why the executable file might be covered by
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the GNU General Public License.
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*/
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:- module('$win_menu',
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[ win_insert_menu_item/4, % +PopupName, +Item, +Before, :Goal
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win_has_menu/0 % Test whether we have menus
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]).
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:- meta_predicate
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win_insert_menu_item(+,+,+,:).
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%:- multifile
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% prolog:on_menu/1.
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:- dynamic
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menu_action/2.
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:- volatile
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menu_action/2.
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prolog:on_menu(Label) :-
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menu_action(Label, Action),
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catch(Action, Error,
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print_message(error, Error)).
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% win_has_menu
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%
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% Test whether the system provides the menu interface
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prolog:win_has_menu :-
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current_predicate(_, system:'$win_insert_menu_item'(_, _, _)).
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% win_insert_menu_item(+Popup, +Item, +Before, :Goal)
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%
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% Add a menu-item to the PLWIN.EXE menu. See the reference manual
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% for details.
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prolog:win_insert_menu_item(Popup, --, Before, _Goal) :- !,
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call(system:'$win_insert_menu_item'(Popup, --, Before)). % fool check/0
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prolog:win_insert_menu_item(Popup, Item, Before, Goal) :-
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insert_menu_item(Popup, Item, Before, Goal).
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insert_menu_item(Popup, Item, Before, Goal) :-
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( menu_action(Item, OldGoal),
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OldGoal \== Goal
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-> throw(error(permission_error(redefine, Item),
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win_insert_menu_item/4))
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; true
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),
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call(system:'$win_insert_menu_item'(Popup, Item, Before)),
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assert(menu_action(Item, Goal)).
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