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/*
Copyright (c) 2003 Bruno T. C. de Oliveira
LICENSE INFORMATION:
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 General Public
License along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Copyright (c) 2002 Bruno T. C. de Oliveira
INFORMAES DE LICENA:
Este programa um software de livre distribuio; voc pode
redistribu-lo e/ou modific-lo sob os termos da GNU General
Public License, conforme publicado pela Free Software Foundation,
pela verso 2 da licena ou qualquer verso posterior.
Este programa distribudo na esperana de que ele ser til
aos seus usurios, porm, SEM QUAISQUER GARANTIAS; sem sequer
a garantia implcita de COMERCIABILIDADE ou DE ADEQUAO A
QUALQUER FINALIDADE ESPECFICA. Consulte a GNU General Public
License para obter mais detalhes (uma cpia acompanha este
programa, armazenada no arquivo COPYING).
*/
/* absmenu.h - an abstract menu that lets creator specify a paint function,
* and even the address of an item count */
#ifndef _btco_aewan_abmenu_h
#define _btco_aewan_abmenu_h
struct _AbsMenu {
int __ic; /* itemcount variable, if the caller chose to use
* nondynamic count */
int *item_count; /* pointer to item count variable. If the caller chose
* nondynamic count, this points to __ic. Can never be
* NULL. */
int x0, y0; /* rendering position onscreen */
int w, h; /* dimensions of renderable area */
int attr_sel, attr_unsel; /* color attributes for selected and
unselected items */
int item_at_top; /* which item index is currently being drawn at
* the top of the menu. This defines the scrolling
* position of the menu. If *item_count > 0,
* this must be a value such that
* 0 <= item_at_top < *item_count */
int sel_item; /* the selected item in the menu. If *item_count > 0,
* this must be a value such that
* 0 <= sel_item < *item_count */
void (*painter)(int i, struct _AbsMenu *menu);
/* painter function that paints menu
entry index i */
};
typedef struct _AbsMenu AbsMenu;
/* Create a new abstract menu.
* ic - address of a variable that will serve as the menu's item count.
* Pass NULL to use an internally maintained count that can be
* manipulated with menu_set_count and menu_get_count.
*
* x0, y0, w, h - a rectangle that indicates the area of the screen to which
* the menu should be rendered
*
* attr_sel, attr_unsel - color attributes to use for selected
* entries and unselected entries. The lowest four bits of an attribute
* is the background color, the next four bits indicate the foreground
* color.
*
* painter - the address of a function that will be called in order to
* paint the menu items. The cursor will be appropriately placed
* before the function call, and the whole line will already have
* been filled with the appropriate color; also, the appropriate
* color will already be set. The function also receives a pointer
* to the menu itself for convenience.
*/
AbsMenu *menu_create(int *ic, int x0, int y0, int w, int h,
int attr_sel, int attr_unsel,
void (*painter)(int, struct _AbsMenu *));
/* Destroys a menu previously created with menu_create */
void menu_destroy(AbsMenu *m);
/* Set the item count for menu m. This can only be used if NULL was
* passed as the <ic> parameter of menu_create when the menu was
* created. */
void menu_set_count(AbsMenu *m, int i);
/* Obtains menu item count */
int menu_get_count(AbsMenu *m);
/* Sets the selected item of the menu. Applies scrolling
* corrections to make sure item is visible */
void menu_select_item(AbsMenu *m, int i);
/* Paints menu to screen. Does not call refresh() */
void menu_paint(AbsMenu *m);
/* Performs appropriate action in response to key ch. For example,
* if ch is KEY_UP, decrement m->sel_item, etc. */
void menu_handle_key(AbsMenu *m, int ch);
#endif
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