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      1 /*	$NetBSD: panel_impl.h,v 1.3 2022/04/19 20:32:17 rillig Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2015 Valery Ushakov
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #ifndef _PANEL_IMPL_H_
     29 #define _PANEL_IMPL_H_
     30 
     31 #include "panel.h"
     32 
     33 #include <sys/queue.h>
     34 
     35 #define DECK_HEAD(head)		TAILQ_HEAD(head, __panel)
     36 #define DECK_ENTRY		TAILQ_ENTRY(__panel)
     37 
     38 
     39 /*
     40  * Panels are just curses windows with Z-order added.
     41  * See update_panels() for details.
     42  */
     43 struct __panel {
     44 	WINDOW *win;
     45 	char *user;
     46 	DECK_ENTRY zorder;
     47 };
     48 
     49 
     50 /* Deck of panels in Z-order from bottom to top. */
     51 DECK_HEAD(deck);
     52 extern struct deck _deck __dso_hidden;
     53 
     54 /* Fake stdscr panel at the bottom, not user visible */
     55 extern PANEL _stdscr_panel __dso_hidden;
     56 
     57 
     58 /*
     59  * Hidden panels are not in the deck.  <sys/queue.h> macros don't have
     60  * a concept of an entry not on the list, so provide a kludge that
     61  * digs into internals.
     62  */
     63 #define TAILQ_REMOVE_NP(head, elm, field) do {	\
     64 	TAILQ_REMOVE((head), (elm), field);	\
     65 	(elm)->field.tqe_next = NULL;		\
     66 	(elm)->field.tqe_prev = NULL;		\
     67 } while (0)
     68 
     69 #define TAILQ_LINKED_NP(elm, field) \
     70 	(((elm)->field.tqe_prev) != NULL)
     71 
     72 
     73 #define DECK_INSERT_TOP(p) do {					\
     74 	TAILQ_INSERT_TAIL(&_deck, (p), zorder);			\
     75 } while (0)
     76 
     77 #define DECK_INSERT_BOTTOM(p) do {				\
     78 	TAILQ_INSERT_AFTER(&_deck, &_stdscr_panel, (p), zorder); \
     79 } while (0)
     80 
     81 #define DECK_REMOVE(p) do {					\
     82 	TAILQ_REMOVE_NP(&_deck, (p), zorder);			\
     83 } while (0)
     84 
     85 
     86 #define PANEL_ABOVE(p)		(TAILQ_NEXT((p), zorder))
     87 #define PANEL_BELOW(p)		(TAILQ_PREV((p), deck, zorder))
     88 #define PANEL_HIDDEN(p)		(!TAILQ_LINKED_NP((p), zorder))
     89 
     90 #define FOREACH_PANEL(var)	TAILQ_FOREACH(var, &_deck, zorder)
     91 
     92 #endif	/* _PANEL_IMPL_H_ */
     93