quakeforge/libs/video/targets/in_event.c

/*
	in_event.c

	input event handling

	Copyright (C) 2001 Bill Currie <bill@taniwha.org>

	Author: Bill Currie <bill@taniwha.org>
	Date: 2001/8/9

	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:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

static __attribute__ ((unused)) const char rcsid[] = 
	"$Id$";

#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include <stdlib.h>

#include "QF/in_event.h"

static int (**event_handler_list)(const IE_event_t*);
static int eh_list_size;
static int focus;

void
IE_Init (void)
{
	eh_list_size = 8;	// start with 8 slots. will grow dynamicly if needed
	event_handler_list = calloc (eh_list_size, sizeof (event_handler_list[0]));
}

void
IE_Init_Cvars (void)
{
}

void
IE_Shutdown (void)
{
}

int
IE_Send_Event (const IE_event_t *event)
{
	if (event_handler_list[focus])
		return event_handler_list[focus](event);
	return 0;
}

int
IE_Add_Handler (int (*event_handler)(const IE_event_t*))
{
	int     i;

	while (1) {
		int (**t)(const IE_event_t*);
		for (i = 0; i < eh_list_size; i++) {
			if (!event_handler_list[i]) {
				event_handler_list[i] = event_handler;
				return i;
			}
		}
		if (!(t = realloc (event_handler_list, eh_list_size + 8)))
			return -1;
		event_handler_list = t;
		memset (event_handler_list + eh_list_size, 0,
				8 * sizeof (event_handler_list[0]));
		eh_list_size += 8;
	}
}

void
IE_Remove_Handler (int handle)
{
	if (handle >= 0 && handle < eh_list_size)
		event_handler_list[handle] = 0;
}

void
IE_Set_Focus (int handle)
{
	if (handle >= 0 && handle < eh_list_size
		&& event_handler_list[handle]
		&& focus != handle) {
		IE_event_t event;
		event.type = ie_lose_focus;
		IE_Send_Event (&event);
		focus = handle;
		event.type = ie_gain_focus;
		IE_Send_Event (&event);
	}
}