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/* xkbtimer.c -- Manage XKB timers.
Copyright (C) 2003, 2004 Marco Gerards
Written by Marco Gerards <marco@student.han.nl>
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. */
/* XKB requires a timer for key repeat and accessibility. Carefully
stack all compatibility features. */
#include <mach.h>
#include <errno.h>
#include <assert.h>
#include "xkb.h"
#include <timer.h>
/* For key repeat. */
static int key_delay = 0;
static int key_repeat = 0;
/* SlowKeys. */
static int slowkeys_delay = 50;
static int slowkeys_active = 0;
/* BounceKeys. */
static int bouncekeys_delay = 100;
static int bouncekeys_active = 0;
/* The current status of the timer. */
enum timer_status
{
timer_stopped,
timer_slowkeys,
timer_repeat_delay,
timer_repeating
};
/* Timer used to time key controls. */
static struct per_key_timer
{
/* Used for slowkeys and repeat. */
struct timer_list enable_timer;
/* Status of the enable timer. */
enum timer_status enable_status;
/* Used for bouncekeys. */
struct timer_list disable_timer;
} per_key_timers[255];
/* The last pressed key. Only this key may generate keyrepeat events. */
static int lastkey = 0;
error_t
xkb_handle_key (keycode_t kc)
{
static keycode_t prevkc = 0;
keypress_t key;
key.keycode = kc & 127;
key.prevkc = prevkc;
key.repeat = (prevkc == kc);
key.redir = 0;
key.rel = kc & 128;
keystate[key.keycode & 127].keypressed = key.rel ? 0 : 1;
debug_printf ("PRESSED: %d\n", !(key.rel));
xkb_input (key);
prevkc = key.keycode;
return 0;
}
error_t
xkb_init_repeat (int delay, int repeat)
{
error_t err;
err = timer_init ();
if (err)
return err;
key_delay = delay;
key_repeat = repeat;
return 0;
}
static int
key_enable (void *handle)
{
int key = (int) handle;
/* Enable the key. */
keystate[key].disabled = 0;
return 0;
}
/* Called by key timer. The global variable timer_status determines
the current control. */
static int
key_timing (void *handle)
{
int current_key = (int) handle;
xkb_handle_key (current_key);
/* Another key was pressed after this key, stop repeating. */
if (lastkey != current_key)
{
per_key_timers[current_key].enable_status = timer_stopped;
return 0;
}
switch (per_key_timers[current_key].enable_status)
{
case timer_stopped:
assert ("Stopped timer triggered timer event\n");
break;
case timer_slowkeys:
per_key_timers[current_key].enable_timer.expires
= fetch_jiffies () + key_delay;
lastkey = current_key;
if (keys[current_key].flags & KEYNOREPEAT)
{
per_key_timers[current_key].enable_status = timer_stopped;
/* Stop the timer. */
return 0;
}
else
{
per_key_timers[current_key].enable_status = timer_repeat_delay;
}
break;
case timer_repeat_delay:
per_key_timers[current_key].enable_status = timer_repeating;
/* Fall through. */
case timer_repeating:
per_key_timers[current_key].enable_timer.expires
= fetch_jiffies () + key_repeat;
break;
}
return 1;
}
error_t
xkb_input_key (int key)
{
int pressed = !(key & 128);
int keyc = key & 127;
debug_printf ("KEYIN: %d\n", key);
/* Filter out any double or disabled keys. */
if (key == lastkey || keystate[keyc].disabled)
return 0;
/* Always handle keyrelease events. */
if (!pressed)
{
/* Stop the timer for this released key. */
if (per_key_timers[keyc].enable_status != timer_stopped)
{
timer_remove (&per_key_timers[keyc].enable_timer);
per_key_timers[keyc].enable_status = timer_stopped;
}
/* No more last key; it was released. */
if (keyc == lastkey)
lastkey = 0;
/* Make sure the key was pressed before releasing it, it might
not have been accepted. */
if (keystate[key & 127].keypressed)
xkb_handle_key (key);
/* If bouncekeys is active, disable the key. */
if (bouncekeys_active)
{
keystate[keyc].disabled = 1;
/* Setup a timer to enable the key. */
timer_clear (&per_key_timers[keyc].disable_timer);
per_key_timers[keyc].disable_timer.fnc = key_enable;
per_key_timers[keyc].disable_timer.fnc_data = (void *) keyc;
per_key_timers[keyc].disable_timer.expires
= fetch_jiffies () + bouncekeys_delay;
timer_add (&per_key_timers[keyc].disable_timer);
}
return 0;
}
/* Setup the timer for slowkeys. */
timer_clear (&per_key_timers[keyc].enable_timer);
lastkey = keyc;
per_key_timers[keyc].enable_timer.fnc = key_timing;
per_key_timers[keyc].enable_timer.fnc_data = (void *) keyc;
if (slowkeys_active)
{
per_key_timers[keyc].enable_status = timer_slowkeys;
per_key_timers[keyc].enable_timer.expires
= fetch_jiffies () + slowkeys_delay;
}
else
{
/* Immediately report the keypress. */
xkb_handle_key (keyc);
/* Check if this repeat is allowed for this keycode. */
if (keys[keyc].flags & KEYNOREPEAT)
return 0; /* Nope. */
per_key_timers[keyc].enable_status = timer_repeat_delay;
per_key_timers[keyc].enable_timer.expires
= fetch_jiffies () + key_delay;
}
timer_add (&per_key_timers[keyc].enable_timer);
return 0;
}
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