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fsm.c
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fsm.c
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/*
ClickLock: you can highlight or drag without holding the mouse button
Copyright (C) 2014 German Maglione <[email protected]>
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 3 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#pragma GCC diagnostic ignored "-Wunused-parameter"
#include "fsm.h"
/* Simple (and not quite right) FSM */
static struct timeval down_ev_time;
/* Event helpers */
#define IS_DOWN_EVENT(ev) ((ev)->value)
#define IS_RELEASE_EVENT(ev) (!(ev)->value)
#define GET_EVENT(ev) ((ev)->value)
/* States definitions */
static void state_init(const struct input_event *ev, const struct timeval *timeout);
static void state_btn_up(const struct input_event *ev, const struct timeval *timeout);
static void state_btn_down(const struct input_event *ev, const struct timeval *timeout);
static void state_locked(const struct input_event *ev, const struct timeval *timeout);
/* Initial state */
state_fn_ptr state = state_init;
/* States implementations */
static void state_init(const struct input_event *ev, const struct timeval *timeout) {
assert(ev != NULL);
if (IS_DOWN_EVENT(ev)) {
down_ev_time = ev->time;
state = state_btn_down;
vmouse_send_btn_event(GET_EVENT(ev));
} else {
state = state_btn_up; // Release event
}
}
static void state_btn_up(const struct input_event *ev, const struct timeval *timeout) {
assert(ev != NULL);
if (IS_DOWN_EVENT(ev)) {
down_ev_time = ev->time;
state = state_btn_down;
vmouse_send_btn_event(GET_EVENT(ev));
}
}
static void state_btn_down(const struct input_event *ev, const struct timeval *timeout) {
assert(ev != NULL);
if (IS_RELEASE_EVENT(ev)) {
struct timeval elapsed_time;
timersub(&(ev->time), &down_ev_time, &elapsed_time);
if (timercmp(&elapsed_time, timeout, >=)) {
state = state_locked; // Click locked
} else {
state = state_btn_up;
vmouse_send_btn_event(GET_EVENT(ev));
}
}
}
static void state_locked(const struct input_event *ev, const struct timeval *timeout) {
assert(ev != NULL);
if (IS_RELEASE_EVENT(ev)) {
state = state_btn_up; // Click unlocked
vmouse_send_btn_event(GET_EVENT(ev));
}
}