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/*
* gui_over.c - GUI, canvas overlays
*
* Written 2009, 2010 by Werner Almesberger
* Copyright 2009, 2010 by Werner Almesberger
*
* 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 file is for the overlay state machine only. Given the heavy use of
* global variables, adding other functionality would quickly render it
* illegible.
*/
#include <stdlib.h>
#include <stdio.h>
#include "coord.h"
#include "gui_util.h"
#include "gui_over.h"
#if 0
#define DPRINTF(fmt, ...) fprintf(stderr, fmt "\n", ##__VA_ARGS__)
#define DSAVE(pix_buf) debug_save_pixbuf(pix_buf->buf)
#else
#define DPRINTF(fmt, ...)
#define DSAVE(buf)
#endif
static enum states {
NOTHING,
HOVER,
DRAG,
BOTH,
} state = NOTHING;
/*
* We cache some externally provided state so that we can redraw without the
* outside telling us what to redraw, etc.
*/
static struct pix_buf *buf_D, *buf_H;
static struct pix_buf *(*over_D_save_and_draw)(void *user, struct coord to);
static void *over_D_user;
static struct pix_buf *(*over_H_save_and_draw)(void *user);
static void *over_H_user;
static struct coord over_pos;
/* ----- actions ----------------------------------------------------------- */
static void draw_D(void)
{
buf_D = over_D_save_and_draw(over_D_user, over_pos);
DSAVE(buf_D);
}
static void draw_H(void)
{
buf_H = over_H_save_and_draw(over_H_user);
DSAVE(buf_H);
}
#define STATE(s) DPRINTF("%s", #s); state = s; break;
#define restore(x) DPRINTF(" restore(%s)", #x); restore_pix_buf(buf_##x)
#define drop(x) DPRINTF(" drop(%s)", #x); free_pix_buf(buf_##x)
#define save(x) DPRINTF(" save(%s)", #x)
#define draw(x) DPRINTF(" draw(%s)", #x); draw_##x()
#define update() DPRINTF(" update"); over_pos = pos
/* ----- state machine ----------------------------------------------------- */
void over_enter(struct pix_buf *(*save_and_draw)(void *user), void *user)
{
over_H_save_and_draw = save_and_draw;
over_H_user = user;
DPRINTF("enter");
switch (state) {
case NOTHING:
save(H);
draw(H);
STATE(HOVER);
case DRAG:
restore(D);
save(H);
draw(H);
save(D);
draw(D);
STATE(BOTH);
default:
abort();
}
}
void over_leave(void)
{
DPRINTF("leave");
switch (state) {
case HOVER:
restore(H);
STATE(NOTHING);
case BOTH:
restore(D);
restore(H);
save(D);
draw(D);
STATE(DRAG);
default:
abort();
}
}
void over_begin(struct pix_buf *(*save_and_draw)(void *user, struct coord to),
void *user, struct coord pos)
{
over_pos = pos;
over_D_save_and_draw = save_and_draw;
over_D_user = user;
DPRINTF("begin");
switch (state) {
case NOTHING:
save(D);
draw(D);
STATE(DRAG);
case HOVER:
save(D);
draw(D);
STATE(BOTH);
default:
abort();
}
}
void over_move(struct coord pos)
{
over_pos = pos;
DPRINTF("move");
switch (state) {
case NOTHING:
break;
case HOVER:
break;
case DRAG:
restore(D);
update();
save(D);
draw(D);
STATE(DRAG);
case BOTH:
restore(D);
update();
save(D);
draw(D);
STATE(BOTH);
default:
abort();
}
}
void over_end(void)
{
DPRINTF("end");
switch (state) {
case DRAG:
restore(D);
STATE(NOTHING);
case BOTH:
restore(D);
STATE(HOVER);
default:
abort();
}
}
void over_reset(void)
{
DPRINTF("reset");
switch (state) {
case NOTHING:
break;
case HOVER:
drop(H);
STATE(NOTHING);
case DRAG:
drop(D);
STATE(NOTHING);
case BOTH:
drop(D);
drop(H);
STATE(NOTHING);
default:
abort();
}
}
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