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eda-tools/eeshow/gui-aoi.c

208 lines
3.6 KiB
C

/*
* gui-aoi.c - GUI: areas of interest
*
* Written 2016 by Werner Almesberger
* Copyright 2016 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.
*/
/*
* Resources:
*
* http://zetcode.com/gfx/cairo/cairobackends/
* https://developer.gnome.org/gtk3/stable/gtk-migrating-2-to-3.html
*/
#include <stddef.h>
#include <math.h>
#include <assert.h>
#include "util.h"
#include "gui-aoi.h"
#define DRAG_RADIUS 5
static const struct aoi *hovering = NULL;
static const struct aoi *clicked = NULL;
static const struct aoi *dragging = NULL;
static int clicked_x, clicked_y;
struct aoi *aoi_add(struct aoi **aois, const struct aoi *cfg)
{
struct aoi *new;
new = alloc_type(struct aoi);
*new = *cfg;
new->next = *aois;
*aois = new;
return new;
}
void aoi_update(struct aoi *aoi, const struct aoi *cfg)
{
struct aoi *next = aoi->next;
*aoi = *cfg;
aoi->next = next;
}
static const struct aoi *find_aoi(const struct aoi *aois, int x, int y)
{
const struct aoi *aoi;
for (aoi = aois; aoi; aoi = aoi->next)
if (x >= aoi->x && x < aoi->x + aoi->w &&
y >= aoi->y && y < aoi->y + aoi->h)
break;
return aoi;
}
static bool aoi_on_list(const struct aoi *aois, const struct aoi *ref)
{
const struct aoi *aoi;
for (aoi = aois; aoi; aoi = aoi->next)
if (aoi == ref)
return 1;
return 0;
}
bool aoi_hover(const struct aoi *aois, int x, int y)
{
const struct aoi *aoi;
if (dragging)
return 0;
if (hovering) {
if (x >= hovering->x && x < hovering->x + hovering->w &&
y >= hovering->y && y < hovering->y + hovering->h)
return 1;
hovering->hover(hovering->user, 0);
hovering = NULL;
}
aoi = find_aoi(aois, x, y);
if (aoi && aoi->hover && aoi->hover(aoi->user, 1)) {
hovering = aoi;
return 1;
}
return 0;
}
bool aoi_move(const struct aoi *aois, int x, int y)
{
if (dragging) {
if (aoi_on_list(aois, dragging)) {
dragging->drag(dragging->user,
x - clicked_x, y - clicked_y);
clicked_x = x;
clicked_y = y;
}
return 1;
}
if (!clicked)
return 0;
/*
* Ensure we're on the right list and are using the same coordinate
* system.
*/
if (!aoi_on_list(aois, clicked))
return 0;
if (hypot(x - clicked_x, y - clicked_y) > DRAG_RADIUS) {
if (clicked && clicked->drag) {
dragging = clicked;
dragging->drag(dragging->user,
x - clicked_x, y - clicked_y);
clicked_x = x;
clicked_y = y;
}
clicked = NULL;
}
return 1;
}
bool aoi_down(const struct aoi *aois, int x, int y)
{
assert(!clicked);
aoi_dehover();
clicked = find_aoi(aois, x, y);
if (!clicked)
return 0;
if (!clicked->click) {
clicked = NULL;
return 0;
}
clicked_x = x;
clicked_y = y;
return 1;
}
bool aoi_up(const struct aoi *aois, int x, int y)
{
const struct aoi *aoi;
if (!aoi_move(aois, x, y))
return 0;
/*
* Ensure we're on the right list and are using the same coordinate
* system.
*/
for (aoi = aois; aoi; aoi = aoi->next)
if (aoi == clicked || aoi == dragging)
break;
if (!aoi)
return 0;
if (dragging) {
dragging = NULL;
return 1;
}
clicked->click(clicked->user);
clicked = NULL;
return 1;
}
void aoi_remove(struct aoi **aois, const struct aoi *aoi)
{
if (hovering == aoi) {
aoi->hover(aoi->user, 0);
hovering = NULL;
}
while (*aois != aoi)
aois = &(*aois)->next;
*aois = aoi->next;
free((void *) aoi);
}
void aoi_dehover(void)
{
if (hovering)
hovering->hover(hovering->user, 0);
hovering = NULL;
}