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If A is related to B, then A can receive clicks while B is hovering, without getting B de-hovered. Note that in aoi_set_related(A, B), more than one A can share one B, but an A can't have more than one B.
142 lines
2.5 KiB
C
142 lines
2.5 KiB
C
/*
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* gui/aoi.c - GUI: areas of interest
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*
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* Written 2016 by Werner Almesberger
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* Copyright 2016 by Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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/*
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* Resources:
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*
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* http://zetcode.com/gfx/cairo/cairobackends/
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* https://developer.gnome.org/gtk3/stable/gtk-migrating-2-to-3.html
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*/
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#include <stddef.h>
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#include <math.h>
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#include <assert.h>
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#include "misc/util.h"
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#include "gui/aoi.h"
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static const struct aoi *hovering = NULL;
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struct aoi *aoi_add(struct aoi **aois, const struct aoi *cfg)
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{
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struct aoi *new;
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new = alloc_type(struct aoi);
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*new = *cfg;
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new->next = *aois;
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*aois = new;
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return new;
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}
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void aoi_update(struct aoi *aoi, const struct aoi *cfg)
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{
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struct aoi *next = aoi->next;
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*aoi = *cfg;
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aoi->next = next;
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}
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static const struct aoi *find_aoi(const struct aoi *aois, int x, int y)
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{
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const struct aoi *aoi;
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for (aoi = aois; aoi; aoi = aoi->next)
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if (x >= aoi->x && x < aoi->x + aoi->w &&
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y >= aoi->y && y < aoi->y + aoi->h)
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break;
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return aoi;
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}
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bool aoi_hover(const struct aoi *aois, int x, int y)
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{
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const struct aoi *aoi;
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if (hovering) {
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if (x >= hovering->x && x < hovering->x + hovering->w &&
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y >= hovering->y && y < hovering->y + hovering->h)
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return 1;
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hovering->hover(hovering->user, 0);
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hovering = NULL;
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}
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aoi = find_aoi(aois, x, y);
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if (aoi && aoi->hover && aoi->hover(aoi->user, 1)) {
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hovering = aoi;
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return 1;
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}
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return 0;
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}
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static bool need_dehover(const struct aoi *aois)
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{
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const struct aoi *aoi;
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if (!hovering)
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return 0;
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if (hovering->click)
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return 0;
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for (aoi = aois; aoi; aoi = aoi->next)
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if (aoi->related == hovering && aoi->click)
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return 0;
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return 1;
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}
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bool aoi_click(const struct aoi *aois, int x, int y)
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{
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const struct aoi *aoi;
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if (need_dehover(aois))
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aoi_dehover();
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aoi = find_aoi(aois, x, y);
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if (!aoi || !aoi->click)
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return 0;
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aoi->click(aoi->user);
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return 1;
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}
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void aoi_set_related(struct aoi *aoi, const struct aoi *related)
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{
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assert(!aoi->related);
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aoi->related = related;
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}
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void aoi_remove(struct aoi **aois, const struct aoi *aoi)
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{
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if (hovering == aoi) {
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aoi->hover(aoi->user, 0);
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hovering = NULL;
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}
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while (*aois != aoi)
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aois = &(*aois)->next;
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*aois = aoi->next;
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free((void *) aoi);
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}
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void aoi_dehover(void)
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{
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if (hovering)
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hovering->hover(hovering->user, 0);
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hovering = NULL;
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}
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