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162 lines
3.1 KiB
C
162 lines
3.1 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 bool in_aoi(const struct aoi *aoi, int x, int y)
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{
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return x >= aoi->x && x < aoi->x + aoi->w &&
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y >= aoi->y && y < aoi->y + aoi->h;
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}
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static bool hover_d(const struct aoi *aoi, bool on,int x, int y)
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{
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return aoi->hover(aoi->user, on,
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x < aoi->x ? -1 : x >= aoi->x + aoi->w ? 1 : 0,
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y < aoi->y ? -1 : y >= aoi->y + aoi->h ? 1 : 0);
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}
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/*
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* We need a pointer to the anchor of the AoI list here because dehovering may
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* delete the AoI *aois points to.
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*
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* We could just check if hovering == *aois, but that seems risky, because
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* hover(..., 0) may destroy more than just the AoI being dehovered.
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*/
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bool aoi_hover(struct aoi *const *aois, int x, int y)
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{
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static int last_x = 0;
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static int last_y = 0;
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const struct aoi *aoi;
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if (hovering) {
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if (in_aoi(hovering, x, y))
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return 1;
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hover_d(hovering, 0, x, y);
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hovering = NULL;
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}
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for (aoi = *aois; aoi; aoi = aoi->next)
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if (aoi->hover && in_aoi(aoi, x, y) &&
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hover_d(aoi, 1, last_x, last_y)) {
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hovering = aoi;
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break;
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}
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last_x = x;
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last_y = y;
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return aoi;
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}
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static bool need_dehover(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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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 && in_aoi(aoi, x, y))
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return 0;
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return 1;
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}
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/* Pointer to the anchor needed for the same reason as in aoi_hover. */
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bool aoi_click(struct aoi *const *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, x, y))
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aoi_dehover();
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for (aoi = *aois; aoi; aoi = aoi->next)
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if (aoi->click && in_aoi(aoi, x, y)) {
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aoi->click(aoi->user);
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return 1;
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}
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return 0;
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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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assert(aoi);
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if (hovering == aoi) {
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aoi->hover(aoi->user, 0, 0, 0);
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hovering = NULL;
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}
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while (*aois && *aois != aoi)
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aois = &(*aois)->next;
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assert(*aois);
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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, 0, 0);
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hovering = NULL;
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}
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