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-rw-r--r--gui-aoi.c81
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+/*
+ * 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 "util.h"
+#include "gui-aoi.h"
+
+
+static const struct aoi *hovering = NULL;
+
+
+void aoi_add(struct aoi **aois, const struct aoi *aoi)
+{
+ struct aoi *new;
+
+ new = alloc_type(struct aoi);
+ *new = *aoi;
+ new->next = *aois;
+ *aois = new;
+}
+
+
+bool aoi_hover(const struct aoi *aois, int x, int y)
+{
+ const struct aoi *aoi;
+
+ 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;
+ }
+
+ 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;
+ if (aoi && aoi->hover && aoi->hover(aoi->user, 1)) {
+ hovering = aoi;
+ return 1;
+ }
+ return 0;
+}
+
+
+bool aoi_click(const struct aoi *aois, int x, int y)
+{
+ const struct aoi *aoi;
+
+ if (hovering) {
+ hovering->hover(hovering->user, 0);
+ hovering = NULL;
+ }
+ 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;
+ if (aoi && aoi->click) {
+ aoi->click(aoi->user);
+ return 1;
+ }
+ return 0;
+}