From 29fb8700572cfa1687d84e0a9376e2cd991c3a7a Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Thu, 18 Mar 2021 19:00:02 -0400
Subject: main-menu: Link buttons (for tab key nav)

---
diff --git a/src/main-menu.c b/src/main-menu.c
index 9583668..f1a3830 100644
--- a/src/main-menu.c
+++ b/src/main-menu.c
@@ -34,6 +34,8 @@ struct _db_main_menu_button {
 	struct _db_main_menu_button *d;
 	struct _db_main_menu_button *l;
 	struct _db_main_menu_button *r;
+	struct _db_main_menu_button *p;
+	struct _db_main_menu_button *n;
 };
 
 static SDL_Texture *
@@ -175,6 +177,7 @@ db_main_menu(void)
 			&buttons[1]->rect);
 
 	/* Render game buttons */
+	buttons[1]->n = buttons[0];  /* Quit button link (may change below) */
 	for (i = 0; i < n; ++i) {
 		buttons[i + 2] = malloc(sizeof(**buttons));
 		if (buttons[i + 2] == NULL) {
@@ -214,6 +217,11 @@ db_main_menu(void)
 		}
 		buttons[i + 2]->l = NULL;
 		buttons[i + 2]->r = buttons[0];
+		buttons[i + 2]->p = buttons[i + 1];
+		buttons[i + 1]->n = buttons[i + 2];
+	}
+	if (n > 0) {
+		buttons[i + 1]->n = buttons[0];
 	}
 
 	/* Help button links */
@@ -225,6 +233,8 @@ db_main_menu(void)
 		buttons[0]->l = NULL;
 	}
 	buttons[0]->r = NULL;
+	buttons[0]->p = buttons[1 + n];
+	buttons[0]->n = buttons[1];
 
 	/* Quit button links */
 	buttons[1]->u = buttons[0];
@@ -235,6 +245,7 @@ db_main_menu(void)
 		buttons[1]->l = NULL;
 	}
 	buttons[1]->r = NULL;
+	buttons[1]->p = buttons[0];
 
 	SDL_RenderPresent(renderer);
 	SDL_Delay(1000);
--
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