From ff36b7225cd146b50cb8e4522ad58aa43c6bc153 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Fri, 06 Aug 2021 08:25:33 -0400
Subject: tk: Build focus tab index

---
(limited to 'src/tk/window.c')

diff --git a/src/tk/window.c b/src/tk/window.c
index 532a2e4..b87e7c0 100644
--- a/src/tk/window.c
+++ b/src/tk/window.c
@@ -26,6 +26,8 @@
 
 struct mftk_window {
 	struct mftk_widget *root;
+	struct mftk_widget *first;
+	struct mftk_widget *focus;
 };
 
 struct mftk_window *
@@ -44,10 +46,31 @@ mftk_window_new(struct mftk_widget *root)
 	w->root = root;
 
 	mftk_widget_layout(w->root);
+	mftk_widget_index(w->root, w);
+	w->focus = w->first;
 
 	return w;
 }
 
+void
+mftk_window_index(struct mftk_window *win, struct mftk_widget *wid)
+{
+	if (win->first == NULL) {
+		win->first = wid;
+		wid->prev = wid;
+		wid->next = wid;
+		return;
+	}
+	/*
+	 * Head: win->first
+	 * Tail: win->first->prev
+	 */
+	wid->prev              = win->first->prev;
+	wid->next              = win->first;
+	win->first->prev->next = wid;
+	win->first->prev       = wid;
+}
+
 int
 mftk_window_event(struct mftk_window *w, SDL_Event *e)
 {
--
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