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/widget.h')

diff --git a/src/tk/widget.h b/src/tk/widget.h
index 64b8b58..83abe0b 100644
--- a/src/tk/widget.h
+++ b/src/tk/widget.h
@@ -23,18 +23,33 @@
 #include <SDL.h>
 #include <stdarg.h>
 
+void
+mftk_window_index(struct mftk_window *win, struct mftk_widget *wid);
+
+enum mftk_widget_role {
+	MFTK_WIDGET_ROLE_NONE,
+	MFTK_WIDGET_ROLE_FOCUSABLE,
+	MFTK_WIDGET_ROLE_CONTAINER
+};
+
 struct mftk_widget {
-	int                  w;
-	int                  h;
-	struct mftk_widget  *container;
-	int                  vis;
-	int                  can_focus;
-	void               (*layout)(struct mftk_widget *);
-	int                (*event)(struct mftk_widget *, SDL_Event *,
+	int                     w;
+	int                     h;
+	struct mftk_widget     *container;
+	int                     vis;
+	void                  (*layout)(struct mftk_widget *);
+	void                  (*index)(struct mftk_widget *,
+			struct mftk_window *);
+	int                   (*event)(struct mftk_widget *, SDL_Event *,
 			int, int);
-	int                (*render)(struct mftk_widget *, SDL_Renderer *,
+	int                   (*render)(struct mftk_widget *, SDL_Renderer *,
 			int, int);
-	void               (*destroy)(struct mftk_widget *);
+	void                  (*destroy)(struct mftk_widget *);
+	enum mftk_widget_role   role;
+	struct mftk_widget     *prev;
+	struct mftk_widget     *next;
+	struct mftk_window     *window;
+	int                     focused;
 };
 
 struct mftk_widget *
@@ -50,6 +65,34 @@ mftk_widget_new(size_t size);
 		w->event   = &_mftk_##name##_event; \
 		w->render  = &_mftk_##name##_render; \
 		w->destroy = &_mftk_##name##_destroy; \
+		w->role = MFTK_WIDGET_ROLE_NONE; \
+		t_w = (struct mftk_##name *) w; \
+	} while (0)
+#define mftk_widget_init_focusable(w, t_w, name) \
+	do { \
+		w = mftk_widget_new(sizeof(struct mftk_##name)); \
+		if (w == NULL) { \
+			return NULL; \
+		}; \
+		w->layout  = &_mftk_##name##_layout; \
+		w->event   = &_mftk_##name##_event; \
+		w->render  = &_mftk_##name##_render; \
+		w->destroy = &_mftk_##name##_destroy; \
+		w->role = MFTK_WIDGET_ROLE_FOCUSABLE; \
+		t_w = (struct mftk_##name *) w; \
+	} while (0)
+#define mftk_widget_init_container(w, t_w, name) \
+	do { \
+		w = mftk_widget_new(sizeof(struct mftk_##name)); \
+		if (w == NULL) { \
+			return NULL; \
+		}; \
+		w->layout  = &_mftk_##name##_layout; \
+		w->index   = &_mftk_##name##_index; \
+		w->event   = &_mftk_##name##_event; \
+		w->render  = &_mftk_##name##_render; \
+		w->destroy = &_mftk_##name##_destroy; \
+		w->role = MFTK_WIDGET_ROLE_CONTAINER; \
 		t_w = (struct mftk_##name *) w; \
 	} while (0)
 
@@ -63,6 +106,9 @@ mftk_widget_get_visible(struct mftk_widget *w)
 void
 mftk_widget_layout(struct mftk_widget *w);
 
+void
+mftk_widget_index(struct mftk_widget *w, struct mftk_window *win);
+
 int
 mftk_widget_event(struct mftk_widget *w, SDL_Event *e, int x, int y);
 
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