expo: Add support for scene menus

A menu is a key part of the expo design. It consists of a number of items
which the user can select from.

Add the initial implementation of this.

Signed-off-by: Simon Glass <sjg@chromium.org>

boot/Makefile

@@ -47,6 +47,8 @@ ifdef CONFIG_SPL_BUILD
 obj-$(CONFIG_SPL_LOAD_FIT) += common_fit.o
 endif
 
+obj-$(CONFIG_$(SPL_TPL_)BOOTMETH_VBE) += expo.o scene.o scene_menu.o
+
 obj-$(CONFIG_$(SPL_TPL_)BOOTMETH_VBE) += vbe.o vbe_request.o
 obj-$(CONFIG_$(SPL_TPL_)BOOTMETH_VBE_SIMPLE) += vbe_simple.o
 obj-$(CONFIG_$(SPL_TPL_)BOOTMETH_VBE_SIMPLE_FW) += vbe_simple_fw.o

boot/scene_menu.c

+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Implementation of a menu in a scene
+ *
+ * Copyright 2022 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#define LOG_CATEGORY	LOGC_BOOT
+
+#include <common.h>
+#include <dm.h>
+#include <expo.h>
+#include <malloc.h>
+#include <mapmem.h>
+#include <menu.h>
+#include <video.h>
+#include <video_console.h>
+#include <linux/input.h>
+#include "scene_internal.h"
+
+static void scene_menuitem_destroy(struct scene_menitem *item)
+{
+	free(item->name);
+	free(item);
+}
+
+void scene_menu_destroy(struct scene_obj_menu *menu)
+{
+	struct scene_menitem *item, *next;
+
+	list_for_each_entry_safe(item, next, &menu->item_head, sibling)
+		scene_menuitem_destroy(item);
+}
+
+/**
+ * menu_point_to_item() - Point to a particular menu item
+ *
+ * Sets the currently pointed-to / highlighted menu item
+ */
+static void menu_point_to_item(struct scene_obj_menu *menu, uint item_id)
+{
+	menu->cur_item_id = item_id;
+}
+
+int scene_menu_arrange(struct scene *scn, struct scene_obj_menu *menu)
+{
+	struct scene_menitem *item;
+	int y, cur_y;
+	int ret;
+
+	y = menu->obj.y;
+	if (menu->title_id) {
+		ret = scene_obj_set_pos(scn, menu->title_id, menu->obj.x, y);
+		if (ret < 0)
+			return log_msg_ret("tit", ret);
+
+		ret = scene_obj_get_hw(scn, menu->title_id, NULL);
+		if (ret < 0)
+			return log_msg_ret("hei", ret);
+
+		y += ret * 2;
+	}
+
+	/*
+	 * Currently everything is hard-coded to particular columns so this
+	 * won't work on small displays and looks strange if the font size is
+	 * small. This can be updated once text measuring is supported in
+	 * vidconsole
+	 */
+	cur_y = -1;
+	list_for_each_entry(item, &menu->item_head, sibling) {
+		int height;
+
+		ret = scene_obj_get_hw(scn, item->desc_id, NULL);
+		if (ret < 0)
+			return log_msg_ret("get", ret);
+		height = ret;
+
+		if (item->flags & SCENEMIF_GAP_BEFORE)
+			y += height;
+
+		/* select an item if not done already */
+		if (!menu->cur_item_id)
+			menu_point_to_item(menu, item->id);
+
+		/*
+		 * Put the label on the left, then leave a space for the
+		 * pointer, then the key and the description
+		 */
+		if (item->label_id) {
+			ret = scene_obj_set_pos(scn, item->label_id, menu->obj.x,
+						y);
+			if (ret < 0)
+				return log_msg_ret("nam", ret);
+		}
+
+		ret = scene_obj_set_pos(scn, item->key_id, menu->obj.x + 230,
+					y);
+		if (ret < 0)
+			return log_msg_ret("key", ret);
+
+		ret = scene_obj_set_pos(scn, item->desc_id, menu->obj.x + 280,
+					y);
+		if (ret < 0)
+			return log_msg_ret("des", ret);
+
+		if (menu->cur_item_id == item->id)
+			cur_y = y;
+
+		if (item->preview_id) {
+			bool hide;
+
+			/*
+			 * put all previews on top of each other, on the right
+			 * size of the display
+			 */
+			ret = scene_obj_set_pos(scn, item->preview_id, -4, y);
+			if (ret < 0)
+				return log_msg_ret("prev", ret);
+
+			hide = menu->cur_item_id != item->id;
+			ret = scene_obj_set_hide(scn, item->preview_id, hide);
+			if (ret < 0)
+				return log_msg_ret("hid", ret);
+		}
+
+		y += height;
+	}
+
+	if (menu->pointer_id && cur_y != -1) {
+		/*
+		 * put the pointer to the right of and level with the item it
+		 * points to
+		 */
+		ret = scene_obj_set_pos(scn, menu->pointer_id,
+					menu->obj.x + 200, cur_y);
+		if (ret < 0)
+			return log_msg_ret("ptr", ret);
+	}
+
+	return 0;
+}
+
+int scene_menu(struct scene *scn, const char *name, uint id,
+	       struct scene_obj_menu **menup)
+{
+	struct scene_obj_menu *menu;
+	int ret;
+
+	ret = scene_obj_add(scn, name, id, SCENEOBJT_MENU,
+			    sizeof(struct scene_obj_menu),
+			    (struct scene_obj **)&menu);
+	if (ret < 0)
+		return log_msg_ret("obj", -ENOMEM);
+
+	if (menup)
+		*menup = menu;
+	INIT_LIST_HEAD(&menu->item_head);
+
+	ret = scene_menu_arrange(scn, menu);
+	if (ret)
+		return log_msg_ret("pos", ret);
+
+	return menu->obj.id;
+}
+
+static struct scene_menitem *scene_menu_find_key(struct scene *scn,
+						  struct scene_obj_menu *menu,
+						  int key)
+{
+	struct scene_menitem *item;
+
+	list_for_each_entry(item, &menu->item_head, sibling) {
+		if (item->key_id) {
+			struct scene_obj_txt *txt;
+			const char *str;
+
+			txt = scene_obj_find(scn, item->key_id, SCENEOBJT_TEXT);
+			if (txt) {
+				str = expo_get_str(scn->expo, txt->str_id);
+				if (str && *str == key)
+					return item;
+			}
+		}
+	}
+
+	return NULL;
+}
+
+int scene_menu_send_key(struct scene *scn, struct scene_obj_menu *menu, int key,
+			struct expo_action *event)
+{
+	struct scene_menitem *item, *cur, *key_item;
+
+	cur = NULL;
+	key_item = NULL;
+
+	if (!list_empty(&menu->item_head)) {
+		list_for_each_entry(item, &menu->item_head, sibling) {
+			/* select an item if not done already */
+			if (menu->cur_item_id == item->id) {
+				cur = item;
+				break;
+			}
+		}
+	}
+
+	if (!cur)
+		return -ENOTTY;
+
+	switch (key) {
+	case BKEY_UP:
+		if (item != list_first_entry(&menu->item_head,
+					     struct scene_menitem, sibling)) {
+			item = list_entry(item->sibling.prev,
+					  struct scene_menitem, sibling);
+			event->type = EXPOACT_POINT;
+			event->select.id = item->id;
+			log_debug("up to item %d\n", event->select.id);
+		}
+		break;
+	case BKEY_DOWN:
+		if (!list_is_last(&item->sibling, &menu->item_head)) {
+			item = list_entry(item->sibling.next,
+					  struct scene_menitem, sibling);
+			event->type = EXPOACT_POINT;
+			event->select.id = item->id;
+			log_debug("down to item %d\n", event->select.id);
+		}
+		break;
+	case BKEY_SELECT:
+		event->type = EXPOACT_SELECT;
+		event->select.id = item->id;
+		log_debug("select item %d\n", event->select.id);
+		break;
+	case BKEY_QUIT:
+		event->type = EXPOACT_QUIT;
+		log_debug("quit\n");
+		break;
+	case '0'...'9':
+		key_item = scene_menu_find_key(scn, menu, key);
+		if (key_item) {
+			event->type = EXPOACT_SELECT;
+			event->select.id = key_item->id;
+		}
+		break;
+	}
+
+	menu_point_to_item(menu, item->id);
+
+	return 0;
+}
+
+int scene_menuitem(struct scene *scn, uint menu_id, const char *name, uint id,
+		   uint key_id, uint label_id, uint desc_id, uint preview_id,
+		   uint flags, struct scene_menitem **itemp)
+{
+	struct scene_obj_menu *menu;
+	struct scene_menitem *item;
+	int ret;
+
+	menu = scene_obj_find(scn, menu_id, SCENEOBJT_MENU);
+	if (!menu)
+		return log_msg_ret("find", -ENOENT);
+
+	/* Check that the text ID is valid */
+	if (!scene_obj_find(scn, desc_id, SCENEOBJT_TEXT))
+		return log_msg_ret("txt", -EINVAL);
+
+	item = calloc(1, sizeof(struct scene_obj_menu));
+	if (!item)
+		return log_msg_ret("item", -ENOMEM);
+	item->name = strdup(name);
+	if (!item->name) {
+		free(item);
+		return log_msg_ret("name", -ENOMEM);
+	}
+
+	item->id = resolve_id(scn->expo, id);
+	item->key_id = key_id;
+	item->label_id = label_id;
+	item->desc_id = desc_id;
+	item->preview_id = preview_id;
+	item->flags = flags;
+	list_add_tail(&item->sibling, &menu->item_head);
+
+	ret = scene_menu_arrange(scn, menu);
+	if (ret)
+		return log_msg_ret("pos", ret);
+
+	if (itemp)
+		*itemp = item;
+
+	return item->id;
+}
+
+int scene_menu_set_title(struct scene *scn, uint id, uint title_id)
+{
+	struct scene_obj_menu *menu;
+	struct scene_obj_txt *txt;
+
+	menu = scene_obj_find(scn, id, SCENEOBJT_MENU);
+	if (!menu)
+		return log_msg_ret("menu", -ENOENT);
+
+	/* Check that the ID is valid */
+	if (title_id) {
+		txt = scene_obj_find(scn, title_id, SCENEOBJT_TEXT);
+		if (!txt)
+			return log_msg_ret("txt", -EINVAL);
+	}
+
+	menu->title_id = title_id;
+
+	return 0;
+}
+
+int scene_menu_set_pointer(struct scene *scn, uint id, uint pointer_id)
+{
+	struct scene_obj_menu *menu;
+	struct scene_obj *obj;
+
+	menu = scene_obj_find(scn, id, SCENEOBJT_MENU);
+	if (!menu)
+		return log_msg_ret("menu", -ENOENT);
+
+	/* Check that the ID is valid */
+	if (pointer_id) {
+		obj = scene_obj_find(scn, pointer_id, SCENEOBJT_NONE);
+		if (!obj)
+			return log_msg_ret("obj", -EINVAL);
+	}
+
+	menu->pointer_id = pointer_id;
+
+	return 0;
+}
+
+int scene_menu_display(struct scene_obj_menu *menu)
+{
+	struct scene *scn = menu->obj.scene;
+	struct scene_obj_txt *pointer;
+	struct expo *exp = scn->expo;
+	struct scene_menitem *item;
+	const char *pstr;
+
+	printf("U-Boot    :    Boot Menu\n\n");
+	if (menu->title_id) {
+		struct scene_obj_txt *txt;
+		const char *str;
+
+		txt = scene_obj_find(scn, menu->title_id, SCENEOBJT_TEXT);
+		if (!txt)
+			return log_msg_ret("txt", -EINVAL);
+
+		str = expo_get_str(exp, txt->str_id);
+		printf("%s\n\n", str);
+	}
+
+	if (list_empty(&menu->item_head))
+		return 0;
+
+	pointer = scene_obj_find(scn, menu->pointer_id, SCENEOBJT_TEXT);
+	pstr = expo_get_str(scn->expo, pointer->str_id);
+
+	list_for_each_entry(item, &menu->item_head, sibling) {
+		struct scene_obj_txt *key = NULL, *label = NULL;
+		struct scene_obj_txt *desc = NULL;
+		const char *kstr = NULL, *lstr = NULL, *dstr = NULL;
+
+		key = scene_obj_find(scn, item->key_id, SCENEOBJT_TEXT);
+		if (key)
+			kstr = expo_get_str(exp, key->str_id);
+
+		label = scene_obj_find(scn, item->label_id, SCENEOBJT_TEXT);
+		if (label)
+			lstr = expo_get_str(exp, label->str_id);
+
+		desc = scene_obj_find(scn, item->desc_id, SCENEOBJT_TEXT);
+		if (desc)
+			dstr = expo_get_str(exp, desc->str_id);
+
+		printf("%3s  %3s  %-10s  %s\n",
+		       pointer && menu->cur_item_id == item->id ? pstr : "",
+		       kstr, lstr, dstr);
+	}
+
+	return -ENOTSUPP;
+}