expo: Move menu-item selection into a function

The current implementation supports a 'pointer' object which points to
the currently highlighted menu item. We want to support highlighting the
label of the menu item instead, e.g. with inverse video. In this case we
will need to 'unhighlight' the old item and highlight the new one.

As a first step, move the pointer logic into a function. This fixes a
bug where the item is hidden when it should not be.

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

1 files changed, 54 insertions, 13 deletions

diff --git a/boot/scene_menu.c b/boot/scene_menu.c
index fa79cecdbd..154be7f012 100644
--- a/boot/scene_menu.c
+++ b/boot/scene_menu.c
@@ -33,6 +33,51 @@ void scene_menu_destroy(struct scene_obj_menu *menu)
 		scene_menuitem_destroy(item);
 }
 
+static struct scene_menitem *scene_menuitem_find(struct scene_obj_menu *menu,
+						 int id)
+{
+	struct scene_menitem *item;
+
+	list_for_each_entry(item, &menu->item_head, sibling) {
+		if (item->id == id)
+			return item;
+	}
+
+	return NULL;
+}
+
+/**
+ * update_pointers() - Update the pointer object and handle highlights
+ *
+ * @menu: Menu to update
+ * @id: ID of menu item to select/deselect
+ * @point: true if @id is being selected, false if it is being deselected
+ */
+static int update_pointers(struct scene_obj_menu *menu, uint id, bool point)
+{
+	struct scene *scn = menu->obj.scene;
+	const struct scene_menitem *item;
+	int ret;
+
+	item = scene_menuitem_find(menu, id);
+	if (!item)
+		return log_msg_ret("itm", -ENOENT);
+
+	/* adjust the pointer object to point to the selected item */
+	if (menu->pointer_id && item && point) {
+		struct scene_obj *label;
+
+		label = scene_obj_find(scn, item->label_id, SCENEOBJT_NONE);
+
+		ret = scene_obj_set_pos(scn, menu->pointer_id,
+					menu->obj.dim.x + 200, label->dim.y);
+		if (ret < 0)
+			return log_msg_ret("ptr", ret);
+	}
+
+	return 0;
+}
+
 /**
  * menu_point_to_item() - Point to a particular menu item
  *
@@ -40,7 +85,10 @@ void scene_menu_destroy(struct scene_obj_menu *menu)
  */
 static void menu_point_to_item(struct scene_obj_menu *menu, uint item_id)
 {
+	if (menu->cur_item_id)
+		update_pointers(menu, menu->cur_item_id, false);
 	menu->cur_item_id = item_id;
+	update_pointers(menu, item_id, true);
 }
 
 static int scene_bbox_union(struct scene *scn, uint id,
@@ -125,6 +173,7 @@ int scene_menu_calc_dims(struct scene_obj_menu *menu)
 int scene_menu_arrange(struct scene *scn, struct scene_obj_menu *menu)
 {
 	struct scene_menitem *item;
+	uint sel_id;
 	int y, cur_y;
 	int ret;
 
@@ -147,7 +196,7 @@ int scene_menu_arrange(struct scene *scn, struct scene_obj_menu *menu)
 	 * small. This can be updated once text measuring is supported in
 	 * vidconsole
 	 */
-	cur_y = -1;
+	sel_id = menu->cur_item_id;
 	list_for_each_entry(item, &menu->item_head, sibling) {
 		int height;
 
@@ -160,8 +209,8 @@ int scene_menu_arrange(struct scene *scn, struct scene_obj_menu *menu)
 			y += height;
 
 		/* select an item if not done already */
-		if (!menu->cur_item_id)
-			menu_point_to_item(menu, item->id);
+		if (!sel_id)
+			sel_id = item->id;
 
 		/*
 		 * Put the label on the left, then leave a space for the
@@ -207,16 +256,8 @@ int scene_menu_arrange(struct scene *scn, struct scene_obj_menu *menu)
 		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.dim.x + 200, cur_y);
-		if (ret < 0)
-			return log_msg_ret("ptr", ret);
-	}
+	if (sel_id)
+		menu_point_to_item(menu, sel_id);
 
 	return 0;
 }