Add menu, TODO: add hold key events to quickly change value in menu setters

F3:F303/NitrogenFlooding/menu.h

@@ -0,0 +1,40 @@
+/*
+ * This file is part of the nitrogen project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+struct _menu_;
+typedef struct{
+    const char *text;                   // name of menu item
+    struct _menu_ *submenu;             // submenu if selected
+    void (*action)(struct _menu_ *top); // action when item selected (be carefull when both `submenu` and `action` !=NULL), top - parent menu
+} menuitem;
+
+typedef struct _menu_{
+    struct _menu_ *parent;  // parent menu (when `ESC` pressed) or NULL if should return to main window
+    int nitems;             // amount of `menuitem`
+    int selected;           // selected item
+    menuitem *items;        // array of `menuitem` - menu itself
+} menu;
+
+extern menu mainmenu;
+
+// subwindow handler
+typedef void (*window_handler)(uint8_t evtmask);