Custom menu items confirm option (#21338)

Co-authored-by: Scott Lahteine <github@thinkyhead.com>

Marlin/Configuration_adv.h

@@ -3456,21 +3456,27 @@
   #define USER_SCRIPT_DONE "M117 User Script Done"
   #define USER_SCRIPT_AUDIBLE_FEEDBACK
   //#define USER_SCRIPT_RETURN    // Return to status screen after a script
+  #define CUSTOM_MENU_ONLY_IDLE   // Only show custom menu when the machine is idle
 
   #define USER_DESC_1 "Home & UBL Info"
   #define USER_GCODE_1 "G28\nG29W"
+  //#define USER_CONFIRM_1        // Show a confirmation dialog before this action
 
   #define USER_DESC_2 "Preheat for " PREHEAT_1_LABEL
   #define USER_GCODE_2 "M140 S" STRINGIFY(PREHEAT_1_TEMP_BED) "\nM104 S" STRINGIFY(PREHEAT_1_TEMP_HOTEND)
+  //#define USER_CONFIRM_2
 
   #define USER_DESC_3 "Preheat for " PREHEAT_2_LABEL
   #define USER_GCODE_3 "M140 S" STRINGIFY(PREHEAT_2_TEMP_BED) "\nM104 S" STRINGIFY(PREHEAT_2_TEMP_HOTEND)
+  //#define USER_CONFIRM_3
 
   #define USER_DESC_4 "Heat Bed/Home/Level"
   #define USER_GCODE_4 "M140 S" STRINGIFY(PREHEAT_2_TEMP_BED) "\nG28\nG29"
+  //#define USER_CONFIRM_4
 
   #define USER_DESC_5 "Home & Info"
   #define USER_GCODE_5 "G28\nM503"
+  //#define USER_CONFIRM_5
 #endif
 
 /**

Marlin/src/lcd/menu/menu_custom.cpp

@@ -46,7 +46,20 @@ void _lcd_user_gcode(PGM_P const cmd) {
 void menu_user() {
   START_MENU();
   BACK_ITEM(MSG_MAIN);
-  #define USER_ITEM(N) ACTION_ITEM_P(PSTR(USER_DESC_##N), []{ _lcd_user_gcode(PSTR(USER_GCODE_##N _DONE_SCRIPT)); });
+
+  #define GCODE_LAMBDA(N) []{ _lcd_user_gcode(PSTR(USER_GCODE_##N _DONE_SCRIPT)); }
+  #define _USER_ITEM(N) ACTION_ITEM_P(PSTR(USER_DESC_##N), GCODE_LAMBDA(N));
+  #define _USER_ITEM_CONFIRM(N)           \
+    SUBMENU_P(PSTR(USER_DESC_##N), []{    \
+        MenuItem_confirm::confirm_screen( \
+          GCODE_LAMBDA(N),                \
+          ui.goto_previous_screen,        \
+          PSTR(USER_DESC_##N "?")         \
+        );                                \
+      })
+
+  #define USER_ITEM(N) do{ if (ENABLED(USER_CONFIRM_##N)) _USER_ITEM_CONFIRM(N); else _USER_ITEM(N); }while(0)
+
   #if HAS_USER_ITEM(1)
     USER_ITEM(1);
   #endif

Marlin/src/lcd/menu/menu_main.cpp

@@ -211,11 +211,13 @@ void menu_main() {
   SUBMENU(MSG_CONFIGURATION, menu_configuration);
 
   #if ENABLED(CUSTOM_USER_MENUS)
+    if (TERN1(CUSTOM_MENU_ONLY_IDLE, !busy)) {
       #ifdef CUSTOM_USER_MENU_TITLE
         SUBMENU_P(PSTR(CUSTOM_USER_MENU_TITLE), menu_user);
       #else
         SUBMENU(MSG_USER_MENU, menu_user);
       #endif
+    }
   #endif
 
   #if ENABLED(ADVANCED_PAUSE_FEATURE)