Centralize click-handling in the LCD loop

Marlin/Marlin.h

 extern bool axis_homed[XYZ]; // axis[n].is_homed
 extern volatile bool wait_for_heatup;
 
-#if ENABLED(ULTIPANEL) || ENABLED(EMERGENCY_PARSER)
+#if ENABLED(EMERGENCY_PARSER) || ENABLED(ULTIPANEL)
   extern volatile bool wait_for_user;
 #endif
 

Marlin/MarlinSerial.cpp

         if (c == '\n') {
           switch (state) {
             case state_M108:
-              wait_for_heatup = false;
-              #if DISABLED(ULTIPANEL)
-                wait_for_user = false;
-              #endif
+              wait_for_user = wait_for_heatup = false;
               break;
             case state_M112:
               kill(PSTR(MSG_KILLED));

Marlin/Marlin_main.cpp

 
       #if DISABLED(EMERGENCY_PARSER)
         // If command was e-stop process now
-        if (strcmp(command, "M108") == 0) wait_for_heatup = false;
+        if (strcmp(command, "M108") == 0) {
+          wait_for_heatup = false;
+          #if ENABLED(ULTIPANEL)
+            wait_for_user = false;
+          #endif
+        }
         if (strcmp(command, "M112") == 0) kill(PSTR(MSG_KILLED));
         if (strcmp(command, "M410") == 0) { quickstop_stepper(); }
       #endif
           dontExpireStatus();
         #endif
       }
-      lcd_ignore_click();
 
     #else
 
 
     #endif
 
-    #if ENABLED(EMERGENCY_PARSER)
-      wait_for_user = true;
-    #endif
-
+    wait_for_user = true;
     KEEPALIVE_STATE(PAUSED_FOR_USER);
 
     stepper.synchronize();
     refresh_cmd_timeout();
 
-    #if ENABLED(ULTIPANEL)
-
-      #if ENABLED(EMERGENCY_PARSER)
-        #define M1_WAIT_CONDITION (!lcd_clicked() && wait_for_user)
+    if (codenum > 0) {
+      codenum += previous_cmd_ms;  // wait until this time for a click
+      while (PENDING(millis(), codenum) && wait_for_user) idle();
+    }
+    else {
+      #if ENABLED(ULTIPANEL)
+        if (lcd_detected()) {
+          while (wait_for_user) idle();
+          IS_SD_PRINTING ? LCD_MESSAGEPGM(MSG_RESUMING) : LCD_MESSAGEPGM(WELCOME_MSG);
+        }
       #else
-        #define M1_WAIT_CONDITION !lcd_clicked()
+        while (wait_for_user) idle();
       #endif
+    }
 
-      if (codenum > 0) {
-        codenum += previous_cmd_ms;  // wait until this time for a click
-        while (PENDING(millis(), codenum) && M1_WAIT_CONDITION) idle();
-        lcd_ignore_click(false);
-      }
-      else if (lcd_detected()) {
-        while (M1_WAIT_CONDITION) idle();
-      }
-      else goto ExitM1;
-
-      IS_SD_PRINTING ? LCD_MESSAGEPGM(MSG_RESUMING) : LCD_MESSAGEPGM(WELCOME_MSG);
-
-    #else
-
-      if (codenum > 0) {
-        codenum += previous_cmd_ms;  // wait until this time for an M108
-        while (PENDING(millis(), codenum) && wait_for_user) idle();
-      }
-      else while (wait_for_user) idle();
-
-    #endif
-
-#if ENABLED(ULTIPANEL)
-  ExitM1:
-#endif
-
-    #if ENABLED(EMERGENCY_PARSER)
-      wait_for_user = false;
-    #endif
-
+    wait_for_user = false;
     KEEPALIVE_STATE(IN_HANDLER);
   }
 
     // Wait for filament insert by user and press button
     lcd_filament_change_show_message(FILAMENT_CHANGE_MESSAGE_INSERT);
 
-    while (!lcd_clicked()) {
+    // LCD click or M108 will clear this
+    wait_for_user = true;
+
+    while (wait_for_user) {
       #if HAS_BUZZER
         millis_t ms = millis();
         if (ms >= next_buzz) {
       #endif
       idle(true);
     }
-    delay(100);
-    while (lcd_clicked()) idle(true);
-    delay(100);
 
     // Show load message
     lcd_filament_change_show_message(FILAMENT_CHANGE_MESSAGE_LOAD);

Marlin/ultralcd.cpp

    *
    * START_MENU    Opening code for a screen with menu items.
    *               Scroll as-needed to keep the selected line in view.
-   *               'wasClicked' indicates the controller was clicked.
    */
   #define START_SCREEN() \
     START_SCREEN_OR_MENU(LCD_HEIGHT); \
     if (encoderLine >= encoderTopLine + LCD_HEIGHT) { \
       encoderTopLine = encoderLine - (LCD_HEIGHT - 1); \
     } \
-    bool wasClicked = LCD_CLICKED; \
     bool _skipStatic = true; \
     SCREEN_OR_MENU_LOOP()
 
     if (_menuLineNr == _thisItemNr) { \
       if (lcdDrawUpdate) \
         lcd_implementation_drawmenu_ ## TYPE(encoderLine == _thisItemNr, _lcdLineNr, PSTR(LABEL), ## __VA_ARGS__); \
-      if (wasClicked && encoderLine == _thisItemNr) { \
-        lcd_quick_feedback()
+      if (lcd_clicked && encoderLine == _thisItemNr) {
 
   #define _MENU_ITEM_PART_2(TYPE, ...) \
         menu_action_ ## TYPE(__VA_ARGS__); \
   menuPosition screen_history[10];
   uint8_t screen_history_depth = 0;
 
-  bool ignore_click = false;
-  bool wait_for_unclick;
-  bool defer_return_to_status = false;
+  // LCD and menu clicks
+  bool lcd_clicked, wait_for_unclick, defer_return_to_status;
 
   // Variables used when editing values.
   const char* editLabel;
   screenFunc_t callbackFunc;              // call this after editing
 
   /**
-   * General function to go directly to a menu
+   * General function to go directly to a screen
    */
-  static void lcd_goto_screen(screenFunc_t screen, const bool feedback = false, const uint32_t encoder = 0) {
+  static void lcd_goto_screen(screenFunc_t screen, const uint32_t encoder = 0) {
     if (currentScreen != screen) {
       currentScreen = screen;
       encoderPosition = encoder;
         defer_return_to_status = false;
         screen_history_depth = 0;
       }
-      if (feedback) lcd_quick_feedback();
       lcd_implementation_clear();
       #if ENABLED(LCD_PROGRESS_BAR)
         // For LCD_PROGRESS_BAR re-initialize custom characters
       --screen_history_depth;
       lcd_goto_screen(
         screen_history[screen_history_depth].menu_function,
-        feedback,
         screen_history[screen_history_depth].encoder_position
       );
     }
       lcd_return_to_status();
   }
 
-  void lcd_ignore_click(bool b) {
-    ignore_click = b;
-    wait_for_unclick = false;
-  }
-
 #endif // ULTIPANEL
 
 /**
 
   #if ENABLED(ULTIPANEL)
 
-    bool current_click = LCD_CLICKED;
-
-    if (ignore_click) {
-      if (wait_for_unclick) {
-        if (!current_click)
-          ignore_click = wait_for_unclick = false;
-        else
-          current_click = false;
-      }
-      else if (current_click) {
-        lcd_quick_feedback();
-        wait_for_unclick = true;
-        current_click = false;
-      }
-    }
-
-    if (current_click) {
+    if (lcd_clicked) {
       #if ENABLED(FILAMENT_LCD_DISPLAY)
         previous_lcd_status_ms = millis();  // get status message to show up for a while
       #endif
           false
         #endif
       );
-      lcd_goto_screen(lcd_main_menu, true);
+      lcd_goto_screen(lcd_main_menu);
     }
 
     #if ENABLED(ULTIPANEL_FEEDMULTIPLY)
     long babysteps_done = 0;
 
     static void _lcd_babystep(const AxisEnum axis, const char* msg) {
-      if (LCD_CLICKED) { defer_return_to_status = false; lcd_goto_previous_menu(true); return; }
+      if (lcd_clicked) { defer_return_to_status = false; return lcd_goto_previous_menu(true); }
       ENCODER_DIRECTION_NORMAL();
       if (encoderPosition) {
         int babystep_increment = (int32_t)encoderPosition * BABYSTEP_MULTIPLICATOR;
       }
 
       static bool debounce_click = false;
-      if (LCD_CLICKED) {
+      if (lcd_clicked) {
         if (!debounce_click) {
           debounce_click = true; // ignore multiple "clicks" in a row
           mbl.set_zigzag_z(_lcd_level_bed_position++, current_position[Z_AXIS]);
           if (_lcd_level_bed_position == (MESH_NUM_X_POINTS) * (MESH_NUM_Y_POINTS)) {
-            lcd_goto_screen(_lcd_level_bed_done, true);
+            lcd_goto_screen(_lcd_level_bed_done);
 
             current_position[Z_AXIS] = MESH_HOME_SEARCH_Z + Z_HOMING_HEIGHT;
             line_to_current(Z_AXIS);
             #endif
           }
           else {
-            lcd_goto_screen(_lcd_level_goto_next_point, true);
+            lcd_goto_screen(_lcd_level_goto_next_point);
           }
         }
       }
      */
     static void _lcd_level_bed_homing_done() {
       if (lcdDrawUpdate) lcd_implementation_drawedit(PSTR(MSG_LEVEL_BED_WAITING));
-      if (LCD_CLICKED) {
+      if (lcd_clicked) {
         _lcd_level_bed_position = 0;
         current_position[Z_AXIS] = MESH_HOME_SEARCH_Z
           #if Z_HOME_DIR > 0
           #endif
         ;
         planner.set_position_mm(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS], current_position[E_AXIS]);
-        lcd_goto_screen(_lcd_level_goto_next_point, true);
+        lcd_goto_screen(_lcd_level_goto_next_point);
       }
     }
 
    */
 
   static void _lcd_move_xyz(const char* name, AxisEnum axis) {
-    if (LCD_CLICKED) { lcd_goto_previous_menu(true); return; }
+    if (lcd_clicked) { return lcd_goto_previous_menu(true); }
     ENCODER_DIRECTION_NORMAL();
     if (encoderPosition) {
       refresh_cmd_timeout();
       int8_t eindex=-1
     #endif
   ) {
-    if (LCD_CLICKED) { lcd_goto_previous_menu(true); return; }
+    if (lcd_clicked) { return lcd_goto_previous_menu(true); }
     ENCODER_DIRECTION_NORMAL();
     if (encoderPosition) {
       current_position[E_AXIS] += float((int32_t)encoderPosition) * move_menu_scale;
    */
   #if HAS_LCD_CONTRAST
     static void lcd_set_contrast() {
-      if (LCD_CLICKED) { lcd_goto_previous_menu(true); return; }
+      if (lcd_clicked) { return lcd_goto_previous_menu(true); }
       ENCODER_DIRECTION_NORMAL();
       if (encoderPosition) {
         set_lcd_contrast(lcd_contrast + encoderPosition);
      */
     void lcd_sdcard_menu() {
       ENCODER_DIRECTION_MENUS();
-      if (lcdDrawUpdate == 0 && LCD_CLICKED == 0) return; // nothing to do (so don't thrash the SD card)
+      if (!lcdDrawUpdate && !lcd_clicked) return; // nothing to do (so don't thrash the SD card)
       uint16_t fileCnt = card.getnrfilenames();
       START_MENU();
       MENU_BACK(MSG_MAIN);
        *
        */
       static void lcd_info_stats_menu() {
-        if (LCD_CLICKED) { lcd_goto_previous_menu(true); return; }
+        if (lcd_clicked) { return lcd_goto_previous_menu(true); }
 
         char buffer[21];
         printStatistics stats = print_job_timer.getStats();
      *
      */
     static void lcd_info_thermistors_menu() {
-      if (LCD_CLICKED) { lcd_goto_previous_menu(true); return; }
+      if (lcd_clicked) { return lcd_goto_previous_menu(true); }
       START_SCREEN();
       #define THERMISTOR_ID TEMP_SENSOR_0
       #include "thermistornames.h"
      *
      */
     static void lcd_info_board_menu() {
-      if (LCD_CLICKED) { lcd_goto_previous_menu(true); return; }
+      if (lcd_clicked) { return lcd_goto_previous_menu(true); }
       START_SCREEN();
       STATIC_ITEM(BOARD_NAME, true, true);                           // MyPrinterController
       STATIC_ITEM(MSG_INFO_BAUDRATE ": " STRINGIFY(BAUDRATE), true); // Baud: 250000
      *
      */
     static void lcd_info_printer_menu() {
-      if (LCD_CLICKED) { lcd_goto_previous_menu(true); return; }
+      if (lcd_clicked) { return lcd_goto_previous_menu(true); }
       START_SCREEN();
       STATIC_ITEM(MSG_MARLIN, true, true);                             // Marlin
       STATIC_ITEM(SHORT_BUILD_VERSION, true);                          // x.x.x-Branch
   #define menu_edit_type(_type, _name, _strFunc, scale) \
     bool _menu_edit_ ## _name () { \
       ENCODER_DIRECTION_NORMAL(); \
-      bool isClicked = LCD_CLICKED; \
       if ((int32_t)encoderPosition < 0) encoderPosition = 0; \
       if ((int32_t)encoderPosition > maxEditValue) encoderPosition = maxEditValue; \
       if (lcdDrawUpdate) \
         lcd_implementation_drawedit(editLabel, _strFunc(((_type)((int32_t)encoderPosition + minEditValue)) / scale)); \
-      if (isClicked) { \
+      if (lcd_clicked) { \
         *((_type*)editValue) = ((_type)((int32_t)encoderPosition + minEditValue)) / scale; \
         lcd_goto_previous_menu(true); \
       } \
-      return isClicked; \
+      return lcd_clicked; \
     } \
     void menu_edit_ ## _name () { _menu_edit_ ## _name(); } \
     void menu_edit_callback_ ## _name () { if (_menu_edit_ ## _name ()) (*callbackFunc)(); } \
   #if ENABLED(ULTIPANEL)
     static millis_t return_to_status_ms = 0;
     manage_manual_move();
-  #endif
 
-  lcd_buttons_update();
+    lcd_buttons_update();
+
+    // If the action button is pressed...
+    if (LCD_CLICKED) {
+      if (!wait_for_unclick) {           // If not waiting for a debounce release:
+        wait_for_unclick = true;         //  Set debounce flag to ignore continous clicks
+        lcd_clicked = !wait_for_user;    //  Keep the click if not waiting for a user-click
+        wait_for_user = false;           //  Any click clears wait for user
+        lcd_quick_feedback();            //  Always make a click sound
+      }
+    }
+    else wait_for_unclick = false;
+  #endif
 
   #if ENABLED(SDSUPPORT) && PIN_EXISTS(SD_DETECT)
 
       #endif // REPRAPWORLD_KEYPAD
 
       bool encoderPastThreshold = (abs(encoderDiff) >= ENCODER_PULSES_PER_STEP);
-      if (encoderPastThreshold || LCD_CLICKED) {
+      if (encoderPastThreshold || lcd_clicked) {
         if (encoderPastThreshold) {
           int32_t encoderMultiplier = 1;
 
       }
 
       #if ENABLED(ULTIPANEL)
-        #define CURRENTSCREEN() (*currentScreen)()
+        #define CURRENTSCREEN() (*currentScreen)(), lcd_clicked = false
       #else
         #define CURRENTSCREEN() lcd_status_screen()
       #endif
     #endif
   }
 
-  bool lcd_clicked() { return LCD_CLICKED; }
-
 #endif // ULTIPANEL
 
 #endif // ULTRA_LCD

Marlin/ultralcd.h

     extern volatile uint8_t buttons;  //the last checked buttons in a bit array.
     void lcd_buttons_update();
     void lcd_quick_feedback(); // Audible feedback for a button click - could also be visual
-    bool lcd_clicked();
-    void lcd_ignore_click(bool b=true);
 
     #if ENABLED(FILAMENT_CHANGE_FEATURE)
       void lcd_filament_change_show_message(FilamentChangeMessage message);
     FORCE_INLINE void lcd_buttons_update() {}
   #endif
 
-  extern int preheatHotendTemp1;
-  extern int preheatBedTemp1;
-  extern int preheatFanSpeed1;
-  extern int preheatHotendTemp2;
-  extern int preheatBedTemp2;
-  extern int preheatFanSpeed2;
+  extern int preheatHotendTemp1,
+             preheatBedTemp1,
+             preheatFanSpeed1,
+             preheatHotendTemp2,
+             preheatBedTemp2,
+             preheatFanSpeed2;
 
   #if ENABLED(FILAMENT_LCD_DISPLAY)
     extern millis_t previous_lcd_status_ms;
     #define LCD_CLICKED ((buttons & EN_C) || (buttons_reprapworld_keypad & EN_REPRAPWORLD_KEYPAD_F1))
   #elif ENABLED(NEWPANEL)
     #define LCD_CLICKED (buttons & EN_C)
+  #else
+    #define LCD_CLICKED false
   #endif
 
 #else //no LCD