Remaining Time for Prusa-style LCD layout (#20148)

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

Marlin/src/lcd/HD44780/marlinui_HD44780.cpp

@@ -707,6 +707,35 @@ void MarlinUI::draw_status_message(const bool blink) {
  *  |01234567890123456789|
  */
 
+inline uint8_t draw_elapsed_or_remaining_time(uint8_t timepos) {
+  char buffer[14];
+
+  #if ENABLED(SHOW_REMAINING_TIME)
+    const bool show_remain = TERN1(ROTATE_PROGRESS_DISPLAY, blink) && (printingIsActive() || marlin_state == MF_SD_COMPLETE);
+    if (show_remain) {
+      #if ENABLED(USE_M73_REMAINING_TIME)
+        duration_t remaining = get_remaining_time();
+      #else
+        uint8_t progress = get_progress_percent();
+        uint32_t elapsed = print_job_timer.duration();
+        duration_t remaining = (progress > 0) ? ((elapsed * 25600 / progress) >> 8) - elapsed : 0;
+      #endif
+      timepos -= remaining.toDigital(buffer);
+      lcd_put_wchar(timepos, 2, 'R');
+    }
+  #else
+    constexpr bool show_remain = false;
+  #endif
+
+  if (!show_remain) {
+    duration_t elapsed = print_job_timer.duration();
+    timepos -= elapsed.toDigital(buffer);
+    lcd_put_wchar(timepos, 2, LCD_STR_CLOCK[0]);
+  }
+  lcd_put_u8str(buffer);
+  return timepos;
+}
+
 void MarlinUI::draw_status_screen() {
 
   const bool blink = get_blink();
@@ -845,33 +874,7 @@ void MarlinUI::draw_status_screen() {
       lcd_put_u8str(i16tostr3rj(feedrate_percentage));
       lcd_put_wchar('%');
 
-      char buffer[14];
-      uint8_t timepos = 0;
-      #if ENABLED(SHOW_REMAINING_TIME)
-        const bool show_remain = TERN1(ROTATE_PROGRESS_DISPLAY, blink) && (printingIsActive() || marlin_state == MF_SD_COMPLETE);
-        if (show_remain) {
-          #if ENABLED(USE_M73_REMAINING_TIME)
-            duration_t remaining = get_remaining_time();
-          #else
-            uint8_t progress = get_progress_percent();
-            uint32_t elapsed = print_job_timer.duration();
-            duration_t remaining = (progress > 0) ? ((elapsed * 25600 / progress) >> 8) - elapsed : 0;
-          #endif
-          const uint8_t len = remaining.toDigital(buffer);
-          timepos = LCD_WIDTH - 1 - len;
-          lcd_put_wchar(timepos, 2, 'R');
-        }
-      #else
-        constexpr bool show_remain = false;
-      #endif
-
-      if (!show_remain) {
-        duration_t elapsed = print_job_timer.duration();
-        const uint8_t len = elapsed.toDigital(buffer);
-        timepos = LCD_WIDTH - 1 - len;
-        lcd_put_wchar(timepos, 2, LCD_STR_CLOCK[0]);
-      }
-      lcd_put_u8str(buffer);
+      const uint8_t timepos = draw_elapsed_or_remaining_time(LCD_WIDTH - 1);
 
       #if LCD_WIDTH >= 20
         lcd_moveto(timepos - 7, 2);
@@ -955,7 +958,7 @@ void MarlinUI::draw_status_screen() {
     #elif HAS_MULTI_HOTEND && HAS_HEATED_BED
       _draw_bed_status(blink);
     #elif HAS_PRINT_PROGRESS
-      #define DREW_PRINT_PROGRESS
+      #define DREW_PRINT_PROGRESS 1
       _draw_print_progress();
     #endif
 
@@ -963,14 +966,15 @@ void MarlinUI::draw_status_screen() {
     // Elapsed Time or SD Percent
     //
     lcd_moveto(LCD_WIDTH - 9, 2);
-    #if HAS_PRINT_PROGRESS && !defined(DREW_PRINT_PROGRESS)
+
+    #if HAS_PRINT_PROGRESS && !DREW_PRINT_PROGRESS
+
       _draw_print_progress();
+
     #else
-      duration_t elapsed = print_job_timer.duration();
-      char buffer[14];
-      (void)elapsed.toDigital(buffer);
-      lcd_put_wchar(LCD_STR_CLOCK[0]);
-      lcd_put_u8str(buffer);
+
+      (void)draw_elapsed_or_remaining_time(LCD_WIDTH - 4);
+
     #endif
 
   #endif // LCD_INFO_SCREEN_STYLE 1