fix(calendar): fix crash when no default is set (#5621)

src/widgets/calendar/lv_calendar.c

@@ -245,15 +245,13 @@ static void lv_calendar_constructor(const lv_obj_class_t * class_p, lv_obj_t * o
 
     /*Initialize the allocated 'ext'*/
 
-#if LV_WIDGETS_HAS_DEFAULT_VALUE
+    calendar->today.year  = 2024;
-    calendar->today.year  = 2020;
     calendar->today.month = 1;
     calendar->today.day   = 1;
 
-    calendar->showed_date.year  = 2020;
+    calendar->showed_date.year  = 2024;
     calendar->showed_date.month = 1;
     calendar->showed_date.day   = 1;
-#endif
 
     calendar->highlighted_dates      = NULL;
     calendar->highlighted_dates_num  = 0;
@@ -287,11 +285,8 @@ static void lv_calendar_constructor(const lv_obj_class_t * class_p, lv_obj_t * o
     lv_obj_set_flex_flow(obj, LV_FLEX_FLOW_COLUMN);
     lv_obj_set_flex_grow(calendar->btnm, 1);
 
-#if LV_WIDGETS_HAS_DEFAULT_VALUE
     lv_calendar_set_showed_date(obj, calendar->showed_date.year, calendar->showed_date.month);
     lv_calendar_set_today_date(obj, calendar->today.year, calendar->today.month, calendar->today.day);
-#endif
-
 }
 
 static void draw_task_added_event_cb(lv_event_t * e)

src/widgets/calendar/lv_calendar_header_arrow.c

@@ -13,6 +13,7 @@
 #include "../button/lv_button.h"
 #include "../label/lv_label.h"
 #include "../../layouts/flex/lv_flex.h"
+#include "../../misc/lv_assert.h"
 
 /*********************
  *      DEFINES
@@ -111,6 +112,9 @@ static void month_event_cb(lv_event_t * e)
     d = lv_calendar_get_showed_date(calendar);
     lv_calendar_date_t newd = *d;
 
+    LV_ASSERT_FORMAT_MSG(newd.year >= 0 && newd.month >= 1 && newd.month <= 12,
+                         "Invalid date: %d-%d", newd.year, newd.month);
+
     /*The last child is the right button*/
     if(lv_obj_get_child(header, 0) == btn) {
         if(newd.month == 1) {
@@ -142,9 +146,12 @@ static void value_changed_event_cb(lv_event_t * e)
     lv_obj_t * header = lv_event_get_current_target(e);
     lv_obj_t * calendar = lv_obj_get_parent(header);
 
-    const lv_calendar_date_t * cur_date = lv_calendar_get_showed_date(calendar);
+    const lv_calendar_date_t * date = lv_calendar_get_showed_date(calendar);
+    LV_ASSERT_FORMAT_MSG(date->year >= 0 && date->month >= 1 && date->month <= 12,
+                         "Invalid date: %d-%d", date->year, date->month);
+
     lv_obj_t * label = lv_obj_get_child(header, 1);
-    lv_label_set_text_fmt(label, "%d %s", cur_date->year, month_names_def[cur_date->month - 1]);
+    lv_label_set_text_fmt(label, "%d %s", date->year, month_names_def[date->month - 1]);
 }
 
 #endif /*LV_USE_CALENDAR_HEADER_ARROW*/