feat: add config set LV_WIDGETS_HAS_DEAFULT_VALUE (#4371)

Signed-off-by: yushuailong1 <yushuailong1@xiaomi.com>
Co-authored-by: yushuailong1 <yushuailong1@xiaomi.com>

Kconfig

@@ -775,6 +775,9 @@ menu "LVGL configuration"
 	endmenu
 
 	menu "Widget usage"
+		config LV_WIDGETS_HAS_DEFAULT_VALUE
+			bool "Widgets has default value."
+			default y if !LV_CONF_MINIMAL
 		config LV_USE_ARC
 			bool "Arc."
 			default y if !LV_CONF_MINIMAL

lv_conf_template.h

@@ -409,6 +409,8 @@
 
 /*Documentation of the widgets: https://docs.lvgl.io/latest/en/html/widgets/index.html*/
 
+#define LV_WIDGETS_HAS_DEFAULT_VALUE  1
+
 #define LV_USE_ANIMIMG    1
 
 #define LV_USE_ARC        1

src/lv_conf_internal.h

@@ -1167,6 +1167,18 @@
 
 /*Documentation of the widgets: https://docs.lvgl.io/latest/en/html/widgets/index.html*/
 
+#ifndef LV_WIDGETS_HAS_DEFAULT_VALUE
+    #ifdef _LV_KCONFIG_PRESENT
+        #ifdef CONFIG_LV_WIDGETS_HAS_DEFAULT_VALUE
+            #define LV_WIDGETS_HAS_DEFAULT_VALUE CONFIG_LV_WIDGETS_HAS_DEFAULT_VALUE
+        #else
+            #define LV_WIDGETS_HAS_DEFAULT_VALUE 0
+        #endif
+    #else
+        #define LV_WIDGETS_HAS_DEFAULT_VALUE  1
+    #endif
+#endif
+
 #ifndef LV_USE_ANIMIMG
     #ifdef _LV_KCONFIG_PRESENT
         #ifdef CONFIG_LV_USE_ANIMIMG

src/widgets/btnmatrix/lv_btnmatrix.c

@@ -57,7 +57,9 @@ static bool has_popovers_in_top_row(lv_obj_t * obj);
 /**********************
  *  STATIC VARIABLES
  **********************/
+#if LV_WIDGETS_HAS_DEFAULT_VALUE
 static const char * lv_btnmatrix_def_map[] = {"Btn1", "Btn2", "Btn3", "\n", "Btn4", "Btn5", ""};
+#endif
 
 const lv_obj_class_t lv_btnmatrix_class = {
     .constructor_cb = lv_btnmatrix_constructor,
@@ -367,7 +369,9 @@ static void lv_btnmatrix_constructor(const lv_obj_class_t * class_p, lv_obj_t *
     btnm->map_p          = NULL;
     btnm->one_check      = 0;
 
+#if LV_WIDGETS_HAS_DEFAULT_VALUE
     lv_btnmatrix_set_map(obj, lv_btnmatrix_def_map);
+#endif
 
     LV_TRACE_OBJ_CREATE("finished");
 }

src/widgets/calendar/lv_calendar.c

@@ -243,6 +243,8 @@ static void lv_calendar_constructor(const lv_obj_class_t * class_p, lv_obj_t * o
     lv_calendar_t * calendar = (lv_calendar_t *)obj;
 
     /*Initialize the allocated 'ext'*/
+
+#if LV_WIDGETS_HAS_DEFAULT_VALUE
     calendar->today.year  = 2020;
     calendar->today.month = 1;
     calendar->today.day   = 1;
@@ -250,6 +252,7 @@ static void lv_calendar_constructor(const lv_obj_class_t * class_p, lv_obj_t * o
     calendar->showed_date.year  = 2020;
     calendar->showed_date.month = 1;
     calendar->showed_date.day   = 1;
+#endif
 
     calendar->highlighted_dates      = NULL;
     calendar->highlighted_dates_num  = 0;
@@ -282,8 +285,10 @@ 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
 
     lv_obj_add_flag(calendar->btnm, LV_OBJ_FLAG_EVENT_BUBBLE);
 }

src/widgets/checkbox/lv_checkbox.c

@@ -132,8 +132,14 @@ static void lv_checkbox_constructor(const lv_obj_class_t * class_p, lv_obj_t * o
 
     lv_checkbox_t * cb = (lv_checkbox_t *)obj;
 
+#if LV_WIDGETS_HAS_DEFAULT_VALUE
     cb->txt = (char *)"Check box";
     cb->static_txt = 1;
+#else
+    cb->txt = (char *)"";
+    cb->static_txt = 1;
+#endif
+
     lv_obj_add_flag(obj, LV_OBJ_FLAG_CLICKABLE);
     lv_obj_add_flag(obj, LV_OBJ_FLAG_CHECKABLE);
     lv_obj_add_flag(obj, LV_OBJ_FLAG_SCROLL_ON_FOCUS);

src/widgets/dropdown/lv_dropdown.c

@@ -598,7 +598,9 @@ static void lv_dropdown_constructor(const lv_obj_class_t * class_p, lv_obj_t * o
     dropdown->dir = LV_DIR_BOTTOM;
 
     lv_obj_add_flag(obj, LV_OBJ_FLAG_SCROLL_ON_FOCUS);
+#if LV_WIDGETS_HAS_DEFAULT_VALUE
     lv_dropdown_set_options_static(obj, "Option 1\nOption 2\nOption 3");
+#endif
 
     dropdown->list = lv_dropdown_list_create(lv_obj_get_screen(obj));
     lv_dropdown_list_t * list = (lv_dropdown_list_t *)dropdown->list;

src/widgets/label/lv_label.c

@@ -663,7 +663,6 @@ static void lv_label_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
     lv_label_set_long_mode(obj, LV_LABEL_LONG_WRAP);
     lv_label_set_text(obj, LV_LABEL_DEFAULT_TEXT);
 
-
     LV_TRACE_OBJ_CREATE("finished");
 }
 

src/widgets/label/lv_label.h

@@ -31,7 +31,11 @@ extern "C" {
 #define LV_LABEL_DOT_NUM 3
 #define LV_LABEL_POS_LAST 0xFFFF
 #define LV_LABEL_TEXT_SELECTION_OFF LV_DRAW_LABEL_NO_TXT_SEL
+#if LV_WIDGETS_HAS_DEFAULT_VALUE
 #define LV_LABEL_DEFAULT_TEXT "Text"
+#else
+#define LV_LABEL_DEFAULT_TEXT ""
+#endif
 
 LV_EXPORT_CONST_INT(LV_LABEL_DOT_NUM);
 LV_EXPORT_CONST_INT(LV_LABEL_POS_LAST);

src/widgets/roller/lv_roller.c

@@ -317,8 +317,9 @@ static void lv_roller_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj
     LV_LOG_INFO("begin");
     lv_obj_t * label = lv_obj_class_create_obj(&lv_roller_label_class, obj);
     lv_obj_class_init_obj(label);
+#if LV_WIDGETS_HAS_DEFAULT_VALUE
     lv_roller_set_options(obj, "Option 1\nOption 2\nOption 3\nOption 4\nOption 5", LV_ROLLER_MODE_NORMAL);
-
+#endif
     LV_LOG_TRACE("finshed");
 }
 

src/widgets/textarea/lv_textarea.c

@@ -848,6 +848,7 @@ static void lv_textarea_constructor(const lv_obj_class_t * class_p, lv_obj_t * o
     lv_obj_add_event(ta->label, label_event_cb, LV_EVENT_ALL, NULL);
     lv_obj_add_flag(obj, LV_OBJ_FLAG_SCROLL_ON_FOCUS);
     lv_obj_clear_flag(obj, LV_OBJ_FLAG_SCROLL_WITH_ARROW);
+
     lv_textarea_set_cursor_pos(obj, 0);
 
     start_cursor_blink(obj);