feat(textarea): static and non-static setter for accepted_chars

docs/src/widgets/textarea.rst

@@ -143,7 +143,8 @@ Accepted characters
 -------------------
 
 You can set a list of accepted characters with
-:cpp:expr:`lv_textarea_set_accepted_chars(textarea, list)` where ``list`` is a
+:cpp:expr:`lv_textarea_set_accepted_chars(textarea, list)` or
+:cpp:expr:`lv_textarea_set_accepted_chars_static(textarea, list)` where ``list`` is a
 pointer to a NUL-terminated string, or NULL to accept all characters.  Characters
 entered not in this list will be ignored.
 

src/widgets/textarea/lv_textarea.c

@@ -559,9 +559,29 @@ void lv_textarea_set_accepted_chars(lv_obj_t * obj, const char * list)
 
     lv_textarea_t * ta = (lv_textarea_t *)obj;
 
-    ta->accepted_chars = list;
+    char * copied_list = NULL;
+    if(list) {
+        copied_list = lv_strdup(list);
+        LV_ASSERT_MALLOC(copied_list);
+    }
+
+    if(!ta->static_accepted_chars) lv_free(ta->accepted_chars);
+    ta->static_accepted_chars = 0;
+    ta->accepted_chars = copied_list;
 }
 
+void lv_textarea_set_accepted_chars_static(lv_obj_t * obj, const char * list)
+{
+    LV_ASSERT_OBJ(obj, MY_CLASS);
+
+    lv_textarea_t * ta = (lv_textarea_t *)obj;
+
+    if(!ta->static_accepted_chars) lv_free(ta->accepted_chars);
+    ta->static_accepted_chars = 1;
+    ta->accepted_chars = (char *)list;
+}
+
+
 void lv_textarea_set_max_length(lv_obj_t * obj, uint32_t num)
 {
     LV_ASSERT_OBJ(obj, MY_CLASS);
@@ -893,6 +913,7 @@ static void lv_textarea_constructor(const lv_obj_class_t * class_p, lv_obj_t * o
     ta->pwd_bullet        = NULL;
     ta->pwd_show_time     = LV_TEXTAREA_DEF_PWD_SHOW_TIME;
     ta->accepted_chars    = NULL;
+    ta->static_accepted_chars = 1;
     ta->max_length        = 0;
     ta->cursor.show      = 1;
     /*It will be set to zero later (with zero value lv_textarea_set_cursor_pos(obj, 0); wouldn't do anything as there is no difference)*/
@@ -938,6 +959,8 @@ static void lv_textarea_destructor(const lv_obj_class_t * class_p, lv_obj_t * ob
         lv_free(ta->placeholder_txt);
         ta->placeholder_txt = NULL;
     }
+    if(!ta->static_accepted_chars) lv_free(ta->accepted_chars);
+    ta->accepted_chars = NULL;
 }
 
 static void lv_textarea_event(const lv_obj_class_t * class_p, lv_event_t * e)

src/widgets/textarea/lv_textarea.h

@@ -158,10 +158,17 @@ void lv_textarea_set_one_line(lv_obj_t * obj, bool en);
 /**
  * Set a list of characters. Only these characters will be accepted by the text area
  * @param obj       pointer to a text area object
- * @param list      list of characters. Only the pointer is saved. E.g. "+-.,0123456789"
+ * @param list      list of characters. A copy is saved. Example: "+-.,0123456789"
  */
 void lv_textarea_set_accepted_chars(lv_obj_t * obj, const char * list);
 
+/**
+ * Set a list of characters. Only these characters will be accepted by the text area
+ * @param obj       pointer to a text area object
+ * @param list      list of characters. Only the pointer is saved. Example: "+-.,0123456789"
+ */
+void lv_textarea_set_accepted_chars_static(lv_obj_t * obj, const char * list);
+
 /**
  * Set max length of a Text Area.
  * @param obj       pointer to a text area object

src/widgets/textarea/lv_textarea_private.h

@@ -34,7 +34,7 @@ struct _lv_textarea_t {
     char * placeholder_txt;      /**< Place holder label. only visible if text is an empty string */
     char * pwd_tmp;              /**< Used to store the original text in password mode */
     char * pwd_bullet;           /**< Replacement characters displayed in password mode */
-    const char * accepted_chars; /**< Only these characters will be accepted. NULL: accept all */
+    char * accepted_chars;       /**< Only these characters will be accepted. NULL: accept all */
     uint32_t max_length;         /**< The max. number of characters. 0: no limit */
     uint32_t pwd_show_time;      /**< Time to show characters in password mode before change them to '*' */
     struct {
@@ -55,6 +55,7 @@ struct _lv_textarea_t {
 #endif
     uint8_t pwd_mode : 1;         /**< Replace characters with '*' */
     uint8_t one_line : 1;         /**< One line mode (ignore line breaks) */
+    uint8_t static_accepted_chars : 1; /**<1: Only a pointer is saved in `accepted_chars` */
 };