Merge pull request #1061 from joltwallet/count_children_recursive

lv_obj_count_children_recursive

src/lv_core/lv_obj.c

@@ -203,6 +203,7 @@ lv_obj_t * lv_obj_create(lv_obj_t * parent, const lv_obj_t * copy)
         new_obj->opa_scale_en = 0;
         new_obj->opa_scale    = LV_OPA_COVER;
         new_obj->parent_event = 0;
+        new_obj->reserved     = 0;
 
         new_obj->ext_attr = NULL;
 
@@ -1561,6 +1562,22 @@ uint16_t lv_obj_count_children(const lv_obj_t * obj)
     return cnt;
 }
 
+/** Recursively count the children of an object
+ * @param obj pointer to an object
+ * @return children number of 'obj'
+ */
+uint16_t lv_obj_count_children_recursive(const lv_obj_t * obj){
+    lv_obj_t * i;
+    uint16_t cnt = 0;
+
+    LV_LL_READ(obj->child_ll, i) {
+        cnt++; // Count the child
+        cnt += lv_obj_count_children_recursive(i); // recursively count children's children
+    }
+
+    return cnt;
+}
+
 /*---------------------
  * Coordinate get
  *--------------------*/

src/lv_core/lv_obj.h

@@ -661,6 +661,12 @@ lv_obj_t * lv_obj_get_child_back(const lv_obj_t * obj, const lv_obj_t * child);
  */
 uint16_t lv_obj_count_children(const lv_obj_t * obj);
 
+/** Recursively count the children of an object
+ * @param obj pointer to an object
+ * @return children number of 'obj'
+ */
+uint16_t lv_obj_count_children_recursive(const lv_obj_t * obj);
+
 /*---------------------
  * Coordinate get
  *--------------------*/

src/lv_misc/lv_ll.c

@@ -318,6 +318,22 @@ void * lv_ll_get_prev(const lv_ll_t * ll_p, const void * n_act)
     return prev;
 }
 
+/**
+ * Return the length of the linked list.
+ * @param ll_p pointer to linked list
+ * @return length of the linked list
+ */
+uint32_t lv_ll_get_len(const lv_ll_t *ll_p){
+    uint32_t len = 0;
+    void * node;
+
+    for(node=lv_ll_get_head(ll_p); node!=NULL; node=lv_ll_get_next(ll_p, node)) {
+        len++;
+    }
+
+    return len;
+}
+
 void lv_ll_swap(lv_ll_t * ll_p, void * n1_p, void * n2_p)
 {
     (void)(ll_p);

src/lv_misc/lv_ll.h

@@ -124,6 +124,13 @@ void * lv_ll_get_next(const lv_ll_t * ll_p, const void * n_act);
  */
 void * lv_ll_get_prev(const lv_ll_t * ll_p, const void * n_act);
 
+/**
+ * Return the length of the linked list.
+ * @param ll_p pointer to linked list
+ * @return length of the linked list
+ */
+uint32_t lv_ll_get_len(const lv_ll_t *ll_p);
+
 /**
  * Move a nodw before an other node in the same linked list
  * @param ll_p pointer to a linked list