fix(disp): should clean up event_cb when deleting lv_disp and lv_obj (#4550)

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

src/core/lv_obj_tree.c

@@ -385,10 +385,7 @@ static void obj_del_core(lv_obj_t * obj)
     }
 
     /*Clean registered event_cb*/
-    uint32_t event_cnt = lv_obj_get_event_count(obj);
-    for(uint32_t i = 0; i < event_cnt; i++) {
-        lv_obj_remove_event(obj, i);
-    }
+    if(obj->spec_attr) lv_event_remove_all(&(obj->spec_attr->event_list));
 
     /*Recursively delete the children*/
     lv_obj_t * child = lv_obj_get_child(obj, 0);

src/disp/lv_disp.c

@@ -138,6 +138,7 @@ void lv_disp_remove(lv_disp_t * disp)
     if(disp == lv_disp_get_default()) was_default = true;
 
     lv_disp_send_event(disp, LV_EVENT_DELETE, NULL);
+    lv_event_remove_all(&(disp->event_list));
 
     /*Detach the input devices*/
     lv_indev_t * indev;

src/misc/lv_event.c

@@ -140,6 +140,16 @@ bool lv_event_remove(lv_event_list_t * list, uint32_t index)
     return true;
 }
 
+void lv_event_remove_all(lv_event_list_t * list)
+{
+    LV_ASSERT_NULL(list);
+    if(list && list->dsc) {
+        lv_free(list->dsc);
+        list->dsc = NULL;
+        list->cnt = 0;
+    }
+}
+
 void * lv_event_get_current_target(lv_event_t * e)
 {
     return e->current_target;

src/misc/lv_event.h

@@ -163,6 +163,8 @@ void * lv_event_dsc_get_user_data(lv_event_dsc_t * dsc);
 
 bool lv_event_remove(lv_event_list_t * list, uint32_t index);
 
+void lv_event_remove_all(lv_event_list_t * list);
+
 /**
  * Get the object originally targeted by the event. It's the same even if the event is bubbled.
  * @param e     pointer to the event descriptor