add events.reset

doc/en/scripting/events.md

@@ -145,6 +145,12 @@ events.on(code: str, handler: function)
 
 Adds an event handler by its code, not limited to the standard ones.
 
+```lua
+events.reset(code: str, [optional] handler: function)
+```
+
+Removes the event, adding a handler if specified.
+
 ```lua
 events.emit(code: str, args...) -> bool
 ```

doc/ru/scripting/events.md

@@ -144,6 +144,12 @@ events.on(code: str, handler: function)
 
 Добавляет обработчик события по его коду, не ограничиваясь стандартными.
 
+```lua
+events.reset(code: str, [опционально] handler: function)
+```
+
+Удаляет событие, добавляя обработчик, если указан.
+
 ```lua
 events.emit(code: str, args...) -> bool
 ```

res/scripts/stdlib.lua

@@ -23,6 +23,14 @@ function events.on(event, func)
     table.insert(events.handlers[event], func)
 end
 
+function events.reset(event, func)
+    if func == nil then
+        events.handlers[event] = nil
+    else
+        events.handlers[event] = {func}
+    end
+end
+
 function events.remove_by_prefix(prefix)
     for name, handlers in pairs(events.handlers) do
         local actualname = name

src/logic/scripting/scripting.cpp

@@ -616,7 +616,7 @@ bool scripting::register_event(
     if (lua::getfield(L, name)) {
         lua::pop(L);
         lua::getglobal(L, "events");
-        lua::getfield(L, "on");
+        lua::getfield(L, "reset");
         lua::pushstring(L, id);
         lua::getfield(L, name, -4);
         lua::call_nothrow(L, 2);
@@ -706,6 +706,7 @@ void scripting::load_layout_script(
     uidocscript& script
 ) {
     int env = *senv;
+
     lua::pop(lua::get_main_state(), load_script(env, "layout", file));
     script.onopen = register_event(env, "on_open", prefix + ".open");
     script.onprogress =