diff --git a/widget/app_launcher/init.lua b/widget/app_launcher/init.lua
index 0e6f6ae..b09204b 100644
--- a/widget/app_launcher/init.lua
+++ b/widget/app_launcher/init.lua
@@ -228,6 +228,7 @@ local function scroll(self, dir)
     if can_scroll then
         local app = gtable.cycle_value(self:get_grid().children, self._private.active_widget, step_size)
         app:select()
+        self:emit_signal("scroll", dir)
     else
         if_cant_scroll_func()
     end