fix event

src/utils/define.hpp

@@ -3,16 +3,15 @@
 #define BIT(x)\
   (1 << x)
 
-#define VE_EVENT_FN\
-  std::bind(&application::on_event, this, std::placeholders::_1)
-
 #define VE_FN_OVERIDE()\
   public:\
     void on_attach() override;\
-    void on_detach() override;\
     void render() override;\
     void on_event(VE::event e) override
 
+#define VE_CONNECT(DEF_CLASS, DEF_FUNCTION) VE::event_manager::instance().connect(std::bind(&DEF_CLASS::DEF_FUNCTION, this, std::placeholders::_1));
+#define EMIT(e) VE::event_manager::instance().emit(e)
+
 #define VE_PUSH_FONT(def_font, def_size)\
   ImGui::PushFont(VE::style::fonts::get_font(VE::style::fonts::font_type::def_font, def_size)) 
 #define VE_POP_FONT() ImGui::PopFont()