Add exit confirmation dialog on ESC in main menu (#16164)

builtin/mainmenu/dlg_confirm_exit.lua

@@ -0,0 +1,54 @@
+-- Luanti
+-- Copyright (C) 2025 siliconsniffer
+-- SPDX-License-Identifier: LGPL-2.1-or-later
+
+
+local function exit_dialog_formspec()
+	local show_dialog = core.settings:get_bool("enable_esc_dialog", true)
+	local formspec = {
+		"formspec_version[10]" ..
+		"size[10,3.6]" ..
+		"style_type[label;font=bold]" ..
+		"style[btn_quit_confirm_yes;bgcolor=red]" ..
+		"label[0.5,0.5;" .. fgettext("Are you sure you want to quit?") .. "]" ..
+		"checkbox[0.5,1.4;cb_show_dialog;" .. fgettext("Always show this dialog.") .. ";" .. tostring(show_dialog) .. "]" ..
+		"button[0.5,2.3;3,0.8;btn_quit_confirm_cancel;" .. fgettext("Cancel") .. "]" ..
+		"button[6.5,2.3;3,0.8;btn_quit_confirm_yes;" .. fgettext("Quit") .. "]" ..
+		"set_focus[btn_quit_confirm_yes]"
+	}
+	return table.concat(formspec, "")
+end
+
+
+local function exit_dialog_buttonhandler(this, fields)
+	if fields.cb_show_dialog ~= nil then
+		core.settings:set_bool("enable_esc_dialog", core.is_yes(fields.cb_show_dialog))
+		return false
+	elseif fields.btn_quit_confirm_yes then
+		this:delete()
+		core.close()
+		return true
+	elseif fields.btn_quit_confirm_cancel then
+		this:delete()
+		this:show()
+		return true
+	end
+end
+
+
+local function event_handler(event)
+	if event == "DialogShow" then
+		mm_game_theme.set_engine(true) -- hide the menu header
+		return true
+	end
+	return false
+end
+
+
+function create_exit_dialog()
+	local retval = dialog_create("dlg_exit",
+		exit_dialog_formspec,
+		exit_dialog_buttonhandler,
+		event_handler)
+	return retval
+end

builtin/mainmenu/init.lua

@@ -28,6 +28,7 @@ dofile(menupath .. DIR_DELIM .. "content" .. DIR_DELIM .. "init.lua")
 
 dofile(menupath .. DIR_DELIM .. "dlg_config_world.lua")
 dofile(basepath .. "common" .. DIR_DELIM .. "settings" .. DIR_DELIM .. "init.lua")
+dofile(menupath .. DIR_DELIM .. "dlg_confirm_exit.lua")
 dofile(menupath .. DIR_DELIM .. "dlg_create_world.lua")
 dofile(menupath .. DIR_DELIM .. "dlg_delete_content.lua")
 dofile(menupath .. DIR_DELIM .. "dlg_delete_world.lua")
@@ -49,7 +50,16 @@ local tabs = {
 --------------------------------------------------------------------------------
 local function main_event_handler(tabview, event)
 	if event == "MenuQuit" then
-		core.close()
+		local show_dialog = core.settings:get_bool("enable_esc_dialog")
+		if not ui.childlist["mainmenu_quit_confirm"] and show_dialog then
+			tabview:hide()
+			local dlg = create_exit_dialog()
+			dlg:set_parent(tabview)
+			dlg:show()
+		else
+			core.close()
+		end
+		return true
 	end
 	return true
 end

builtin/settingtypes.txt

@@ -162,6 +162,9 @@ autojump (Automatic jumping) bool false
 #    On touchscreens, this only affects digging.
 safe_dig_and_place (Safe digging and placing) bool false
 
+#	 Enable a confirmation dialog before closing.
+enable_esc_dialog (Confirmation dialog before closing) bool true
+
 [*Keyboard and Mouse]
 
 #    Invert vertical mouse movement.