Move bindings to druid, update widgets

druid/druid.lua

@@ -1,3 +1,4 @@
+local event = require("event.event")
 local events = require("event.events")
 local settings = require("druid.system.settings")
 local druid_instance = require("druid.system.druid_instance")
@@ -83,4 +84,49 @@ function M.on_language_change()
 end
 
 
+local WRAPPED_WIDGETS = {}
+
+---Set a widget to the current game object. The game object can acquire the widget by calling `bindings.get_widget`
+---It wraps with events only top level functions cross-context, so no access to nested widgets functions
+---@param widget druid.widget
+function M.set_widget(widget)
+	local object = msg.url()
+	object.fragment = nil
+
+	-- Make a copy of the widget with all functions wrapped in events
+	-- It makes available to call gui functions from game objects
+	local wrapped_widget = setmetatable({}, { __index = widget })
+	local parent_table = getmetatable(widget).__index
+
+	-- Go through all functions and wrap them in events
+	for key, value in pairs(parent_table) do
+		if type(value) == "function" then
+			wrapped_widget[key] = event.create(function(_, ...)
+				return value(widget, ...)
+			end)
+		end
+	end
+
+	WRAPPED_WIDGETS[object.socket] = WRAPPED_WIDGETS[object.socket] or {}
+	WRAPPED_WIDGETS[object.socket][object.path] = wrapped_widget
+end
+
+
+---@param object_url string|userdata|url|nil Root object, if nil current object will be used
+---@return druid.widget|nil
+function M.get_widget(object_url)
+	object_url = object_url or msg.url()
+	if object_url then
+		object_url = msg.url(object_url --[[@as string]])
+	end
+
+	local socket_widgets = WRAPPED_WIDGETS[object_url.socket]
+	if not socket_widgets then
+		return nil
+	end
+
+	return socket_widgets[object_url.path]
+end
+
+
 return M