data_bind.gd

extends Node
var data:Dictionary #key: name:String, val:[Node, property:NodePath]
var handlers:Dictionary # key: name:String, val:[Node, meth name:String]

func dump():
	print("Data:")
	for key in data:
		print(String(path(key)) + ":" + String(property(key)))

	print("\nHandlers:")
	for key in handlers:
		for handler in handlers[key]:
			var hPath = String(handler[0].get_path())
			var hMeth = handler[1]
			print(hPath + "." + hMeth)

func src(name:String, path:NodePath, property:NodePath):
	data[name] = [get_node(path), property]

func unsrc(name:String):
	data.erase(name)

	if handlers.has(name):
		handlers[name].clear()

func path(name:String) -> NodePath:
	return data[name][0].get_path()

func property(name:String) -> NodePath:
	return data[name][1]

func val(name:String):
	var source = data[name]
	if source != null:
		return source[0].get_indexed(source[1])

	return null

func put(name:String, val):
	var source = data[name]
	if source != null:
		source[0].set_indexed(source[1], val)

	if handlers.has(name):
		for handler in handlers[name]:
			handler[0].call(handler[1])

func bind(name:String, path:NodePath, handler:String):
	if !data.has(name):
		printerr("Trying to bind to non-existent data source: " + name + " with: " + String(path) + "." + handler)

	if !handlers.has(name):
		handlers[name] = []

	handlers[name].append([get_node(path), handler])

func unbind(name:String, path:NodePath, handler:String):
	if !handlers.has(name):
		return
	var index = 0
	var node = get_node(path)
	for entry in handlers[name]:
		if entry[0] == node and entry[1] == handler:
			break
		index += 1

	handlers[name].remove(index)