add gs

RCCService2018/content/LuaPackages/RoactImpl/Change.lua

@@ -0,0 +1,36 @@
+--[[
+	Change is used to generate special prop keys that can be used to connect to
+	GetPropertyChangedSignal.
+
+	Generally, Change is indexed by a Roblox property name:
+
+		Roact.createElement("TextBox", {
+			[Roact.Change.Text] = function(rbx)
+				print("The TextBox", rbx, "changed text to", rbx.Text)
+			end,
+		})
+]]
+
+local Change = {}
+
+local changeMetatable = {
+	__tostring = function(self)
+		return ("ChangeListener(%s)"):format(self.name)
+	end
+}
+
+setmetatable(Change, {
+	__index = function(self, propertyName)
+		local changeListener = {
+			type = Change,
+			name = propertyName
+		}
+
+		setmetatable(changeListener, changeMetatable)
+		Change[propertyName] = changeListener
+
+		return changeListener
+	end,
+})
+
+return Change