add gs

RCCService2021/ExtraContent/LuaPackages/RoactUtilities/ExternalEventConnection.lua

@@ -0,0 +1,51 @@
+--[[
+	A component that establishes a connection to a Roblox event when it is rendered.
+]]
+
+local CorePackages = game:GetService("CorePackages")
+local Roact = require(CorePackages.Roact)
+local ExternalEventConnection = Roact.Component:extend("ExternalEventConnection")
+
+function ExternalEventConnection:init()
+	self.connection = nil
+end
+
+--[[
+	Render the child component so that ExternalEventConnections can be nested like so:
+
+		Roact.createElement(ExternalEventConnection, {
+			event = UserInputService.InputBegan,
+			callback = inputBeganCallback,
+		}, {
+			Roact.createElement(ExternalEventConnection, {
+				event = UserInputService.InputEnded,
+				callback = inputChangedCallback,
+			})
+		})
+]]
+function ExternalEventConnection:render()
+	return Roact.oneChild(self.props[Roact.Children])
+end
+
+function ExternalEventConnection:didMount()
+	local event = self.props.event
+	local callback = self.props.callback
+
+	self.connection = event:Connect(callback)
+end
+
+function ExternalEventConnection:didUpdate(oldProps)
+	if self.props.event ~= oldProps.event or self.props.callback ~= oldProps.callback then
+		self.connection:Disconnect()
+
+		self.connection = self.props.event:Connect(self.props.callback)
+	end
+end
+
+function ExternalEventConnection:willUnmount()
+	self.connection:Disconnect()
+
+	self.connection = nil
+end
+
+return ExternalEventConnection