add gs

RCCService2018/content/internal/AppShell/Modules/Shell/Components/RenderStep.lua

@@ -0,0 +1,43 @@
+--[[
+		A simple component that allows you to bind to RenderStep
+
+		Props:
+			name - the name of the bind
+			priority - when during the render step to call the function
+			callback - function that will be invoked on render step
+
+		Usage:
+
+			RenderCn = Roact.createElement(RenderStep, {
+				name = "MyRenderStep",
+				priority = Enum.RenderPriority.Input.Value,
+				callback = function() print("stepping") end
+			})
+]]
+local RunService = game:GetService("RunService")
+local Modules = game:GetService("CoreGui").RobloxGui.Modules
+
+local Roact = require(Modules.Common.Roact)
+
+local RenderStep = Roact.Component:extend("RenderStep")
+
+function RenderStep:render()
+	return nil
+end
+
+function RenderStep:didMount()
+	RunService:BindToRenderStep(self.props.name, self.props.priority, self.props.callback)
+end
+
+function RenderStep:didUpdate(oldProps)
+	if self.props.callback ~= oldProps.callback or self.props.name ~= oldProps.name then
+		RunService:UnbindFromRenderStep(oldProps.name)
+		RunService:BindToRenderStep(self.props.name, self.props.priority, self.props.callback)
+	end
+end
+
+function RenderStep:willUnmount()
+	RunService:UnbindFromRenderStep(self.props.name)
+end
+
+return RenderStep