ShopPage Component example

docs/tutorials/shop-page.md

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+# Shop page
+_Goal: Create a page to sell developer products in a game._
+
+[add an image of the result we are expecting]
+
+## Top Component
+Let's start by creating the top level component, that will be the page containing the items for sale in the game.
+
+```lua
+
+```
+
+### Viewing the component
+
+
+## Items Grid
+
+
+## Product Item
+[remind state and props]
+[props validation]
+
+### Adding some animations
+
+
+## Integration
+
+### In a Roact project
+Here explain how the component can be used my another component or how it can be mounted on it's own (like main.client.lua does)
+
+### In a non-Roact project
+Explain how the page could be mounted in an existing UI instances tree. That opens the subject that it is possible to slowly port an existing UI to use Roact part by part.

examples/shop-page/Components/ProductItem.lua

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+local MarketplaceService = game:GetService("MarketplaceService")
+local Players = game:GetService("Players")
+local ReplicatedStorage = game:GetService("ReplicatedStorage")
+
+local Roact = require(ReplicatedStorage.Roact)
+
+local ProductItem = Roact.Component:extend("ProductItem")
+
+function ProductItem:init()
+	self:setState({
+		onMouseEnter = function()
+			-- grow the icon a little
+		end,
+		onMouseLeave = function()
+			-- go back to original size
+		end,
+		onActivated = function()
+			local props = self.props
+
+			MarketplaceService:PromptProductPurchase(Players.LocalPlayer, props.productId)
+		end
+	})
+	self.padding, self.updatePadding = Roact.createBinding(0)
+end
+
+function ProductItem:render()
+	local props = self.props
+	local state = self.state
+	local padding = self.padding
+
+	return Roact.createElement("ImageButton", {
+		BackgroundTransparency = 1,
+		Image = "",
+		LayoutOrder = props.order or props.price,
+		[Roact.Event.Activated] = state.onActivated,
+		[Roact.Event.MouseEnter] = state.onMouseEnter,
+		[Roact.Event.MouseLeave] = state.onMouseLeave,
+	}, {
+		Icon = Roact.createElement("ImageLabel", {
+			AnchorPoint = Vector2.new(0.5, 0.5),
+			BackgroundTransparency = 1,
+			Image = props.image,
+			Position = UDim2.new(0.5, 0, 0.5, 0),
+			Size = UDim2.new(1, padding, 1, padding),
+		}),
+		PriceLabel = Roact.createElement("TextLabel", {
+			AnchorPoint = Vector2.new(0.5, 1),
+			BackgroundTransparency = 1,
+			Font = Enum.Font.SourceSans,
+			Text = ("R$ %d"):format(props.price),
+			TextColor3 = Color3.fromRGB(10, 200, 10),
+			TextScaled = true,
+			TextStrokeTransparency = 0,
+			TextStrokeColor3 = Color3.fromRGB(255, 255, 255),
+			Position = UDim2.new(0.5, 0, 1, 0),
+			Size = UDim2.new(1, 0, 0.3, 0),
+		}),
+	})
+end
+
+function ProductItem.validateProps(props)
+	return pcall(function()
+		assert(
+			type(props.image) == "string",
+			("props.image should be a string (got %q)"):format(type(props.image))
+		)
+		assert(
+			type(props.price) == "number",
+			("props.price should be a number (got %q)"):format(type(props.price))
+		)
+		assert(
+			type(props.productId) == "string" or type(props.productId) == "number",
+			("props.productId should be a string or a number (got %q)"):format(type(props.productId))
+		)
+		assert(
+			props.order == nil or type(props.order) == "number",
+			("props.order should be a number (got %q)"):format(type(props.order))
+		)
+	end)
+end
+
+return ProductItem

examples/shop-page/Components/ProductItemList.lua

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+local ReplicatedStorage = game:GetService("ReplicatedStorage")
+
+local Components = ReplicatedStorage:WaitForChild("Components")
+
+local Roact = require(ReplicatedStorage.Roact)
+
+local ProductItem = require(Components:WaitForChild("ProductItem"))
+
+local function ProductItemList(props)
+	local elements = {}
+
+	for i=1, #props.items do
+		local item = props.items[i]
+
+		elements[item.identifier] = Roact.createElement(ProductItem, {
+			image = item.image,
+			price = item.price,
+			productId = item.productId,
+			order = item.order,
+		})
+	end
+
+	return Roact.createFragment(elements)
+end
+
+return ProductItemList

examples/shop-page/Components/ShopPage.lua

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+local ReplicatedStorage = game:GetService("ReplicatedStorage")
+local Players = game:GetService("Players")
+
+local Components = ReplicatedStorage:WaitForChild("Components")
+
+local Roact = require(ReplicatedStorage.Roact)
+
+local ProductItemList = require(Components:WaitForChild("ProductItemList"))
+
+local ShopPage = Roact.Component:extend("ShopPage")
+
+ShopPage.defaultProps = {
+	padding = 0,
+}
+
+function ShopPage:init()
+	self:setState({
+		cellSize = 100,
+		canvasHeight = 100,
+	})
+
+	self.onAbsoluteSizeChanged = function(frame)
+		local props = self.props
+		local state = self.state
+		local padding = props.padding
+		local itemsPerRow = props.itemsPerRow
+
+		local totalWidth = frame.AbsoluteSize.X
+		local cellWidth = (totalWidth - padding * (itemsPerRow + 1)) / itemsPerRow
+		local cellHeight = cellWidth * props.itemAspectRatio
+		local rows = math.ceil(#props.items / itemsPerRow)
+		local canvasHeight = rows * cellHeight + padding * (rows + 1)
+
+		self:setState({
+			cellSize = cellWidth,
+			canvasHeight = canvasHeight,
+		})
+	end
+end
+
+function ShopPage:render()
+	local props = self.props
+	local state = self.state
+	local padding = props.padding
+	local cellSize = state.cellSize
+	local canvasHeight = state.canvasHeight
+
+	local frameProps = {}
+
+	for key, value in pairs(props.frameProps) do
+		frameProps[key] = value
+	end
+
+	frameProps.CanvasSize = UDim2.new(0, 0, 0, canvasHeight)
+	frameProps.ClipsDescendants = true
+	frameProps[Roact.Change.AbsoluteSize] = self.onAbsoluteSizeChanged
+
+	return Roact.createElement("ScrollingFrame", frameProps, {
+		UIGrid = Roact.createElement("UIGridLayout", {
+			CellPadding = UDim2.new(0, padding, 0, padding),
+			CellSize = UDim2.new(0, cellSize, 0, cellSize * props.itemAspectRatio),
+			HorizontalAlignment = Enum.HorizontalAlignment.Center,
+			VerticalAlignment = Enum.VerticalAlignment.Center,
+			SortOrder = Enum.SortOrder.LayoutOrder,
+		}),
+		ProductItems = Roact.createElement(ProductItemList, {
+			items = props.items
+		}),
+	})
+end
+
+function ShopPage.validateProps(props)
+	return pcall(function()
+		assert(
+			type(props.padding) == "number",
+			("props.padding should be a number (got %q)"):format(type(props.padding))
+		)
+		assert(
+			type(props.frameProps) == "table",
+			("props.frameProps should be a table (got %q)"):format(type(props.frameProps))
+		)
+	end)
+end
+
+return ShopPage

examples/shop-page/default.project.json

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+{
+	"name": "Roact Test Place",
+	"tree": {
+		"$className": "DataModel",
+		"StarterPlayer": {
+			"$className": "StarterPlayer",
+			"StarterPlayerScripts": {
+				"$className": "StarterPlayerScripts",
+				"main": {
+					"$path": "main.client.lua"
+				}
+			}
+		},
+		"ReplicatedStorage": {
+			"$className": "ReplicatedStorage",
+			"Components": {
+				"$path": "Components"
+			}
+		}
+	}
+}

examples/shop-page/main.client.lua

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+local ReplicatedStorage = game:GetService("ReplicatedStorage")
+local Players = game:GetService("Players")
+
+local Components = ReplicatedStorage:WaitForChild("Components")
+
+local Roact = require(ReplicatedStorage.Roact)
+
+Roact.setGlobalConfig({
+	propValidation = true
+})
+
+local ShopPage = require(Components:WaitForChild("ShopPage"))
+
+local screenGui = Instance.new("ScreenGui")
+screenGui.Parent = Players.LocalPlayer:WaitForChild("PlayerGui")
+
+local shopPage = Roact.createElement(ShopPage, {
+	items = {
+		{
+			identifier = "Red Visor",
+			image = "https://www.roblox.com/asset-thumbnail/image?assetId=139618072&width=420&height=420&format=png",
+			price = 30,
+			productId = 0,
+		},
+		{
+			identifier = "Green Visor",
+			image = "https://www.roblox.com/asset-thumbnail/image?assetId=20264649&width=420&height=420&format=png",
+			price = 50,
+			productId = 0,
+		},
+		{
+			identifier = "Yellow Visor",
+			image = "https://www.roblox.com/asset-thumbnail/image?assetId=7135977&width=420&height=420&format=png",
+			price = 40,
+			productId = 0,
+		},
+		{
+			identifier = "Blue Visor",
+			image = "https://www.roblox.com/asset-thumbnail/image?assetId=1459035&width=420&height=420&format=png",
+			price = 55,
+			productId = 0,
+		},
+		{
+			identifier = "Dark Blue Visor",
+			image = "https://www.roblox.com/asset-thumbnail/image?assetId=68268372&width=420&height=420&format=png",
+			price = 60,
+			productId = 0,
+		},
+		{
+			identifier = "Purple Visor",
+			image = "https://www.roblox.com/asset-thumbnail/image?assetId=334661971&width=420&height=420&format=png",
+			price = 100,
+			productId = 0,
+		},
+	},
+	itemAspectRatio = 1,
+	itemsPerRow = 3,
+	padding = 10,
+	frameProps = {
+		AnchorPoint = Vector2.new(0.5, 0.5),
+		BorderSizePixel = 0,
+		Position = UDim2.new(0.5, 0, 0.5, 0),
+		Size = UDim2.new(0.5, 0, 0.5, 0),
+	},
+})
+
+local handle = Roact.mount(shopPage, screenGui)