GEEKING

PlatformContent/pc/scripts/ui/Modules/AssetManager.lua

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+-- Written by Kip Turner, Copyright ROBLOX 2015
+
+local GuiService = game:GetService('GuiService')
+local CoreGui = Game:GetService("CoreGui")
+
+local GuiRoot = CoreGui:FindFirstChild("RobloxGui")
+local Modules = GuiRoot:FindFirstChild("Modules")
+
+local Utility = require(Modules:FindFirstChild('Utility'))
+
+local AssetManager = {}
+
+
+local TrackedAssets = {}
+local WeakTrackedAssets = {}
+
+-- Set weak-keys table
+setmetatable(WeakTrackedAssets, {__mode = 'k' })
+
+local function GetScreenSize()
+	-- return GuiService:GetScreenResolution()
+	return GuiRoot.AbsoluteSize
+end
+
+local function GetImageSuffixByScreenSize(screenSize)
+	if screenSize.Y <= 720 then
+		return '@720'
+	else
+		return '@1080'
+	end
+end
+
+local function UpdateAsset(asset, metadata)
+	if asset then
+		local newSize = GetScreenSize()
+		local newScreenSuffix = GetImageSuffixByScreenSize(newSize)
+		local imagePath = metadata['path'] .. newScreenSuffix .. metadata['extension']
+		asset.Image = imagePath
+		if metadata['sizes'] then
+			if newScreenSuffix == '@720' and metadata['sizes']['720'] then
+				asset.Size = metadata['sizes']['720']
+			elseif newScreenSuffix == '@1080' and metadata['sizes']['1080'] then
+				asset.Size = metadata['sizes']['1080']
+			end
+		end
+	end
+end
+
+local function OnAncestryChanged(descendant, descendantMetatable)
+	descendantMetatable = descendantMetatable or WeakTrackedAssets[descendant] or TrackedAssets[descendant]
+	if descendantMetatable then
+		if descendant.Parent == nil then
+			WeakTrackedAssets[descendant] = descendantMetatable
+			TrackedAssets[descendant] = nil
+		else
+			TrackedAssets[descendant] = descendantMetatable
+			WeakTrackedAssets[descendant] = nil
+			UpdateAsset(descendant, descendantMetatable)
+		end
+	end
+end
+
+-- rbxImageInstance is a gui object such as ImageButton or ImageLabel
+-- Imagepath is the local path to the image
+-- fileFormat is the file extension i.e. .png
+function AssetManager.LocalImage(rbxImageInstance, imagepath, sizes, fileFormat)
+	fileFormat = fileFormat or '.png'
+
+	if imagepath then
+		local metadataTable = {
+			['path'] = imagepath;
+			['extension'] = fileFormat;
+			['sizes'] = sizes;
+		}
+		UpdateAsset(rbxImageInstance, metadataTable)
+		OnAncestryChanged(rbxImageInstance, metadataTable)
+	end
+
+	return rbxImageInstance
+end
+
+function AssetManager.CreateShadow(zIndex)
+	return Utility.Create'ImageLabel'
+	{
+		Name = 'Shadow';
+		Image = 'rbxasset://textures/ui/Shell/Buttons/Generic9ScaleShadow.png';
+		Size = UDim2.new(1,3,1,3);
+		Position = UDim2.new(0,0,0,0);
+		ScaleType = Enum.ScaleType.Slice;
+		SliceCenter = Rect.new(10,10,28,28);
+		BackgroundTransparency = 1;
+		ZIndex = zIndex or 1;
+	}
+end
+
+local LastScreenSuffix = GetImageSuffixByScreenSize(GetScreenSize())
+GuiRoot.Changed:connect(function(prop)
+	if prop == 'AbsoluteSize' then
+		local newSize = GetScreenSize()
+		local newScreenSuffix = GetImageSuffixByScreenSize(newSize)
+		if newScreenSuffix ~= LastScreenSuffix then
+			for asset, metadata in pairs(TrackedAssets) do
+				UpdateAsset(asset, metadata)
+			end
+			LastScreenSuffix = newScreenSuffix
+		end
+	end
+end)
+
+
+GuiRoot.DescendantAdded:connect(function(descendant)
+	if WeakTrackedAssets[descendant] or TrackedAssets[descendant] then
+		-- need to spawn because we haven't got the new parent yet
+		spawn(function()
+			if descendant then
+				OnAncestryChanged(descendant)
+			end
+		end)
+	end
+end)
+
+GuiRoot.DescendantRemoving:connect(function(descendant)
+	if WeakTrackedAssets[descendant] or TrackedAssets[descendant] then
+		-- need to spawn because we haven't got the new parent yet
+		spawn(function()
+			if descendant then
+				OnAncestryChanged(descendant)
+			end
+		end)
+	end
+end)
+
+
+return AssetManager