Initial commit

Author: nsc

.gitignore

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+.DS_Store
+/.build
+/Packages
+/*.xcodeproj
+xcuserdata/
+DerivedData/
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata

.swiftpm/xcode/package.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

Package.swift

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+// swift-tools-version:5.5
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "ValueTypes",
+    products: [
+        // Products define the executables and libraries a package produces, and make them visible to other packages.
+        .library(
+            name: "ValueTypes",
+            targets: ["ValueTypes"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        .target(
+            name: "ValueTypes",
+            dependencies: []),
+        .testTarget(
+            name: "ValueTypesTests",
+            dependencies: ["ValueTypes"]),
+    ]
+)

README.md

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+# ValueTypes
+
+A description of this package.

Sources/ValueTypes/Project.swift

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+import Foundation
+
+public struct Project {
+    public init() {
+    }
+    
+    var pages: [Page] = []
+}
+
+public struct Page {
+    public var frame: CGRect = .zero
+    var pageObjects: [PageObject] = []
+}
+
+public protocol PageObject {
+    var frame: CGRect { get set }
+}
+
+public struct TextObject: PageObject {
+    public var frame: CGRect = .zero
+    public var text: String = ""
+}
+
+public struct ImageObject: PageObject {
+    public var frame: CGRect = .zero
+    public var imagePath: URL?
+}
+
+public struct Group: PageObject {
+    public var frame: CGRect = .zero
+    public var pageObjects: [PageObject] = []
+}
+

Tests/ValueTypesTests/ValueTypesTests.swift

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+import XCTest
+@testable import ValueTypes
+
+final class ValueTypesTests: XCTestCase {
+    func testExample() throws {
+        var project = makeProject()
+        
+        // Shift all objects inside of a group on some page
+        for i in 0..<project.pages.count {
+            var page = project.pages[i]
+            
+            for j in 0..<page.pageObjects.count {
+                let pageObject = page.pageObjects[j]
+            
+                if var group = pageObject as? Group {
+                    for k in 0..<group.pageObjects.count {
+                        var pageObject = group.pageObjects[k]
+                        
+                        let shiftedFrame = pageObject.frame.applying(CGAffineTransform(translationX: 10, y: 10))
+                        pageObject.frame = shiftedFrame
+                        
+                        // Write back changed page object
+                        group.pageObjects[k] = pageObject
+                    }
+                
+                    // Write back changed group
+                    page.pageObjects[j] = group
+                }
+            }
+            
+            // Write back changed page
+            project.pages[i] = page
+        }
+    }
+    
+    func makeProject() -> Project {
+        let sheetSize = CGSize(width: 2000, height: 500)
+        
+        var project = Project()
+        project.pages = [Page(frame: CGRect(origin: .zero, size: sheetSize)), Page(frame: CGRect(origin: .zero, size: sheetSize))]
+        let group = Group(frame: CGRect(x: 100, y: 100, width: 800, height: 400), pageObjects: [TextObject(), ImageObject()])
+        project.pages[0].pageObjects = [TextObject(), ImageObject(), group]
+        
+        return project
+    }
+}