Stars ref

submodules/ComponentFlow/Source/Components/TransformContents.swift

@@ -0,0 +1,54 @@
+import Foundation
+import UIKit
+
+public final class TransformContents<ChildEnvironment: Equatable>: CombinedComponent {
+    public typealias EnvironmentType = ChildEnvironment
+
+    private let content: AnyComponent<ChildEnvironment>
+    private let fixedSize: CGSize?
+    private let translation: CGPoint
+
+    public init(content: AnyComponent<ChildEnvironment>, fixedSize: CGSize? = nil, translation: CGPoint) {
+        self.content = content
+        self.fixedSize = fixedSize
+        self.translation = translation
+    }
+
+    public static func ==(lhs: TransformContents<ChildEnvironment>, rhs: TransformContents<ChildEnvironment>) -> Bool {
+        if lhs.content != rhs.content {
+            return false
+        }
+        if lhs.fixedSize != rhs.fixedSize {
+            return false
+        }
+        if lhs.translation != rhs.translation {
+            return false
+        }
+        return true
+    }
+
+    public static var body: Body {
+        let child = Child(environment: ChildEnvironment.self)
+
+        return { context in
+            let child = child.update(
+                component: context.component.content,
+                environment: { context.environment[ChildEnvironment.self] },
+                availableSize: context.availableSize,
+                transition: context.transition
+            )
+
+            let size = context.component.fixedSize ?? child.size
+
+            var childFrame = child.size.centered(in: CGRect(origin: CGPoint(), size: size))
+            childFrame.origin.x += context.component.translation.x
+            childFrame.origin.y += context.component.translation.y
+
+            context.add(child
+                .position(childFrame.center)
+            )
+
+            return size
+        }
+    }
+}