Update DisplayList print

Author: Kyle-Ye

Sources/OpenSwiftUI/Integration/Hosting/UIKit/View/UIHostingView.swift

@@ -509,13 +509,66 @@ extension _UIHostingView: ViewRendererHost {
     package func updateScrollableContainerSize() {
         // preconditionFailure("TODO")
     }
-    
-    package func renderDisplayList(_ list: DisplayList, asynchronously: Bool, time: Time, nextTime: Time, targetTimestamp: Time?, version: DisplayList.Version, maxVersion: DisplayList.Version) -> Time {
-        #if DEBUG
-        print(list.description)
-        #endif
-        // preconditionFailure("TODO")
-        return .infinity
+
+    var shouldDisableUIKitAnimations: Bool {
+        // FIXME
+        false
+    }
+
+    package func renderDisplayList(
+        _ list: DisplayList,
+        asynchronously: Bool,
+        time: Time,
+        nextTime: Time,
+        targetTimestamp: Time?,
+        version: DisplayList.Version,
+        maxVersion: DisplayList.Version
+    ) -> Time {
+        func render() -> Time {
+            let scale = window?.screen.scale ?? 1
+            let environment = DisplayList.ViewRenderer.Environment(contentScale: scale)
+            return renderer.render(
+                rootView: self,
+                from: list,
+                time: time,
+                nextTime: nextTime,
+                version: version,
+                maxVersion: maxVersion,
+                environment: environment
+            )
+        }
+
+        if asynchronously {
+            if let renderedTime = renderer.renderAsync(
+                to: list,
+                time: time,
+                nextTime: nextTime,
+                targetTimestamp: targetTimestamp,
+                version: version,
+                maxVersion: maxVersion
+            ) {
+                return renderedTime
+            } else {
+                var renderedTime = nextTime
+                Update.syncMain {
+                    renderedTime = render()
+                }
+                return renderedTime
+            }
+        } else {
+            if Self.areAnimationsEnabled, shouldDisableUIKitAnimations {
+                var renderedTime = nextTime // FIXME
+                Self.performWithoutAnimation {
+                    renderedTime = render()
+                }
+                allowUIKitAnimationsForNextUpdate = false
+                return renderedTime
+            } else {
+                let renderedTime = render()
+                allowUIKitAnimationsForNextUpdate = false
+                return renderedTime
+            }
+        }
     }
 
     package func updateRootView() {

Sources/OpenSwiftUICore/Render/DisplayList/DisplayList.ViewRenderer.swift renamed to Sources/OpenSwiftUICore/Render/DisplayList/DisplayListViewRenderer.swift

@@ -4,7 +4,7 @@
 //
 //  Audited for iOS 18.0
 //  Status: Blocked by ViewUpdater and ViewRasterizer
-//  ID: 21FFA3C7D88AC65BB559906758271BFC
+//  ID: 21FFA3C7D88AC65BB559906758271BFC (SwiftUICore)
 
 package import Foundation
 
@@ -118,7 +118,13 @@ extension DisplayList {
             renderer?.viewCacheIsEmpty ?? true
         }
     }
-    
+}
+
+// MARK: - DisplayList.ViewRasterizer
+
+private var printTree: Bool?
+
+extension DisplayList {
     private final class ViewRasterizer: ViewRendererBase {
         let platform: DisplayList.ViewUpdater.Platform
         weak var host: ViewRendererHost?
@@ -127,27 +133,34 @@ extension DisplayList {
         let renderer: DisplayList.GraphicsRenderer
         var seed: DisplayList.Seed
         var lastContentsScale: CGFloat
-        
+
         init(platform: DisplayList.ViewUpdater.Platform, host: ViewRendererHost?, rootView: AnyObject, options: _RendererConfiguration.RasterizationOptions) {
             preconditionFailure("")
         }
-        
+
         var exportedObject: AnyObject? {
             platform.definition.getRBLayer(drawingView: drawingView!)
         }
-        
+
         func render(rootView: AnyObject, from list: DisplayList, time: Time, version: DisplayList.Version, maxVersion: DisplayList.Version, environment: DisplayList.ViewRenderer.Environment) -> Time {
-            preconditionFailure("TODO")
+            // preconditionFailure("TODO")
+            if printTree == nil {
+                printTree = ProcessEnvironment.bool(forKey: "OPENSWIFTUI_PRINT_TREE")
+            }
+            if let printTree, printTree {
+                print("View \(Unmanaged.passUnretained(rootView).toOpaque()) at \(time):\n\(list.description)")
+            }
+            return .zero
         }
-        
+
         func renderAsync(to list: DisplayList, time: Time, targetTimestamp: Time?, version: DisplayList.Version, maxVersion: DisplayList.Version) -> Time? {
             preconditionFailure("TODO")
         }
-        
+
         func destroy(rootView: AnyObject) {
             preconditionFailure("TODO")
         }
-        
+
         var viewCacheIsEmpty: Bool {
             preconditionFailure("TODO")
         }

Sources/OpenSwiftUICore/Render/DisplayList/DisplayList.ViewUpdater.swift renamed to Sources/OpenSwiftUICore/Render/DisplayList/DisplayListViewUpdater.swift

@@ -4,12 +4,18 @@
 //
 //  Audited for iOS 18.0
 //  Status: WIP
+//  ID: B86250B2E056EB47628ECF46032DFA4C (SwiftUICore)
+
+private var printTree: Bool?
 
 extension DisplayList {
     // FIXME
     final package class ViewUpdater: ViewRendererBase {
         init() {
-            preconditionFailure("")
+            // preconditionFailure("TODO")
+            platform = .init(rawValue: 0)
+            exportedObject = nil
+            viewCacheIsEmpty = false
         }
 
         init(platform: Platform, exportedObject: AnyObject? = nil, viewCacheIsEmpty: Bool) {
@@ -23,7 +29,14 @@ extension DisplayList {
         var exportedObject: AnyObject?
 
         func render(rootView: AnyObject, from list: DisplayList, time: Time, version: DisplayList.Version, maxVersion: DisplayList.Version, environment: DisplayList.ViewRenderer.Environment) -> Time {
-            .zero
+            // TODO
+            if printTree == nil {
+                printTree = ProcessEnvironment.bool(forKey: "OPENSWIFTUI_PRINT_TREE")
+            }
+            if let printTree, printTree {
+                print("View \(Unmanaged.passUnretained(rootView).toOpaque()) at \(time):\n\(list.description)")
+            }
+            return .zero
         }
 
         func renderAsync(to list: DisplayList, time: Time, targetTimestamp: Time?, version: DisplayList.Version, maxVersion: DisplayList.Version) -> Time? {