Add initial rendering support for NSHostingView (#291)

* Add initial rendering support for NSHostingView

* Fix file headers

Author: Mx-Iris

Sources/COpenSwiftUI/AppKit/OpenSwiftUI+NSView.h

@@ -0,0 +1,31 @@
+//
+//  OpenSwiftUI+NSView.h
+//  COpenSwiftUI
+//
+//  Audited for macOS 15.0
+//  Status: WIP
+
+#ifndef OpenSwiftUI_NSView_h
+#define OpenSwiftUI_NSView_h
+
+#include "OpenSwiftUIBase.h"
+
+#if OPENSWIFTUI_TARGET_OS_OSX
+
+#import <AppKit/AppKit.h>
+
+OPENSWIFTUI_ASSUME_NONNULL_BEGIN
+
+@interface NSView (OpenSwiftUI)
+
+@property (strong, nullable) NSView *maskView;
+
+- (void)setFlipped:(BOOL)flipped;
+
+@end
+
+OPENSWIFTUI_ASSUME_NONNULL_END
+
+#endif /* OPENSWIFTUI_TARGET_OS_OSX */
+
+#endif /* OpenSwiftUI_NSView_h */

Sources/COpenSwiftUI/AppKit/OpenSwiftUI+NSView.m

@@ -0,0 +1,12 @@
+//
+//  OpenSwiftUI+NSView.m
+//  COpenSwiftUI
+//
+//  Audited for macOS 15.0
+//  Status: WIP
+
+#import "OpenSwiftUI+NSView.h"
+
+#if OPENSWIFTUI_TARGET_OS_OSX
+
+#endif

Sources/COpenSwiftUI/QuartzCore/CAChameleonLayer.h

@@ -0,0 +1,23 @@
+//
+//  CAChameleonLayer.h
+//  COpenSwiftUI
+//
+//  Audited for macOS 15.0
+//  Status: WIP
+
+#include "OpenSwiftUIBase.h"
+
+#if OPENSWIFTUI_TARGET_OS_OSX
+
+#import <QuartzCore/QuartzCore.h>
+
+OPENSWIFTUI_ASSUME_NONNULL_BEGIN
+
+@interface CAChameleonLayer : CALayer
+
+@end
+
+OPENSWIFTUI_ASSUME_NONNULL_END
+
+#endif /* OPENSWIFTUI_TARGET_OS_OSX */
+

Sources/COpenSwiftUI/QuartzCore/CAChameleonLayer.m

@@ -0,0 +1,9 @@
+//
+//  CAChameleonLayer.m
+//  COpenSwiftUI
+//
+//  Audited for macOS 15.0
+//  Status: WIP
+
+#import "CAChameleonLayer.h"
+

Sources/OpenSwiftUI/Integration/Hosting/AppKit/View/NSGraphicsView.swift

@@ -0,0 +1,27 @@
+//
+//  NSGraphicsView.swift
+//  OpenSwiftUI
+//
+//  Audited for macOS 15.0
+//  Status: WIP
+
+#if os(macOS)
+
+import OpenSwiftUI_SPI
+import AppKit
+
+final class _NSGraphicsView: NSView {
+    var recursiveIgnoreHitTest: Bool = false
+
+    var customAcceptsFirstMouse: Bool?
+
+    override init(frame frameRect: NSRect) {
+        super.init(frame: frameRect)
+    }
+
+    required init?(coder: NSCoder) {
+        super.init(coder: coder)
+    }
+}
+
+#endif

Sources/OpenSwiftUI/Integration/Hosting/AppKit/View/NSHostingView.swift

@@ -127,6 +127,7 @@ open class NSHostingView<Content>: NSView, XcodeViewDebugDataProvider where Cont
         // TODO
         wantsLayer = true
         // TODO
+        renderer.host = self
         HostingViewRegistry.shared.add(self)
         // TODO
         Update.end()
@@ -182,7 +183,7 @@ open class NSHostingView<Content>: NSView, XcodeViewDebugDataProvider where Cont
             context.allowsImplicitAnimation = false
             isUpdating = true
             // TODO
-            render()
+            render(targetTimestamp: Time())
             // TODO
             isUpdating = false
             // TODO
@@ -318,8 +319,67 @@ extension NSHostingView: ViewRendererHost {
 
     package func updateScrollableContainerSize() {}
 
-    package func renderDisplayList(_ list: DisplayList, asynchronously: Bool, time: Time, nextTime: Time, targetTimestamp: Time?, version: DisplayList.Version, maxVersion: DisplayList.Version) -> Time {
-        .infinity
+    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?.backingScaleFactor ?? 1
+            let environment = DisplayList.ViewRenderer.Environment(contentsScale: scale, opaqueBackground: isOpaque)
+            #if canImport(SwiftUI, _underlyingVersion: 6.0.87) && _OPENSWIFTUI_SWIFTUI_RENDER
+
+            return renderer.swiftUI_render(
+                rootView: self,
+                from: list,
+                time: time,
+                nextTime: nextTime,
+                version: version,
+                maxVersion: maxVersion,
+                environment: environment
+            )
+
+            #else
+            return renderer.render(
+                rootView: self,
+                from: list,
+                time: time,
+                nextTime: nextTime,
+                version: version,
+                maxVersion: maxVersion,
+                environment: environment
+            )
+            #endif
+        }
+
+        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 {
+            var renderedTime = nextTime
+            Update.syncMain {
+                renderedTime = render()
+            }
+            return renderedTime
+        }
     }
 
     package func updateRootView() {

Sources/OpenSwiftUI/Integration/Hosting/AppKit/View/NSInheritedView.swift

@@ -0,0 +1,25 @@
+//
+//  NSInheritedView.swift
+//  OpenSwiftUI
+//
+//  Audited for macOS 15.0
+//  Status: WIP
+
+#if os(macOS)
+
+import OpenSwiftUI_SPI
+import AppKit
+
+final class _NSInheritedView: NSView {
+    var hitTestsAsOpaque: Bool = false
+
+    override init(frame frameRect: NSRect) {
+        super.init(frame: frameRect)
+    }
+
+    required init?(coder: NSCoder) {
+        super.init(coder: coder)
+    }
+}
+
+#endif

Sources/OpenSwiftUI/Integration/Hosting/AppKit/View/NSProjectionView.swift

@@ -0,0 +1,26 @@
+//
+//  NSProjectionView.swift
+//  OpenSwiftUI
+//
+//  Audited for macOS 15.0
+//  Status: WIP
+
+#if os(macOS)
+
+import OpenSwiftUI_SPI
+import AppKit
+
+final class _NSProjectionView: NSView {
+
+    override var wantsUpdateLayer: Bool { true }
+    
+    override init(frame frameRect: NSRect) {
+        super.init(frame: frameRect)
+    }
+
+    required init?(coder: NSCoder) {
+        super.init(coder: coder)
+    }
+}
+
+#endif

Sources/OpenSwiftUI/Integration/Render/AppKit/NSViewPlatformViewDefinition.swift

@@ -8,16 +8,54 @@
 #if os(macOS)
 @_spi(DisplayList_ViewSystem) import OpenSwiftUICore
 import AppKit
+import OpenSwiftUISymbolDualTestsSupport
+import COpenSwiftUI
 
 // TODO
 final class NSViewPlatformViewDefinition: PlatformViewDefinition, @unchecked Sendable {
     override final class var system: PlatformViewDefinition.System { .nsView }
 
     override static func makeView(kind: PlatformViewDefinition.ViewKind) -> AnyObject {
-        // TODO
-        return NSView()
+        let view: NSView
+        switch kind {
+        case .chameleonColor:
+            return makeLayerView(type: CAChameleonLayer.self, kind: kind)
+        case .projection:
+            view = _NSProjectionView()
+        case .mask:
+            view = _NSGraphicsView()
+            view.mask = _NSInheritedView()
+            initView(view.mask!, kind: kind)
+        default:
+            view = kind.isContainer ? _NSInheritedView() : _NSGraphicsView()
+        }
+        initView(view, kind: kind)
+        return view
     }
 
+    private static func initView(_ view: NSView, kind: PlatformViewDefinition.ViewKind) {
+        view.wantsLayer = true
+        
+        if kind != .platformView && kind != .platformGroup {
+            view.setFlipped(true)
+            view.autoresizesSubviews = false
+            // TODO - UnifiedHitTestingFeature.isEnabled
+            // setIgnoreHitTest: true
+        }
+        
+        switch kind {
+        case .color, .image, .shape:
+            view.layer?.edgeAntialiasingMask = [.layerTopEdge, .layerBottomEdge, .layerLeftEdge, .layerRightEdge]
+            view.layer?.allowsEdgeAntialiasing = true
+            break
+        case .geometry, .projection, .mask:
+            view.layer?.allowsGroupOpacity = false
+            view.layer?.allowsGroupBlending = false
+        default:
+            break
+        }
+    }
+    
     override static func makeLayerView(type: CALayer.Type, kind: PlatformViewDefinition.ViewKind) -> AnyObject {
         preconditionFailure("TODO")
     }

Sources/OpenSwiftUICore/Render/DisplayList/DisplayListViewRenderer.swift

@@ -22,12 +22,23 @@ extension DisplayList {
     final public class ViewRenderer {
         package struct Environment: Equatable {
             package var contentsScale: CGFloat
-
+            
+            #if os(macOS)
+            package var opaqueBackground: Bool = false
+            #endif
+            
             package static let invalid = Environment(contentsScale: .zero)
 
             package init(contentsScale: CGFloat) {
                 self.contentsScale = contentsScale
             }
+            
+            #if os(macOS)
+            package init(contentsScale: CGFloat, opaqueBackground: Bool) {
+                self.contentsScale = contentsScale
+                self.opaqueBackground = opaqueBackground
+            }
+            #endif
         }
 
         let platform: DisplayList.ViewUpdater.Platform

Sources/OpenSwiftUICore/Render/RendererLeafView.swift

@@ -139,8 +139,14 @@ private struct LeafDisplayList<V>: StatefulRule, CustomStringConvertible where V
         )
         item.canonicalize(options: options)
         #if _OPENSWIFTUI_SWIFTUI_RENDER
+        
         // FIXME: Remove me after Layout system is implemented
+        #if os(macOS)
+        item.frame = CGRect(x: 0, y: 0, width: 500, height: 300)
+        #elseif os(iOS)
         item.frame = CGRect(x: 0, y: 100.333, width: 402, height: 739)
+        #endif
+        
         #endif
         value = DisplayList(item)
     }