Update Gesture system infra

Package.swift

@@ -161,6 +161,7 @@ let linkCoreUI = envBoolValue("LINK_COREUI", default: buildForDarwinPlatform &&
 let linkCoreSVG = envBoolValue("LINK_CORESVG", default: buildForDarwinPlatform && !isSPIBuild)
 let linkSFSymbols = envBoolValue("LINK_SFSYMBOLS", default: buildForDarwinPlatform && !isSPIBuild)
 let linkBacklightServices = envBoolValue("LINK_BACKLIGHTSERVICES", default: buildForDarwinPlatform && !isSPIBuild)
+let linkGestures = envBoolValue("LINK_GESTURES", default: buildForDarwinPlatform && !isSPIBuild && releaseVersion >= 2025)
 // This should be disabled for UI test target due to link issue of Testing.
 // Only enable for non-UI test targets.
 let linkTesting = envBoolValue("LINK_TESTING")
@@ -289,6 +290,9 @@ if linkBacklightServices {
         )
     )
 }
+if linkGestures {
+    sharedSwiftSettings.append(.define("OPENSWIFTUI_LINK_GESTURES"))
+}
 
 if swiftUIRenderCondition {
     sharedCSettings.append(.define("OPENSWIFTUI_SWIFTUI_RENDERER", .when(platforms: .darwinPlatforms)))
@@ -419,6 +423,10 @@ extension Target {
         )
     }
 
+    func addGesturesSettings() {
+        dependencies.append(.product(name: "Gestures", package: "DarwinPrivateFrameworks"))
+    }
+
     func addOpenCombineSettings() {
         dependencies.append(.product(name: "OpenCombine", package: "OpenCombine"))
         dependencies.append(.product(name: "OpenCombineFoundation", package: "OpenCombine"))
@@ -837,12 +845,24 @@ if renderBoxCondition {
     openSwiftUIBridgeTestTarget.addRBSettings()
 }
 
-if attributeGraphCondition || renderBoxCondition {
+if linkGestures {
+    openSwiftUICoreTarget.addGesturesSettings()
+    openSwiftUITarget.addGesturesSettings()
+
+    openSwiftUISPITestTarget.addGesturesSettings()
+    openSwiftUICoreTestTarget.addGesturesSettings()
+    openSwiftUITestTarget.addGesturesSettings()
+    openSwiftUICompatibilityTestTarget.addGesturesSettings()
+    openSwiftUIBridgeTestTarget.addGesturesSettings()
+}
+
+if attributeGraphCondition || renderBoxCondition || linkGestures {
     let release = EnvManager.shared.withDomain("DarwinPrivateFrameworks") {
         envIntValue("TARGET_RELEASE", default: 2024)
     }
     package.platforms = switch release {
         case 2024: [.iOS(.v18), .macOS(.v15), .macCatalyst(.v18), .tvOS(.v18), .watchOS(.v10), .visionOS(.v2)]
+        case 2025: [.iOS("26.0"), .macOS("26.0"), .macCatalyst("26.0"), .tvOS("26.0"), .watchOS("26.0"), .visionOS("26.0")]
         default: nil
     }
 } else {
@@ -876,7 +896,7 @@ if useLocalDeps {
         .package(path: "../OpenRenderBox"),
         .package(path: "../OpenObservation"),
     ]
-    if attributeGraphCondition || renderBoxCondition || linkCoreUI || linkCoreSVG || linkSFSymbols || linkBacklightServices {
+    if attributeGraphCondition || renderBoxCondition || linkCoreUI || linkCoreSVG || linkSFSymbols || linkBacklightServices || linkGestures {
         dependencies.append(.package(path: "../DarwinPrivateFrameworks"))
     }
     package.dependencies += dependencies
@@ -888,7 +908,7 @@ if useLocalDeps {
         .package(url: "https://github.com/OpenSwiftUIProject/OpenRenderBox", branch: "main"),
         .package(url: "https://github.com/OpenSwiftUIProject/OpenObservation", branch: "main"),
     ]
-    if attributeGraphCondition || renderBoxCondition || linkCoreUI || linkCoreSVG || linkSFSymbols {
+    if attributeGraphCondition || renderBoxCondition || linkCoreUI || linkCoreSVG || linkSFSymbols || linkGestures {
         dependencies.append(.package(url: "https://github.com/OpenSwiftUIProject/DarwinPrivateFrameworks.git", branch: "main"))
     }
     package.dependencies += dependencies

Sources/OpenSwiftUICore/Data/Preference/PreferenceWritingModifier.swift

@@ -112,10 +112,6 @@ extension PreferencesOutputs {
     }
 }
 
-// TODO: - View + truePreference
-
-// TODO: - Gesture + truePreference
-
 // MARK: - HostPreferencesWriter
 
 private struct HostPreferencesWriter<K>: StatefulRule, AsyncAttribute, CustomStringConvertible where K: PreferenceKey {
@@ -167,3 +163,62 @@ private struct HostPreferencesWriter<K>: StatefulRule, AsyncAttribute, CustomStr
         "Preference: \(K.readableName)"
     }
 }
+
+// MARK: - View + truePreference
+
+@available(OpenSwiftUI_v1_0, *)
+extension View {
+    @MainActor
+    @preconcurrency
+    package func truePreference<K>(_ key: K.Type = K.self) -> some View where K: PreferenceKey, K.Value == Bool {
+        modifier(TruePreferenceWritingModifier<K>())
+    }
+}
+
+// MARK: - TruePreferenceWritingModifier
+
+private struct TruePreferenceWritingModifier<K>: ViewModifier, MultiViewModifier, PrimitiveViewModifier where K: PreferenceKey, K.Value == Bool {
+    nonisolated static func _makeView(
+        modifier: _GraphValue<Self>,
+        inputs: _ViewInputs,
+        body: @escaping (_Graph, _ViewInputs) -> _ViewOutputs
+    ) -> _ViewOutputs {
+        var outputs = body(_Graph(), inputs)
+        outputs.preferences.makePreferenceWriter(
+            inputs: inputs.preferences,
+            key: K.self,
+            value: inputs.intern(true, id: .trueValue)
+        )
+        return outputs
+    }
+}
+
+// MARK: - Gesture + truePreference
+
+extension Gesture {
+    package func truePreference<K>(_ key: K.Type = K.self) -> some Gesture<Value> where K: PreferenceKey, K.Value == Bool {
+        modifier(TruePreferenceWritingGestureModifier<K, Value>())
+    }
+}
+
+// MARK: - TruePreferenceWritingGestureModifier
+
+private struct TruePreferenceWritingGestureModifier<K, GestureValue>: GestureModifier where K: PreferenceKey, K.Value == Bool {
+    static func _makeGesture(
+        modifier: _GraphValue<TruePreferenceWritingGestureModifier<K, GestureValue>>,
+        inputs: _GestureInputs,
+        body: (_GestureInputs) -> _GestureOutputs<GestureValue>
+    ) -> _GestureOutputs<GestureValue> {
+        var outputs = body(inputs)
+        outputs.preferences.makePreferenceWriter(
+            inputs: inputs.preferences,
+            key: K.self,
+            value: inputs.intern(true, id: .trueValue)
+        )
+        return outputs
+    }
+
+    typealias Value = GestureValue
+
+    typealias BodyValue = GestureValue
+}

Sources/OpenSwiftUICore/Data/Update.swift

@@ -231,12 +231,12 @@ package enum Update {
 // FIXME
 package enum CustomEventTrace {
     package enum ActionEventType {
-        package enum Reason {
-            case onAppear
-            case onChange
-            case onDisappear
-            case gesture
-            case didReleaseButton
+        package enum Reason: UInt32 {
+            case onAppear = 65
+            case onChange = 67
+            case onDisappear = 68
+            case gesture = 71
+            case didReleaseButton = 82
         }
     }
 }

Sources/OpenSwiftUICore/Event/Gesture/AnyGesture.swift

@@ -2,12 +2,13 @@
 //  AnyGesture.swift
 //  OpenSwiftUICore
 //
+//  Audited for 6.5.4
 //  Status: Complete
 //  ID: 9726BF9F3BA5F571B5F201AD7C8C86F0 (SwiftUICore)
 
 import OpenAttributeGraphShims
 
-// MARK: - AnyGesture [6.5.4]
+// MARK: - AnyGesture
 
 /// A type-erased gesture.
 @available(OpenSwiftUI_v1_0, *)