added interactiveDismissDisabled modifier

Author: MiaKoring

Examples/Sources/WindowingExample/WindowingApp.swift

@@ -133,6 +133,7 @@ struct SheetDemo: View {
                 }
                 .sheet(isPresented: $showNextChild) {
                     DoubleNestedSheetBody(dismissParent: { dismiss() })
+                        .interactiveDismissDisabled()
                 }
                 Button("dismiss parent sheet") {
                     dismissParent()

Sources/AppKitBackend/AppKitBackend.swift

@@ -1766,6 +1766,10 @@ public final class AppKitBackend: AppBackend {
             sheet.contentView = container
         }
     }
+
+    public func setInteractiveDismissDisabled(for sheet: NSCustomSheet, to disabled: Bool) {
+        sheet.interactiveDismissDisabled = disabled
+    }
 }
 
 public final class NSCustomSheet: NSCustomWindow, NSWindowDelegate, SheetImplementation {
@@ -1777,13 +1781,17 @@ public final class NSCustomSheet: NSCustomWindow, NSWindowDelegate, SheetImpleme
     }
     public var onDismiss: (() -> Void)?
 
+    public var interactiveDismissDisabled: Bool = false
+
     public func dismiss() {
         onDismiss?()
         self.contentViewController?.dismiss(self)
     }
 
     @objc override public func cancelOperation(_ sender: Any?) {
-        dismiss()
+        if !interactiveDismissDisabled {
+            dismiss()
+        }
     }
 }
 

Sources/SwiftCrossUI/Backend/AppBackend.swift

@@ -677,6 +677,18 @@ public protocol AppBackend: Sendable {
     ///   - color: rgba background color
     func setPresentationBackground(of sheet: Sheet, to color: Color)
 
+    /// Sets the interactive dismissablility of a sheet.
+    /// when disabled the sheet can only be closed programmatically,
+    /// not through users swiping, escape keys or similar.
+    ///
+    /// This method is called when the sheet content has a `interactiveDismissDisabled`
+    /// modifier applied at its top level.
+    ///
+    /// - Parameters:
+    ///   - sheet: The sheet to apply the detents to.
+    ///   - disabled: wether its disabled
+    func setInteractiveDismissDisabled(for sheet: Sheet, to disabled: Bool)
+
     /// Presents an 'Open file' dialog to the user for selecting files or
     /// folders.
     ///
@@ -1289,4 +1301,8 @@ extension AppBackend {
     func setPresentationBackground(of sheet: Sheet, to color: Color) {
         todo()
     }
+
+    func setInteractiveDismissDisabled(for sheet: Sheet, to disabled: Bool) {
+        todo()
+    }
 }

Sources/SwiftCrossUI/ViewGraph/PreferenceValues.swift

@@ -6,7 +6,8 @@ public struct PreferenceValues: Sendable {
         presentationDetents: nil,
         presentationCornerRadius: nil,
         presentationDragIndicatorVisibility: nil,
-        presentationBackground: nil
+        presentationBackground: nil,
+        interactiveDismissDisabled: nil
     )
 
     public var onOpenURL: (@Sendable @MainActor (URL) -> Void)?
@@ -17,23 +18,28 @@ public struct PreferenceValues: Sendable {
     /// The corner radius for a sheet presentation. Only applies to the top-level view in a sheet.
     public var presentationCornerRadius: Double?
 
-    /// The drag indicator visibiity for a sheet presentation. Only applies to the top-level view in a sheet.
+    /// The drag indicator visibility for a sheet presentation. Only applies to the top-level view in a sheet.
     public var presentationDragIndicatorVisibility: PresentationDragIndicatorVisibility?
 
+    /// The backgroundcolor of a sheet. Only applies to the top-level view in a sheet
     public var presentationBackground: Color?
 
+    public var interactiveDismissDisabled: Bool?
+
     public init(
         onOpenURL: (@Sendable @MainActor (URL) -> Void)?,
         presentationDetents: [PresentationDetent]? = nil,
         presentationCornerRadius: Double? = nil,
         presentationDragIndicatorVisibility: PresentationDragIndicatorVisibility? = nil,
-        presentationBackground: Color?
+        presentationBackground: Color? = nil,
+        interactiveDismissDisabled: Bool? = nil
     ) {
         self.onOpenURL = onOpenURL
         self.presentationDetents = presentationDetents
         self.presentationCornerRadius = presentationCornerRadius
         self.presentationDragIndicatorVisibility = presentationDragIndicatorVisibility
         self.presentationBackground = presentationBackground
+        self.interactiveDismissDisabled = interactiveDismissDisabled
     }
 
     public init(merging children: [PreferenceValues]) {
@@ -53,5 +59,6 @@ public struct PreferenceValues: Sendable {
         presentationCornerRadius = children.first?.presentationCornerRadius
         presentationDragIndicatorVisibility = children.first?.presentationDragIndicatorVisibility
         presentationBackground = children.first?.presentationBackground
+        interactiveDismissDisabled = children.first?.interactiveDismissDisabled
     }
 }

Sources/SwiftCrossUI/Views/Modifiers/Style/PresentationModifiers.swift renamed to Sources/SwiftCrossUI/Views/Modifiers/PresentationModifiers.swift

@@ -38,4 +38,8 @@ extension View {
     public func presentationBackground(_ color: Color) -> some View {
         preference(key: \.presentationBackground, value: color)
     }
+
+    public func interactiveDismissDisabled(_ isDisabled: Bool = true) -> some View {
+        preference(key: \.interactiveDismissDisabled, value: isDisabled)
+    }
 }

Sources/SwiftCrossUI/Views/Modifiers/SheetModifier.swift

@@ -120,6 +120,10 @@ struct SheetModifier<Content: View, SheetContent: View>: TypeSafeView {
                 backend.setPresentationBackground(of: sheet, to: presentationBackground)
             }
 
+            if let interactiveDismissDisabled = preferences.interactiveDismissDisabled {
+                backend.setInteractiveDismissDisabled(for: sheet, to: interactiveDismissDisabled)
+            }
+
             backend.showSheet(
                 sheet,
                 window: .some(environment.window! as! Backend.Window)

Sources/UIKitBackend/UIKitBackend+Sheet.swift

@@ -109,6 +109,10 @@ extension UIKitBackend {
     public func setPresentationBackground(of sheet: CustomSheet, to color: Color) {
         sheet.view.backgroundColor = color.uiColor
     }
+
+    public func setInteractiveDismissDisabled(for sheet: Sheet, to disabled: Bool) {
+        sheet.isModalInPresentation = disabled
+    }
 }
 
 public final class CustomSheet: UIViewController, SheetImplementation {