added presentationBackground

Author: MiaKoring

Examples/Sources/WindowingExample/WindowingApp.swift

@@ -85,30 +85,29 @@ struct SheetDemo: View {
             SheetBody()
                 .presentationDetents([.height(150), .medium, .large])
                 .presentationDragIndicatorVisibility(.visible)
+                .presentationBackground(.blue)
         }
         .sheet(isPresented: $isShortTermSheetPresented) {
             Text("I'm only here for 5s")
                 .padding(20)
                 .presentationDetents([.height(150), .medium, .large])
                 .presentationCornerRadius(10)
+                .presentationBackground(.red)
         }
     }
 
     struct SheetBody: View {
         @State var isPresented = false
 
         var body: some View {
-            ZStack {
-                Color.blue
-                VStack {
-                    Text("Nice sheet content")
-                        .padding(20)
-                    Button("I want more sheet") {
-                        isPresented = true
-                        print("should get presented")
-                    }
-                    Spacer()
+            VStack {
+                Text("Nice sheet content")
+                    .padding(20)
+                Button("I want more sheet") {
+                    isPresented = true
+                    print("should get presented")
                 }
+                Spacer()
             }
             .sheet(isPresented: $isPresented) {
                 print("nested sheet dismissed")

Sources/AppKitBackend/AppKitBackend.swift

@@ -1708,8 +1708,8 @@ public final class AppKitBackend: AppBackend {
     ) {
         let contentSize = naturalSize(of: content)
 
-        let width = max(contentSize.x, 80)
-        let height = max(contentSize.y, 80)
+        let width = max(contentSize.x, 10)
+        let height = max(contentSize.y, 10)
         sheet.setContentSize(NSSize(width: width, height: height))
 
         sheet.contentView = content
@@ -1734,6 +1734,38 @@ public final class AppKitBackend: AppBackend {
             NSApplication.shared.stopModal()
         }
     }
+
+    public func setPresentationBackground(of sheet: NSCustomSheet, to color: Color) {
+        let backgroundView = NSView()
+        backgroundView.wantsLayer = true
+        backgroundView.layer?.backgroundColor = color.nsColor.cgColor
+
+        if let existingContentView = sheet.contentView {
+            let container = NSView()
+            container.translatesAutoresizingMaskIntoConstraints = false
+
+            container.addSubview(backgroundView)
+            backgroundView.translatesAutoresizingMaskIntoConstraints = false
+            backgroundView.leadingAnchor.constraint(equalTo: container.leadingAnchor).isActive =
+                true
+            backgroundView.topAnchor.constraint(equalTo: container.topAnchor).isActive = true
+            backgroundView.trailingAnchor.constraint(equalTo: container.trailingAnchor).isActive =
+                true
+            backgroundView.bottomAnchor.constraint(equalTo: container.bottomAnchor).isActive = true
+
+            container.addSubview(existingContentView)
+            existingContentView.translatesAutoresizingMaskIntoConstraints = false
+            existingContentView.leadingAnchor.constraint(equalTo: container.leadingAnchor)
+                .isActive = true
+            existingContentView.topAnchor.constraint(equalTo: container.topAnchor).isActive = true
+            existingContentView.trailingAnchor.constraint(equalTo: container.trailingAnchor)
+                .isActive = true
+            existingContentView.bottomAnchor.constraint(equalTo: container.bottomAnchor).isActive =
+                true
+
+            sheet.contentView = container
+        }
+    }
 }
 
 public final class NSCustomSheet: NSCustomWindow, NSWindowDelegate, SheetImplementation {

Sources/SwiftCrossUI/Backend/AppBackend.swift

@@ -654,8 +654,28 @@ public protocol AppBackend: Sendable {
     ///   - detents: An array of detents that the sheet can be resized to.
     func setPresentationDetents(of sheet: Sheet, to detents: [PresentationDetent])
 
+    /// Sets the visibility for a sheet presentation.
+    ///
+    /// This method is called when the sheet content has a `presentationDragIndicatorVisibility`
+    /// modifier applied at its top level.
+    ///
+    /// - Parameters:
+    ///   - sheet: The sheet to apply the detents to.
+    ///   - visibility: visibility of the drag indicator (visible or hidden)
     func setPresentationDragIndicatorVisibility(
-        of sheet: Sheet, to visibility: PresentationDragIndicatorVisibility)
+        of sheet: Sheet,
+        to visibility: PresentationDragIndicatorVisibility
+    )
+
+    /// Sets the background color for a sheet presentation.
+    ///
+    /// This method is called when the sheet content has a `presentationBackground`
+    /// modifier applied at its top level.
+    ///
+    /// - Parameters:
+    ///   - sheet: The sheet to apply the detents to.
+    ///   - color: rgba background color
+    func setPresentationBackground(of sheet: Sheet, to color: Color)
 
     /// Presents an 'Open file' dialog to the user for selecting files or
     /// folders.
@@ -786,9 +806,11 @@ extension AppBackend {
     }
 
     private func ignored(_ function: String = #function) {
-        print(
-            "\(type(of: self)): \(function) is being ignored\nConsult at the documentation for further information."
-        )
+        #if DEBUG
+            print(
+                "\(type(of: self)): \(function) is being ignored\nConsult at the documentation for further information."
+            )
+        #endif
     }
 
     // MARK: System
@@ -1263,4 +1285,8 @@ extension AppBackend {
     ) {
         ignored()
     }
+
+    func setPresentationBackground(of sheet: Sheet, to color: Color) {
+        todo()
+    }
 }

Sources/SwiftCrossUI/ViewGraph/PreferenceValues.swift

@@ -4,7 +4,9 @@ public struct PreferenceValues: Sendable {
     public static let `default` = PreferenceValues(
         onOpenURL: nil,
         presentationDetents: nil,
-        presentationCornerRadius: nil
+        presentationCornerRadius: nil,
+        presentationDragIndicatorVisibility: nil,
+        presentationBackground: nil
     )
 
     public var onOpenURL: (@Sendable @MainActor (URL) -> Void)?
@@ -15,17 +17,23 @@ 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.
     public var presentationDragIndicatorVisibility: PresentationDragIndicatorVisibility?
 
+    public var presentationBackground: Color?
+
     public init(
         onOpenURL: (@Sendable @MainActor (URL) -> Void)?,
         presentationDetents: [PresentationDetent]? = nil,
         presentationCornerRadius: Double? = nil,
-        presentationDragIndicatorVisibility: PresentationDragIndicatorVisibility? = nil
+        presentationDragIndicatorVisibility: PresentationDragIndicatorVisibility? = nil,
+        presentationBackground: Color?
     ) {
         self.onOpenURL = onOpenURL
         self.presentationDetents = presentationDetents
         self.presentationCornerRadius = presentationCornerRadius
+        self.presentationDragIndicatorVisibility = presentationDragIndicatorVisibility
+        self.presentationBackground = presentationBackground
     }
 
     public init(merging children: [PreferenceValues]) {
@@ -44,5 +52,6 @@ public struct PreferenceValues: Sendable {
         presentationDetents = children.first?.presentationDetents
         presentationCornerRadius = children.first?.presentationCornerRadius
         presentationDragIndicatorVisibility = children.first?.presentationDragIndicatorVisibility
+        presentationBackground = children.first?.presentationBackground
     }
 }

Sources/SwiftCrossUI/Views/Modifiers/SheetModifier.swift

@@ -111,6 +111,10 @@ struct SheetModifier<Content: View, SheetContent: View>: TypeSafeView {
                     of: sheet, to: presentationDragIndicatorVisibility)
             }
 
+            if let presentationBackground = preferences.presentationBackground {
+                backend.setPresentationBackground(of: sheet, to: presentationBackground)
+            }
+
             backend.showSheet(
                 sheet,
                 window: .some(environment.window! as! Backend.Window)

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

@@ -34,4 +34,8 @@ extension View {
     ) -> some View {
         preference(key: \.presentationDragIndicatorVisibility, value: visibility)
     }
+
+    public func presentationBackground(_ color: Color) -> some View {
+        preference(key: \.presentationBackground, value: color)
+    }
 }

Sources/UIKitBackend/UIKitBackend+Sheet.swift

@@ -97,6 +97,10 @@ extension UIKitBackend {
             #endif
         }
     }
+
+    public func setPresentationBackground(of sheet: CustomSheet, to color: Color) {
+        sheet.view.backgroundColor = color.uiColor
+    }
 }
 
 public final class CustomSheet: UIViewController, SheetImplementation {