improved sheet rendering

Author: MiaKoring

Examples/Sources/WindowingExample/WindowingApp.swift

@@ -83,6 +83,8 @@ struct SheetDemo: View {
             print("sheet dismissed")
         } content: {
             SheetBody()
+                .frame(maxWidth: 200, maxHeight: 100)
+                .presentationDetents([.height(150), .medium, .large])
         }
         .sheet(isPresented: $isShortTermSheetPresented) {
             Text("I'm only here for 5s")
@@ -105,6 +107,7 @@ struct SheetDemo: View {
                         isPresented = true
                         print("should get presented")
                     }
+                    Spacer()
                 }
             }
             .sheet(isPresented: $isPresented) {

Sources/AppKitBackend/AppKitBackend.swift

@@ -1736,7 +1736,13 @@ public final class AppKitBackend: AppBackend {
     }
 }
 
-public final class NSCustomSheet: NSCustomWindow, NSWindowDelegate {
+public final class NSCustomSheet: NSCustomWindow, NSWindowDelegate, SheetImplementation {
+    public var size: SIMD2<Int> {
+        guard let size = self.contentView?.frame.size else {
+            return SIMD2(x: 0, y: 0)
+        }
+        return SIMD2(x: Int(size.width), y: Int(size.height))
+    }
     public var onDismiss: (() -> Void)?
 
     public func dismiss() {

Sources/SwiftCrossUI/Backend/AppBackend.swift

@@ -47,7 +47,7 @@ public protocol AppBackend: Sendable {
     associatedtype Menu
     associatedtype Alert
     associatedtype Path
-    associatedtype Sheet
+    associatedtype Sheet: SheetImplementation
 
     /// Creates an instance of the backend.
     init()
@@ -771,6 +771,10 @@ extension AppBackend {
     }
 }
 
+public protocol SheetImplementation {
+    var size: SIMD2<Int> { get }
+}
+
 extension AppBackend {
     /// Used by placeholder implementations of backend methods.
     private func todo(_ function: String = #function) -> Never {

Sources/SwiftCrossUI/Views/Modifiers/SheetModifier.swift

@@ -71,27 +71,26 @@ struct SheetModifier<Content: View, SheetContent: View>: TypeSafeView {
         )
 
         if isPresented.wrappedValue && children.sheet == nil {
+            //let sheetSize = dryRunResult.size.idealSize
+
+            let sheet = backend.createSheet()
+
             let dryRunResult = children.sheetContentNode.update(
                 with: sheetContent(),
-                proposedSize: proposedSize,
+                proposedSize: sheet.size,
                 environment: environment,
                 dryRun: true
             )
 
-            // Extract preferences from the sheet content
             let preferences = dryRunResult.preferences
 
-            let sheetSize = dryRunResult.size.idealSize
-
             let _ = children.sheetContentNode.update(
                 with: sheetContent(),
-                proposedSize: sheetSize,
+                proposedSize: sheet.size,
                 environment: environment,
                 dryRun: false
             )
 
-            let sheet = backend.createSheet()
-
             backend.updateSheet(
                 sheet,
                 content: children.sheetContentNode.widget.into(),

Sources/UIKitBackend/UIKitBackend+Sheet.swift

@@ -83,7 +83,12 @@ extension UIKitBackend {
     }
 }
 
-public final class CustomSheet: UIViewController {
+public final class CustomSheet: UIViewController, SheetImplementation {
+    public var size: SIMD2<Int> {
+        let size = view.frame.size
+        return SIMD2(x: Int(size.width), y: Int(size.height))
+    }
+
     var onDismiss: (() -> Void)?
 
     public override func viewDidLoad() {