Add SafeWrapper

Sources/View/SafeWrapper.swift

@@ -0,0 +1,69 @@
+//
+//  SafeWrapper.swift
+//  Meta
+//
+//  Created by david-swift on 02.02.26.
+//
+
+/// Wrap a widget but keep its pointer.
+struct SafeWrapper: ConvenienceWidget {
+
+    /// The custom code to edit the wrapper.
+    /// The pointer is the one of the child widget.
+    var modify: (ViewStorage, WidgetData, Bool) -> Void
+    /// The wrapped view.
+    var content: AnyView
+
+    /// The view storage.
+    /// - Parameters:
+    ///     - data: Modify views before being updated.
+    ///     - type: The view render data type.
+    /// - Returns: The view storage.
+    func container<Data>(
+        data: WidgetData,
+        type: Data.Type
+    ) -> ViewStorage where Data: ViewRenderData {
+        let contentStorage = content.storage(data: data, type: type)
+        let storage = ViewStorage(contentStorage.pointer, content: [.mainContent: [contentStorage]])
+        modify(storage, data, true)
+        return storage
+    }
+
+    /// Update the stored content.
+    /// - Parameters:
+    ///     - storage: The storage to update.
+    ///     - data: Modify views before being updated
+    ///     - updateProperties: Whether to update the view's properties.
+    ///     - type: The view render data type.
+    func update<Data>(
+        _ storage: ViewStorage,
+        data: WidgetData,
+        updateProperties: Bool,
+        type: Data.Type
+    ) where Data: ViewRenderData {
+        if let contentStorage = storage.content[.mainContent]?.first {
+            content.updateStorage(contentStorage, data: data, updateProperties: updateProperties, type: type)
+        }
+        modify(storage, data, updateProperties)
+    }
+
+}
+
+/// Extend any view.
+extension AnyView {
+
+    /// Wrap a widget but keep its pointer.
+    /// - Parameter modify: Modify the storage. The boolean indicates whether state in parent views changed.
+    /// - Returns: A view.
+    public func wrap(_ modify: @escaping (ViewStorage, WidgetData, Bool) -> Void) -> AnyView {
+        SafeWrapper(modify: modify, content: self)
+    }
+
+    /// Wrap a widget but keep its pointer.
+    /// - Parameter modify: Modify the storage. The boolean indicates whether state in parent views changed.
+    /// - Returns: A view.
+    public func wrap(_ modify: @escaping (ViewStorage, Bool) -> Void) -> AnyView {
+        wrap { storage, _, updateProperties in modify(storage, updateProperties) }
+    }
+
+}