Add ToolbarView extension

Sources/Portico/Extensions/ToolbarView+Extras.swift

@@ -0,0 +1,69 @@
+import Adw
+import Gtk
+
+extension ToolbarView {
+    /// Creates a toolbar view with content and optional top and bottom bars.
+    ///
+    /// The content closure's first view is mounted as the content widget. Every
+    /// view returned by the top and bottom closures is mounted directly as a
+    /// corresponding toolbar bar.
+    ///
+    /// - Parameters:
+    ///   - content: A closure producing the content widget.
+    ///   - top: A closure producing widgets to add as top bars.
+    ///   - bottom: A closure producing widgets to add as bottom bars.
+    public init(
+        @ViewBuilder content: () -> [AnyView],
+        @ViewBuilder top: () -> [AnyView] = { [] },
+        @ViewBuilder bottom: () -> [AnyView] = { [] }
+    ) {
+        let contentViews = content()
+        let topViews = top()
+        let bottomViews = bottom()
+
+        self.init()
+        if let contentView = contentViews.first {
+            self = self.appending { toolbar, context in
+                toolbar.setContent(content: contentView.makeWidget(context))
+            }
+        }
+        for view in topViews {
+            self = self.appending { toolbar, context in
+                toolbar.addTopBar(widget: view.makeWidget(context))
+            }
+        }
+        for view in bottomViews {
+            self = self.appending { toolbar, context in
+                toolbar.addBottomBar(widget: view.makeWidget(context))
+            }
+        }
+    }
+
+    /// Adds widgets produced by `content` as top bars.
+    ///
+    /// - Parameter content: A closure producing widgets to add as top bars.
+    /// - Returns: A copy of this view with the bars added at mount time.
+    public func top(@ViewBuilder _ content: () -> [AnyView]) -> Self {
+        var view = self
+        for child in content() {
+            view = view.appending { toolbar, context in
+                toolbar.addTopBar(widget: child.makeWidget(context))
+            }
+        }
+        return view
+    }
+
+    /// Adds widgets produced by `content` as bottom bars.
+    ///
+    /// - Parameter content: A closure producing widgets to add as bottom bars.
+    /// - Returns: A copy of this view with the bars added at mount time.
+    public func bottom(@ViewBuilder _ content: () -> [AnyView]) -> Self {
+        var view = self
+        for child in content() {
+            view = view.appending { toolbar, context in
+                toolbar.addBottomBar(widget: child.makeWidget(context))
+            }
+        }
+        return view
+    }
+}