fix(editor): activate text editor for keyboard input

Sources/SaplingApp/SaplingApp.swift

@@ -9,8 +9,16 @@ import SaplingEditor
 import SaplingRenderer
 import SaplingUI
 
+#if os(macOS)
+import AppKit
+#endif
+
 @main
 struct SaplingApplication: App {
+    #if os(macOS)
+    @NSApplicationDelegateAdaptor(SaplingAppDelegate.self) private var appDelegate
+    #endif
+
     @StateObject private var model = SaplingAppModel(dependencies: .live())
 
     var body: some Scene {
@@ -33,6 +41,15 @@ struct SaplingApplication: App {
     }
 }
 
+#if os(macOS)
+private final class SaplingAppDelegate: NSObject, NSApplicationDelegate {
+    func applicationDidFinishLaunching(_ notification: Notification) {
+        NSApp.setActivationPolicy(.regular)
+        NSApp.activate(ignoringOtherApps: true)
+    }
+}
+#endif
+
 @MainActor
 private final class SaplingAppModel: ObservableObject {
     @Published var workspace: Workspace

Sources/SaplingEditor/HybridMarkdownEditor.swift

@@ -150,7 +150,7 @@ private struct NativeMarkdownTextView: NSViewRepresentable {
         layoutManager.addTextContainer(textContainer)
         textStorage.addLayoutManager(layoutManager)
 
-        let textView = NSTextView(frame: scrollView.contentView.bounds, textContainer: textContainer)
+        let textView = EditorTextView(frame: scrollView.contentView.bounds, textContainer: textContainer)
         textView.autoresizingMask = [.width]
         textView.minSize = NSSize(width: 0, height: scrollView.contentSize.height)
         textView.maxSize = NSSize(width: CGFloat.greatestFiniteMagnitude, height: CGFloat.greatestFiniteMagnitude)
@@ -160,6 +160,8 @@ private struct NativeMarkdownTextView: NSViewRepresentable {
         textView.delegate = context.coordinator
         textView.string = text
         textView.isRichText = false
+        textView.isEditable = true
+        textView.isSelectable = true
         textView.isAutomaticQuoteSubstitutionEnabled = false
         textView.isAutomaticDashSubstitutionEnabled = false
         textView.isAutomaticTextReplacementEnabled = false
@@ -179,6 +181,7 @@ private struct NativeMarkdownTextView: NSViewRepresentable {
         scrollView.editorTextView = textView
         scrollView.updateEditorInsets()
         context.coordinator.applyHybridAttributes(to: textView)
+        context.coordinator.requestInitialFocus(for: textView)
         return scrollView
     }
 
@@ -199,6 +202,7 @@ private struct NativeMarkdownTextView: NSViewRepresentable {
         }
 
         context.coordinator.applyHybridAttributes(to: textView)
+        context.coordinator.requestInitialFocus(for: textView)
     }
 
     final class Coordinator: NSObject, NSTextViewDelegate {
@@ -206,6 +210,7 @@ private struct NativeMarkdownTextView: NSViewRepresentable {
         private var programmaticUpdateDepth = 0
         private var lastStyledText: String?
         private var lastStyledActiveLineIndex: Int?
+        private var didFocusTextView = false
 
         init(_ parent: NativeMarkdownTextView) {
             self.parent = parent
@@ -263,6 +268,24 @@ private struct NativeMarkdownTextView: NSViewRepresentable {
             }
         }
 
+        func requestInitialFocus(for textView: NSTextView) {
+            guard !didFocusTextView else { return }
+
+            DispatchQueue.main.async { [weak self, weak textView] in
+                guard let self,
+                      let textView,
+                      let window = textView.window,
+                      !self.didFocusTextView
+                else { return }
+
+                if window.firstResponder !== textView {
+                    window.makeFirstResponder(textView)
+                }
+
+                self.didFocusTextView = window.firstResponder === textView
+            }
+        }
+
         func performProgrammaticUpdate(_ updates: () -> Void) {
             programmaticUpdateDepth += 1
             defer {
@@ -281,6 +304,12 @@ private struct NativeMarkdownTextView: NSViewRepresentable {
     }
 }
 
+private final class EditorTextView: NSTextView {
+    override var acceptsFirstResponder: Bool {
+        true
+    }
+}
+
 private final class ComfortableEditorScrollView: NSScrollView {
     weak var editorTextView: NSTextView?
 
@@ -323,6 +352,7 @@ private struct NativeMarkdownTextView: UIViewRepresentable {
         textView.textContainerInset = UIEdgeInsets(top: 28, left: 24, bottom: 28, right: 24)
         textView.backgroundColor = .systemBackground
         context.coordinator.applyHybridAttributes(to: textView)
+        context.coordinator.requestInitialFocus(for: textView)
         return textView
     }
 
@@ -334,6 +364,7 @@ private struct NativeMarkdownTextView: UIViewRepresentable {
             }
         }
         context.coordinator.applyHybridAttributes(to: textView)
+        context.coordinator.requestInitialFocus(for: textView)
     }
 
     final class Coordinator: NSObject, UITextViewDelegate {
@@ -341,6 +372,7 @@ private struct NativeMarkdownTextView: UIViewRepresentable {
         private var programmaticUpdateDepth = 0
         private var lastStyledText: String?
         private var lastStyledActiveLineIndex: Int?
+        private var didFocusTextView = false
 
         init(_ parent: NativeMarkdownTextView) {
             self.parent = parent
@@ -395,6 +427,20 @@ private struct NativeMarkdownTextView: UIViewRepresentable {
             updates()
         }
 
+        func requestInitialFocus(for textView: UITextView) {
+            guard !didFocusTextView else { return }
+
+            DispatchQueue.main.async { [weak self, weak textView] in
+                guard let self,
+                      let textView,
+                      textView.window != nil,
+                      !self.didFocusTextView
+                else { return }
+
+                self.didFocusTextView = textView.becomeFirstResponder()
+            }
+        }
+
         private var isPerformingProgrammaticUpdate: Bool {
             programmaticUpdateDepth > 0
         }