Add font picker

Author: intitni

Tool/Sources/SharedUIComponents/FontPicker.swift

@@ -0,0 +1,69 @@
+import AppKit
+import Foundation
+import Preferences
+import SwiftUI
+
+public struct FontPicker: View {
+    @Binding var font: NSFont
+    @State var fontManagerDelegate: FontManagerDelegate?
+
+    public init(font: Binding<NSFont>) {
+        _font = font
+    }
+
+    public var body: some View {
+        Button {
+            if NSFontPanel.shared.isVisible {
+                NSFontPanel.shared.orderOut(nil)
+            }
+
+            self.fontManagerDelegate = FontManagerDelegate(font: font) {
+                self.font = $0
+            }
+            NSFontManager.shared.target = self.fontManagerDelegate
+            NSFontPanel.shared.setPanelFont(self.font, isMultiple: false)
+            NSFontPanel.shared.orderBack(nil)
+        } label: {
+            HStack {
+                    Text(font.fontName)
+                        + Text(" - ")
+                        + Text(font.pointSize, format: .number.precision(.fractionLength(1)))
+                        + Text("pt")
+                
+                Spacer().frame(width: 30)
+                
+                Image(systemName: "textformat")
+                    .frame(width: 13)
+                    .scaledToFit()
+            }
+        }
+    }
+
+    final class FontManagerDelegate: NSObject {
+        let font: NSFont
+        let onSelection: (NSFont) -> Void
+        init(font: NSFont, onSelection: @escaping (NSFont) -> Void) {
+            self.font = font
+            self.onSelection = onSelection
+        }
+
+        @objc func changeFont(_ sender: NSFontManager) {
+            onSelection(sender.convert(font))
+        }
+    }
+}
+
+public extension FontPicker {
+    init(font: Binding<StorableFont>) {
+        _font = Binding(
+            get: { font.wrappedValue.nsFont },
+            set: { font.wrappedValue = StorableFont(nsFont: $0) }
+        )
+    }
+}
+
+#Preview {
+    FontPicker(font: .constant(.systemFont(ofSize: 15)))
+        .padding()
+}
+