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#if canImport(UIKit) || canImport(AppKit)
import SwiftUI
/// A SwiftUI source editor for `.norg` documents with syntax highlighting
/// and context-aware indentation.
///
/// ```swift
/// NorgEditor(text: $draft)
/// .norgEditorTheme(myTheme)
/// ```
public struct NorgEditor {
@Binding private var text: String
@Environment(\.norgEditorTheme) private var theme
public init(text: Binding<String>) {
self._text = text
}
}
#endif
#if canImport(UIKit)
import UIKit
import NorgKeyboardToolbar
extension NorgEditor: UIViewRepresentable {
public func makeUIView(context: Context) -> UITextView {
let textView = UITextView()
textView.delegate = context.coordinator
textView.backgroundColor = .clear
textView.textContainerInset = UIEdgeInsets(top: 8, left: 0, bottom: 8, right: 0)
textView.textContainer.lineFragmentPadding = 0
textView.alwaysBounceVertical = true
textView.contentInsetAdjustmentBehavior = .never
textView.installNorgKeyboardAccessory()
textView.smartQuotesType = .yes
textView.smartDashesType = .no
textView.smartInsertDeleteType = .no
textView.dataDetectorTypes = []
textView.autocorrectionType = .default
textView.spellCheckingType = .default
textView.autocapitalizationType = .sentences
#if os(iOS)
context.coordinator.observeKeyboard(for: textView)
#endif
textView.text = text
context.coordinator.apply(theme, to: textView)
return textView
}
public func updateUIView(_ textView: UITextView, context: Context) {
context.coordinator.parent = self
if textView.text != text {
textView.text = text
context.coordinator.highlight(textView)
}
}
public func makeCoordinator() -> Coordinator { Coordinator(self) }
public final class Coordinator: NSObject, UITextViewDelegate {
fileprivate var parent: NorgEditor
private var theme: EditorTheme = .default
private var isAutoIndenting = false
init(_ parent: NorgEditor) { self.parent = parent }
deinit { NotificationCenter.default.removeObserver(self) }
// MARK: - Auto-indentation
public func textView(
_ textView: UITextView,
shouldChangeTextIn range: NSRange,
replacementText text: String
) -> Bool {
guard !isAutoIndenting, text == "\n" else { return true }
let indent = NorgAutoIndent.indentation(
for: textView.text, newlineAt: range.location)
guard !indent.isEmpty else { return true }
guard
let start = textView.position(
from: textView.beginningOfDocument, offset: range.location),
let end = textView.position(from: start, offset: range.length),
let textRange = textView.textRange(from: start, to: end)
else { return true }
isAutoIndenting = true
textView.replace(textRange, withText: "\n" + indent)
isAutoIndenting = false
return false
}
// MARK: - Highlighting
func apply(_ theme: EditorTheme, to textView: UITextView) {
self.theme = theme
textView.font = theme.font
textView.typingAttributes = [
.font: theme.font,
.foregroundColor: theme.textColor,
]
highlight(textView)
}
func highlight(_ textView: UITextView) {
guard textView.markedTextRange == nil else { return }
let storage = textView.textStorage
let selection = textView.selectedRange
storage.beginEditing()
theme.applyHighlighting(to: storage)
storage.endEditing()
textView.selectedRange = selection
}
public func textViewDidChange(_ textView: UITextView) {
parent.text = textView.text
highlight(textView)
}
// MARK: - Keyboard avoidance
#if os(iOS)
private weak var textView: UITextView?
func observeKeyboard(for textView: UITextView) {
self.textView = textView
NotificationCenter.default.addObserver(
self,
selector: #selector(keyboardFrameChanged(_:)),
name: UIResponder.keyboardWillChangeFrameNotification,
object: nil
)
}
@objc private func keyboardFrameChanged(_ note: Notification) {
guard let textView, let window = textView.window,
let endFrame = note.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? CGRect
else { return }
let keyboardInWindow = window.convert(endFrame, from: window.screen.fixedCoordinateSpace)
let textViewInWindow = textView.convert(textView.bounds, to: window)
let overlap = max(0, textViewInWindow.maxY - keyboardInWindow.minY)
textView.contentInset.bottom = overlap
textView.verticalScrollIndicatorInsets.bottom = overlap
}
#endif
}
}
#elseif canImport(AppKit)
import AppKit
extension NorgEditor: NSViewRepresentable {
public func makeNSView(context: Context) -> NSScrollView {
let scrollView = NSTextView.scrollableTextView()
scrollView.drawsBackground = false
guard let textView = scrollView.documentView as? NSTextView else { return scrollView }
textView.delegate = context.coordinator
textView.drawsBackground = false
textView.isRichText = false
textView.allowsUndo = true
textView.textContainerInset = NSSize(width: 0, height: 8)
textView.textContainer?.lineFragmentPadding = 0
textView.isAutomaticQuoteSubstitutionEnabled = true
textView.isAutomaticDashSubstitutionEnabled = false
textView.isAutomaticTextReplacementEnabled = false
textView.isAutomaticLinkDetectionEnabled = false
textView.string = text
context.coordinator.apply(theme, to: textView)
return scrollView
}
public func updateNSView(_ scrollView: NSScrollView, context: Context) {
context.coordinator.parent = self
guard let textView = scrollView.documentView as? NSTextView else { return }
if textView.string != text {
textView.string = text
context.coordinator.highlight(textView)
}
}
public func makeCoordinator() -> Coordinator { Coordinator(self) }
// AppKit's `NSTextViewDelegate` isn't `@MainActor`-annotated (UIKit's is),
// so isolation isn't inferred for these callbacks even though the text view
// only ever calls them on the main thread; state the isolation explicitly.
@MainActor
public final class Coordinator: NSObject, NSTextViewDelegate {
fileprivate var parent: NorgEditor
private var theme: EditorTheme = .default
private var isAutoIndenting = false
init(_ parent: NorgEditor) { self.parent = parent }
// MARK: - Auto-indentation
public func textView(
_ textView: NSTextView,
shouldChangeTextIn affectedCharRange: NSRange,
replacementString: String?
) -> Bool {
guard !isAutoIndenting, replacementString == "\n" else { return true }
let indent = NorgAutoIndent.indentation(
for: textView.string, newlineAt: affectedCharRange.location)
guard !indent.isEmpty else { return true }
isAutoIndenting = true
textView.insertText("\n" + indent, replacementRange: affectedCharRange)
isAutoIndenting = false
return false
}
// MARK: - Highlighting
func apply(_ theme: EditorTheme, to textView: NSTextView) {
self.theme = theme
textView.font = theme.font
textView.typingAttributes = [
.font: theme.font,
.foregroundColor: theme.textColor,
]
highlight(textView)
}
func highlight(_ textView: NSTextView) {
guard !textView.hasMarkedText(), let storage = textView.textStorage else { return }
let selection = textView.selectedRange()
storage.beginEditing()
theme.applyHighlighting(to: storage)
storage.endEditing()
textView.setSelectedRange(selection)
}
public func textDidChange(_ notification: Notification) {
guard let textView = notification.object as? NSTextView else { return }
parent.text = textView.string
highlight(textView)
}
}
}
#endif
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