101 lines
3.7 KiB
Swift
101 lines
3.7 KiB
Swift
// SPDX-FileCopyrightText: 2026 Kaede Akino
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// SPDX-License-Identifier: GPL-3.0-only
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import SwiftUI
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import TermindPresentation
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import UIKit
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/// A field-scoped paste proxy; the original text-input delegate is never replaced.
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struct MobileSingleLineFieldInput: UIViewRepresentable {
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final class Marker: UIView {
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private weak var field: UITextField?
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private let proxy = DelegateProxy()
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override func didMoveToWindow() {
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super.didMoveToWindow()
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scheduleAttach()
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}
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func scheduleAttach() {
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DispatchQueue.main.async { [weak self] in self?.attach() }
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}
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private func attach() {
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guard window != nil else {
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detach()
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return
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}
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var ancestor = superview
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while let view = ancestor {
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if let candidate = findField(in: view) {
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guard !candidate.isSecureTextEntry else { return }
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if let existing = candidate.pasteDelegate as? DelegateProxy, existing !== proxy { return }
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if field !== candidate { detach() }
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field = candidate
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if candidate.pasteDelegate !== proxy {
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proxy.originalDelegate = candidate.pasteDelegate
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candidate.pasteDelegate = proxy
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}
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return
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}
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ancestor = view.superview
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}
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}
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private func findField(in view: UIView) -> UITextField? {
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if let field = view as? UITextField, field.convert(field.bounds, to: self).intersects(bounds) {
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return field
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}
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return view.subviews.lazy.compactMap { self.findField(in: $0) }.first
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}
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func detach() {
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if field?.pasteDelegate === proxy { field?.pasteDelegate = proxy.originalDelegate }
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field = nil
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proxy.originalDelegate = nil
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}
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}
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// NSObject's selector lookup is nonisolated; UIKit's actual paste callback stays MainActor.
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nonisolated final class DelegateProxy: NSObject, UITextPasteDelegate {
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weak var originalDelegate: (any UITextPasteDelegate)?
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override func responds(to selector: Selector!) -> Bool {
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super.responds(to: selector) || originalDelegate?.responds(to: selector) == true
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}
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override func forwardingTarget(for selector: Selector!) -> Any? {
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if originalDelegate?.responds(to: selector) == true { return originalDelegate }
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return super.forwardingTarget(for: selector)
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}
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@MainActor
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func textPasteConfigurationSupporting(
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_ textPasteConfigurationSupporting: any UITextPasteConfigurationSupporting,
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combineItemAttributedStrings itemStrings: [NSAttributedString], for textRange: UITextRange
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) -> NSAttributedString {
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let combined: NSAttributedString
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if let original = originalDelegate?.textPasteConfigurationSupporting?(
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textPasteConfigurationSupporting, combineItemAttributedStrings: itemStrings, for: textRange)
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{
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combined = original
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} else {
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let result = NSMutableAttributedString(string: "")
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for item in itemStrings { result.append(item) }
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combined = result
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}
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return SingleLineTextInput.normalized(combined)
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}
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}
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func makeUIView(context: Context) -> Marker {
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let view = Marker()
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view.isUserInteractionEnabled = false
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return view
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}
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func updateUIView(_ view: Marker, context: Context) { view.scheduleAttach() }
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static func dismantleUIView(_ view: Marker, coordinator: ()) { view.detach() }
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}
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