341 lines
13 KiB
Swift
341 lines
13 KiB
Swift
//
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// MainTextView.swift
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// ComposeUI
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//
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// Created by Shadowfacts on 3/6/23.
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//
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import SwiftUI
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struct MainTextView: View {
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@EnvironmentObject private var controller: ComposeController
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@EnvironmentObject private var draft: Draft
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@Environment(\.colorScheme) private var colorScheme
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@ScaledMetric private var fontSize = 20
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@State private var hasFirstAppeared = false
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@State private var height: CGFloat?
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@State private var updateSelection: ((UITextView) -> Void)?
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private let minHeight: CGFloat = 150
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private var effectiveHeight: CGFloat { height ?? minHeight }
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var config: ComposeUIConfig {
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controller.config
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}
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private var placeholderOffset: CGSize {
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#if os(visionOS)
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CGSize(width: 8, height: 8)
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#else
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CGSize(width: 4, height: 8)
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#endif
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}
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private var textViewBackgroundColor: UIColor? {
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#if os(visionOS)
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nil
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#else
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colorScheme == .dark ? UIColor(config.fillColor) : .secondarySystemBackground
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#endif
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}
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var body: some View {
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ZStack(alignment: .topLeading) {
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MainWrappedTextViewRepresentable(
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text: $draft.text,
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backgroundColor: textViewBackgroundColor,
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becomeFirstResponder: $controller.mainComposeTextViewBecomeFirstResponder,
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updateSelection: $updateSelection,
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textDidChange: textDidChange
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)
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if draft.text.isEmpty {
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ControllerView(controller: { PlaceholderController() })
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.font(.system(size: fontSize))
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.foregroundColor(.secondary)
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.offset(placeholderOffset)
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.accessibilityHidden(true)
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.allowsHitTesting(false)
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}
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}
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.frame(height: effectiveHeight)
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.onAppear(perform: becomeFirstResponderOnFirstAppearance)
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}
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private func becomeFirstResponderOnFirstAppearance() {
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if !hasFirstAppeared {
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hasFirstAppeared = true
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controller.mainComposeTextViewBecomeFirstResponder = true
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if config.textSelectionStartsAtBeginning {
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updateSelection = { textView in
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textView.selectedTextRange = textView.textRange(from: textView.beginningOfDocument, to: textView.beginningOfDocument)
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}
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}
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}
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}
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private func textDidChange(textView: UITextView) {
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height = max(textView.contentSize.height, minHeight)
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}
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}
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fileprivate struct MainWrappedTextViewRepresentable: UIViewRepresentable {
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typealias UIViewType = UITextView
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@Binding var text: String
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let backgroundColor: UIColor?
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@Binding var becomeFirstResponder: Bool
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@Binding var updateSelection: ((UITextView) -> Void)?
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let textDidChange: (UITextView) -> Void
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@EnvironmentObject private var controller: ComposeController
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@Environment(\.isEnabled) private var isEnabled: Bool
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func makeUIView(context: Context) -> UITextView {
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let textView = WrappedTextView(composeController: controller)
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context.coordinator.textView = textView
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textView.delegate = context.coordinator
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textView.isEditable = true
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textView.font = UIFontMetrics.default.scaledFont(for: .systemFont(ofSize: 20))
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textView.adjustsFontForContentSizeCategory = true
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textView.textContainer.lineBreakMode = .byWordWrapping
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#if os(visionOS)
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textView.borderStyle = .roundedRect
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// yes, the X inset is 4 less than the placeholder offset
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textView.textContainerInset = UIEdgeInsets(top: 8, left: 4, bottom: 8, right: 4)
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#endif
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return textView
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}
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func updateUIView(_ uiView: UITextView, context: Context) {
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if text != uiView.text {
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context.coordinator.skipNextSelectionChangedAutocompleteUpdate = true
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uiView.text = text
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}
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uiView.isEditable = isEnabled
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uiView.keyboardType = controller.config.useTwitterKeyboard ? .twitter : .default
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uiView.backgroundColor = backgroundColor
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context.coordinator.text = $text
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if let updateSelection {
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updateSelection(uiView)
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self.updateSelection = nil
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}
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// wait until the next runloop iteration so that SwiftUI view updates have finished and
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// the text view knows its new content size
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DispatchQueue.main.async {
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textDidChange(uiView)
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if becomeFirstResponder {
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// calling becomeFirstResponder during the SwiftUI update causes a crash on iOS 13
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uiView.becomeFirstResponder()
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// can't update @State vars during the SwiftUI update
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becomeFirstResponder = false
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}
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}
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}
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func makeCoordinator() -> Coordinator {
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Coordinator(controller: controller, text: $text, textDidChange: textDidChange)
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}
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class WrappedTextView: UITextView {
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private let formattingActions = [#selector(toggleBoldface(_:)), #selector(toggleItalics(_:))]
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private let composeController: ComposeController
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init(composeController: ComposeController) {
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self.composeController = composeController
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super.init(frame: .zero, textContainer: nil)
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}
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required init?(coder: NSCoder) {
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fatalError()
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}
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override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
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if formattingActions.contains(action) {
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return composeController.config.contentType != .plain
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}
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return super.canPerformAction(action, withSender: sender)
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}
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override func toggleBoldface(_ sender: Any?) {
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(delegate as! Coordinator).applyFormat(.bold)
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}
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override func toggleItalics(_ sender: Any?) {
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(delegate as! Coordinator).applyFormat(.italics)
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}
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override func validate(_ command: UICommand) {
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super.validate(command)
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if formattingActions.contains(command.action),
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composeController.config.contentType != .plain {
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command.attributes.remove(.disabled)
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}
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}
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override func paste(_ sender: Any?) {
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// we deliberately exclude the other CompositionAttachment readable type identifiers, because that's too overzealous with the conversion
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// and things like URLs end up pasting as attachments
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if UIPasteboard.general.contains(pasteboardTypes: UIImage.readableTypeIdentifiersForItemProvider) {
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composeController.paste(itemProviders: UIPasteboard.general.itemProviders)
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} else {
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super.paste(sender)
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}
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}
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}
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class Coordinator: NSObject, UITextViewDelegate, ComposeInput, TextViewCaretScrolling {
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weak var textView: UITextView?
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let controller: ComposeController
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var text: Binding<String>
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let textDidChange: (UITextView) -> Void
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var caretScrollPositionAnimator: UIViewPropertyAnimator?
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@Published var autocompleteState: AutocompleteState?
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var autocompleteStatePublisher: Published<AutocompleteState?>.Publisher { $autocompleteState }
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var skipNextSelectionChangedAutocompleteUpdate = false
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init(controller: ComposeController, text: Binding<String>, textDidChange: @escaping (UITextView) -> Void) {
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self.controller = controller
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self.text = text
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self.textDidChange = textDidChange
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super.init()
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NotificationCenter.default.addObserver(self, selector: #selector(keyboardDidShow), name: UIResponder.keyboardDidShowNotification, object: nil)
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}
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@objc private func keyboardDidShow() {
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guard let textView,
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textView.isFirstResponder else {
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return
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}
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ensureCursorVisible(textView: textView)
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}
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// MARK: UITextViewDelegate
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func textViewDidChange(_ textView: UITextView) {
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text.wrappedValue = textView.text
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textDidChange(textView)
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ensureCursorVisible(textView: textView)
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}
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func textViewDidBeginEditing(_ textView: UITextView) {
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controller.currentInput = self
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updateAutocompleteState()
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}
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func textViewDidEndEditing(_ textView: UITextView) {
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controller.currentInput = nil
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updateAutocompleteState()
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}
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func textViewDidChangeSelection(_ textView: UITextView) {
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if skipNextSelectionChangedAutocompleteUpdate {
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skipNextSelectionChangedAutocompleteUpdate = false
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} else {
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updateAutocompleteState()
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}
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}
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func textView(_ textView: UITextView, editMenuForTextIn range: NSRange, suggestedActions: [UIMenuElement]) -> UIMenu? {
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var actions = suggestedActions
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if controller.config.contentType != .plain,
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let index = suggestedActions.firstIndex(where: { ($0 as? UIMenu)?.identifier.rawValue == "com.apple.menu.format" }) {
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if range.length > 0 {
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let formatMenu = suggestedActions[index] as! UIMenu
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let newFormatMenu = formatMenu.replacingChildren(StatusFormat.allCases.map { fmt in
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var image: UIImage?
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if let imageName = fmt.imageName {
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image = UIImage(systemName: imageName)
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}
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return UIAction(title: fmt.accessibilityLabel, image: image) { [weak self] _ in
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self?.applyFormat(fmt)
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}
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})
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actions[index] = newFormatMenu
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} else {
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actions.remove(at: index)
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}
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}
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if range.length == 0 {
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actions.append(UIAction(title: "Insert Emoji", image: UIImage(systemName: "face.smiling"), handler: { [weak self] _ in
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self?.controller.shouldEmojiAutocompletionBeginExpanded = true
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self?.beginAutocompletingEmoji()
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}))
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}
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return UIMenu(children: actions)
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}
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// MARK: ComposeInput
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var toolbarElements: [ToolbarElement] {
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[.emojiPicker, .formattingButtons]
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}
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var textInputMode: UITextInputMode? {
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textView?.textInputMode
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}
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func autocomplete(with string: String) {
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textView?.autocomplete(with: string, permittedModes: .all, autocompleteState: &autocompleteState)
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}
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func applyFormat(_ format: StatusFormat) {
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guard let textView,
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textView.isFirstResponder,
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let insertionResult = format.insertionResult(for: controller.config.contentType) else {
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return
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}
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let currentSelectedRange = textView.selectedRange
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if currentSelectedRange.length == 0 {
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textView.insertText(insertionResult.prefix + insertionResult.suffix)
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textView.selectedRange = NSRange(location: currentSelectedRange.location + insertionResult.insertionPoint, length: 0)
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} else {
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let start = textView.text.utf16.index(textView.text.utf16.startIndex, offsetBy: currentSelectedRange.lowerBound)
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let end = textView.text.utf16.index(textView.text.utf16.startIndex, offsetBy: currentSelectedRange.upperBound)
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let selectedText = textView.text.utf16[start..<end]
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textView.insertText(insertionResult.prefix + String(Substring(selectedText)) + insertionResult.suffix)
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textView.selectedRange = NSRange(location: currentSelectedRange.location + insertionResult.insertionPoint, length: currentSelectedRange.length)
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}
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}
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func beginAutocompletingEmoji() {
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guard let textView else {
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return
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}
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var insertSpace = false
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if let text = textView.text,
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textView.selectedRange.upperBound > 0 {
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let characterBeforeCursorIndex = text.utf16.index(before: text.utf16.index(text.startIndex, offsetBy: textView.selectedRange.upperBound))
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insertSpace = !text[characterBeforeCursorIndex].isWhitespace
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}
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textView.insertText((insertSpace ? " " : "") + ":")
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}
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private func updateAutocompleteState() {
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guard let textView else {
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autocompleteState = nil
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return
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}
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autocompleteState = textView.updateAutocompleteState(permittedModes: .all)
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}
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}
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}
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