Tusker/Packages/ComposeUI/Sources/ComposeUI/Views/MainTextView.swift

337 lines
13 KiB
Swift

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