102 lines
4.1 KiB
Swift
102 lines
4.1 KiB
Swift
//
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// TextViewWrapper.swift
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// damus
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//
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// Created by Swift on 2/24/23.
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//
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import SwiftUI
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struct TextViewWrapper: UIViewRepresentable {
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@Binding var attributedText: NSMutableAttributedString
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@Binding var postTextViewCanScroll: Bool
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@EnvironmentObject var tagModel: TagModel
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let cursorIndex: Int?
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var getFocusWordForMention: ((String?, NSRange?) -> Void)? = nil
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func makeUIView(context: Context) -> UITextView {
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let textView = UITextView()
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textView.delegate = context.coordinator
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textView.isScrollEnabled = postTextViewCanScroll
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textView.showsVerticalScrollIndicator = false
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TextViewWrapper.setTextProperties(textView)
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return textView
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}
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static func setTextProperties(_ uiView: UITextView) {
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uiView.textColor = UIColor.label
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uiView.font = UIFont.preferredFont(forTextStyle: .body)
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let linkAttributes: [NSAttributedString.Key : Any] = [
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NSAttributedString.Key.foregroundColor: UIColor(Color.accentColor)]
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uiView.linkTextAttributes = linkAttributes
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}
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func updateUIView(_ uiView: UITextView, context: Context) {
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uiView.isScrollEnabled = postTextViewCanScroll
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let range = uiView.selectedRange
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uiView.attributedText = attributedText
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TextViewWrapper.setTextProperties(uiView)
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setCursorPosition(textView: uiView)
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uiView.selectedRange = NSRange(location: range.location + tagModel.diff, length: range.length)
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tagModel.diff = 0
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}
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private func setCursorPosition(textView: UITextView) {
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guard let index = cursorIndex, let newPosition = textView.position(from: textView.beginningOfDocument, offset: index) else {
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return
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}
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textView.selectedTextRange = textView.textRange(from: newPosition, to: newPosition)
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}
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func makeCoordinator() -> Coordinator {
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Coordinator(attributedText: $attributedText, getFocusWordForMention: getFocusWordForMention)
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}
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class Coordinator: NSObject, UITextViewDelegate {
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@Binding var attributedText: NSMutableAttributedString
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var getFocusWordForMention: ((String?, NSRange?) -> Void)? = nil
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init(attributedText: Binding<NSMutableAttributedString>, getFocusWordForMention: ((String?, NSRange?) -> Void)?) {
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_attributedText = attributedText
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self.getFocusWordForMention = getFocusWordForMention
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}
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func textViewDidChange(_ textView: UITextView) {
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attributedText = NSMutableAttributedString(attributedString: textView.attributedText)
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processFocusedWordForMention(textView: textView)
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}
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private func processFocusedWordForMention(textView: UITextView) {
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var val: (String?, NSRange?) = (nil, nil)
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guard let selectedRange = textView.selectedTextRange else { return }
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let wordRange = textView.tokenizer.rangeEnclosingPosition(selectedRange.start, with: .word, inDirection: .init(rawValue: UITextLayoutDirection.left.rawValue))
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if let wordRange,
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let startPosition = textView.position(from: wordRange.start, offset: -1),
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let cursorPosition = textView.position(from: selectedRange.start, offset: 0)
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{
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let word = textView.text(in: textView.textRange(from: startPosition, to: cursorPosition)!)
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val = (word, convertToNSRange(startPosition, cursorPosition, textView))
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}
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getFocusWordForMention?(val.0, val.1)
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}
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private func convertToNSRange( _ startPosition: UITextPosition, _ endPosition: UITextPosition, _ textView: UITextView) -> NSRange? {
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let startOffset = textView.offset(from: textView.beginningOfDocument, to: startPosition)
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let endOffset = textView.offset(from: textView.beginningOfDocument, to: endPosition)
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let length = endOffset - startOffset
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guard length >= 0, startOffset >= 0 else {
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return nil
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}
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return NSRange(location: startOffset, length: length)
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}
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}
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}
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