113 lines
3.4 KiB
Swift
113 lines
3.4 KiB
Swift
//
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// AttachmentDescriptionTextView.swift
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// ComposeUI
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//
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// Created by Shadowfacts on 3/12/23.
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//
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import SwiftUI
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struct AttachmentDescriptionTextView: View {
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@Binding private var text: String
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private let placeholder: Text?
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private let minHeight: CGFloat
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@State private var height: CGFloat?
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init(text: Binding<String>, placeholder: Text?, minHeight: CGFloat) {
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self._text = text
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self.placeholder = placeholder
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self.minHeight = minHeight
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}
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var body: some View {
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ZStack(alignment: .topLeading) {
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if text.isEmpty, let placeholder {
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placeholder
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.font(.body)
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.foregroundColor(.secondary)
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.offset(x: 4, y: 8)
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}
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WrappedTextView(
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text: $text,
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textDidChange: self.textDidChange,
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font: .preferredFont(forTextStyle: .body)
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)
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.frame(height: height ?? minHeight)
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}
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}
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private func textDidChange(_ textView: UITextView) {
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height = max(minHeight, textView.contentSize.height)
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}
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}
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private struct WrappedTextView: UIViewRepresentable {
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typealias UIViewType = UITextView
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@Binding var text: String
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let textDidChange: ((UITextView) -> Void)
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let font: UIFont
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@Environment(\.isEnabled) private var isEnabled
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func makeUIView(context: Context) -> UITextView {
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let view = UITextView()
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view.delegate = context.coordinator
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view.backgroundColor = .clear
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view.font = font
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view.adjustsFontForContentSizeCategory = true
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view.textContainer.lineBreakMode = .byWordWrapping
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return view
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}
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func updateUIView(_ uiView: UITextView, context: Context) {
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uiView.text = text
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uiView.isEditable = isEnabled
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context.coordinator.textView = uiView
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context.coordinator.text = $text
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context.coordinator.didChange = textDidChange
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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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self.textDidChange(uiView)
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}
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}
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func makeCoordinator() -> Coordinator {
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Coordinator(text: $text, didChange: textDidChange)
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}
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class Coordinator: NSObject, UITextViewDelegate, TextViewCaretScrolling {
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weak var textView: UITextView?
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var text: Binding<String>
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var didChange: (UITextView) -> Void
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var caretScrollPositionAnimator: UIViewPropertyAnimator?
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init(text: Binding<String>, didChange: @escaping (UITextView) -> Void) {
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self.text = text
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self.didChange = didChange
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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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func textViewDidChange(_ textView: UITextView) {
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text.wrappedValue = textView.text
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didChange(textView)
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ensureCursorVisible(textView: textView)
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}
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}
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}
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