Tusker/Packages/ComposeUI/Sources/ComposeUI/Views/AttachmentDescriptionTextVi...

140 lines
4.3 KiB
Swift
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//
// AttachmentDescriptionTextView.swift
// ComposeUI
//
// Created by Shadowfacts on 3/12/23.
//
import SwiftUI
private var placeholder: some View {
Text("Describe for the visually impaired…")
}
struct InlineAttachmentDescriptionView: View {
@ObservedObject private var attachment: DraftAttachment
private let minHeight: CGFloat
@State private var height: CGFloat?
init(attachment: DraftAttachment, minHeight: CGFloat) {
self.attachment = attachment
self.minHeight = minHeight
}
var body: some View {
ZStack(alignment: .topLeading) {
if attachment.attachmentDescription.isEmpty {
placeholder
.font(.body)
.foregroundColor(.secondary)
.offset(x: 4, y: 8)
}
WrappedTextView(
text: $attachment.attachmentDescription,
backgroundColor: .clear,
textDidChange: self.textDidChange
)
.frame(height: height ?? minHeight)
}
}
private func textDidChange(_ textView: UITextView) {
height = max(minHeight, textView.contentSize.height)
}
}
struct FocusedAttachmentDescriptionView: View {
@ObservedObject var attachment: DraftAttachment
var body: some View {
ZStack(alignment: .topLeading) {
WrappedTextView(
text: $attachment.attachmentDescription,
backgroundColor: .secondarySystemBackground,
textDidChange: nil
)
.edgesIgnoringSafeArea([.bottom, .leading, .trailing])
if attachment.attachmentDescription.isEmpty {
placeholder
.font(.body)
.foregroundColor(.secondary)
.offset(x: 4, y: 8)
.allowsHitTesting(false)
}
}
}
}
private struct WrappedTextView: UIViewRepresentable {
typealias UIViewType = UITextView
@Binding var text: String
let backgroundColor: UIColor
let textDidChange: (((UITextView) -> Void))?
@Environment(\.isEnabled) private var isEnabled
func makeUIView(context: Context) -> UITextView {
let view = UITextView()
view.delegate = context.coordinator
view.backgroundColor = backgroundColor
view.font = .preferredFont(forTextStyle: .body)
view.adjustsFontForContentSizeCategory = true
view.textContainer.lineBreakMode = .byWordWrapping
return view
}
func updateUIView(_ uiView: UITextView, context: Context) {
uiView.text = text
uiView.isEditable = isEnabled
context.coordinator.textView = uiView
context.coordinator.text = $text
context.coordinator.didChange = textDidChange
if let textDidChange {
// 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)
}
}
}
func makeCoordinator() -> Coordinator {
Coordinator(text: $text, didChange: textDidChange)
}
class Coordinator: NSObject, UITextViewDelegate, TextViewCaretScrolling {
weak var textView: UITextView?
var text: Binding<String>
var didChange: ((UITextView) -> Void)?
var caretScrollPositionAnimator: UIViewPropertyAnimator?
init(text: Binding<String>, didChange: ((UITextView) -> Void)?) {
self.text = text
self.didChange = didChange
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)
}
func textViewDidChange(_ textView: UITextView) {
text.wrappedValue = textView.text
didChange?(textView)
ensureCursorVisible(textView: textView)
}
}
}