126 lines
3.5 KiB
Swift
126 lines
3.5 KiB
Swift
//
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// ComposeTextView.swift
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// Tusker
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//
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// Created by Shadowfacts on 8/18/20.
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// Copyright © 2020 Shadowfacts. All rights reserved.
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//
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import SwiftUI
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struct ComposeTextView: 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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private var heightDidChange: ((CGFloat) -> Void)?
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private var backgroundColor = UIColor.secondarySystemBackground
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private var fontSize: CGFloat = 20
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@State private var height: CGFloat?
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init(text: Binding<String>, placeholder: Text?, minHeight: CGFloat = 150) {
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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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Color(backgroundColor)
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if text.isEmpty, let placeholder = placeholder {
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placeholder
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.font(.system(size: fontSize))
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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: .systemFont(ofSize: fontSize)
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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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heightDidChange?(height!)
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}
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func heightDidChange(_ callback: @escaping (CGFloat) -> Void) -> Self {
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var copy = self
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copy.heightDidChange = callback
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return copy
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}
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func backgroundColor(_ color: UIColor) -> Self {
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var copy = self
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copy.backgroundColor = color
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return copy
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}
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func fontSize(_ size: CGFloat) -> Self {
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var copy = self
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copy.fontSize = size
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return copy
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}
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}
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struct WrappedTextView: UIViewRepresentable {
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typealias UIViewType = UITextView
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@Binding var text: String
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var textDidChange: ((UITextView) -> Void)?
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var font = UIFont.systemFont(ofSize: 20)
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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.isEditable = true
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textView.backgroundColor = .clear
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textView.font = font
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textView.textContainer.lineBreakMode = .byWordWrapping
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return textView
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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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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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return Coordinator(text: $text, didChange: textDidChange)
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}
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class Coordinator: NSObject, UITextViewDelegate {
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var text: Binding<String>
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var didChange: ((UITextView) -> Void)?
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init(text: Binding<String>, didChange: ((UITextView) -> Void)?) {
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self.text = text
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self.didChange = didChange
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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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}
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}
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}
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//struct ComposeTextView_Previews: PreviewProvider {
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// static var previews: some View {
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// ComposeTextView()
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// }
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//}
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