mastodon-app-ufficiale-ipho.../MastodonSDK/Sources/MastodonUI/SwiftUI/MetaTextViewRepresentable.s...

89 lines
2.6 KiB
Swift

//
// MetaTextViewRepresentable.swift
//
//
// Created by MainasuK Cirno on 2021-7-16.
//
import UIKit
import SwiftUI
import UITextView_Placeholder
import MetaTextKit
import MastodonAsset
import MastodonCore
public struct MetaTextViewRepresentable: UIViewRepresentable {
let metaText = MetaText()
// input
@Binding var string: String
let width: CGFloat
// handler
let configurationHandler: (MetaText) -> Void
public func makeUIView(context: Context) -> MetaTextView {
let textView = metaText.textView
textView.backgroundColor = .clear // clear background
textView.textContainer.lineFragmentPadding = 0 // remove leading inset
textView.isScrollEnabled = false // enable dynamic height
// set width constraint
textView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
textView.widthAnchor.constraint(equalToConstant: width).priority(.required - 1)
])
// make textView horizontal filled
textView.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
// setup editor appearance
let font = UIFont.preferredFont(forTextStyle: .body)
metaText.textView.font = font
metaText.textAttributes = [
.font: font,
.foregroundColor: UIColor.label,
]
metaText.linkAttributes = [
.font: font,
.foregroundColor: Asset.Colors.Brand.blurple.color,
]
metaText.paragraphStyle = NSMutableParagraphStyle()
configurationHandler(metaText)
metaText.configure(content: PlaintextMetaContent(string: string))
return textView
}
public func updateUIView(_ metaTextView: MetaTextView, context: Context) {
// update layout
context.coordinator.widthLayoutConstraint.constant = width
// trigger layout engine update to adjust to text height
metaText.textView.setNeedsLayout()
metaText.textView.layoutIfNeeded()
}
public func makeCoordinator() -> Coordinator {
Coordinator(self)
}
public class Coordinator: NSObject, UITextViewDelegate {
let view: MetaTextViewRepresentable
var widthLayoutConstraint: NSLayoutConstraint!
init(_ view: MetaTextViewRepresentable) {
self.view = view
super.init()
widthLayoutConstraint = view.metaText.textView.widthAnchor.constraint(equalToConstant: 100)
widthLayoutConstraint.isActive = true
}
}
}