Tusker/Tusker/Views/AccountDisplayNameLabel.swift

108 lines
3.9 KiB
Swift

//
// AccountDisplayNameLabel.swift
// Tusker
//
// Created by Shadowfacts on 9/7/20.
// Copyright © 2020 Shadowfacts. All rights reserved.
//
import SwiftUI
import Pachyderm
import WebURLFoundationExtras
private let emojiRegex = try! NSRegularExpression(pattern: ":(\\w+):", options: [])
struct AccountDisplayNameLabel: View {
let account: any AccountProtocol
let textStyle: Font.TextStyle
@ScaledMetric var emojiSize: CGFloat
@State var text: Text
@State var emojiRequests = [ImageCache.Request]()
init(account: any AccountProtocol, textStyle: Font.TextStyle, emojiSize: CGFloat) {
self.account = account
self.textStyle = textStyle
self._emojiSize = ScaledMetric(wrappedValue: emojiSize, relativeTo: textStyle)
let name = account.displayName.isEmpty ? account.username : account.displayName
self._text = State(initialValue: Text(verbatim: name))
}
var body: some View {
text
.font(.system(textStyle).weight(.semibold))
.onAppear(perform: self.loadEmojis)
}
private func loadEmojis() {
let fullRange = NSRange(account.displayName.startIndex..., in: account.displayName)
let matches = emojiRegex.matches(in: account.displayName, options: [], range: fullRange)
guard !matches.isEmpty else { return }
let emojiImages = MultiThreadDictionary<String, Image>()
let group = DispatchGroup()
for emoji in account.emojis {
guard matches.contains(where: { (match) in
let matchShortcode = (account.displayName as NSString).substring(with: match.range(at: 1))
return emoji.shortcode == matchShortcode
}) else {
continue
}
group.enter()
let request = ImageCache.emojis.get(URL(emoji.url)!) { (_, image) in
defer { group.leave() }
guard let image = image else { return }
let size = CGSize(width: emojiSize, height: emojiSize)
let renderer = UIGraphicsImageRenderer(size: size)
let resized = renderer.image { (ctx) in
image.draw(in: CGRect(origin: .zero, size: size))
}
emojiImages[emoji.shortcode] = Image(uiImage: resized)
}
if let request = request {
emojiRequests.append(request)
}
}
group.notify(queue: .main) {
var text: Text?
var endIndex = account.displayName.utf16.count
// iterate backwards as to not alter the indices of earlier matches
for match in matches.reversed() {
let shortcode = (account.displayName as NSString).substring(with: match.range(at: 1))
guard let image = emojiImages[shortcode] else { continue }
let afterCurrentMatch = (account.displayName as NSString).substring(with: NSRange(location: match.range.upperBound, length: endIndex - match.range.upperBound))
if let subsequent = text {
text = Text(image) + Text(verbatim: afterCurrentMatch) + subsequent
} else {
text = Text(image) + Text(verbatim: afterCurrentMatch)
}
endIndex = match.range.lowerBound
}
let beforeLastMatch = (account.displayName as NSString).substring(to: endIndex)
if let text = text {
self.text = Text(verbatim: beforeLastMatch) + text
} else {
self.text = Text(verbatim: beforeLastMatch)
}
}
}
}
//struct AccountDisplayNameLabel_Previews: PreviewProvider {
// static var previews: some View {
// AccountDisplayNameLabel()
// }
//}