| 1 | import SwiftUI |
| 2 | |
| 3 | // 🤖 The typing indicator: a them-side bubble with three dots, shown at the |
| 4 | // bottom of the feed while someone's composing. The dots hold their position — |
| 5 | // no bounce — and a brightness wave travels across them left to right. In a |
| 6 | // group a small name line rides above it. |
| 7 | public struct TypingBubble: View { |
| 8 | public let theme: ChatTheme |
| 9 | /// "Eleven is typing…" — shown as a quiet label above the bubble in groups. |
| 10 | public let label: String? |
| 11 | |
| 12 | @Environment(\.colorScheme) private var scheme |
| 13 | @Environment(\.chatFontSize) private var fontSize |
| 14 | |
| 15 | public init(theme: ChatTheme, label: String? = nil) { |
| 16 | self.theme = theme |
| 17 | self.label = label |
| 18 | } |
| 19 | |
| 20 | public var body: some View { |
| 21 | VStack(alignment: .leading, spacing: 2) { |
| 22 | if let label, !label.isEmpty { |
| 23 | Text(label) |
| 24 | .font(.system(size: 11)) |
| 25 | .foregroundStyle(.secondary) |
| 26 | .padding(.horizontal, 6) |
| 27 | } |
| 28 | ZStack { |
| 29 | // Invisible one-line message: same font + insets as a real text |
| 30 | // bubble (MessageBubble's 9/13), so this bubble is EXACTLY one |
| 31 | // message tall at every text size. |
| 32 | Text(verbatim: " ") |
| 33 | .font(.system(size: fontSize)) |
| 34 | .opacity(0) |
| 35 | // Brightness comes from the CLOCK, not delay-staggered |
| 36 | // repeatForever animations: those re-sync into lockstep on any |
| 37 | // feed publish. A phase-offset sine can't drift or sync. |
| 38 | TimelineView(.animation(minimumInterval: 1.0 / 30.0)) { context in |
| 39 | let t = context.date.timeIntervalSinceReferenceDate |
| 40 | // 8pt dots, tight 4pt gaps (the web's .typing-bubble |
| 41 | // metrics): smaller dots read as an oversized, empty |
| 42 | // bubble even at the correct height. |
| 43 | HStack(spacing: 4) { |
| 44 | ForEach(0..<3, id: \.self) { i in |
| 45 | let phase = sin((t / 0.55 - Double(i) * 0.33) * .pi) |
| 46 | Circle() |
| 47 | .fill(.secondary) |
| 48 | .frame(width: 8, height: 8) |
| 49 | .opacity(0.35 + 0.6 * (phase + 1) / 2) |
| 50 | } |
| 51 | } |
| 52 | } |
| 53 | } |
| 54 | .padding(EdgeInsets(top: 9, leading: 13, bottom: 9, trailing: 13)) |
| 55 | .background(theme.bubbleThem.resolved(scheme)) |
| 56 | .clipShape(RoundedRectangle(cornerRadius: 18, style: .continuous)) |
| 57 | } |
| 58 | } |
| 59 | } |
| 60 | |
amadan