another.im-ios/ConversationsClassic/View/Main/Conversation/ConversationMessageRow.swift

import Foundation
import SwiftUI

struct ConversationMessageRow: View {
    @EnvironmentObject var messages: MessagesStore
    let message: Message
    @State private var offset: CGSize = .zero

    var body: some View {
        VStack(spacing: 0) {
            HStack(spacing: 0) {
                if isOutgoing() {
                    Spacer()
                    MessageAttr(message: message)
                        .padding(.trailing, 4)
                }
                ConversationMessageContainer(message: message, isOutgoing: isOutgoing())
                    .background(isOutgoing() ? Color.Material.Shape.alternate : Color.Material.Shape.white)
                    .clipShape(ConversationMessageBubble(isOutgoing: isOutgoing()))
                if !isOutgoing() {
                    MessageAttr(message: message)
                        .padding(.leading, 4)
                    Spacer()
                }
            }
            .padding(.vertical, 10)
            .padding(.horizontal, 16)
            .background(Color.clearTappable)
            .offset(offset)
            .gesture(
                DragGesture(minimumDistance: 30, coordinateSpace: .local)
                    .onChanged { value in
                        var width = value.translation.width
                        width = width > 0 ? 0 : width
                        offset = CGSize(width: width, height: 0)
                    }
                    .onEnded { value in
                        let targetWidth: CGFloat = -90
                        withAnimation(.easeOut(duration: 0.1)) {
                            if value.translation.width <= targetWidth {
                                Vibration.success.vibrate()
                                DispatchQueue.main.asyncAfter(deadline: .now() + 0.01) {
                                    withAnimation(.easeOut(duration: 0.1)) {
                                        offset = .zero
                                    }
                                }
                            } else {
                                offset = .zero
                            }
                        }
                        if value.translation.width <= targetWidth {
                            DispatchQueue.main.asyncAfter(deadline: .now() + 0.02) {
                                messages.replyText = message.body ?? ""
                            }
                        }
                    }
            )
        }
        .listRowInsets(.zero)
        .listRowSeparator(.hidden)
        .frame(maxWidth: .infinity, maxHeight: .infinity)
        .background(Color.Material.Background.light)
    }

    private func isOutgoing() -> Bool {
        message.from == messages.roster.bareJid
    }
}

struct ConversationMessageBubble: Shape {
    let isOutgoing: Bool

    func path(in rect: CGRect) -> Path {
        let path = UIBezierPath(
            roundedRect: rect,
            byRoundingCorners: isOutgoing ? [.topLeft, .bottomLeft, .bottomRight] : [.topRight, .bottomLeft, .bottomRight],
            cornerRadii: CGSize(width: 8, height: 10)
        )
        return Path(path.cgPath)
    }
}