damus

nostr ios client
git clone git://jb55.com/damus
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SwipeToDismiss.swift (1515B)

      1 //
      2 //  SwipeToDismiss.swift
      3 //  damus
      4 //
      5 //  Created by Joel Klabo on 1/18/23.
      6 //
      7 
      8 import SwiftUI
      9 
     10 struct SwipeToDismissModifier: ViewModifier {
     11     let minDistance: CGFloat?
     12     var onDismiss: () -> Void
     13     @State private var offset: CGSize = .zero
     14     @GestureState private var viewOffset: CGSize = .zero
     15     
     16     let threshold_offset: CGFloat = 100.0
     17     let minimum_opacity: CGFloat = 0.1
     18 
     19     func body(content: Content) -> some View {
     20         content
     21             .offset(y: viewOffset.height)
     22             .animation(.interactiveSpring(), value: viewOffset)
     23             .opacity(max(min(1.0 - (abs(offset.height) / threshold_offset), 1.0), minimum_opacity))
     24             .simultaneousGesture(
     25                 DragGesture(minimumDistance: minDistance ?? 10)
     26                     .updating($viewOffset, body: { value, gestureState, transaction in
     27                         gestureState = CGSize(width: value.location.x - value.startLocation.x, height: value.location.y - value.startLocation.y)
     28                     })
     29                     .onChanged { gesture in
     30                         if gesture.translation.width < 50 {
     31                             offset = gesture.translation
     32                         }
     33                     }
     34                     .onEnded { _ in
     35                         if abs(offset.height) > threshold_offset {
     36                             onDismiss()
     37                         } else {
     38                             offset = .zero
     39                         }
     40                     }
     41             )
     42     }
     43 }