SwipeGesture SwiftUI

SwipeGesture.swift

//
// Copyright © 2024 Liebherr-Hausgeräte GmbH. All rights reserved.
//

import SwiftUI
/// A swiping motions that invokes an swipe event telling the direction of the swipe.
/// Example:
/// Add a swipe gesture to a ``Circle`` and change its color while the user
/// performs the swipe gesture:
///
///     struct SwipeGestureView: View {
///         var body: some View {
///             Circle()
///                 .fill(self.isDragging ? Color.red : Color.blue)
///                 .frame(width: 500, height: 500, alignment: .center)
///                 .onSwipe { direction in
///                     self.direction = direction.rawValue
///                 }
///         }
///     }
public struct SwipeGesture: Gesture {
    /// Represent swipe direction on the screen
    public enum Direction {
        // swiftlint:disable identifier_name
        case left, right, up, down
    }

    /// Value that hold the direction of the SwipeGesture
    public typealias Value = Direction

    /// Minimum distance to invoke Swipe event
    private let minimumDistance: CGFloat
    private let coordinateSpace: CoordinateSpace
    // swiftlint:disable magic_numbers
    public init(minimumDistance: CGFloat = 20, coordinateSpace: CoordinateSpace = .local) {
        self.minimumDistance = minimumDistance
        self.coordinateSpace = coordinateSpace
    }

    public var body: AnyGesture<Value> {
        AnyGesture(
            DragGesture(minimumDistance: minimumDistance, coordinateSpace: coordinateSpace)
                .map { value in
                    let horizontalAmount = value.translation.width
                    let verticalAmount = value.translation.height
                    if abs(horizontalAmount) > abs(verticalAmount) {
                        return horizontalAmount < 0 ? .left : .right
                    } else {
                        return verticalAmount < 0 ? .up : .down
                    }
                }
        )
    }

}
extension View {
    /// Provide swipe gesture to any view.
    ///
    public func onSwipe(minimumDistance: CGFloat = 20,
                        coordinateSpace: CoordinateSpace = .local,
                        perform: @escaping (SwipeGesture.Direction) -> Void) -> some View {
        gesture(
            SwipeGesture(minimumDistance: minimumDistance, coordinateSpace: coordinateSpace)
                .onEnded(perform)
        )
    }
}