TouchDownUpEventExtension.swift

/// we can make the modifier more Swifter by wrapping it in a method...
/// ... then making the method an extension of View, so we can easily add it to any SwiftUI view
public extension View {
    func onTouchDownUpEvent(changeState: @escaping (ButtonState) -> Void) -> some View {
        modifier(TouchDownUpEventModifier(changeState: changeState))
    }
}