SwiftUI

CustomSpacer.swift

//
//  CustomSpacer.swift
//
//  Created by Tieme on 12/06/2024.
//

import SwiftUI
import Combine

struct CustomSpacer: View {
    static var isHidden = CurrentValueSubject<Bool, Never>(false)
    @State private var isHidden: Bool = false

    var height: CGFloat?
    var width: CGFloat?
    @State var size: CGSize = .zero
    var text: String {
        [
            height != nil ? String(format: "%.1f", size.height) : nil,
            width != nil ? String(format: "%.1f", size.width) : nil
        ]
            .compactMap { $0 }
            .joined(separator: "x")
    }

    var body: some View {
        Group {
            if let height {
                Spacer().frame(height: height)
            } else if let width {
                Spacer().frame(width: width)
            } else {
                Spacer()
            }
        }
        .overlay(
            ZStack {
                Rectangle()
                    .fill(.thinMaterial)
                    .frame(minWidth: width ?? 30, minHeight: height ?? 30)
                    .border(.regularMaterial)
                    .onGeometryChange(
                        for: CGSize.self,
                        of: { $0.size },
                        action: { old, new in size = new }
                    )
                Text(height != nil || width != nil ? "Variable" : text)
                    .font(.caption2)
                    .lineLimit(1)
                    .minimumScaleFactor(0.1)
                    .padding(4)
            }
                .opacity(isHidden ? 0 : 1)
        )
        .onReceive(CustomSpacer.isHidden) { self.isHidden = $0 }
    }
}