passepartout-apple/Passepartout/App/Reusable/CopySavingButton.swift

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2022-04-12 13:09:14 +00:00
//
// CopySavingButton.swift
// Passepartout
//
// Created by Davide De Rosa on 4/6/22.
// Copyright (c) 2022 Davide De Rosa. All rights reserved.
//
// https://github.com/passepartoutvpn
//
// This file is part of Passepartout.
//
// Passepartout is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Passepartout is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Passepartout. If not, see <http://www.gnu.org/licenses/>.
//
import SwiftUI
protocol CopySavingModel: Equatable {
init()
}
struct CopySavingButton<T: CopySavingModel, Label: View>: View {
@Binding var original: T
@Binding var copy: T
var mapping: (T) -> T
let label: () -> Label
var saveAnyway = false
var onSave: (() -> Void)?
@State private var isLoaded = false
var body: some View {
Button(action: saveToOriginal, label: label)
.disabled(!canSave)
.onAppear {
loadFromOriginal(once: true)
}.onChange(of: original) { _ in
withAnimation {
loadFromOriginal(once: false)
}
}
}
private var canSave: Bool {
isLoaded && (saveAnyway || copy != original)
}
private func loadFromOriginal(once: Bool) {
guard !once || !isLoaded else {
return
}
copy = original
isLoaded = true
}
private func saveToOriginal() {
defer {
onSave?()
}
guard copy != original else {
return
}
original = copy
}
}