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