85 lines
2.6 KiB
Swift
85 lines
2.6 KiB
Swift
//
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// ReloadingContent.swift
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// Passepartout
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//
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// Created by Davide De Rosa on 4/4/22.
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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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struct ReloadingContent<T: Equatable, Content: View>: View {
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@Environment(\.scenePhase) private var scenePhase
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private let elements: [T]
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private let equality: ([T], [T]) -> Bool
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private let reload: (() -> Void)?
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@ViewBuilder private let content: ([T]) -> Content
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@State private var localElements: [T] = []
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init(
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observing elements: [T],
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equality: @escaping ([T], [T]) -> Bool = { $0 == $1 },
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reload: (() -> Void)? = nil,
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@ViewBuilder content: @escaping ([T]) -> Content
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) {
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self.elements = elements
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self.equality = equality
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self.reload = reload
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self.content = content
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// XXX: not sure about this, but if content() is empty .onAppear() will
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// never trigger, thus never setting initial elements
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//
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// BEWARE: localElements will not be automatically bound to changes
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// in elements (use a Binding for that), but this is actually intended
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_localElements = State(initialValue: elements)
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if elements.isEmpty {
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reload?()
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}
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}
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var body: some View {
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Group {
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content(localElements)
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// }.onAppear {
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// localElements = elements
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// if localElements.isEmpty {
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// reload?()
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// }
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}.onChange(of: elements) { newElements in
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guard !equality(localElements, newElements) else {
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return
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}
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withAnimation {
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localElements = newElements
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}
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}.onChange(of: scenePhase) {
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if $0 == .active {
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reload?()
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}
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}
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}
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}
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