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50 lines
1.5 KiB
Swift
50 lines
1.5 KiB
Swift
//
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// Copyright 2021 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import Foundation
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import Combine
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/// Provides the theme and theme updates to SwiftUI.
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///
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/// Replaces the old ThemeObserver. Riot app can push updates to this class
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/// removing the dependency of this class on the `ThemeService`.
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@available(iOS 14.0, *)
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class ThemePublisher: ObservableObject {
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private static var _shared: ThemePublisher? = nil
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static var shared: ThemePublisher {
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if _shared == nil {
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configure(themeId: .light)
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}
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return _shared!
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}
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@Published private(set) var theme: ThemeSwiftUI
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static func configure(themeId: ThemeIdentifier) {
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_shared = ThemePublisher(themeId: themeId)
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}
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init(themeId: ThemeIdentifier) {
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_theme = Published.init(initialValue: themeId.themeSwiftUI)
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}
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func republish(themeIdPublisher: AnyPublisher<ThemeIdentifier, Never>) {
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themeIdPublisher
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.map(\.themeSwiftUI)
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.assign(to: &$theme)
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}
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}
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