37 lines
1.2 KiB
Swift
37 lines
1.2 KiB
Swift
// Copyright 2020-2021 Tokamak contributors
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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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import JavaScriptKit
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import OpenCombineShim
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enum ScenePhaseObserver {
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static var publisher = CurrentValueSubject<ScenePhase, Never>(.active)
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private static var closure: JSClosure?
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static func observe() {
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let closure = JSClosure { _ -> JSValue in
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let visibilityState = document.visibilityState.string
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if visibilityState == "visible" {
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publisher.send(.active)
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} else if visibilityState == "hidden" {
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publisher.send(.background)
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}
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return .undefined
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}
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_ = document.addEventListener!("visibilitychange", closure)
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Self.closure = closure
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}
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}
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