1 /* 2 * Copyright (C) 2022 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software distributed under the 11 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 12 * KIND, either express or implied. See the License for the specific language governing 13 * permissions and limitations under the License. 14 */ 15 package com.android.systemui.unfold.util 16 17 import java.lang.ref.WeakReference 18 import javax.inject.Inject 19 import javax.inject.Singleton 20 21 interface UnfoldKeyguardVisibilityProvider { 22 /** 23 * True when the keyguard is visible. 24 * 25 * Might be [null] when it is not known. 26 */ 27 val isKeyguardVisible: Boolean? 28 } 29 30 /** Used to notify keyguard visibility. */ 31 interface UnfoldKeyguardVisibilityManager { 32 /** Sets the delegate. [delegate] should return true when the keyguard is visible. */ setKeyguardVisibleDelegatenull33 fun setKeyguardVisibleDelegate(delegate: () -> Boolean) 34 } 35 36 /** 37 * Keeps a [WeakReference] for the keyguard visibility provider. 38 * 39 * It is a weak reference because this is in the global scope, while the delegate might be set from 40 * another subcomponent (that might have shorter lifespan). 41 */ 42 @Singleton 43 class UnfoldKeyguardVisibilityManagerImpl @Inject constructor() : 44 UnfoldKeyguardVisibilityProvider, UnfoldKeyguardVisibilityManager { 45 46 private var delegatedProvider: WeakReference<() -> Boolean?>? = null 47 48 override fun setKeyguardVisibleDelegate(delegate: () -> Boolean) { 49 delegatedProvider = WeakReference(delegate) 50 } 51 52 override val isKeyguardVisible: Boolean? 53 get() = delegatedProvider?.get()?.invoke() 54 } 55