1 /*
2  * Copyright (C) 2023 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
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.systemui.statusbar.policy
18 
19 import com.android.systemui.common.coroutine.ConflatedCallbackFlow.conflatedCallbackFlow
20 import com.android.systemui.statusbar.notification.collection.NotificationEntry
21 import kotlinx.coroutines.channels.awaitClose
22 import kotlinx.coroutines.flow.Flow
23 
24 /**
25  * Returns a [Flow] that emits events whenever a [NotificationEntry] enters or exists the "heads up"
26  * state.
27  */
28 val HeadsUpManager.headsUpEvents: Flow<Pair<NotificationEntry, Boolean>>
<lambda>null29     get() = conflatedCallbackFlow {
30         val listener =
31             object : OnHeadsUpChangedListener {
32                 override fun onHeadsUpStateChanged(entry: NotificationEntry, isHeadsUp: Boolean) {
33                     trySend(entry to isHeadsUp)
34                 }
35             }
36         addListener(listener)
37         awaitClose { removeListener(listener) }
38     }
39