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
18 
19 import com.android.systemui.common.coroutine.ConflatedCallbackFlow.conflatedCallbackFlow
20 import com.android.systemui.plugins.statusbar.StatusBarStateController
21 import kotlinx.coroutines.channels.awaitClose
22 import kotlinx.coroutines.flow.Flow
23 
24 /** Returns a [Flow] that emits whenever [StatusBarStateController.isExpanded] changes value. */
25 val StatusBarStateController.expansionChanges: Flow<Boolean>
<lambda>null26     get() = conflatedCallbackFlow {
27         val listener =
28             object : StatusBarStateController.StateListener {
29                 override fun onExpandedChanged(isExpanded: Boolean) {
30                     trySend(isExpanded)
31                 }
32             }
33         trySend(isExpanded)
34         addCallback(listener)
35         awaitClose { removeCallback(listener) }
36     }
37