1 /*
2  * Copyright 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 androidx.compose.foundation.lazy.layout
18 
19 import androidx.compose.runtime.MutableState
20 import androidx.compose.runtime.mutableStateOf
21 import androidx.compose.runtime.neverEqualPolicy
22 import kotlin.jvm.JvmInline
23 
24 /**
25  * Simple wrapper over a mutable state which allows to invalidate an observable scope. We might
26  * consider providing something like this in the public api in the future.
27  */
28 @JvmInline
29 internal value class ObservableScopeInvalidator(
30     private val state: MutableState<Unit> = mutableStateOf(Unit, neverEqualPolicy())
31 ) {
attachToScopenull32     fun attachToScope() {
33         state.value
34     }
35 
invalidateScopenull36     fun invalidateScope() {
37         state.value = Unit
38     }
39 }
40