1 /*
2  * Copyright 2020 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.ui.node
18 
19 /**
20  * Read observation scopes used in layout and drawing must implement this interface to let the
21  * snapshot observer know when the scope has been removed and should no longer be observed.
22  *
23  * @see OwnerSnapshotObserver.observeReads
24  */
25 internal interface OwnerScope {
26     /**
27      * `true` when the scope is still in the hierarchy and `false` once it has been removed and
28      * observations are no longer necessary.
29      */
30     val isValidOwnerScope: Boolean
31 }
32