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
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 package com.android.healthconnect.controller.shared
17 
18 import androidx.preference.Preference
19 import androidx.preference.PreferenceGroup
20 
21 /** Returns a [MutableIterator] over the preferences in this preference group. */
iteratornull22 operator fun PreferenceGroup.iterator(): Iterator<Preference> =
23     object : MutableIterator<Preference> {
24         private var index = 0
25         override fun hasNext() = index < preferenceCount
26         override fun next() = getPreference(index++)
27         override fun remove() {
28             removePreference(getPreference(--index))
29         }
30     }
31 
32 /** Returns a [Sequence] over the preferences in this preference group. */
33 val PreferenceGroup.children: Sequence<Preference>
34     get() = object : Sequence<Preference> {
iteratornull35         override fun iterator() = this@children.iterator()
36     }