1 /*
2  * Copyright (C) 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 com.android.systemui.util
18 
19 import android.view.ViewGroup
20 import com.android.internal.util.IndentingPrintWriter
21 import java.io.PrintWriter
22 
23 /** [Sequence] that yields all of the direct children of this [ViewGroup] */
24 val ViewGroup.children
<lambda>null25     get() = sequence {
26         for (i in 0 until childCount) yield(getChildAt(i))
27     }
28 
29 /** Inclusive version of [Iterable.takeWhile] */
<lambda>null30 fun <T> Sequence<T>.takeUntil(pred: (T) -> Boolean): Sequence<T> = sequence {
31     for (x in this@takeUntil) {
32         yield(x)
33         if (pred(x)) {
34             break
35         }
36     }
37 }
38 
39 /**
40  * If `this` is an [IndentingPrintWriter], it will process block inside an indentation level.
41  *
42  * If not, this will just process block.
43  */
indentIfPossiblenull44 inline fun PrintWriter.indentIfPossible(block: PrintWriter.() -> Unit) {
45     if (this is IndentingPrintWriter) increaseIndent()
46     block()
47     if (this is IndentingPrintWriter) decreaseIndent()
48 }