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.util.IndentingPrintWriter 20 import android.view.ViewGroup 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>null30fun <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 */ indentIfPossiblenull44inline fun PrintWriter.indentIfPossible(block: PrintWriter.() -> Unit) { 45 if (this is IndentingPrintWriter) increaseIndent() 46 block() 47 if (this is IndentingPrintWriter) decreaseIndent() 48 }