1 /*
2  * Copyright (C) 2021 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.View
21 import java.io.PrintWriter
22 
23 /**
24  * Get an [IndentingPrintWriter] which either is or wraps the given [PrintWriter].
25  *
26  * The original [PrintWriter] should not be used until the returned [IndentingPrintWriter] is no
27  * longer being used, to avoid inconsistent writing.
28  */
29 fun PrintWriter.asIndenting(): IndentingPrintWriter =
30     (this as? IndentingPrintWriter) ?: IndentingPrintWriter(this)
31 
32 /**
33  * Run some code inside a block, with [IndentingPrintWriter.increaseIndent] having been called on
34  * the given argument, and calling [IndentingPrintWriter.decreaseIndent] after completion.
35  */
36 inline fun IndentingPrintWriter.withIncreasedIndent(block: () -> Unit) {
37     this.increaseIndent()
38     try {
39         block()
40     } finally {
41         this.decreaseIndent()
42     }
43 }
44 
45 /**
46  * Run some code inside a block, with [IndentingPrintWriter.increaseIndent] having been called on
47  * the given argument, and calling [IndentingPrintWriter.decreaseIndent] after completion.
48  */
49 fun IndentingPrintWriter.withIncreasedIndent(runnable: Runnable) {
50     this.increaseIndent()
51     try {
52         runnable.run()
53     } finally {
54         this.decreaseIndent()
55     }
56 }
57 
58 /** Print a line which is '$label=$value' */
59 fun IndentingPrintWriter.println(label: String, value: Any) =
60     append(label).append('=').println(value)
61 
62 /** Return a readable string for the visibility */
63 fun visibilityString(@View.Visibility visibility: Int): String = when (visibility) {
64     View.GONE -> "gone"
65     View.VISIBLE -> "visible"
66     View.INVISIBLE -> "invisible"
67     else -> "unknown:$visibility"
68 }
69