1/*
2 * Copyright 2018 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
17package androidx.fragment.app
18
19/**
20 * Run [body] in a [FragmentTransaction] which is automatically committed if it completes without
21 * exception.
22 *
23 * One of four commit functions will be used based on the values of `now` and `allowStateLoss`:
24 *
25 * | `now` | `allowStateLoss` | Method                         |
26 * | ----- | ---------------- | ------------------------------ |
27 * | false | false            | `commit()`                     |
28 * | false | true             | `commitAllowingStateLoss()`    |
29 * | true  | false            | `commitNow()`                  |
30 * | true  | true             | `commitNowAllowingStateLoss()` |
31 */
32inline fun FragmentManager.transaction(
33    now: Boolean = false,
34    allowStateLoss: Boolean = false,
35    body: FragmentTransaction.() -> Unit
36) {
37    val transaction = beginTransaction()
38    transaction.body()
39    if (now) {
40        if (allowStateLoss) {
41            transaction.commitNowAllowingStateLoss()
42        } else {
43            transaction.commitNow()
44        }
45    } else {
46        if (allowStateLoss) {
47            transaction.commitAllowingStateLoss()
48        } else {
49            transaction.commit()
50        }
51    }
52}
53